+
−/*
+
− * 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 - 2020 MonetDB B.V.
+
− */
+
−
+
−package nl.cwi.monetdb.client;
+
−
+
−import nl.cwi.monetdb.util.CmdLineOpts;
+
−import nl.cwi.monetdb.util.Exporter;
+
−import nl.cwi.monetdb.util.OptionsException;
+
−import nl.cwi.monetdb.util.SQLExporter;
+
−import nl.cwi.monetdb.util.XMLExporter;
+
−
+
−import java.io.BufferedReader;
+
−import java.io.BufferedWriter;
+
−import java.io.IOException;
+
−import java.io.InputStreamReader;
+
−import java.io.File;
+
−import java.io.PrintWriter;
+
−import java.net.HttpURLConnection;
+
−import java.net.URL;
+
−import java.sql.Connection;
+
−import java.sql.DriverManager;	// required as it will load the nl.cwi.monetdb.jdbc.MonetDriver class
+
−import java.sql.DatabaseMetaData;
+
−import java.sql.ResultSet;
+
−import java.sql.Statement;
+
−import java.sql.SQLException;
+
−import java.sql.SQLWarning;
+
−import java.util.ArrayList;
+
−import java.util.LinkedList;
+
−import java.util.List;
+
−
+
−/**
+
− * This program acts like an extended client program for MonetDB. Its
+
− * look and feel is very much like PostgreSQL's interactive terminal
+
− * program.  Although it looks like this client is designed for MonetDB,
+
− * it demonstrates the power of the JDBC interface since it built on top
+
− * of JDBC only.
+
− *
+
− * @author Fabian Groffen, Martin van Dinther
+
− * @version 1.3
+
− */
+
−
+
−public final class JdbcClient {
+
−
+
−	private static Connection con;
+
−	private static DatabaseMetaData dbmd;
+
−	private static Statement stmt;
+
−	private static BufferedReader in;
+
−	private static PrintWriter out;
+
−	private static Exporter exporter;
+
−
+
−	/**
+
−	 * JdbcClient is a command line query tool for MonetDB, similar to mclient.
+
−	 * It uses the JDBC API and the MonetDB JDBC driver to communicate with a
+
−	 * MonetDB server. The MonetDB JDBC driver is included in the jdbcclient.jre7.jar
+
−	 * for ease of use, so only 1 jar file is needed to use it.
+
−	 *
+
−	 * <pre>Usage java -jar jdbcclient.jre7.jar
+
−	 *		[-h host[:port]] [-p port] [-f file] [-u user]
+
−	 *		[-l language] [-d database] [-e] [-D [table]]
+
−	 *		[-X&lt;opt&gt;]
+
−	 * or using long option equivalents --host --port --file --user --language
+
−	 * --dump --echo --database.
+
−	 * Arguments may be written directly after the option like -p50000.
+
−	 *
+
−	 * If no host and port are given, localhost and 50000 are assumed.
+
−	 * An .monetdb file may exist in the user's home directory.  This file can contain
+
−	 * preferences to use each time JdbcClient is started.  Options given on the
+
−	 * command line override the preferences file.  The .monetdb file syntax is
+
−	 * &lt;option&gt;=&lt;value&gt; where option is one of the options host, port, file, mode
+
−	 * debug, or password.  Note that the last one is perilous and therefore not
+
−	 * available as command line option.
+
−	 * If no input file is given using the -f flag, an interactive session is
+
−	 * started on the terminal.
+
−	 *
+
−	 * OPTIONS
+
−	 * -h --host     The hostname of the host that runs the MonetDB database.  A port
+
−	 *               number can be supplied by use of a colon, i.e. -h somehost:12345.
+
−	 * -p --port     The port number to connect to.
+
−	 * -f --file     A file name to use either for reading or writing.  The file will
+
−	 *               be used for writing when dump mode is used (-D --dump).  In read
+
−	 *               mode, the file can also be an URL pointing to a plain text file
+
−	 *               that is optionally gzip compressed.
+
−	 * -u --user     The username to use when connecting to the database.
+
−	 * -d --database Try to connect to the given database (only makes sense if
+
−	 *               connecting to monetdbd).
+
−	 * -l --language Use the given language, defaults to 'sql'.
