+
−/*
+
− * This Source Code Form is subject to the terms of the Mozilla Public
+
− * License, v. 2.0.  If a copy of the MPL was not distributed with this
+
− * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
− *
+
− * Copyright 1997 - July 2008 CWI, August 2008 - 2016 MonetDB B.V.
+
− */
+
−
+
−package nl.cwi.monetdb.jdbc;
+
−
+
−import java.io.File;
+
−import java.io.IOException;
+
−import java.net.SocketException;
+
−import java.net.SocketTimeoutException;
+
−import java.sql.CallableStatement;
+
−import java.sql.Connection;
+
−import java.sql.DatabaseMetaData;
+
−import java.sql.PreparedStatement;
+
−import java.sql.ResultSet;
+
−import java.sql.SQLException;
+
−import java.sql.SQLFeatureNotSupportedException;
+
−import java.sql.SQLWarning;
+
−import java.sql.Savepoint;
+
−import java.sql.Statement;
+
−import java.util.ArrayList;
+
−import java.util.Calendar;
+
−import java.util.HashMap;
+
−import java.util.List;
+
−import java.util.Map;
+
−import java.util.Map.Entry;
+
−import java.util.Properties;
+
−import java.util.WeakHashMap;
+
−import java.util.concurrent.Executor;
+
−import java.util.concurrent.locks.Condition;
+
−import java.util.concurrent.locks.Lock;
+
−import java.util.concurrent.locks.ReentrantLock;
+
−
+
−import nl.cwi.monetdb.jdbc.types.INET;
+
−import nl.cwi.monetdb.jdbc.types.URL;
+
−import nl.cwi.monetdb.mcl.MCLException;
+
−import nl.cwi.monetdb.mcl.io.BufferedMCLReader;
+
−import nl.cwi.monetdb.mcl.io.BufferedMCLWriter;
+
−import nl.cwi.monetdb.mcl.net.MapiSocket;
+
−import nl.cwi.monetdb.mcl.parser.HeaderLineParser;
+
−import nl.cwi.monetdb.mcl.parser.MCLParseException;
+
−import nl.cwi.monetdb.mcl.parser.StartOfHeaderParser;
+
−
+
−/**
+
− * A {@link Connection} suitable for the MonetDB database.
+
− *
+
− * This connection represents a connection (session) to a MonetDB
+
− * database. SQL statements are executed and results are returned within
+
− * the context of a connection. This Connection object holds a physical
+
− * connection to the MonetDB database.
+
− *
+
− * A Connection object's database should able to provide information
+
− * describing its tables, its supported SQL grammar, its stored
+
− * procedures, the capabilities of this connection, and so on. This
+
− * information is obtained with the getMetaData method.
+
− *
+
− * Note: By default a Connection object is in auto-commit mode, which
+
− * means that it automatically commits changes after executing each
+
− * statement. If auto-commit mode has been disabled, the method commit
+
− * must be called explicitly in order to commit changes; otherwise,
+
− * database changes will not be saved.
+
− *
+
− * The current state of this connection is that it nearly implements the
+
− * whole Connection interface.
+
− *
+
− * @author Fabian Groffen
+
− * @author Martin van Dinther
+
− * @version 1.3
+
− */
+
−public class MonetConnection extends MonetWrapper implements Connection {
+
−	/** the successful processed input properties */
+
−	private final Properties conn_props = new Properties();
+
−
+
−	/** The hostname to connect to */
+
−	private final String hostname;
+
−	/** The port to connect on the host to */
+
−	private int port = 0;
+
−	/** The database to use (currently not used) */
+
−	private final String database;
+
−	/** The username to use when authenticating */
+
−	private final String username;
+
−	/** The password to use when authenticating */
+
−	private final String password;
+
−
+
−	/** A connection to mserver5 using a TCP socket */
+
−	private final MapiSocket server;
+
−	/** The Reader from the server */
+
−	private final BufferedMCLReader in;
+
−	/** The Writer to the server */
+
−	private final BufferedMCLWriter out;
+
−
+
−	/** A StartOfHeaderParser  declared for reuse. */
+
−	private StartOfHeaderParser sohp = new StartOfHeaderParser();
+
−
+
−	/** Whether this Connection is closed (and cannot be used anymore) */
+
−	private boolean closed;
+
−
+
−	/** Whether this Connection is in autocommit mode */
+
−	private boolean autoCommit = true;
+
−
+
−	/** The stack of warnings for this Connection object */
+
−	private SQLWarning warnings = null;
+
−	/** The Connection specific mapping of user defined types to Java
+
−	 * types */
+
−	private Map<String,Class<?>> typeMap = new HashMap<String,Class<?>>() {
+
−		private static final long serialVersionUID = 1L;
+
−		{
+
−			put("inet", INET.class);
+
−			put("url",  URL.class);
+
−		}
+
−	};
+
−
+
−	// See javadoc for documentation about WeakHashMap if you don't know what
+
−	// it does !!!NOW!!! (only when you deal with it of course)
+
−	/** A Map containing all (active) Statements created from this Connection */
+
−	private Map<Statement,?> statements = new WeakHashMap<Statement, Object>();
+
−
+
−	/** The number of results we receive from the server at once */
+
−	private int curReplySize = -1;	// the server by default uses -1 (all)
+
−
+
−	/** A template to apply to each query (like pre and post fixes), filled in constructor */
+
−	final String[] queryTempl = new String[3]; // pre, post, sep
+
−
+
−	/** A template to apply to each command (like pre and post fixes), filled in constructor */
+
−	final String[] commandTempl = new String[3]; // pre, post, sep
+
−
+
−	/** the SQL language */
+
−	final static int LANG_SQL = 0;
+
−	/** the MAL language (officially *NOT* supported) */
+
−	final static int LANG_MAL = 3;
+
−	/** an unknown language */
+
−	final static int LANG_UNKNOWN = -1;
+
−	/** The language which is used */
+
−	final int lang;
+
−
+
−	/** Whether or not BLOB is mapped to BINARY within the driver */
+
−	private final boolean blobIsBinary;
+
−
+
−	/**
+
−	 * Constructor of a Connection for MonetDB. At this moment the
+
−	 * current implementation limits itself to storing the given host,
+
−	 * database, username and password for later use by the
+
−	 * createStatement() call.  This constructor is only accessible to
+
−	 * classes from the jdbc package.
+
−	 *
+
−	 * @param props a Property hashtable holding the properties needed for connecting
+
−	 * @throws SQLException if a database error occurs
+
−	 * @throws IllegalArgumentException is one of the arguments is null or empty
+
−	 */
+
−	MonetConnection(Properties props)
+
−		throws SQLException, IllegalArgumentException
+
−	{
+
−		// get supported property values from the props argument.
+
−		// When a value is found add it to the internal conn_props list for use by getClientInfo().
+
−		this.hostname = props.getProperty("host");
+
−		if (this.hostname != null)
+
−			conn_props.setProperty("host", this.hostname);
+
−
+
−		String port_prop = props.getProperty("port");
+
−		if (port_prop != null) {
+
−			try {
+
−				this.port = Integer.parseInt(port_prop);
+
−			} catch (NumberFormatException e) {
+
−				addWarning("Unable to parse port number from: " + port_prop, "M1M05");
+
−			}
+
−			conn_props.setProperty("port", Integer.toString(this.port));
+
−		}
+
−
+
−		this.database = props.getProperty("database");
+
−		if (this.database != null)
+
−			conn_props.setProperty("database", this.database);
+
−
+
−		this.username = props.getProperty("user");
+
−		if (this.username != null)
+
−			conn_props.setProperty("user", this.username);
+
−
+
−		this.password = props.getProperty("password");
+
−		if (this.password != null)
+
−			conn_props.setProperty("password", this.password);
+
−
+
−		String language = props.getProperty("language");
+
−		if (language != null)
+
−			conn_props.setProperty("language", language);
+
−
+
−		boolean debug = false;
+
−		String debug_prop = props.getProperty("debug");
+
−		if (debug_prop != null) {
+
−			debug = Boolean.parseBoolean(debug_prop);
+
−			conn_props.setProperty("debug", Boolean.toString(debug));
+
−		}
+
−
+
−		String hash = props.getProperty("hash");
+
−		if (hash != null)
+
−			conn_props.setProperty("hash", hash);
+
−
+
−		String blobIsBinary_prop = props.getProperty("treat_blob_as_binary");
+
−		if (blobIsBinary_prop != null) {
+
−			blobIsBinary = Boolean.parseBoolean(blobIsBinary_prop);
+
−			conn_props.setProperty("treat_blob_as_binary", Boolean.toString(blobIsBinary));
+
−		} else {
+
−			blobIsBinary = false;
+
−		}
+
−
+
−		int sockTimeout = 0;
+
−		String so_timeout_prop = props.getProperty("so_timeout");
+
−		if (so_timeout_prop != null) {
+
−			try {
+
−				sockTimeout = Integer.parseInt(so_timeout_prop);
+
−				if (sockTimeout < 0) {
+
−					addWarning("Negative socket timeout not allowed. Value ignored", "M1M05");
+
−					sockTimeout = 0;
+
−				}
+
−			} catch (NumberFormatException e) {
+
−				addWarning("Unable to parse socket timeout number from: " + so_timeout_prop, "M1M05");
+
−			}
+
−			conn_props.setProperty("so_timeout", Integer.toString(sockTimeout));
+
−		}
+
−
+
−		// check mandatory input arguments
+
−		if (hostname == null || hostname.isEmpty())
+
−			throw new IllegalArgumentException("Missing or empty host name");
+
−		if (port <= 0)
+
−			throw new IllegalArgumentException("Invalid port number. It should not be " + (port < 0 ? "negative" : "0"));
+
−		if (username == null || username.isEmpty())
+
−			throw new IllegalArgumentException("Missing or empty user name");
+
−		if (password == null || password.isEmpty())
+
−			throw new IllegalArgumentException("Missing or empty password");
+
−		if (language == null || language.isEmpty()) {
+
−			// fallback to default language: sql
+
−			language = "sql";
+
−			addWarning("No language specified, defaulting to 'sql'", "M1M05");
+
−		}
+
−
+
−		server = new MapiSocket();
+
−		if (hash != null)
+
−			server.setHash(hash);
+
−		if (database != null)
+
−			server.setDatabase(database);
+
−		server.setLanguage(language);
+
−
+
−		// we're debugging here... uhm, should be off in real life
+
−		if (debug) {
+
−			try {
+
−				String fname = props.getProperty("logfile", "monet_" +
+
−					System.currentTimeMillis() + ".log");
+
−				File f = new File(fname);
+
−				int ext = fname.lastIndexOf('.');
+
−				if (ext < 0)
+
−					ext = fname.length();
+
−				String pre = fname.substring(0, ext);
+
−				String suf = fname.substring(ext);
+
−
+
−				for (int i = 1; f.exists(); i++) {
+
−					f = new File(pre + "-" + i + suf);
+
−				}
+
−
+
−				server.debug(f.getAbsolutePath());
+
−			} catch (IOException ex) {
+
−				throw new SQLException("Opening logfile failed: " + ex.getMessage(), "08M01");
+
−			}
+
−		}
+
−
+
−		try {
+
−			List<String> warnings = server.connect(hostname, port, username, password);
+
−			for (String warning : warnings) {
+
−				addWarning(warning, "01M02");
+
−			}
+
−
+
−			// apply NetworkTimeout value from legacy (pre 4.1) driver
+
−			// so_timeout calls
+
−			server.setSoTimeout(sockTimeout);
+
−
+
−			in = server.getReader();
+
−			out = server.getWriter();
+
−
+
−			String error = in.waitForPrompt();
+
−			if (error != null)
+
−				throw new SQLException((error.length() > 6) ? error.substring(6) : error, "08001");
+
−		} catch (IOException e) {
+
−			throw new SQLException("Unable to connect (" + hostname + ":" + port + "): " + e.getMessage(), "08006");
+
−		} catch (MCLParseException e) {
+
−			throw new SQLException(e.getMessage(), "08001");
+
−		} catch (MCLException e) {
+
−			String[] connex = e.getMessage().split("\n");
+
−			SQLException sqle = new SQLException(connex[0], "08001", e);
+
−			for (int i = 1; i < connex.length; i++) {
+
−				sqle.setNextException(new SQLException(connex[1], "08001"));
+
−			}
+
−			throw sqle;
+
−		}
+
−
+
−		// we seem to have managed to log in, let's store the
+
−		// language used and language specific query templates
+
−		if ("sql".equals(language)) {
+
−			lang = LANG_SQL;
+
−
+
−			queryTempl[0] = "s";		// pre
+
−			queryTempl[1] = "\n;";		// post
+
−			queryTempl[2] = "\n;\n";	// separator
+
−
+
−			commandTempl[0] = "X";		// pre
+
−			commandTempl[1] = null;		// post
+
−			commandTempl[2] = "\nX";	// separator
+
−		} else if ("mal".equals(language)) {
+
−			lang = LANG_MAL;
+
−
+
−			queryTempl[0] = null;
+
−			queryTempl[1] = ";\n";
+
−			queryTempl[2] = ";\n";
+
−
+
−			commandTempl[0] = null;		// pre
+
−			commandTempl[1] = null;		// post
+
−			commandTempl[2] = null;		// separator
+
−		} else {
+
−			lang = LANG_UNKNOWN;
+
−		}
+
−
+
−		// the following initialisers are only valid when the language is SQL...