+
−	 * --help        This help screen.
+
−	 * --version     Display driver version and exit.
+
−	 * -e --echo     Also outputs the contents of the input file, if any.
+
−	 * -q --quiet    Suppress printing the welcome header.
+
−	 * -D --dump     Dumps the given table(s), or the complete database if none given.
+
−	 * -Xoutput      The output mode when dumping.  Default is sql, xml may be used for
+
−	 *               an experimental XML output.
+
−	 * -Xhash        Use the given hash algorithm during challenge response.  Supported
+
−	 *               algorithm names: SHA1, MD5, plain.
+
−	 * -Xdebug       Writes a transmission log to disk for debugging purposes.  If a
+
−	 *               file name is given, it is used, otherwise a file called
+
−	 *               monet&lt;timestamp&gt;.log is created.  A given file never be
+
−	 *               overwritten; instead a unique variation of the file is used.
+
−	 * -Xbatching    Indicates that a batch should be used instead of direct
+
−	 *               communication with the server for each statement.  If a number is
+
−	 *               given, it is used as batch size.  i.e. 8000 would execute the
+
−	 *               contents on the batch after each 8000 statements read.  Batching
+
−	 *               can greatly speedup the process of restoring a database dump.</pre>
+
−	 *
+
−	 * @param args optional list of startup arguments
+
−	 * @throws Exception if uncaught exception is thrown
+
−	 */
+
−	public final static void main(String[] args) throws Exception {
+
−		final CmdLineOpts copts = new CmdLineOpts();
+
−
+
−		// arguments which take exactly one argument
+
−		copts.addOption("h", "host", CmdLineOpts.CAR_ONE, "localhost",
+
−				"The hostname of the host that runs the MonetDB database.  " +
+
−				"A port number can be supplied by use of a colon, i.e. " +
+
−				"-h somehost:12345.");
+
−		copts.addOption("p", "port", CmdLineOpts.CAR_ONE, "50000",
+
−				"The port number to connect to.");
+
−		// todo make it CAR_ONE_MANY
+
−		copts.addOption("f", "file", CmdLineOpts.CAR_ONE, null,
+
−				"A file name to use either for reading or writing.  The " +
+
−				"file will be used for writing when dump mode is used " +
+
−				"(-D --dump).  In read mode, the file can also be an URL " +
+
−				"pointing to a plain text file that is optionally gzip " +
+
−				"compressed.");
+
−		copts.addOption("u", "user", CmdLineOpts.CAR_ONE, System.getProperty("user.name"),
+
−				"The username to use when connecting to the database.");
+
−		// this one is only here for the .monetdb file parsing, it is
+
−		// removed before the command line arguments are parsed
+
−		copts.addOption(null, "password", CmdLineOpts.CAR_ONE, null, null);
+
−		copts.addOption("d", "database", CmdLineOpts.CAR_ONE, "",
+
−				"Try to connect to the given database (only makes sense " +
+
−				"if connecting to monetdbd).");
+
−		copts.addOption("l", "language", CmdLineOpts.CAR_ONE, "sql",
+
−				"Use the given language, defaults to 'sql'.");
+
−
+
−		// arguments which have no argument(s)
+
−		copts.addOption(null, "help", CmdLineOpts.CAR_ZERO, null,
+
−				"This help screen.");
+
−		copts.addOption(null, "version", CmdLineOpts.CAR_ZERO, null,
+
−				"Display driver version and exit.");
+
−		copts.addOption("e", "echo", CmdLineOpts.CAR_ZERO, null,
+
−				"Also outputs the contents of the input file, if any.");
+
−		copts.addOption("q", "quiet", CmdLineOpts.CAR_ZERO, null,
+
−				"Suppress printing the welcome header.");
+
−
+
−		// arguments which have zero to many arguments
+
−		copts.addOption("D", "dump", CmdLineOpts.CAR_ZERO_MANY, null,
+
−				"Dumps the given table(s), or the complete database if " +
+
−				"none given.");
+
−
+
−		// extended options
+
−		copts.addOption(null, "Xoutput", CmdLineOpts.CAR_ONE, null,
+
−				"The output mode when dumping.  Default is sql, xml may " +
+
−				"be used for an experimental XML output.");
+