+
−		if (lang == LANG_SQL) {
+
−			// enable auto commit
+
−			setAutoCommit(true);
+
−
+
−			// set our time zone on the server
+
−			Calendar cal = Calendar.getInstance();
+
−			int offset = cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET);
+
−			offset /= (60 * 1000); // milliseconds to minutes
+
−			String tz = offset < 0 ? "-" : "+";
+
−			tz += (Math.abs(offset) / 60 < 10 ? "0" : "") + (Math.abs(offset) / 60) + ":";
+
−			offset -= (offset / 60) * 60;
+
−			tz += (offset < 10 ? "0" : "") + offset;
+
−			sendIndependentCommand("SET TIME ZONE INTERVAL '" + tz + "' HOUR TO MINUTE");
+
−		}
+
−
+
−		// we're absolutely not closed, since we're brand new
+
−		closed = false;
+
−	}
+
−
+
−	//== methods of interface Connection
+
−
+
−	/**
+
−	 * Clears all warnings reported for this Connection object. After a
+
−	 * call to this method, the method getWarnings returns null until a
+
−	 * new warning is reported for this Connection object.
+
−	 */
+
−	@Override
+
−	public void clearWarnings() {
+
−		warnings = null;
+
−	}
+
−
+
−	/**
+
−	 * Releases this Connection object's database and JDBC resources
+
−	 * immediately instead of waiting for them to be automatically
+
−	 * released. All Statements created from this Connection will be
+
−	 * closed when this method is called.
+
−	 *
+
−	 * Calling the method close on a Connection object that is already
+
−	 * closed is a no-op.
+
−	 */
+
−	@Override
+
−	public void close() {
+
−		synchronized (server) {
+
−			for (Statement st : statements.keySet()) {
+
−				try {
+
−					st.close();
+
−				} catch (SQLException e) {
+
−					// better luck next time!
+
−				}
+
−			}
+
−			// close the socket
+
−			server.close();
+
−			// close active SendThread if any
+
−			if (sendThread != null) {
+
−				sendThread.shutdown();
+
−				sendThread = null;
+
−			}
+
−			// report ourselves as closed
+
−			closed = true;
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Makes all changes made since the previous commit/rollback
+
−	 * permanent and releases any database locks currently held by this
+
−	 * Connection object.  This method should be used only when
+
−	 * auto-commit mode has been disabled.
+
−	 *
+
−	 * @throws SQLException if a database access error occurs or this
+
−	 *         Connection object is in auto-commit mode
+
−	 * @see #setAutoCommit(boolean)
+
−	 */
+
−	@Override
+
−	public void commit() throws SQLException {
+
−		// note: can't use sendIndependentCommand here because we need
+
−		// to process the auto_commit state the server gives
+
−		sendTransactionCommand("COMMIT");
+
−	}
+
−
+
−	/**
+
−	 * Creates a Statement object for sending SQL statements to the
+
−	 * database.  SQL statements without parameters are normally
+
−	 * executed using Statement objects. If the same SQL statement is
+
−	 * executed many times, it may be more efficient to use a
+
−	 * PreparedStatement object.
+
−	 *
+
−	 * Result sets created using the returned Statement object will by
+
−	 * default be type TYPE_FORWARD_ONLY and have a concurrency level of
+
−	 * CONCUR_READ_ONLY.
+
−	 *
+
−	 * @return a new default Statement object
+
−	 * @throws SQLException if a database access error occurs
+
−	 */
+
−	@Override
+
−	public Statement createStatement() throws SQLException {
+
−		return createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+
−	}
+
−
+
−	/**
+
−	 * Creates a Statement object that will generate ResultSet objects
+
−	 * with the given type and concurrency. This method is the same as
+
−	 * the createStatement method above, but it allows the default
+
−	 * result set type and concurrency to be overridden.
+
−	 *
+
−	 * @param resultSetType a result set type; one of
+
−	 *        ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE,
+
−	 *        or ResultSet.TYPE_SCROLL_SENSITIVE
+
−	 * @param resultSetConcurrency a concurrency type; one of
+
−	 *        ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
+
−	 * @return a new Statement object that will generate ResultSet objects with
+
−	 *         the given type and concurrency
+
−	 * @throws SQLException if a database access error occurs
+
−	 */
+
−	@Override
+
−	public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
+
−		return createStatement(resultSetType, resultSetConcurrency, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+
−	}
+
−
+
−	/**
+
−	 * Creates a Statement object that will generate ResultSet objects
+
−	 * with the given type, concurrency, and holdability.  This method
+
−	 * is the same as the createStatement method above, but it allows
+
−	 * the default result set type, concurrency, and holdability to be
+
−	 * overridden.
+
−	 *
+
−	 * @param resultSetType one of the following ResultSet constants:
+
−	 * ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE,
+
−	 * or ResultSet.TYPE_SCROLL_SENSITIVE
+
−	 * @param resultSetConcurrency one of the following ResultSet
+
−	 * constants: ResultSet.CONCUR_READ_ONLY or
+
−	 * ResultSet.CONCUR_UPDATABLE
+
−	 * @param resultSetHoldability one of the following ResultSet
+
−	 * constants: ResultSet.HOLD_CURSORS_OVER_COMMIT or
+
−	 * ResultSet.CLOSE_CURSORS_AT_COMMIT
+
−	 *
+
−	 * @return a new Statement      object that will generate ResultSet
+
−	 * objects with the given type, concurrency, and holdability
+
−	 * @throws SQLException if a database access error occurs or the
+
−	 * given parameters are not ResultSet constants indicating type,
+
−	 * concurrency, and holdability
+
−	 */
+
−	@Override
+
−	public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
+
−		try {
+
−			Statement ret = new MonetStatement(this, resultSetType, resultSetConcurrency, resultSetHoldability);
+
−			// store it in the map for when we close...
+
−			statements.put(ret, null);
+
−			return ret;
+
−		} catch (IllegalArgumentException e) {
+
−			throw new SQLException(e.toString(), "M0M03");
+
−		}
+
−		// we don't have to catch SQLException because that is declared to
+
−		// be thrown
+
−	}
+
−
+
−	/**
+
−	 * Retrieves the current auto-commit mode for this Connection object.
+
−	 *
+
−	 * @return the current state of this Connection object's auto-commit mode
+
−	 * @see #setAutoCommit(boolean)
+
−	 */
+
−	@Override
+
−	public boolean getAutoCommit() throws SQLException {
+
−		return autoCommit;
+
−	}
+
−
+
−	/**
+
−	 * Retrieves this Connection object's current catalog name.
+
−	 *
+
−	 * @return the current catalog name or null if there is none
+
−	 * @throws SQLException if a database access error occurs or the
+
−	 *         current language is not SQL
+
−	 */
+
−	@Override
+
−	public String getCatalog() throws SQLException {
+
−		// MonetDB does NOT support catalogs
+
−		return null;
+
−	}
+
−
+
−	/**
+
−	 * Retrieves the current holdability of ResultSet objects created
+
−	 * using this Connection object.
+
−	 *
+
−	 * @return the holdability, one of
+
−	 *         ResultSet.HOLD_CURSORS_OVER_COMMIT or
+
−	 *         ResultSet.CLOSE_CURSORS_AT_COMMIT
+
−	 * @see #setHoldability()
+
−	 */
+
−	@Override
+
−	public int getHoldability() {
+
−		// TODO: perhaps it is better to have the server implement
+
−		//       CLOSE_CURSORS_AT_COMMIT
+
−		return ResultSet.HOLD_CURSORS_OVER_COMMIT;
+
−	}
+
−
+
−	/**
+
−	 * Retrieves a DatabaseMetaData object that contains metadata about
+
−	 * the database to which this Connection object represents a
+
−	 * connection. The metadata includes information about the
+
−	 * database's tables, its supported SQL grammar, its stored
+
−	 * procedures, the capabilities of this connection, and so on.
+
−	 *
+
−	 * @throws SQLException if the current language is not SQL
+
−	 * @return a DatabaseMetaData object for this Connection object
+
−	 */
+
−	@Override
+
−	public DatabaseMetaData getMetaData() throws SQLException {
+
−		if (lang != LANG_SQL)
+
−			throw new SQLException("This method is only supported in SQL mode", "M0M04");
+
−
+
−		return new MonetDatabaseMetaData(this);
+
−	}
+
−
+
−	/**
+
−	 * Retrieves this Connection object's current transaction isolation
+
−	 * level.
+
−	 *
+
−	 * @return the current transaction isolation level, which will be
+
−	 *         Connection.TRANSACTION_SERIALIZABLE
+
−	 */
+
−	@Override
+
−	public int getTransactionIsolation() {
+
−		return TRANSACTION_SERIALIZABLE;
+
−	}
+
−
+
−	/**
+
−	 * Retrieves the Map object associated with this Connection object.
+
−	 * Unless the application has added an entry, the type map returned
+
−	 * will be empty.
+
−	 *
+
−	 * @return the java.util.Map object associated with this Connection
+
−	 *         object
+
−	 */
+
−	@Override
+
−	public Map<String,Class<?>> getTypeMap() {
+
−		return typeMap;
+
−	}
+
−
+
−	/**
+
−	 * Retrieves the first warning reported by calls on this Connection
+
−	 * object.  If there is more than one warning, subsequent warnings
+
−	 * will be chained to the first one and can be retrieved by calling
+
−	 * the method SQLWarning.getNextWarning on the warning that was
+
−	 * retrieved previously.
+
−	 *
+
−	 * This method may not be called on a closed connection; doing so
+
−	 * will cause an SQLException to be thrown.
+
−	 *
+
−	 * Note: Subsequent warnings will be chained to this SQLWarning.
+
−	 *
+
−	 * @return the first SQLWarning object or null if there are none
+
−	 * @throws SQLException if a database access error occurs or this method is
+
−	 *         called on a closed connection
+
−	 */
+
−	@Override
+
−	public SQLWarning getWarnings() throws SQLException {
+
−		if (closed)
+
−			throw new SQLException("Cannot call on closed Connection", "M1M20");
+
−
+
−		// if there are no warnings, this will be null, which fits with the
+
−		// specification.
+
−		return warnings;
+
−	}
+
−
+
−	/**
+
−	 * Retrieves whether this Connection object has been closed.  A
+
−	 * connection is closed if the method close has been called on it or
+
−	 * if certain fatal errors have occurred.  This method is guaranteed
+
−	 * to return true only when it is called after the method
+
−	 * Connection.close has been called.
+
−	 *
+
−	 * This method generally cannot be called to determine whether a
+
−	 * connection to a database is valid or invalid.  A typical client
+
−	 * can determine that a connection is invalid by catching any
+
−	 * exceptions that might be thrown when an operation is attempted.
+
−	 *
+
−	 * @return true if this Connection object is closed; false if it is
+
−	 *         still open
+
−	 */
+
−	@Override
+
−	public boolean isClosed() {
+
−		return closed;
+
−	}
+
−
+
−	/**
+
−	 * Retrieves whether this Connection object is in read-only mode.
+
−	 * MonetDB currently doesn't support updateable result sets, but
+
−	 * updates are possible.  Hence the Connection object is never in
+
−	 * read-only mode.
+
−	 *
+
−	 * @return true if this Connection object is read-only; false otherwise
+
−	 */
+
−	@Override
+
−	public boolean isReadOnly() {
+
−		return false;
+
−	}
+
−
+
−	@Override
+
−	public String nativeSQL(String sql) {
+
−		/* there is currently no way to get the native MonetDB rewritten SQL string back, so just return the original string */
+
−		/* in future we may replace/remove the escape sequences { <escape-type> ...} before sending it to the server */
+
−		return sql;
+
−	}
+
−
+
−	@Override
+
−	public CallableStatement prepareCall(String sql) {
+
−		/* not implemented yet */
+
−		return null;
+
−	}
+
−
+
−	@Override
+
−	public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) {
+
−		/* not implemented yet */
+
−		return null;
+
−	}
+
−
+
−	@Override
+
−	public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) {
+
−		/* not implemented yet */
+
−		return null;
+
−	}
+
−
+
−	/**
+
−	 * Creates a PreparedStatement object for sending parameterized SQL
+
−	 * statements to the database.
+
−	 *
+
−	 * A SQL statement with or without IN parameters can be pre-compiled
+
−	 * and stored in a PreparedStatement object. This object can then be
+
−	 * used to efficiently execute this statement multiple times.
+
−	 *
+
−	 * Note: This method is optimized for handling parametric SQL
+
−	 * statements that benefit from precompilation. If the driver
+
−	 * supports precompilation, the method prepareStatement will send
+
−	 * the statement to the database for precompilation. Some drivers
+
−	 * may not support precompilation. In this case, the statement may
+
−	 * not be sent to the database until the PreparedStatement object is
+
−	 * executed. This has no direct effect on users; however, it does
+
−	 * affect which methods throw certain SQLException objects.
+
−	 *
+
−	 * Result sets created using the returned PreparedStatement object
+
−	 * will by default be type TYPE_FORWARD_ONLY and have a concurrency
+
−	 * level of CONCUR_READ_ONLY.
+
−	 *
+
−	 * @param sql an SQL statement that may contain one or more '?' IN
+
−	 *        parameter placeholders
+
−	 * @return a new default PreparedStatement object containing the
+
−	 *         pre-compiled SQL statement
+
−	 * @throws SQLException if a database access error occurs
+
−	 */
+
−	@Override
+
−	public PreparedStatement prepareStatement(String sql) throws SQLException {
+
−		return prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+
−	}
+
−
+
−	/**
+
−	 * Creates a PreparedStatement object that will generate ResultSet
+
−	 * objects with the given type and concurrency.  This method is the
+
−	 * same as the prepareStatement method above, but it allows the
+
−	 * default result set type and concurrency to be overridden.
+
−	 *
+
−	 * @param sql a String object that is the SQL statement to be sent to the
+
−	 *            database; may contain one or more ? IN parameters
+
−	 * @param resultSetType a result set type; one of
+
−	 *        ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE,
+
−	 *        or ResultSet.TYPE_SCROLL_SENSITIVE
+
−	 * @param resultSetConcurrency a concurrency type; one of
+
−	 *        ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
+
−	 * @return a new PreparedStatement object containing the pre-compiled SQL
+
−	 *         statement that will produce ResultSet objects with the given
+
−	 *         type and concurrency
+
−	 * @throws SQLException if a database access error occurs or the given
+
−	 *                      parameters are not ResultSet constants indicating
+
−	 *                      type and concurrency
+
−	 */
+
−	@Override
+
−	public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
+
−		return prepareStatement(sql, resultSetType, resultSetConcurrency, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+
−	}
+
−
+
−	/**
+
−	 * Creates a PreparedStatement object that will generate ResultSet
+
−	 * objects with the given type, concurrency, and holdability.