−		copts.addOption(null, "Xhash", CmdLineOpts.CAR_ONE, null,
+
−				"Use the given hash algorithm during challenge response.  " +
+
−				"Supported algorithm names: SHA1, MD5, plain.");
+
−		// arguments which can have zero or one argument(s)
+
−		copts.addOption(null, "Xdebug", CmdLineOpts.CAR_ZERO_ONE, null,
+
−				"Writes a transmission log to disk for debugging purposes.  " +
+
−				"If a file name is given, it is used, otherwise a file " +
+
−				"called monet<timestamp>.log is created.  A given file " +
+
−				"never be overwritten; instead a unique variation of the " +
+
−				"file is used.");
+
−		copts.addOption(null, "Xbatching", CmdLineOpts.CAR_ZERO_ONE, null,
+
−				"Indicates that a batch should be used instead of direct " +
+
−				"communication with the server for each statement.  If a " +
+
−				"number is given, it is used as batch size.  i.e. 8000 " +
+
−				"would execute the contents on the batch after each 8000 " +
+
−				"statements read.  Batching can greatly speedup the " +
+
−				"process of restoring a database dump.");
+
−
+
−		// we store user and password in separate variables in order to
+
−		// be able to properly act on them like forgetting the password
+
−		// from the user's file if the user supplies a username on the
+
−		// command line arguments
+
−		String pass = null;
+
−		String user = null;
+
−
+
−		// look for a file called .monetdb in the current dir or in the
+
−		// user's homedir and read its preferences
+
−		File pref = new File(".monetdb");
+
−		if (!pref.exists())
+
−			pref = new File(System.getProperty("user.home"), ".monetdb");
+
−		if (pref.exists()) {
+
−			try {
+
−				copts.processFile(pref);
+
−			} catch (OptionsException e) {
+
−				System.err.println("Error in " + pref.getAbsolutePath() + ": " + e.getMessage());
+
−				System.exit(1);
+
−			}
+
−			user = copts.getOption("user").getArgument();
+
−			pass = copts.getOption("password").getArgument();
+
−		}
+
−
+
−		// process the command line arguments, remove password option
+
−		// first, and save the user we had at this point
+
−		copts.removeOption("password");
+
−		try {
+
−			copts.processArgs(args);
+
−		} catch (OptionsException e) {
+
−			System.err.println("Error: " + e.getMessage());
+
−			System.exit(1);
+
−		}
+
−		// we can actually compare pointers (objects) here
+
−		if (user != copts.getOption("user").getArgument())
+
−			pass = null;
+
−
+
−		if (copts.getOption("help").isPresent()) {
+
−			System.out.print(
+
−				"Usage java -jar jdbcclient.jre7.jar\n" +
+
−				"\t\t[-h host[:port]] [-p port] [-f file] [-u user]\n" +
+
−				"\t\t[-l language] [-d database] [-e] [-D [table]]\n" +
+
−				"\t\t[-X<opt>]\n" +
+
−				"or using long option equivalents --host --port --file --user --language\n" +
+
−				"--dump --echo --database.\n" +
+
−				"Arguments may be written directly after the option like -p50000.\n" +
+
−				"\n" +
+
−				"If no host and port are given, localhost and 50000 are assumed.\n" +
+
−				"An .monetdb file may exist in the user's home directory.  This file can contain\n" +
+
−				"preferences to use each time JdbcClient is started.  Options given on the\n" +
+
−				"command line override the preferences file.  The .monetdb file syntax is\n" +
+
−				"<option>=<value> where option is one of the options host, port, file, mode\n" +
+
−				"debug, or password.  Note that the last one is perilous and therefore not\n" +
+
−				"available as command line option.\n" +
+
−				"If no input file is given using the -f flag, an interactive session is\n" +
+
−				"started on the terminal.\n" +
+
−				"\n" +
+
−				"OPTIONS\n" +
+
−				copts.produceHelpMessage()
+
−				);
+
−			System.exit(0);
+
−		}
+
−
+
−		if (copts.getOption("version").isPresent()) {
+
−			// We cannot use the DatabaseMetaData here, because we
+
−			// cannot get a Connection.  So instead, we just get the
+
−			// values we want out of the Driver directly.