+
−	 *
+
−	 * This method is the same as the prepareStatement method above, but
+
−	 * it allows the default result set type, concurrency, and
+
−	 * holdability to be overridden.
+
−	 *
+
−	 * @param sql a String object that is the SQL statement to be sent
+
−	 * to the database; may contain one or more ? IN parameters
+
−	 * @param resultSetType one of the following ResultSet constants:
+
−	 * ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE,
+
−	 * or ResultSet.TYPE_SCROLL_SENSITIVE
+
−	 * @param resultSetConcurrency one of the following ResultSet
+
−	 * constants: ResultSet.CONCUR_READ_ONLY or
+
−	 * ResultSet.CONCUR_UPDATABLE
+
−	 * @param resultSetHoldability one of the following ResultSet
+
−	 * constants: ResultSet.HOLD_CURSORS_OVER_COMMIT or
+
−	 * ResultSet.CLOSE_CURSORS_AT_COMMIT
+
−	 * @return a new PreparedStatement object, containing the
+
−	 * pre-compiled SQL statement, that will generate ResultSet objects
+
−	 * with the given type, concurrency, and holdability
+
−	 * @throws SQLException if a database access error occurs or the
+
−	 * given parameters are not ResultSet constants indicating type,
+
−	 * concurrency, and holdability
+
−	 */
+
−	@Override
+
−	public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
+
−		throws SQLException
+
−	{
+
−		try {
+
−			PreparedStatement ret = new MonetPreparedStatement(
+
−				this,
+
−				resultSetType,
+
−				resultSetConcurrency,
+
−				resultSetHoldability,
+
−				sql
+
−			);
+
−			// store it in the map for when we close...
+
−			statements.put(ret, null);
+
−			return ret;
+
−		} catch (IllegalArgumentException e) {
+
−			throw new SQLException(e.toString(), "M0M03");
+
−		}
+
−		// we don't have to catch SQLException because that is declared to
+
−		// be thrown
+
−	}
+
−
+
−	/**
+
−	 * Creates a default PreparedStatement object that has the
+
−	 * capability to retrieve auto-generated keys.  The given constant
+
−	 * tells the driver whether it should make auto-generated keys
+
−	 * available for retrieval.  This parameter is ignored if the SQL
+
−	 * statement is not an INSERT statement.
+
−	 *
+
−	 * Note: This method is optimized for handling parametric SQL
+
−	 * statements that benefit from precompilation.  If the driver
+
−	 * supports precompilation, the method prepareStatement will send
+
−	 * the statement to the database for precompilation. Some drivers
+
−	 * may not support precompilation.  In this case, the statement may
+
−	 * not be sent to the database until the PreparedStatement object is
+
−	 * executed.  This has no direct effect on users; however, it does
+
−	 * affect which methods throw certain SQLExceptions.
+
−	 *
+
−	 * Result sets created using the returned PreparedStatement object
+
−	 * will by default be type TYPE_FORWARD_ONLY and have a concurrency
+
−	 * level of CONCUR_READ_ONLY.
+
−	 *
+
−	 * @param sql an SQL statement that may contain one or more '?' IN
+
−	 *        parameter placeholders
+
−	 * @param autoGeneratedKeys a flag indicating whether auto-generated
+
−	 *        keys should be returned; one of
+
−	 *        Statement.RETURN_GENERATED_KEYS or
+
−	 *        Statement.NO_GENERATED_KEYS
+
−	 * @return a new PreparedStatement object, containing the
+
−	 *         pre-compiled SQL statement, that will have the capability
+
−	 *         of returning auto-generated keys
+
−	 * @throws SQLException - if a database access error occurs or the
+
−	 *         given parameter is not a Statement  constant indicating
+
−	 *         whether auto-generated keys should be returned
+
−	 */
+
−	@Override
+
−	public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
+
−		if (autoGeneratedKeys != Statement.RETURN_GENERATED_KEYS &&
+
−			autoGeneratedKeys != Statement.NO_GENERATED_KEYS)
+
−			throw new SQLException("Invalid argument, expected RETURN_GENERATED_KEYS or NO_GENERATED_KEYS", "M1M05");
+
−
+
−		/* MonetDB has no way to disable this, so just do the normal
+
−		 * thing ;) */
+
−		return prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
+
−	}
+
−
+
−	/**
+
−	 * Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array.
+
−	 * This array contains the indexes of the columns in the target table that contain the auto-generated keys that should be made available.
+
−	 * The driver will ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to
+
−	 * return auto-generated keys (the list of such statements is vendor-specific).
+
−	 *
+
−	 * An SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object.
+
−	 * This object can then be used to efficiently execute this statement multiple times.
+
−	 *
+
−	 * Note: This method is optimized for handling parametric SQL statements that benefit from precompilation.
+
−	 * If the driver supports precompilation, the method prepareStatement will send the statement to the database for precompilation.
+
−	 * Some drivers may not support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement
+
−	 * object is executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions.
+
−	 *
+
−	 * Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have
+
−	 * a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling getHoldability().
+
−	 *
+
−	 * Parameters:
+
−	 *     sql - an SQL statement that may contain one or more '?' IN parameter placeholders
+
−	 *     columnIndexes - an array of column indexes indicating the columns that should be returned from the inserted row or rows
+
−	 * Returns:
+
−	 *     a new PreparedStatement object, containing the pre-compiled statement, that is capable of
+
−	 *     returning the auto-generated keys designated by the given array of column indexes
+
−	 * Throws:
+
−	 *     SQLException - if a database access error occurs or this method is called on a closed connection
+
−	 *     SQLFeatureNotSupportedException - if the JDBC driver does not support this method
+
−	 */
+
−	@Override
+
−	public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
+
−		throw new SQLFeatureNotSupportedException("prepareStatement(String sql, int[] columnIndexes) not supported", "0A000");
+
−	}
+
−
+
−	/**
+
−	 * Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array.
+
−	 * This array contains the names of the columns in the target table that contain the auto-generated keys that should be returned.
+
−	 * The driver will ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to
+
−	 * return auto-generated keys (the list of such statements is vendor-specific).
+
−	 *
+
−	 * An SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object.
+
−	 * This object can then be used to efficiently execute this statement multiple times.
+
−	 *
+
−	 * Note: This method is optimized for handling parametric SQL statements that benefit from precompilation.
+
−	 * If the driver supports precompilation, the method prepareStatement will send the statement to the database for precompilation.
+
−	 * Some drivers may not support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement
+
−	 * object is executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions.
+
−	 *
+
−	 * Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have
+
−	 * a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling getHoldability().
+
−	 *
+
−	 * Parameters:
+
−	 *     sql - an SQL statement that may contain one or more '?' IN parameter placeholders
+
−	 *     columnNames - an array of column names indicating the columns that should be returned from the inserted row or rows
+
−	 * Returns:
+
−	 *     a new PreparedStatement object, containing the pre-compiled statement, that is capable of
+
−	 *     returning the auto-generated keys designated by the given array of column names
+
−	 * Throws:
+
−	 *     SQLException - if a database access error occurs or this method is called on a closed connection
+
−	 *     SQLFeatureNotSupportedException - if the JDBC driver does not support this method
+
−	 */
+
−	@Override
+
−	public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
+
−		throw new SQLFeatureNotSupportedException("prepareStatement(String sql, String[] columnNames) not supported", "0A000");
+
−	}
+
−
+
−	/**
+
−	 * Removes the given Savepoint object from the current transaction.
+
−	 * Any reference to the savepoint after it have been removed will
+
−	 * cause an SQLException to be thrown.
+
−	 *
+
−	 * @param savepoint the Savepoint object to be removed
+
−	 * @throws SQLException if a database access error occurs or the given
+
−	 *         Savepoint object is not a valid savepoint in the current
+
−	 *         transaction
+
−	 */
+
−	@Override
+
−	public void releaseSavepoint(Savepoint savepoint) throws SQLException {
+
−		if (!(savepoint instanceof MonetSavepoint))
+
−			throw new SQLException("This driver can only handle savepoints it created itself", "M0M06");
+
−
+
−		MonetSavepoint sp = (MonetSavepoint)savepoint;
+
−
+
−		// note: can't use sendIndependentCommand here because we need
+
−		// to process the auto_commit state the server gives
+
−		sendTransactionCommand("RELEASE SAVEPOINT " + sp.getName());
+
−	}
+
−
+
−	/**
+
−	 * Undoes all changes made in the current transaction and releases
+
−	 * any database locks currently held by this Connection object.
+
−	 * This method should be used only when auto-commit mode has been disabled.
+
−	 *
+
−	 * @throws SQLException if a database access error occurs or this
+
−	 *         Connection object is in auto-commit mode
+
−	 * @see #setAutoCommit(boolean)
+
−	 */
+
−	@Override
+
−	public void rollback() throws SQLException {
+
−		// note: can't use sendIndependentCommand here because we need
+
−		// to process the auto_commit state the server gives
+
−		sendTransactionCommand("ROLLBACK");
+
−	}
+
−
+
−	/**
+
−	 * Undoes all changes made after the given Savepoint object was set.
+
−	 *
+
−	 * This method should be used only when auto-commit has been disabled.
+
−	 *
+
−	 * @param savepoint the Savepoint object to roll back to
+
−	 * @throws SQLException if a database access error occurs, the
+
−	 *         Savepoint object is no longer valid, or this Connection
+
−	 *         object is currently in auto-commit mode
+
−	 */
+
−	@Override
+
−	public void rollback(Savepoint savepoint) throws SQLException {
+
−		if (!(savepoint instanceof MonetSavepoint))
+
−			throw new SQLException("This driver can only handle savepoints it created itself", "M0M06");
+
−
+
−		MonetSavepoint sp = (MonetSavepoint)savepoint;
+
−
+
−		// note: can't use sendIndependentCommand here because we need
+
−		// to process the auto_commit state the server gives
+
−		sendTransactionCommand("ROLLBACK TO SAVEPOINT " + sp.getName());
+
−	}
+
−
+
−	/**
+
−	 * Sets this connection's auto-commit mode to the given state. If a
+
−	 * connection is in auto-commit mode, then all its SQL statements
+
−	 * will be executed and committed as individual transactions.
+
−	 * Otherwise, its SQL statements are grouped into transactions that
+
−	 * are terminated by a call to either the method commit or the
+
−	 * method rollback. By default, new connections are in auto-commit mode.
+
−	 *
+
−	 * The commit occurs when the statement completes or the next
+
−	 * execute occurs, whichever comes first. In the case of statements
+
−	 * returning a ResultSet object, the statement completes when the
+
−	 * last row of the ResultSet object has been retrieved or the
+
−	 * ResultSet object has been closed. In advanced cases, a single
+
−	 * statement may return multiple results as well as output parameter
+
−	 * values. In these cases, the commit occurs when all results and
+
−	 * output parameter values have been retrieved.
+
−	 *
+
−	 * NOTE: If this method is called during a transaction, the
+
−	 * transaction is committed.
+
−	 *
+
−	 * @param autoCommit true to enable auto-commit mode; false to disable it
+
−	 * @throws SQLException if a database access error occurs
+
−	 * @see #getAutoCommit()
+
−	 */
+
−	@Override
+
−	public void setAutoCommit(boolean autoCommit) throws SQLException {
+
−		if (this.autoCommit != autoCommit) {
+
−			sendControlCommand("auto_commit " + (autoCommit ? "1" : "0"));
+
−			this.autoCommit = autoCommit;
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Sets the given catalog name in order to select a subspace of this
+
−	 * Connection object's database in which to work.  If the driver
+
−	 * does not support catalogs, it will silently ignore this request.
+
−	 */
+
−	@Override
+
−	public void setCatalog(String catalog) throws SQLException {
+
−		// silently ignore this request as MonetDB does not support catalogs
+
−	}
+
−
+
−	/**
+
−	 * Changes the default holdability of ResultSet objects created using this
+
−	 * Connection object to the given holdability. The default holdability of
+
−	 * ResultSet objects can be be determined by invoking DatabaseMetaData.getResultSetHoldability().
+
−	 *
+
−	 * @param holdability - a ResultSet holdability constant; one of
+
−	 *	ResultSet.HOLD_CURSORS_OVER_COMMIT or
+
−	 *	ResultSet.CLOSE_CURSORS_AT_COMMIT
+
−	 * @see #getHoldability()
+
−	 */
+
−	@Override
+
−	public void setHoldability(int holdability) throws SQLException {
+
−		// we only support ResultSet.HOLD_CURSORS_OVER_COMMIT
+
−		if (holdability != ResultSet.HOLD_CURSORS_OVER_COMMIT)
+
−			throw new SQLFeatureNotSupportedException("setHoldability(CLOSE_CURSORS_AT_COMMIT) not supported", "0A000");
+
−	}
+
−
+
−	/**
+
−	 * Puts this connection in read-only mode as a hint to the driver to
+
−	 * enable database optimizations.  MonetDB doesn't support any mode
+
−	 * here, hence an SQLWarning is generated if attempted to set
+
−	 * to true here.
+
−	 *
+
−	 * @param readOnly true enables read-only mode; false disables it
+
−	 * @throws SQLException if a database access error occurs or this
+
−	 *         method is called during a transaction.
+
−	 */
+
−	@Override
+
−	public void setReadOnly(boolean readOnly) throws SQLException {
+
−		if (readOnly == true)
+
−			addWarning("cannot setReadOnly(true): read-only Connection mode not supported", "01M08");
+
−	}
+
−
+
−	/**
+
−	 * Creates an unnamed savepoint in the current transaction and
+
−	 * returns the new Savepoint object that represents it.
+
−	 *
+
−	 * @return the new Savepoint object
+
−	 * @throws SQLException if a database access error occurs or this Connection
+
−	 *         object is currently in auto-commit mode
+
−	 */
+
−	@Override
+
−	public Savepoint setSavepoint() throws SQLException {
+
−		// create a new Savepoint object
+
−		MonetSavepoint sp = new MonetSavepoint();
+
−
+
−		// note: can't use sendIndependentCommand here because we need
+
−		// to process the auto_commit state the server gives
+
−		sendTransactionCommand("SAVEPOINT " + sp.getName());
+
−		return sp;
+
−	}
+
−
+
−	/**
+
−	 * Creates a savepoint with the given name in the current transaction
+
−	 * and returns the new Savepoint object that represents it.
+
−	 *
+
−	 * @param name a String containing the name of the savepoint
+
−	 * @return the new Savepoint object
+
−	 * @throws SQLException if a database access error occurs or this Connection
+
−	 *         object is currently in auto-commit mode
+
−	 */
+
−	@Override
+
−	public Savepoint setSavepoint(String name) throws SQLException {
+
−		// create a new Savepoint object
+
−		MonetSavepoint sp;
+
−		try {
+
−			sp = new MonetSavepoint(name);
+
−		} catch (IllegalArgumentException e) {
+
−			throw new SQLException(e.getMessage(), "M0M03");
+
−		}
+
−
+
−		// note: can't use sendIndependentCommand here because we need
+
−		// to process the auto_commit state the server gives
+
−		sendTransactionCommand("SAVEPOINT " + sp.getName());
+
−		return sp;
+
−	}
+
−
+
−	/**
+
−	 * Attempts to change the transaction isolation level for this
+
−	 * Connection object to the one given.  The constants defined in the
+
−	 * interface Connection are the possible transaction isolation levels.
+
−	 *
+
−	 * @param level one of the following Connection constants:
+
−	 *        Connection.TRANSACTION_READ_UNCOMMITTED,
+
−	 *        Connection.TRANSACTION_READ_COMMITTED,
+
−	 *        Connection.TRANSACTION_REPEATABLE_READ, or
+
−	 *        Connection.TRANSACTION_SERIALIZABLE.
+
−	 */
+
−	@Override
+
−	public void setTransactionIsolation(int level) {
+
−		if (level != TRANSACTION_SERIALIZABLE) {
+
−			addWarning("MonetDB only supports fully serializable " +
+
−				"transactions, continuing with transaction level " +
+
−				"raised to TRANSACTION_SERIALIZABLE", "01M09");
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Installs the given TypeMap object as the type map for this
+
−	 * Connection object. The type map will be used for the custom
+
−	 * mapping of SQL structured types and distinct types.
+
−	 *
+
−	 * @param map the java.util.Map object to install as the replacement for
+
−	 *        this Connection  object's default type map
+
−	 */
+
−	@Override
+
−	public void setTypeMap(Map<String, Class<?>> map) {
+
−		typeMap = map;
+
−	}
+
−
+
−	/**
+
−	 * Returns a string identifying this Connection to the MonetDB server.
+
−	 *
+
−	 * @return a String representing this Object
+
−	 */
+
−	@Override
+
−	public String toString() {
+
−		return "MonetDB Connection (" + getJDBCURL() + ") " +
+
−				(closed ? "connected" : "disconnected");
+
−	}
+
−
+
−	//== Java 1.6 methods (JDBC 4.0)
+
−
+
−	/**
+
−	 * Factory method for creating Array objects.
+
−	 *
+
−	 * Note: When createArrayOf is used to create an array object that
+
−	 * maps to a primitive data type, then it is implementation-defined
+
−	 * whether the Array object is an array of that primitive data type
+
−	 * or an array of Object.
+
−	 *
+
−	 * Note: The JDBC driver is responsible for mapping the elements
+
−	 * Object array to the default JDBC SQL type defined in
+
−	 * java.sql.Types for the given class of Object. The default mapping
+
−	 * is specified in Appendix B of the JDBC specification. If the
+
−	 * resulting JDBC type is not the appropriate type for the given
+
−	 * typeName then it is implementation defined whether an
+
−	 * SQLException is thrown or the driver supports the resulting conversion.
+
−	 *
+
−	 * @param typeName the SQL name of the type the elements of the
+
−	 *        array map to. The typeName is a database-specific name
+
−	 *        which may be the name of a built-in type, a user-defined
+
−	 *        type or a standard SQL type supported by this database.
+
−	 *        This is the value returned by Array.getBaseTypeName
+
−	 * @return an Array object whose elements map to the specified SQL type
+
−	 * @throws SQLException if a database error occurs, the JDBC type
+
−	 *         is not appropriate for the typeName and the conversion is
+
−	 *         not supported, the typeName is null or this method is
+
−	 *         called on a closed connection
+
−	 * @throws SQLFeatureNotSupportedException the JDBC driver does
+
−	 *         not support this data type
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public java.sql.Array createArrayOf(String typeName, Object[] elements) throws SQLException {
+
−		throw new SQLFeatureNotSupportedException("createArrayOf() not supported", "0A000");
+
−	}
+
−
+
−
+
−	/**
+
−	 * Constructs an object that implements the Clob interface. The
+
−	 * object returned initially contains no data. The setAsciiStream,
+
−	 * setCharacterStream and setString methods of the Clob interface
+
−	 * may be used to add data to the Clob.
+
−	 *
+
−	 * @return a MonetClob instance
+
−	 * @throws SQLFeatureNotSupportedException the JDBC driver does
+
−	 *         not support MonetClob objects that can be filled in
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public java.sql.Clob createClob() throws SQLException {
+
−		return new MonetClob("");
+
−	}
+
−
+
−	/**
+
−	 * Constructs an object that implements the Blob interface. The
+
−	 * object returned initially contains no data. The setBinaryStream
+
−	 * and setBytes methods of the Blob interface may be used to add
+
−	 * data to the Blob.
+
−	 *
+
−	 * @return a MonetBlob instance
+
−	 * @throws SQLFeatureNotSupportedException the JDBC driver does
+
−	 *         not support MonetBlob objects that can be filled in
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public java.sql.Blob createBlob() throws SQLException {
+
−		byte[] buf = new byte[1];
+
−		return new MonetBlob(buf);
+
−	}
+
−
+
−	/**
+
−	 * Constructs an object that implements the NClob interface. The
+
−	 * object returned initially contains no data. The setAsciiStream,
+
−	 * setCharacterStream and setString methods of the NClob interface
+
−	 * may be used to add data to the NClob.
+
−	 *
+
−	 * @return an NClob instance
+
−	 * @throws SQLFeatureNotSupportedException the JDBC driver does
+
−	 *         not support MonetNClob objects that can be filled in
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public java.sql.NClob createNClob() throws SQLException {
+
−		throw new SQLFeatureNotSupportedException("createNClob() not supported", "0A000");
+
−	}
+
−
+
−	/**
+
−	 * Factory method for creating Struct objects.
+
−	 *
+
−	 * @param typeName the SQL type name of the SQL structured type that
+
−	 *        this Struct object maps to. The typeName is the name of a
+
−	 *        user-defined type that has been defined for this database.
+
−	 *        It is the value returned by Struct.getSQLTypeName.
+
−	 * @param attributes the attributes that populate the returned object
+
−	 * @return a Struct object that maps to the given SQL type and is
+
−	 *         populated with the given attributes
+
−	 * @throws SQLException if a database error occurs, the typeName
+
−	 *         is null or this method is called on a closed connection
+
−	 * @throws SQLFeatureNotSupportedException the JDBC driver does
+
−	 *         not support this data type
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public java.sql.Struct createStruct(String typeName, Object[] attributes) throws SQLException {
+
−		throw new SQLFeatureNotSupportedException("createStruct() not supported", "0A000");
+
−	}
+
−
+
−	/**
+
−	 * Constructs an object that implements the SQLXML interface. The
+
−	 * object returned initially contains no data. The
+
−	 * createXmlStreamWriter object and setString method of the SQLXML
+
−	 * interface may be used to add data to the SQLXML object.
+
−	 *
+
−	 * @return An object that implements the SQLXML interface
+
−	 * @throws SQLFeatureNotSupportedException the JDBC driver does
+
−	 *         not support this data type
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public java.sql.SQLXML createSQLXML() throws SQLException {
+
−		throw new SQLFeatureNotSupportedException("createSQLXML() not supported", "0A000");
+
−	}
+
−
+
−	/**
+
−	 * Returns true if the connection has not been closed and is still
+
−	 * valid. The driver shall submit a query on the connection or use
+
−	 * some other mechanism that positively verifies the connection is
+
−	 * still valid when this method is called.
+
−	 *
+
−	 * The query submitted by the driver to validate the connection
+
−	 * shall be executed in the context of the current transaction.
+
−	 *
+
−	 * @param timeout The time in seconds to wait for the database
+
−	 *        operation used to validate the connection to complete. If
+
−	 *        the timeout period expires before the operation completes,
+
−	 *        this method returns false. A value of 0 indicates a
+
−	 *        timeout is not applied to the database operation.
+
−	 * @return true if the connection is valid, false otherwise
+
−	 * @throws SQLException if the value supplied for timeout is less than 0
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public boolean isValid(int timeout) throws SQLException {
+
−		if (timeout < 0)
+
−			throw new SQLException("timeout is less than 0", "M1M05");
+
−		if (closed)
+
−			return false;
+
−
+
−		// ping db using query: select 1;
+
−		Statement stmt = null;
+
−		ResultSet rs = null;
+
−		try {
+
−			stmt = createStatement();
+
−			stmt.setQueryTimeout(timeout);
+
−			rs = stmt.executeQuery("SELECT 1");
+
−			rs.close();
+
−			rs = null;
+
−			stmt.close();
+
−			return true;
+
−		} catch (Exception e) {
+
−			if (rs != null) {
+
−				try {
+
−					rs.close();
+
−				} catch (Exception e2) {}
+
−			}
+
−			if (stmt != null) {
+
−				try {
+
−					stmt.close();
+
−				} catch (Exception e2) {}
+
−			}
+
−		}
+
−		return false;
+
−	}
+
−
+
−	/**
+
−	 * Returns the value of the client info property specified by name.
+
−	 * This method may return null if the specified client info property
+
−	 * has not been set and does not have a default value.
+
−	 * This method will also return null if the specified client info
+
−	 * property name is not supported by the driver.
+
−	 * Applications may use the DatabaseMetaData.getClientInfoProperties method
+
−	 * to determine the client info properties supported by the driver.
+
−	 *
+
−	 * @param name - The name of the client info property to retrieve
+
−	 * @return The value of the client info property specified or null
+
−	 * @throws SQLException - if the database server returns an error
+
−	 *	when fetching the client info value from the database
+
−	 *	or this method is called on a closed connection
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public String getClientInfo(String name) throws SQLException {
+
−		if (name == null || name.isEmpty())
+
−			return null;
+
−		return conn_props.getProperty(name);
+
−	}
+
−
+
−	/**
+
−	 * Returns a list containing the name and current value of each client info
+
−	 * property supported by the driver. The value of a client info property may
+
−	 * be null if the property has not been set and does not have a default value.
+
−	 *
+
−	 * @return A Properties object that contains the name and current value
+
−	 *         of each of the client info properties supported by the driver.
+
−	 * @throws SQLException - if the database server returns an error
+
−	 *	when fetching the client info value from the database
+
−	 *	or this method is called on a closed connection
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public Properties getClientInfo() throws SQLException {
+
−		// return a clone of the connection properties object
+
−		return new Properties(conn_props);
+
−	}
+
−
+
−	/**
+
−	 * Sets the value of the client info property specified by name to the value specified by value.
+
−	 * Applications may use the DatabaseMetaData.getClientInfoProperties method to determine
+
−	 * the client info properties supported by the driver and the maximum length that may be specified
+
−	 * for each property.
+
−	 *
+
−	 * The driver stores the value specified in a suitable location in the database. For example
+
−	 * in a special register, session parameter, or system table column. For efficiency the driver
+
−	 * may defer setting the value in the database until the next time a statement is executed
+
−	 * or prepared. Other than storing the client information in the appropriate place in the
+
−	 * database, these methods shall not alter the behavior of the connection in anyway.
+
−	 * The values supplied to these methods are used for accounting, diagnostics and debugging purposes only.
+
−	 *
+
−	 * The driver shall generate a warning if the client info name specified is not recognized by the driver.
+
−	 *
+
−	 * If the value specified to this method is greater than the maximum length for the property
+
−	 * the driver may either truncate the value and generate a warning or generate a SQLClientInfoException.
+
−	 * If the driver generates a SQLClientInfoException, the value specified was not set on the connection.
+
−	 *
+
−	 * The following are standard client info properties. Drivers are not required to support these
+
−	 * properties however if the driver supports a client info property that can be described by one
+
−	 * of the standard properties, the standard property name should be used.
+
−	 *
+
−	 *	ApplicationName - The name of the application currently utilizing the connection
+
−	 *	ClientUser - The name of the user that the application using the connection is performing work for.
+
−	 *		This may not be the same as the user name that was used in establishing the connection.
+
−	 *	ClientHostname - The hostname of the computer the application using the connection is running on.
+
−	 *
+
−	 * @param name - The name of the client info property to set
+
−	 * @param value - The value to set the client info property to. If the
+
−	 *        value is null, the current value of the specified property is cleared.
+
−	 * @throws SQLClientInfoException - if the database server returns an error
+
−	 *         while setting the clientInfo values on the database server
+
−	 *         or this method is called on a closed connection
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public void setClientInfo(String name, String value) throws java.sql.SQLClientInfoException {
+
−		if (name == null || name.isEmpty()) {
+
−			addWarning("setClientInfo: missing property name", "01M07");
+
−			return;
+
−		}
+
−		// If the value is null, the current value of the specified property is cleared.