+
−			System.out.println("JDBC Driver: v" + nl.cwi.monetdb.jdbc.MonetDriver.getDriverVersion());
+
−			System.exit(0);
+
−		}
+
−
+
−		// whether the semi-colon at the end of a String terminates the
+
−		// query or not (default = yes => SQL)
+
−		final boolean scolonterm = true;
+
−		final boolean xmlMode = "xml".equals(copts.getOption("Xoutput").getArgument());
+
−
+
−		// we need the password from the user, fetch it with a pseudo
+
−		// password protector
+
−		if (pass == null) {
+
−			final char[] tmp = System.console().readPassword("password: ");
+
−			if (tmp == null) {
+
−				System.err.println("Invalid password!");
+
−				System.exit(1);
+
−			}
+
−			pass = String.valueOf(tmp);
+
−		}
+
−
+
−		user = copts.getOption("user").getArgument();
+
−
+
−		// build the hostname
+
−		String host = copts.getOption("host").getArgument();
+
−		if (host.indexOf(":") == -1) {
+
−			host = host + ":" + copts.getOption("port").getArgument();
+
−		}
+
−
+
−		// make sure the driver is loaded
+
−		// Class.forName("nl.cwi.monetdb.jdbc.MonetDriver");	// not needed anymore for self registering JDBC drivers
+
−
+
−		// build the extra arguments of the JDBC connect string
+
−		String attr = "?";
+
−		CmdLineOpts.OptionContainer oc = copts.getOption("language");
+
−		final String lang = oc.getArgument();
+
−		if (oc.isPresent())
+
−			attr += "language=" + lang + "&";
+
−
+
−/* Xquery is no longer functional or supported
+
−		// set some behaviour based on the language XQuery
+
−		if (lang.equals("xquery")) {
+
−			scolonterm = false;	// no ; to end a statement
+
−			if (!copts.getOption("Xoutput").isPresent())
+
−				xmlMode = true; // the user will like xml results, most probably
+
−		}
+
−*/
+
−		oc = copts.getOption("Xdebug");
+
−		if (oc.isPresent()) {
+
−			attr += "debug=true&";
+
−			if (oc.getArgumentCount() == 1)
+
−				attr += "logfile=" + oc.getArgument() + "&";
+
−		}
+
−		oc = copts.getOption("Xhash");
+
−		if (oc.isPresent())
+
−			attr += "hash=" + oc.getArgument() + "&";
+
−
+
−		// request a connection suitable for MonetDB from the driver
+
−		// manager note that the database specifier is only used when
+
−		// connecting to a proxy-like service, since MonetDB itself
+
−		// can't access multiple databases.
+
−		con = null;
+
−		final String database = copts.getOption("database").getArgument();
+
−		try {
+
−			con = DriverManager.getConnection(
+
−					"jdbc:monetdb://" + host + "/" + database + attr,
+
−					user,
+
−					pass
+
−			);
+
−			SQLWarning warn = con.getWarnings();
+
−			while (warn != null) {
+
−				System.err.println("Connection warning: " + warn.getMessage());
+
−				warn = warn.getNextWarning();
+
−			}
+
−			con.clearWarnings();
+
−		} catch (SQLException e) {
+
−			System.err.println("Database connect failed: " + e.getMessage());
+
−			System.exit(1);
+
−		}
+
−
+
−		try {
+
−			dbmd = con.getMetaData();
+
−		} catch (SQLException e) {
+
−			// we ignore this because it's probably because we don't use
+
−			// SQL language
+
−			dbmd = null;
+
−		}
+
−
+
−		in = new BufferedReader(new InputStreamReader(System.in));
+
−		out = new PrintWriter(new BufferedWriter(new java.io.OutputStreamWriter(System.out)));
+
−
+
−		stmt = con.createStatement();	// is used by doDump
+
−
+
−		// see if we will have to perform a database dump (only in SQL mode)
+
−		if ("sql".equals(lang) && copts.getOption("dump").isPresent() && dbmd != null) {
+
−			// use the given file for writing
+
−			oc = copts.getOption("file");
+
−			if (oc.isPresent())
+
−				out = new PrintWriter(new BufferedWriter(new java.io.FileWriter(oc.getArgument())));
+
−
+
−			// we only want user tables and views to be dumped, unless a specific table is requested
+
−			final String[] types = {"TABLE","VIEW","MERGE TABLE","REMOTE TABLE","REPLICA TABLE","STREAM TABLE"};
+
−			// Future: fetch all type names using dbmd.getTableTypes() and construct String[] with all
+
−			// table type names excluding the SYSTEM ... ones and LOCAL TEMPORARY TABLE ones.