+
−		if (value == null) {
+
−			if (conn_props.containsKey(name))
+
−				conn_props.remove(name);
+
−			return;
+
−		}
+
−		// only set value for supported property names
+
−		if (name.equals("host") ||
+
−		    name.equals("port") ||
+
−		    name.equals("user") ||
+
−		    name.equals("password") ||
+
−		    name.equals("database") ||
+
−		    name.equals("language") ||
+
−		    name.equals("so_timeout") ||
+
−		    name.equals("debug") ||
+
−		    name.equals("hash") ||
+
−		    name.equals("treat_blob_as_binary")) {
+
−			conn_props.setProperty(name, value);
+
−		} else {
+
−			addWarning("setClientInfo: " + name + "is not a recognised property", "01M07");
+
−		}
+
−		return;
+
−	}
+
−
+
−	/**
+
−	 * Sets the value of the connection's client info properties.
+
−	 * The Properties object contains the names and values of the client info
+
−	 * properties to be set. The set of client info properties contained in the
+
−	 * properties list replaces the current set of client info properties on the connection.
+
−	 * If a property that is currently set on the connection is not present in the
+
−	 * properties list, that property is cleared. Specifying an empty properties list
+
−	 * will clear all of the properties on the connection.
+
−	 * See setClientInfo (String, String) for more information.
+
−	 *
+
−	 * If an error occurs in setting any of the client info properties, a
+
−	 * SQLClientInfoException is thrown. The SQLClientInfoException contains information
+
−	 * indicating which client info properties were not set. The state of the client
+
−	 * information is unknown because some databases do not allow multiple client info
+
−	 * properties to be set atomically. For those databases, one or more properties may
+
−	 * have been set before the error occurred.
+
−	 *
+
−	 * @param props - The list of client info properties to set
+
−	 * @throws SQLClientInfoException - if the database server returns an error
+
−	 *	while setting the clientInfo values on the database server
+
−	 *	or this method is called on a closed connection
+
−	 * @since 1.6
+
−	 */
+
−	@Override
+
−	public void setClientInfo(Properties props) throws java.sql.SQLClientInfoException {
+
−		if (props != null) {
+
−			for (Entry<Object, Object> entry : props.entrySet()) {
+
−				setClientInfo(entry.getKey().toString(),
+
−						entry.getValue().toString());
+
−			}
+
−		}
+
−	}
+
−
+
−
+
−	//== Java 1.7 methods (JDBC 4.1)
+
−
+
−	/**
+
−	 * Sets the given schema name to access.
+
−	 *
+
−	 * @param schema the name of a schema in which to work
+
−	 * @throws SQLException if a database access error occurs or this
+
−	 *         method is called on a closed connection
+
−	 * @since 1.7
+
−	 */
+
−	@Override
+
−	public void setSchema(String schema) throws SQLException {
+
−		if (closed)
+
−			throw new SQLException("Cannot call on closed Connection", "M1M20");
+
−		if (schema == null)
+
−			throw new SQLException("Missing schema name", "M1M05");
+
−
+
−		Statement st = createStatement();
+
−		try {
+
−			st.execute("SET SCHEMA \"" + schema + "\"");
+
−		} finally {
+
−			st.close();
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Retrieves this Connection object's current schema name.
+
−	 *
+
−	 * @return the current schema name or null if there is none
+
−	 * @throws SQLException if a database access error occurs or this
+
−	 *         method is called on a closed connection
+
−	 * @since 1.7
+
−	 */
+
−	@Override
+
−	public String getSchema() throws SQLException {
+
−		if (closed)
+
−			throw new SQLException("Cannot call on closed Connection", "M1M20");
+
−
+
−		String cur_schema;
+
−		Statement st = createStatement();
+
−		ResultSet rs = null;
+
−		try {
+
−			rs = st.executeQuery("SELECT CURRENT_SCHEMA");
+
−			if (!rs.next())
+
−				throw new SQLException("Row expected", "02000");
+
−			cur_schema = rs.getString(1);
+
−		} finally {
+
−			if (rs != null)
+
−				rs.close();
+
−			st.close();
+
−		}
+
−		return cur_schema;
+
−	}
+
−
+
−	/**
+
−	 * Terminates an open connection. Calling abort results in:
+
−	 *  * The connection marked as closed
+
−	 *  * Closes any physical connection to the database
+
−	 *  * Releases resources used by the connection
+
−	 *  * Insures that any thread that is currently accessing the
+
−	 *    connection will either progress to completion or throw an
+
−	 *    SQLException.
+
−	 * Calling abort marks the connection closed and releases any
+
−	 * resources. Calling abort on a closed connection is a no-op.
+
−	 *
+
−	 * @param executor The Executor implementation which will be used by
+
−	 *        abort
+
−	 * @throws SQLException if a database access error occurs or the
+
−	 *         executor is null
+
−	 * @throws SecurityException if a security manager exists and
+
−	 *         its checkPermission method denies calling abort
+
−	 * @since 1.7
+
−	 */
+
−	@Override
+
−	public void abort(Executor executor) throws SQLException {
+
−		if (closed)
+
−			return;
+
−		if (executor == null)
+
−			throw new SQLException("executor is null", "M1M05");
+
−		// this is really the simplest thing to do, it destroys
+
−		// everything (in particular the server connection)
+
−		close();
+
−	}
+
−
+
−	/**
+
−	 * Sets the maximum period a Connection or objects created from the
+
−	 * Connection will wait for the database to reply to any one
+
−	 * request. If any request remains unanswered, the waiting method
+
−	 * will return with a SQLException, and the Connection or objects
+
−	 * created from the Connection will be marked as closed. Any
+
−	 * subsequent use of the objects, with the exception of the close,
+
−	 * isClosed or Connection.isValid methods, will result in a
+
−	 * SQLException.
+
−	 *
+
−	 * @param executor The Executor implementation which will be used by
+
−	 *        setNetworkTimeout
+
−	 * @param millis The time in milliseconds to wait for the
+
−	 *        database operation to complete
+
−	 * @throws SQLException if a database access error occurs, this
+
−	 *         method is called on a closed connection, the executor is
+
−	 *         null, or the value specified for seconds is less than 0.
+
−	 * @since 1.7
+
−	 */
+
−	@Override
+
−	public void setNetworkTimeout(Executor executor, int millis) throws SQLException {
+
−		if (closed)
+
−			throw new SQLException("Cannot call on closed Connection", "M1M20");
+
−		if (executor == null)
+
−			throw new SQLException("executor is null", "M1M05");
+
−		if (millis < 0)
+
−			throw new SQLException("milliseconds is less than zero", "M1M05");
+
−
+
−		try {
+
−			server.setSoTimeout(millis);
+
−		} catch (SocketException e) {
+
−			throw new SQLException(e.getMessage(), "08000");
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Retrieves the number of milliseconds the driver will wait for a
+
−	 * database request to complete. If the limit is exceeded, a
+
−	 * SQLException is thrown.
+
−	 *
+
−	 * @return the current timeout limit in milliseconds; zero means
+
−	 *         there is no limit
+
−	 * @throws SQLException if a database access error occurs or
+
−	 *         this method is called on a closed Connection
+
−	 * @since 1.7
+
−	 */
+
−	@Override
+
−	public int getNetworkTimeout() throws SQLException {
+
−		if (closed)
+
−			throw new SQLException("Cannot call on closed Connection", "M1M20");
+
−
+
−		try {
+
−			return server.getSoTimeout();
+
−		} catch (SocketException e) {
+
−			throw new SQLException(e.getMessage(), "08000");
+
−		}
+
−	}
+
−
+
−
+
−	//== end methods of interface java.sql.Connection
+
−
+
−
+
−	/**
+
−	 * Returns the MonetDB JDBC Connection URL (without user name and password).
+
−	 * Defined as public because it is called from: MonetDatabaseMetaData.java getURL()
+
−	 */
+
−	public String getJDBCURL() {
+
−		String language = "";
+
−		if (lang == LANG_MAL)
+
−			language = "?language=mal";
+
−		return "jdbc:monetdb://" + hostname + ":" + port + "/" +
+
−			database + language;
+
−	}
+
−
+
−	/**
+
−	 * Returns whether the BLOB type should be mapped to BINARY type.
+
−	 */
+
−	boolean getBlobAsBinary() {
+
−		return blobIsBinary;
+
−	}
+
−
+
−
+
−	/**
+
−	 * Sends the given string to MonetDB as special transaction command.
+
−	 * All possible returned information is discarded.
+
−	 * Encountered errors are reported.
+
−	 *
+
−	 * @param command the exact string to send to MonetDB
+
−	 * @throws SQLException if an IO exception or a database error occurs
+
−	 */
+
−	private void sendTransactionCommand(String command) throws SQLException {
+
−		// create a container for the result
+
−		ResponseList l = new ResponseList(0, 0, ResultSet.FETCH_FORWARD, ResultSet.CONCUR_READ_ONLY);
+
−		// send the appropriate query string to the database
+
−		try {
+
−			l.processQuery(command);
+
−		} finally {
+
−			l.close();
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Sends the given string to MonetDB as regular statement, making
+
−	 * sure there is a prompt after the command is sent.  All possible
+
−	 * returned information is discarded.  Encountered errors are
+
−	 * reported.
+
−	 *
+
−	 * @param command the exact string to send to MonetDB
+
−	 * @throws SQLException if an IO exception or a database error occurs
+
−	 */
+
−	void sendIndependentCommand(String command) throws SQLException {
+
−		synchronized (server) {
+
−			try {
+
−				out.writeLine(
+
−						(queryTempl[0] == null ? "" : queryTempl[0]) +
+
−						command +
+
−						(queryTempl[1] == null ? "" : queryTempl[1]));
+
−				String error = in.waitForPrompt();
+
−				if (error != null)
+
−					throw new SQLException(error.substring(6),
+
−							error.substring(0, 5));
+
−			} catch (SocketTimeoutException e) {
+
−				close(); // JDBC 4.1 semantics: abort()
+
−				throw new SQLException("connection timed out", "08M33");
+
−			} catch (IOException e) {
+
−				throw new SQLException(e.getMessage(), "08000");
+
−			}
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Sends the given string to MonetDB as control statement, making
+
−	 * sure there is a prompt after the command is sent.  All possible
+
−	 * returned information is discarded.  Encountered errors are
+
−	 * reported.
+
−	 *
+
−	 * @param command the exact string to send to MonetDB
+
−	 * @throws SQLException if an IO exception or a database error occurs
+
−	 */
+
−	void sendControlCommand(String command) throws SQLException {
+
−		// send X command
+
−		synchronized (server) {
+
−			try {
+
−				out.writeLine(
+
−						(commandTempl[0] == null ? "" : commandTempl[0]) +
+
−						command +
+
−						(commandTempl[1] == null ? "" : commandTempl[1]));
+
−				String error = in.waitForPrompt();
+
−				if (error != null)
+
−					throw new SQLException(error.substring(6),
+
−							error.substring(0, 5));
+
−			} catch (SocketTimeoutException e) {
+
−				close(); // JDBC 4.1 semantics, abort()
+
−				throw new SQLException("connection timed out", "08M33");
+
−			} catch (IOException e) {
+
−				throw new SQLException(e.getMessage(), "08000");
+
−			}
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Adds a warning to the pile of warnings this Connection object
+
−	 * has.  If there were no warnings (or clearWarnings was called)
+
−	 * this warning will be the first, otherwise this warning will get
+
−	 * appended to the current warning.
+
−	 *
+
−	 * @param reason the warning message
+
−	 */
+
−	void addWarning(String reason, String sqlstate) {
+
−		if (warnings == null) {
+
−			warnings = new SQLWarning(reason, sqlstate);
+
−		} else {
+
−			warnings.setNextWarning(new SQLWarning(reason, sqlstate));
+
−		}
+
−	}
+
−
+
−	/** the default number of rows that are (attempted to) read at once */
+
−	private final static int DEF_FETCHSIZE = 250;
+
−	/** The sequence counter */
+
−	private static int seqCounter = 0;
+
−
+
−	/** An optional thread that is used for sending large queries */
+
−	private SendThread sendThread = null;
+
−
+
−	/**
+
−	 * A Response is a message sent by the server to indicate some
+
−	 * action has taken place, and possible results of that action.
+
−	 */
+
−	// {{{ interface Response
+
−	interface Response {
+
−		/**
+
−		 * Adds a line to the underlying Response implementation.
+
−		 *
+
−		 * @param line the header line as String
+
−		 * @param linetype the line type according to the MAPI protocol
+
−		 * @return a non-null String if the line is invalid,
+
−		 *         or additional lines are not allowed.
+
−		 */
+
−		public abstract String addLine(String line, int linetype);
+
−
+
−		/**
+
−		 * Returns whether this Reponse expects more lines to be added
+
−		 * to it.
+
−		 *
+
−		 * @return true if a next line should be added, false otherwise
+
−		 */
+
−		public abstract boolean wantsMore();
+
−
+
−		/**
+
−		 * Indicates that no more header lines will be added to this
+
−		 * Response implementation.
+
−		 *
+
−		 * @throws SQLException if the contents of the Response is not
+
−		 *         consistent or sufficient.
+
−		 */
+
−		public abstract void complete() throws SQLException;
+
−
+
−		/**
+
−		 * Instructs the Response implementation to close and do the
+
−		 * necessary clean up procedures.
+
−		 *
+
−		 * @throws SQLException
+
−		 */
+
−		public abstract void close();
+
−	}
+
−	// }}}
+
−
+
−	/**
+
−	 * The ResultSetResponse represents a tabular result sent by the
+
−	 * server.  This is typically an SQL table.  The MAPI headers of the
+
−	 * Response look like:
+
−	 * <pre>
+
−	 * &amp;1 1 28 2 10
+
−	 * # name,     value # name
+
−	 * # varchar,  varchar # type
+
−	 * </pre>
+
−	 * there the first line consists out of<br />
+
−	 * <tt>&amp;"qt" "id" "tc" "cc" "rc"</tt>.
+
−	 */
+
−	// {{{ ResultSetResponse class implementation
+
−	class ResultSetResponse implements Response {
+
−		/** The number of columns in this result */
+
−		public final int columncount;
+
−		/** The total number of rows this result set has */
+
−		public final int tuplecount;
+
−		/** The numbers of rows to retrieve per DataBlockResponse */
+
−		private int cacheSize;
+
−		/** The table ID of this result */
+
−		public final int id;
+
−		/** The names of the columns in this result */
+
−		private String[] name;
+
−		/** The types of the columns in this result */
+
−		private String[] type;
+
−		/** The max string length for each column in this result */
+
−		private int[] columnLengths;
+
−		/** The table for each column in this result */
+
−		private String[] tableNames;
+
−		/** The query sequence number */
+
−		private final int seqnr;
+
−		/** A List of result blocks (chunks of size fetchSize/cacheSize) */
+
−		private DataBlockResponse[] resultBlocks;
+
−
+
−		/** A bitmap telling whether the headers are set or not */
+
−		private boolean[] isSet;
+
−		/** Whether this Response is closed */
+
−		private boolean closed;
+
−
+
−		/** The Connection that we should use when requesting a new block */
+
−		private MonetConnection.ResponseList parent;
+
−		/** Whether the fetchSize was explitly set by the user */
+
−		private boolean cacheSizeSetExplicitly = false;
+
−		/** Whether we should send an Xclose command to the server
+
−		 *  if we close this Response */
+
−		private boolean destroyOnClose;
+
−		/** the offset to be used on Xexport queries */
+
−		private int blockOffset = 0;
+
−
+
−		/** A parser for header lines */
+
−		HeaderLineParser hlp;
+
−
+
−		private final static int NAMES	= 0;
+
−		private final static int TYPES	= 1;
+
−		private final static int TABLES	= 2;
+
−		private final static int LENS	= 3;
+
−
+
−
+
−		/**
+
−		 * Sole constructor, which requires a MonetConnection parent to
+
−		 * be given.
+
−		 *
+
−		 * @param id the ID of the result set
+
−		 * @param tuplecount the total number of tuples in the result set
+
−		 * @param columncount the number of columns in the result set
+
−		 * @param rowcount the number of rows in the current block
+
−		 * @param parent the parent that created this Response and will
+
−		 *               supply new result blocks when necessary
+
−		 * @param seq the query sequence number
+
−		 */
+
−		ResultSetResponse(
+
−				int id,
+
−				int tuplecount,
+
−				int columncount,
+
−				int rowcount,
+
−				MonetConnection.ResponseList parent,
+
−				int seq)
+
−			throws SQLException
+
−		{
+
−			isSet = new boolean[7];
+
−			this.parent = parent;
+
−			if (parent.cachesize == 0) {
+
−				/* Below we have to calculate how many "chunks" we need
+
−				 * to allocate to store the entire result.  However, if
+
−				 * the user didn't set a cache size, as in this case, we
+
−				 * need to stick to our defaults. */
+
−				cacheSize = MonetConnection.DEF_FETCHSIZE;
+
−				cacheSizeSetExplicitly = false;
+
−			} else {
+
−				cacheSize = parent.cachesize;
+
−				cacheSizeSetExplicitly = true;
+
−			}
+
−			/* So far, so good.  Now the problem with EXPLAIN, DOT, etc
+
−			 * queries is, that they don't support any block fetching,
+
−			 * so we need to always fetch everything at once.  For that
+
−			 * reason, the cache size is here set to the rowcount if
+
−			 * it's larger, such that we do a full fetch at once.
+
−			 * (Because we always set a reply_size, we can only get a
+
−			 * larger rowcount from the server if it doesn't paginate,
+
−			 * because it's a pseudo SQL result.) */
+
−			if (rowcount > cacheSize)
+
−				cacheSize = rowcount;
+
−			seqnr = seq;
+
−			closed = false;
+
−			destroyOnClose = id > 0 && tuplecount > rowcount;
+
−
+
−			this.id = id;
+
−			this.tuplecount = tuplecount;
+
−			this.columncount = columncount;
+
−			this.resultBlocks =
+
−				new DataBlockResponse[(tuplecount / cacheSize) + 1];
+
−
+
−			hlp = new HeaderLineParser(columncount);
+
−
+
−			resultBlocks[0] = new DataBlockResponse(
+
−				rowcount,
+
−				parent.rstype == ResultSet.TYPE_FORWARD_ONLY
+
−			);
+
−		}
+
−
+
−		/**
+
−		 * Parses the given string and changes the value of the matching
+
−		 * header appropriately, or passes it on to the underlying
+
−		 * DataResponse.
+
−		 *
+
−		 * @param tmpLine the string that contains the header
+
−		 * @return a non-null String if the header cannot be parsed or
+
−		 *         is unknown
+
−		 */
+
−		// {{{ addLine
+
−		@Override
+
−		public String addLine(String tmpLine, int linetype) {
+
−			if (isSet[LENS] && isSet[TYPES] && isSet[TABLES] && isSet[NAMES]) {
+
−				return resultBlocks[0].addLine(tmpLine, linetype);
+
−			}
+
−
+
−			if (linetype != BufferedMCLReader.HEADER)
+
−				return "header expected, got: " + tmpLine;
+
−
+
−			// depending on the name of the header, we continue
+
−			try {
+
−				switch (hlp.parse(tmpLine)) {
+
−					case HeaderLineParser.NAME:
+
−						name = hlp.values.clone();
+
−						isSet[NAMES] = true;
+
−					break;
+
−					case HeaderLineParser.LENGTH:
+
−						columnLengths = hlp.intValues.clone();
+
−						isSet[LENS] = true;
+
−					break;
+
−					case HeaderLineParser.TYPE:
+
−						type = hlp.values.clone();
+
−						isSet[TYPES] = true;
+
−					break;
+
−					case HeaderLineParser.TABLE:
+
−						tableNames = hlp.values.clone();
+
−						isSet[TABLES] = true;
+
−					break;
+
−				}
+
−			} catch (MCLParseException e) {
+
−				return e.getMessage();
+
−			}
+
−
+
−			// all is well
+
−			return null;
+
−		}
+
−		// }}}
+
−
+
−		/**
+
−		 * Returns whether this ResultSetResponse needs more lines.
+
−		 * This method returns true if not all headers are set, or the
+
−		 * first DataBlockResponse reports to want more.
+
−		 */
+
−		@Override
+
−		public boolean wantsMore() {
+
−			if (isSet[LENS] && isSet[TYPES] && isSet[TABLES] && isSet[NAMES]) {
+
−				return resultBlocks[0].wantsMore();
+
−			} else {
+
−				return true;
+
−			}
+
−		}
+
−
+
−		/**
+
−		 * Returns an array of Strings containing the values between
+
−		 * ',\t' separators.
+
−		 *
+
−		 * @param chrLine a character array holding the input data
+
−		 * @param start where the relevant data starts
+
−		 * @param stop where the relevant data stops
+
−		 * @return an array of Strings
+
−		 */
+
−		final private String[] getValues(char[] chrLine, int start, int stop) {
+
−			int elem = 0;
+
−			String[] values = new String[columncount];
+
−
+
−			for (int i = start; i < stop; i++) {
+
−				if (chrLine[i] == '\t' && chrLine[i - 1] == ',') {
+
−					values[elem++] =
+
−						new String(chrLine, start, i - 1 - start);
+
−					start = i + 1;
+
−				}
+
−			}
+
−			// at the left over part
+
−			values[elem++] = new String(chrLine, start, stop - start);
+
−
+
−			return values;
+
−		}
+
−
+
−		/**
+
−		 * Adds the given DataBlockResponse to this ResultSetResponse at
+
−		 * the given block position.
+
−		 *
+
−		 * @param offset the offset number of rows for this block
+
−		 * @param rr the DataBlockResponse to add
+
−		 */
+
−		void addDataBlockResponse(int offset, DataBlockResponse rr) {
+
−			int block = (offset - blockOffset) / cacheSize;
+
−			resultBlocks[block] = rr;
+
−		}
+
−
+
−		/**
+
−		 * Marks this Response as being completed.  A complete Response
+
−		 * needs to be consistent with regard to its internal data.
+
−		 *
+
−		 * @throws SQLException if the data currently in this Response is not
+
−		 *                      sufficient to be consistant
+
−		 */
+
−		@Override
+
−		public void complete() throws SQLException {
+
−			String error = "";
+
−			if (!isSet[NAMES])  error += "name header missing\n";
+
−			if (!isSet[TYPES])  error += "type header missing\n";
+
−			if (!isSet[TABLES]) error += "table name header missing\n";
+
−			if (!isSet[LENS])   error += "column width header missing\n";
+
−			if (error != "") throw new SQLException(error, "M0M10");
+
−		}
+
−
+
−		/**
+
−		 * Returns the names of the columns
+
−		 *
+
−		 * @return the names of the columns
+
−		 */
+
−		String[] getNames() {
+
−			return name;
+
−		}
+
−
+
−		/**
+
−		 * Returns the types of the columns
+
−		 *
+
−		 * @return the types of the columns
+
−		 */
+
−		String[] getTypes() {
+
−			return type;
+
−		}
+
−
+
−		/**
+
−		 * Returns the tables of the columns
+
−		 *
+
−		 * @return the tables of the columns
+
−		 */
+
−		String[] getTableNames() {
+
−			return tableNames;
+
−		}
+
−
+
−		/**
+
−		 * Returns the lengths of the columns
+
−		 *
+
−		 * @return the lengths of the columns
+
−		 */
+
−		int[] getColumnLengths() {
+
−			return columnLengths;
+
−		}
+
−
+
−		/**
+
−		 * Returns the cache size used within this Response
+
−		 *
+
−		 * @return the cache size
+
−		 */
+
−		int getCacheSize() {
+
−			return cacheSize;
+
−		}
+
−
+
−		/**
+
−		 * Returns the current block offset
+
−		 *
+
−		 * @return the current block offset
+
−		 */
+
−		int getBlockOffset() {
+
−			return blockOffset;
+
−		}
+
−
+
−		/**
+
−		 * Returns the ResultSet type, FORWARD_ONLY or not.
+
−		 *
+
−		 * @return the ResultSet type
+
−		 */
+
−		int getRSType() {
+
−			return parent.rstype;
+
−		}
+
−
+
−		/**
+
−		 * Returns the concurrency of the ResultSet.
+
−		 *
+
−		 * @return the ResultSet concurrency
+
−		 */
+
−		int getRSConcur() {
+
−			return parent.rsconcur;
+
−		}
+
−
+
−		/**
+
−		 * Returns a line from the cache. If the line is already present in the
+
−		 * cache, it is returned, if not apropriate actions are taken to make
+
−		 * sure the right block is being fetched and as soon as the requested
+
−		 * line is fetched it is returned.
+
−		 *
+
−		 * @param row the row in the result set to return
+
−		 * @return the exact row read as requested or null if the requested row
+
−		 *         is out of the scope of the result set
+
−		 * @throws SQLException if an database error occurs
+
−		 */
+
−		String getLine(int row) throws SQLException {
+
−			if (row >= tuplecount || row < 0)
+
−				return null;
+
−
+
−			int block = (row - blockOffset) / cacheSize;
+
−			int blockLine = (row - blockOffset) % cacheSize;
+
−
+
−			// do we have the right block loaded? (optimistic try)
+
−			DataBlockResponse rawr;
+
−			// load block if appropriate
+
−			if ((rawr = resultBlocks[block]) == null) {
+
−				/// TODO: ponder about a maximum number of blocks to keep
+
−				///       in memory when dealing with random access to
+
−				///       reduce memory blow-up
+
−
+
−				// if we're running forward only, we can discard the old
+
−				// block loaded
+
−				if (parent.rstype == ResultSet.TYPE_FORWARD_ONLY) {
+
−					for (int i = 0; i < block; i++)
+
−						resultBlocks[i] = null;
+
−
+
−					if (MonetConnection.seqCounter - 1 == seqnr &&
+
−							!cacheSizeSetExplicitly &&
+
−							tuplecount - row > cacheSize &&
+
−							cacheSize < MonetConnection.DEF_FETCHSIZE * 10)
+
−					{
+
−						// there has no query been issued after this
+
−						// one, so we can consider this an uninterrupted
+
−						// continuation request.  Let's once increase
+
−						// the cacheSize as it was not explicitly set,
+
−						// since the chances are high that we won't
+
−						// bother anyone else by doing so, and just
+
−						// gaining some performance.
+
−
+
−						// store the previous position in the
+
−						// blockOffset variable
+
−						blockOffset += cacheSize;
+
−
+
−						// increase the cache size (a lot)
+
−						cacheSize *= 10;
+
−
+
−						// by changing the cacheSize, we also
+
−						// change the block measures.  Luckily
+
−						// we don't care about previous blocks
+
−						// because we have a forward running
+
−						// pointer only.  However, we do have
+
−						// to recalculate the block number, to
+
−						// ensure the next call to find this
+
−						// new block.
+
−						block = (row - blockOffset) / cacheSize;
+
−						blockLine = (row - blockOffset) % cacheSize;
+
−					}
+
−				}
+
−
+
−				// ok, need to fetch cache block first
+
−				parent.executeQuery(
+
−						commandTempl,
+
−						"export " + id + " " + ((block * cacheSize) + blockOffset) + " " + cacheSize
+
−				);
+
−				rawr = resultBlocks[block];
+
−				if (rawr == null)
+
−					throw new AssertionError("block " + block + " should have been fetched by now :(");
+
−			}
+
−
+
−			return rawr.getRow(blockLine);
+
−		}
+
−
+
−		/**
+
−		 * Closes this Response by sending an Xclose to the server indicating
+
−		 * that the result can be closed at the server side as well.