+
−
+
−			// request the list of tables available in the current schema in the database
+
−			ResultSet tbl = dbmd.getTables(null, con.getSchema(), null,
+
−							(copts.getOption("dump").getArgumentCount() == 0) ? types : null);
+
−			// fetch all tables and store them in a LinkedList of Table objects
+
−			final LinkedList<Table> tables = new LinkedList<Table>();
+
−			while (tbl.next()) {
+
−				tables.add(new Table(
+
−					tbl.getString(2),	// 2 = "TABLE_SCHEM"
+
−					tbl.getString(3),	// 3 = "TABLE_NAME"
+
−					tbl.getString(4)));	// 4 = "TABLE_TYPE"
+
−			}
+
−			tbl.close();
+
−			tbl = null;
+
−
+
−			if (xmlMode) {
+
−				exporter = new XMLExporter(out);
+
−				exporter.setProperty(XMLExporter.TYPE_NIL, XMLExporter.VALUE_XSI);
+
−			} else {
+
−				exporter = new SQLExporter(out);
+
−				// stick with SQL INSERT INTO commands for now
+
−				// in the future we might do COPY INTO's here using VALUE_COPY
+
−				exporter.setProperty(SQLExporter.TYPE_OUTPUT, SQLExporter.VALUE_INSERT);
+
−			}
+
−			exporter.useSchemas(true);
+
−
+
−			// start SQL output
+
−			if (!xmlMode)
+
−				out.println("START TRANSACTION;\n");
+
−
+
−			// dump specific table(s) or not?
+
−			if (copts.getOption("dump").getArgumentCount() > 0) { // yes we do
+
−				final String[] dumpers = copts.getOption("dump").getArguments();
+
−				for (int i = 0; i < tables.size(); i++) {
+
−					Table ttmp = tables.get(i);
+
−					for (int j = 0; j < dumpers.length; j++) {
+
−						String dumptblnm = dumpers[j].toString();
+
−						if (ttmp.getName().equalsIgnoreCase(dumptblnm) ||
+
−						    ttmp.getFqname().equalsIgnoreCase(dumptblnm))
+
−						{
+
−							// dump the table
+
−							doDump(out, ttmp);
+
−						}
+
−					}
+
−				}
+
−			} else {
+
−				/* this returns everything, so including SYSTEM TABLE constraints */
+
−				tbl = dbmd.getImportedKeys(null, null, null);
+
−				while (tbl.next()) {
+
−					// find FK table object  6 = "FKTABLE_SCHEM", 7 = "FKTABLE_NAME"
+
−					Table fk = Table.findTable(tbl.getString(6), tbl.getString(7), tables);
+
−
+
−					// find PK table object  2 = "PKTABLE_SCHEM", 3 = "PKTABLE_NAME"
+
−					Table pk = Table.findTable(tbl.getString(2), tbl.getString(3), tables);
+
−
+
−					// this happens when a system table has referential constraints
+
−					if (fk == null || pk == null)
+
−						continue;
+
−
+
−					// add PK table dependency to FK table
+
−					fk.addDependency(pk);
+
−				}
+
−				tbl.close();
+
−				tbl = null;
+
−
+
−				// search for cycles of type a -> (x ->)+ b probably not
+
−				// the most optimal way, but it works by just scanning
+
−				// every table for loops in a recursive manor
+
−				for (Table t : tables) {
+
−					Table.checkForLoop(t, new ArrayList<Table>());
+
−				}
+
−
+
−				// find the graph, at this point we know there are no
+
−				// cycles, thus a solution exists
+
−				for (int i = 0; i < tables.size(); i++) {
+
−					final List<Table> needs = tables.get(i).requires(tables.subList(0, i + 1));
+
−					if (needs.size() > 0) {
+
−						tables.removeAll(needs);
+
−						tables.addAll(i, needs);
+
−
+
−						// re-evaluate this position, for there is a new
+
−						// table now
+
−						i--;
+
−					}
+
−				}
+
−
+
−				// we now have the right order to dump tables
+
−				for (Table t : tables) {
+
−					// dump the table
+
−					doDump(out, t);
+
−				}
+
−			}
+
−
+
−			if (!xmlMode)
+
−				out.println("COMMIT;");