+
−		 */
+
−		@Override
+
−		public void close() {
+
−			if (closed) return;
+
−
+
−			// send command to server indicating we're done with this
+
−			// result only if we had an ID in the header and this result
+
−			// was larger than the reply size
+
−			try {
+
−				if (destroyOnClose)
+
−					sendControlCommand("close " + id);
+
−			} catch (SQLException e) {
+
−				// probably a connection error...
+
−			}
+
−
+
−			// close the data block associated with us
+
−			for (int i = 1; i < resultBlocks.length; i++) {
+
−				DataBlockResponse r = resultBlocks[i];
+
−				if (r != null)
+
−					r.close();
+
−			}
+
−
+
−			closed = true;
+
−		}
+
−
+
−		/**
+
−		 * Returns whether this Response is closed
+
−		 *
+
−		 * @return whether this Response is closed
+
−		 */
+
−		boolean isClosed() {
+
−			return closed;
+
−		}
+
−	}
+
−	// }}}
+
−
+
−	/**
+
−	 * The DataBlockResponse is tabular data belonging to a
+
−	 * ResultSetResponse.  Tabular data from the server typically looks
+
−	 * like:
+
−	 * <pre>
+
−	 * [ "value",	56	]
+
−	 * </pre>
+
−	 * where each column is separated by ",\t" and each tuple surrounded
+
−	 * by brackets ("[" and "]").  A DataBlockResponse object holds the
+
−	 * raw data as read from the server, in a parsed manner, ready for
+
−	 * easy retrieval.
+
−	 *
+
−	 * This object is not intended to be queried by multiple threads
+
−	 * synchronously. It is designed to work for one thread retrieving
+
−	 * rows from it.  When multiple threads will retrieve rows from this
+
−	 * object, it is possible for threads to get the same data.
+
−	 */
+
−	// {{{ DataBlockResponse class implementation
+
−	static class DataBlockResponse implements Response {
+
−		/** The String array to keep the data in */
+
−		private final String[] data;
+
−
+
−		/** The counter which keeps the current position in the data array */
+
−		private int pos;
+
−		/** Whether we can discard lines as soon as we have read them */
+
−		private boolean forwardOnly;
+
−
+
−		/**
+
−		 * Constructs a DataBlockResponse object
+
−		 * @param size the size of the data array to create
+
−		 * @param forward whether this is a forward only result
+
−		 */
+
−		DataBlockResponse(int size, boolean forward) {
+
−			pos = -1;
+
−			data = new String[size];
+
−			forwardOnly = forward;
+
−		}
+
−
+
−		/**
+
−		 * addLine adds a String of data to this object's data array.
+
−		 * Note that an IndexOutOfBoundsException can be thrown when an
+
−		 * attempt is made to add more than the original construction size
+
−		 * specified.
+
−		 *
+
−		 * @param line the header line as String
+
−		 * @param linetype the line type according to the MAPI protocol
+
−		 * @return a non-null String if the line is invalid,
+
−		 *         or additional lines are not allowed.
+
−		 */
+
−		@Override
+
−		public String addLine(String line, int linetype) {
+
−			if (linetype != BufferedMCLReader.RESULT)
+
−				return "protocol violation: unexpected line in data block: " + line;
+
−			// add to the backing array
+
−			data[++pos] = line;
+
−
+
−			// all is well
+
−			return null;
+
−		}
+
−
+
−		/**
+
−		 * Returns whether this Reponse expects more lines to be added
+
−		 * to it.
+
−		 *
+
−		 * @return true if a next line should be added, false otherwise
+
−		 */
+
−		@Override
+
−		public boolean wantsMore() {
+
−			// remember: pos is the value already stored
+
−			return pos + 1 < data.length;
+
−		}
+
−
+
−		/**
+
−		 * Indicates that no more header lines will be added to this
+
−		 * Response implementation.  In most cases this is a redundant
+
−		 * operation because the data array is full.  However... it can
+
−		 * happen that this is NOT the case!
+
−		 *
+
−		 * @throws SQLException if not all rows are filled
+
−		 */
+
−		@Override
+
−		public void complete() throws SQLException {
+
−			if ((pos + 1) != data.length)
+
−				throw new SQLException("Inconsistent state detected!  Current block capacity: "
+
−					+ data.length + ", block usage: " + (pos + 1) + ".  Did MonetDB send what it promised to?", "M0M10");
+
−		}
+
−
+
−		/**
+
−		 * Instructs the Response implementation to close and do the
+
−		 * necessary clean up procedures.
+
−		 *
+
−		 * @throws SQLException
+
−		 */
+
−		@Override
+
−		public void close() {
+
−			// feed all rows to the garbage collector
+
−			for (int i = 0; i < data.length; i++) data[i] = null;
+
−		}
+
−
+
−		/**
+
−		 * Retrieves the required row.  Warning: if the requested rows
+
−		 * is out of bounds, an IndexOutOfBoundsException will be
+
−		 * thrown.
+
−		 *
+
−		 * @param line the row to retrieve
+
−		 * @return the requested row as String
+
−		 */
+
−		String getRow(int line) {
+
−			if (forwardOnly) {
+
−				String ret = data[line];
+
−				data[line] = null;
+
−				return ret;
+
−			} else {
+
−				return data[line];
+
−			}
+
−		}
+
−	}
+
−	// }}}
+
−
+
−	/**
+
−	 * The UpdateResponse represents an update statement response.  It
+
−	 * is issued on an UPDATE, INSERT or DELETE SQL statement.  This
+
−	 * response keeps a count field that represents the affected rows
+
−	 * and a field that contains the last inserted auto-generated ID, or
+
−	 * -1 if not applicable.<br />
+
−	 * <tt>&amp;2 0 -1</tt>
+
−	 */
+
−	// {{{ UpdateResponse class implementation
+
−	static class UpdateResponse implements Response {
+
−		public final int count;
+
−		public final String lastid;
+
−
+
−		public UpdateResponse(int cnt, String id) {
+
−			// fill the blank finals
+
−			this.count = cnt;
+
−			this.lastid = id;
+
−		}
+
−
+
−		@Override
+
−		public String addLine(String line, int linetype) {
+
−			return "Header lines are not supported for an UpdateResponse";
+
−		}
+
−
+
−		@Override
+
−		public boolean wantsMore() {
+
−			return false;
+
−		}
+
−
+
−		@Override
+
−		public void complete() {
+
−			// empty, because there is nothing to check
+
−		}
+
−
+
−		@Override
+
−		public void close() {
+
−			// nothing to do here...
+
−		}
+
−	}
+
−	// }}}
+
−
+
−	/**
+
−	 * The SchemaResponse represents an schema modification response.
+
−	 * It is issued on statements like CREATE, DROP or ALTER TABLE.
+
−	 * This response keeps a field that represents the success state, as
+
−	 * defined by JDBC, which is currently in MonetDB's case alwats
+
−	 * SUCCESS_NO_INFO.  Note that this state is not sent by the
+
−	 * server.<br />
+
−	 * <tt>&amp;3</tt>
+
−	 */
+
−	// {{{ SchemaResponse class implementation
+
−	class SchemaResponse implements Response {
+
−		public final int state = Statement.SUCCESS_NO_INFO;
+
−
+
−		@Override
+
−		public String addLine(String line, int linetype) {
+
−			return "Header lines are not supported for a SchemaResponse";
+
−		}
+
−
+
−		@Override
+
−		public boolean wantsMore() {
+
−			return false;
+
−		}
+
−
+
−		@Override
+
−		public void complete() {
+
−			// empty, because there is nothing to check
+
−		}
+
−
+
−		@Override
+
−		public void close() {
+
−			// nothing to do here...
+
−		}
+
−	}
+
−	// }}}
+
−
+
−	/**
+
−	 * The AutoCommitResponse represents a transaction message.  It
+
−	 * stores (a change in) the server side auto commit mode.<br />
+
−	 * <tt>&amp;4 (t|f)</tt>
+
−	 */
+
−	// {{{ AutoCommitResponse class implementation
+
−	class AutoCommitResponse extends SchemaResponse {
+
−		public final boolean autocommit;
+
−
+
−		public AutoCommitResponse(boolean ac) {
+
−			// fill the blank final
+
−			this.autocommit = ac;
+
−		}
+
−	}
+
−	// }}}
+
−
+
−	/**
+
−	 * A list of Response objects.  Responses are added to this list.
+
−	 * Methods of this class are not synchronized.  This is left as
+
−	 * responsibility to the caller to prevent concurrent access.
+
−	 */
+
−	// {{{ ResponseList class implementation
+
−	class ResponseList {
+
−		/** The cache size (number of rows in a DataBlockResponse object) */
+
−		final int cachesize;
+
−		/** The maximum number of results for this query */
+
−		final int maxrows;
+
−		/** The ResultSet type to produce */
+
−		final int rstype;
+
−		/** The ResultSet concurrency to produce */
+
−		final int rsconcur;
+
−		/** The sequence number of this ResponseList */
+
−		final int seqnr;
+
−		/** A list of the Responses associated with the query,
+
−		 *  in the right order */
+
−		private List<Response> responses;
+
−		/** A map of ResultSetResponses, used for additional
+
−		 *  DataBlockResponse mapping */
+
−		private Map<Integer, ResultSetResponse> rsresponses;
+
−
+
−		/** The current header returned by getNextResponse() */
+
−		private int curResponse;
+
−
+
−		/**
+
−		 * Main constructor.  The query argument can either be a String
+
−		 * or List.  An SQLException is thrown if another object
+
−		 * instance is supplied.
+
−		 *
+
−		 * @param cachesize overall cachesize to use
+
−		 * @param maxrows maximum number of rows to allow in the set
+
−		 * @param rstype the type of result sets to produce
+
−		 * @param rsconcur the concurrency of result sets to produce
+
−		 */
+
−		ResponseList(
+
−				int cachesize,
+
−				int maxrows,
+
−				int rstype,
+
−				int rsconcur
+
−		) throws SQLException {
+
−			this.cachesize = cachesize;
+
−			this.maxrows = maxrows;
+
−			this.rstype = rstype;
+
−			this.rsconcur = rsconcur;
+
−			responses = new ArrayList<Response>();
+
−			curResponse = -1;
+
−			seqnr = MonetConnection.seqCounter++;
+
−		}
+
−
+
−		/**
+
−		 * Retrieves the next available response, or null if there are
+
−		 * no more responses.
+
−		 *
+
−		 * @return the next Response available or null
+
−		 */
+
−		Response getNextResponse() throws SQLException {
+
−			if (rstype == ResultSet.TYPE_FORWARD_ONLY) {
+
−				// free resources if we're running forward only
+
−				if (curResponse >= 0 && curResponse < responses.size()) {
+
−					Response tmp = responses.get(curResponse);
+
−					if (tmp != null) tmp.close();
+
−					responses.set(curResponse, null);
+
−				}
+
−			}
+
−			curResponse++;
+
−			if (curResponse >= responses.size()) {
+
−				// ResponseList is obviously completed so, there are no
+
−				// more responses
+
−				return null;
+
−			} else {
+
−				// return this response
+
−				return responses.get(curResponse);
+
−			}
+
−		}
+
−
+
−		/**
+
−		 * Closes the Reponse at index i, if not null.
+
−		 *
+
−		 * @param i the index position of the header to close
+
−		 */
+
−		void closeResponse(int i) {
+
−			if (i < 0 || i >= responses.size()) return;
+
−			Response tmp = responses.set(i, null);
+
−			if (tmp != null)
+
−				tmp.close();
+
−		}
+
−
+
−		/**
+
−		 * Closes the current response.
+
−		 */
+
−		void closeCurrentResponse() {
+
−			closeResponse(curResponse);
+
−		}
+
−
+
−		/**
+
−		 * Closes the current and previous responses.
+
−		 */
+
−		void closeCurOldResponses() {
+
−			for (int i = curResponse; i >= 0; i--) {
+
−				closeResponse(i);
+
−			}
+
−		}
+
−
+
−		/**
+
−		 * Closes this ResponseList by closing all the Responses in this
+
−		 * ResponseList.
+
−		 */
+
−		void close() {
+
−			for (int i = 0; i < responses.size(); i++) {
+
−				closeResponse(i);
+
−			}
+
−		}
+
−
+
−		/**
+
−		 * Returns whether this ResponseList has still unclosed
+
−		 * Responses.
+
−		 */
+
−		boolean hasUnclosedResponses() {
+
−			for (Response r : responses) {
+
−				if (r != null)
+
−					return true;
+
−			}
+
−			return false;
+
−		}
+
−
+
−		/**
+
−		 * Executes the query contained in this ResponseList, and
+
−		 * stores the Responses resulting from this query in this
+
−		 * ResponseList.
+
−		 *
+
−		 * @throws SQLException if a database error occurs
+
−		 */
+
−		void processQuery(String query) throws SQLException {
+
−			executeQuery(queryTempl, query);
+
−		}
+
−
+
−		/**
+
−		 * Internal executor of queries.
+
−		 *
+
−		 * @param templ the template to fill in
+
−		 * @param the query to execute
+
−		 * @throws SQLException if a database error occurs
+
−		 */
+
−		@SuppressWarnings("fallthrough")
+
−		void executeQuery(String[] templ, String query)
+
−			throws SQLException
+
−		{
+
−			boolean sendThreadInUse = false;
+
−			String error = null;
+
−
+
−			try {
+
−				synchronized (server) {
+
−					// make sure we're ready to send query; read data till we
+
−					// have the prompt it is possible (and most likely) that we
+
−					// already have the prompt and do not have to skip any
+
−					// lines.  Ignore errors from previous result sets.
+
−					in.waitForPrompt();
+
−
+
−					// {{{ set reply size
+
−					/**
+
−					 * Change the reply size of the server.  If the given
+
−					 * value is the same as the current value known to use,
+
−					 * then ignore this call.  If it is set to 0 we get a
+
−					 * prompt after the server sent it's header.
+
−					 */
+
−					int size = cachesize == 0 ? DEF_FETCHSIZE : cachesize;
+
−					size = maxrows != 0 ? Math.min(maxrows, size) : size;
+
−					// don't do work if it's not needed
+
−					if (lang == LANG_SQL && size != curReplySize && templ != commandTempl) {
+
−						sendControlCommand("reply_size " + size);
+
−
+
−						// store the reply size after a successful change
+
−						curReplySize = size;
+
−					}
+
−					// }}} set reply size
+
−
+
−					// If the query is larger than the TCP buffer size, use a
+
−					// special send thread to avoid deadlock with the server due
+
−					// to blocking behaviour when the buffer is full.  Because
+
−					// the server will be writing back results to us, it will
+
−					// eventually block as well when its TCP buffer gets full,
+
−					// as we are blocking an not consuming from it.  The result
+
−					// is a state where both client and server want to write,
+
−					// but block.
+
−					if (query.length() > MapiSocket.BLOCK) {
+
−						// get a reference to the send thread
+
−						if (sendThread == null)
+
−							sendThread = new SendThread(out);
+
−						// tell it to do some work!
+
−						sendThread.runQuery(templ, query);
+
−						sendThreadInUse = true;
+
−					} else {
+
−						// this is a simple call, which is a lot cheaper and will
+
−						// always succeed for small queries.
+
−						out.writeLine(
+
−								(templ[0] == null ? "" : templ[0]) +
+
−								query +
+
−								(templ[1] == null ? "" : templ[1]));
+
−					}
+
−
+
−					// go for new results
+
−					String tmpLine = in.readLine();
+
−					int linetype = in.getLineType();
+
−					Response res = null;
+
−					while (linetype != BufferedMCLReader.PROMPT) {
+
−						// each response should start with a start of header
+
−						// (or error)
+
−						switch (linetype) {
+
−							case BufferedMCLReader.SOHEADER:
+
−								// make the response object, and fill it
+
−								try {
+
−									switch (sohp.parse(tmpLine)) {
+
−										case StartOfHeaderParser.Q_PARSE:
+
−											throw new MCLParseException("Q_PARSE header not allowed here", 1);
+
−										case StartOfHeaderParser.Q_TABLE:
+
−										case StartOfHeaderParser.Q_PREPARE: {
+
−											int id = sohp.getNextAsInt();
+
−											int tuplecount = sohp.getNextAsInt();
+
−											int columncount = sohp.getNextAsInt();
+
−											int rowcount = sohp.getNextAsInt();
+
−											// enforce the maxrows setting
+
−											if (maxrows != 0 && tuplecount > maxrows)
+
−												tuplecount = maxrows;
+
−											res = new ResultSetResponse(
+
−													id,
+
−													tuplecount,
+
−													columncount,
+
−													rowcount,
+
−													this,
+
−													seqnr
+
−											);
+
−											// only add this resultset to
+
−											// the hashmap if it can possibly
+
−											// have an additional datablock
+
−											if (rowcount < tuplecount) {
+
−												if (rsresponses == null)
+
−													rsresponses = new HashMap<Integer, ResultSetResponse>();
+
−												rsresponses.put(
+
−														Integer.valueOf(id),
+
−														(ResultSetResponse) res
+
−												);
+
−											}
+
−										} break;
+
−										case StartOfHeaderParser.Q_UPDATE:
+
−											res = new UpdateResponse(
+
−													sohp.getNextAsInt(),   // count
+
−													sohp.getNextAsString() // key-id
+
−													);
+
−										break;
+
−										case StartOfHeaderParser.Q_SCHEMA:
+
−											res = new SchemaResponse();
+
−										break;
+
−										case StartOfHeaderParser.Q_TRANS:
+
−											boolean ac = sohp.getNextAsString().equals("t") ? true : false;
+
−											if (autoCommit && ac) {
+
−												addWarning("Server enabled auto commit " +
+
−														"mode while local state " +
+
−														"already was auto commit.", "01M11"
+
−														);
+
−											}
+
−											autoCommit = ac;
+
−											res = new AutoCommitResponse(ac);
+
−										break;
+
−										case StartOfHeaderParser.Q_BLOCK: {
+
−											// a new block of results for a
+
−											// response...
+
−											int id = sohp.getNextAsInt();
+
−											sohp.getNextAsInt();	// columncount
+
−											int rowcount = sohp.getNextAsInt();
+
−											int offset = sohp.getNextAsInt();
+
−											ResultSetResponse t =
+
−												rsresponses.get(Integer.valueOf(id));
+
−											if (t == null) {
+
−												error = "M0M12!no ResultSetResponse with id " + id + " found";
+
−												break;
+
−											}
+
−
+
−											DataBlockResponse r =
+
−												new DataBlockResponse(
+
−													rowcount,	// rowcount
+
−													t.getRSType() == ResultSet.TYPE_FORWARD_ONLY
+
−												);
+
−
+
−											t.addDataBlockResponse(offset, r);
+
−											res = r;
+
−										} break;
+
−									}
+
−								} catch (MCLParseException e) {
+
−									error = "M0M10!error while parsing start of header:\n" +
+
−										e.getMessage() +
+
−										" found: '" + tmpLine.charAt(e.getErrorOffset()) + "'" +
+
−										" in: \"" + tmpLine + "\"" +
+
−										" at pos: " + e.getErrorOffset();
+
−									// flush all the rest
+
−									in.waitForPrompt();
+
−									linetype = in.getLineType();
+
−									break;
+
−								}
+
−
+
−								// immediately handle errors after parsing
+
−								// the header (res may be null)
+
−								if (error != null) {
+
−									in.waitForPrompt();
+
−									linetype = in.getLineType();
+
−									break;
+
−								}
+
−
+
−								// here we have a res object, which
+
−								// we can start filling
+
−								while (res.wantsMore()) {
+
−									error = res.addLine(
+
−											in.readLine(),
+
−											in.getLineType()
+
−									);
+
−									if (error != null) {
+
−										// right, some protocol violation,
+
−										// skip the rest of the result
+
−										error = "M0M10!" + error;
+
−										in.waitForPrompt();
+
−										linetype = in.getLineType();
+
−										break;
+
−									}
+
−								}
+
−								if (error != null)
+
−									break;
+
−								// it is of no use to store
+
−								// DataBlockReponses, you never want to
+
−								// retrieve them directly anyway
+
−								if (!(res instanceof DataBlockResponse))
+
−									responses.add(res);
+
−
+
−								// read the next line (can be prompt, new
+
−								// result, error, etc.) before we start the
+
−								// loop over
+
−								tmpLine = in.readLine();
+
−								linetype = in.getLineType();
+
−							break;
+
−							case BufferedMCLReader.INFO:
+
−								addWarning(tmpLine.substring(1), "01000");
+
−
+
−								// read the next line (can be prompt, new
+
−								// result, error, etc.) before we start the
+
−								// loop over
+
−								tmpLine = in.readLine();
+
−								linetype = in.getLineType();
+
−							break;
+
−							default:	// Yeah... in Java this is correct!
+
−								// we have something we don't
+
−								// expect/understand, let's make it an error
+
−								// message
+
−								tmpLine = "!M0M10!protocol violation, unexpected line: " + tmpLine;
+
−								// don't break; fall through...
+
−							case BufferedMCLReader.ERROR:
+
−								// read everything till the prompt (should be
+
−								// error) we don't know if we ignore some
+
−								// garbage here... but the log should reveal
+
−								// that
+
−								error = in.waitForPrompt();
+
−								linetype = in.getLineType();
+
−								if (error != null) {
+
−									error = tmpLine.substring(1) + "\n" + error;
+
−								} else {
+
−									error = tmpLine.substring(1);
+
−								}
+
−							break;
+
−						}
+
−					}
+
−				}
+
−
+
−				// if we used the sendThread, make sure it has finished
+
−				if (sendThreadInUse) {
+
−					String tmp = sendThread.getErrors();
+
−					if (tmp != null) {
+
−						if (error == null) {
+
−							error = "08000!" + tmp;
+
−						} else {
+
−							error += "\n08000!" + tmp;
+
−						}
+
−					}
+
−				}
+
−				if (error != null) {
+
−					SQLException ret = null;
+
−					String[] errors = error.split("\n");
+
−					for (int i = 0; i < errors.length; i++) {
+
−						if (ret == null) {
+
−							ret = new SQLException(errors[i].substring(6),
+
−									errors[i].substring(0, 5));
+
−						} else {
+
−							ret.setNextException(new SQLException(
+
−										errors[i].substring(6),
+
−										errors[i].substring(0, 5)));
+
−						}
+
−					}
+
−					throw ret;
+
−				}
+
−			} catch (SocketTimeoutException e) {
+
−				close(); // JDBC 4.1 semantics, abort()
+
−				throw new SQLException("connection timed out", "08M33");
+
−			} catch (IOException e) {
+
−				closed = true;
+
−				throw new SQLException(e.getMessage() + " (mserver still alive?)", "08000");
+
−			}
+
−		}
+
−	}
+
−	// }}}
+
−
+
−	/**
+
−	 * A thread to send a query to the server.  When sending large
+
−	 * amounts of data to a server, the output buffer of the underlying
+
−	 * communication socket may overflow.  In such case the sending
+
−	 * process blocks.  In order to prevent deadlock, it might be
+
−	 * desirable that the driver as a whole does not block.  This thread
+
−	 * facilitates the prevention of such 'full block', because this
+
−	 * separate thread only will block.<br />
+
−	 * This thread is designed for reuse, as thread creation costs are
+
−	 * high.
+
−	 */
+
−	// {{{ SendThread class implementation
+
−	static class SendThread extends Thread {
+
−		/** The state WAIT represents this thread to be waiting for
+
−		 *  something to do */
+
−		private final static int WAIT = 0;
+
−		/** The state QUERY represents this thread to be executing a query */
+
−		private final static int QUERY = 1;
+
−		/** The state SHUTDOWN is the final state that ends this thread */
+
−		private final static int SHUTDOWN = -1;
+
−
+
−		private String[] templ;
+
−		private String query;
+
−		private BufferedMCLWriter out;
+
−		private String error;
+
−		private int state = WAIT;
+
−
+
−		final Lock sendLock = new ReentrantLock();
+
−		final Condition queryAvailable = sendLock.newCondition();
+
−		final Condition waiting = sendLock.newCondition();
+
−
+
−		/**
+
−		 * Constructor which immediately starts this thread and sets it
+
−		 * into daemon mode.
+
−		 *
+
−		 * @param monet the socket to write to
+
−		 */
+
−		public SendThread(BufferedMCLWriter out) {
+
−			super("SendThread");
+
−			setDaemon(true);
+
−			this.out = out;
+
−			start();
+
−		}
+
−
+
−		@Override
+
−		public void run() {
+
−			sendLock.lock();
+
−			try {
+
−				while (true) {
+
−					while (state == WAIT) {
+
−						try {
+
−							queryAvailable.await();
+
−						} catch (InterruptedException e) {
+
−							// woken up, eh?
+
−						}
+
−					}
+
−					if (state == SHUTDOWN)
+
−						break;
+
−
+
−					// state is QUERY here
+
−					try {
+
−						out.writeLine(
+
−								(templ[0] == null ? "" : templ[0]) +
+
−								query +
+
−								(templ[1] == null ? "" : templ[1]));
+
−					} catch (IOException e) {
+
−						error = e.getMessage();
+
−					}
+
−
+
−					// update our state, and notify, maybe someone is waiting
+
−					// for us in throwErrors
+
−					state = WAIT;
+
−					waiting.signal();
+
−				}
+
−			} finally {
+
−				sendLock.unlock();
+
−			}
+
−		}
+
−
+
−		/**
+
−		 * Starts sending the given query over the given socket.  Beware
+
−		 * that the thread should be finished (can be assured by calling
+
−		 * throwErrors()) before this method is called!
+
−		 *
+
−		 * @param templ the query template
+
−		 * @param query the query itself
+
−		 * @throws SQLException if this SendThread is already in use
+
−		 */
+
−		public void runQuery(String[] templ, String query) throws SQLException {
+
−			sendLock.lock();
+
−			try {
+
−				if (state != WAIT)
+
−					throw new SQLException("SendThread already in use or shutting down!", "M0M03");
+
−
+
−				this.templ = templ;
+
−				this.query = query;
+
−
+
−				// let the thread know there is some work to do
+
−				state = QUERY;
+
−				queryAvailable.signal();
+
−			} finally {
+
−				sendLock.unlock();
+
−			}
+
−		}
+
−
+
−		/**
+
−		 * Returns errors encountered during the sending process.
+
−		 *
+
−		 * @return the errors or null if none
+
−		 */
+
−		public String getErrors() {
+
−			sendLock.lock();
+
−			try {
+
−				// make sure the thread is in WAIT state, not QUERY
+
−				while (state == QUERY) {
+
−					try {
+
−						waiting.await();
+
−					} catch (InterruptedException e) {
+
−						// just try again
+
−					}
+
−				}
+
−				if (state == SHUTDOWN)
+
−					error = "SendThread is shutting down";
+
−			} finally {
+
−				sendLock.unlock();
+
−			}
+
−			return error;
+
−		}
+
−
+
−		/**
+
−		 * Requests this SendThread to stop.
+
−		 */
+
−		public void shutdown() {
+
−			sendLock.lock();
+
−			state = SHUTDOWN;
+
−			sendLock.unlock();
+
−			this.interrupt();  // break any wait conditions
+
−		}
+
−	}
+
−	// }}}
+
−}