+
−			out.flush();
+
−
+
−			// free resources, close the statement
+
−			stmt.close();
+
−			// close the connection with the database
+
−			con.close();
+
−			// completed database dump
+
−			System.exit(0);
+
−		}
+
−
+
−		if (xmlMode) {
+
−			exporter = new XMLExporter(out);
+
−			exporter.setProperty(XMLExporter.TYPE_NIL, XMLExporter.VALUE_XSI);
+
−		} else {
+
−			exporter = new SQLExporter(out);
+
−			// we want nice table formatted output
+
−			exporter.setProperty(SQLExporter.TYPE_OUTPUT, SQLExporter.VALUE_TABLE);
+
−		}
+
−		exporter.useSchemas(false);
+
−
+
−		try {
+
−			// use the given file for reading
+
−			final boolean hasFile = copts.getOption("file").isPresent();
+
−			final boolean doEcho = hasFile && copts.getOption("echo").isPresent();
+
−			if (hasFile) {
+
−				final String tmp = copts.getOption("file").getArgument();
+
−				try {
+
−					in = getReader(tmp);
+
−				} catch (Exception e) {
+
−					System.err.println("Error: " + e.getMessage());
+
−					System.exit(1);
+
−				}
+
−
+
−				// check for batch mode
+
−				int batchSize = 0;
+
−				oc = copts.getOption("Xbatching");
+
−				if (oc.isPresent()) {
+
−					if (oc.getArgumentCount() == 1) {
+
−						// parse the number
+
−						try {
+
−							batchSize = Integer.parseInt(oc.getArgument());
+
−						} catch (NumberFormatException ex) {
+
−							// complain to the user
+
−							throw new IllegalArgumentException("Illegal argument for Xbatching: " + oc.getArgument() + " is not a parseable number!");
+
−						}
+
−					}
+
−					processBatch(batchSize);
+
−				} else {
+
−					processInteractive(true, doEcho, scolonterm, user);
+
−				}
+
−			} else {
+
−				if (!copts.getOption("quiet").isPresent()) {
+
−					// print welcome message
+
−					out.println("Welcome to the MonetDB interactive JDBC terminal!");
+
−					if (dbmd != null) {
+
−						out.println("JDBC Driver: " + dbmd.getDriverName() +
+
−							" v" + dbmd.getDriverVersion());
+
−						out.println("Database Server: " + dbmd.getDatabaseProductName() +
+
−							" v" + dbmd.getDatabaseProductVersion());
+
−					}
+
−					out.println("Current Schema: " + con.getSchema());
+
−					out.println("Type \\q to quit (you can also use: quit or exit), \\? or \\h for a list of available commands");
+
−					out.flush();
+
−				}
+
−				processInteractive(false, doEcho, scolonterm, user);
+
−			}
+
−
+
−			// free resources, close the statement
+
−			stmt.close();
+
−			// close the connection with the database
+
−			con.close();
+
−			// close the file (if we used a file)
+
−			in.close();
+
−		} catch (Exception e) {
+
−			System.err.println("A fatal exception occurred: " + e.toString());
+
−			e.printStackTrace(System.err);
+
−			// at least try to close the connection properly, since it will
+
−			// close all statements associated with it
+
−			try {
+
−				con.close();
+
−			} catch (SQLException ex) {
+
−				// ok... nice try
+
−			}
+
−			System.exit(1);
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Tries to interpret the given String as URL or file.  Returns the
+
−	 * assigned BufferedReader, or throws an Exception if the given
+
−	 * string couldn't be identified as a valid URL or file.
+
−	 *
+
−	 * @param uri URL or filename as String
+
−	 * @return a BufferedReader for the uri
+
−	 * @throws Exception if uri cannot be identified as a valid URL or file
+
−	 */
+
−	static BufferedReader getReader(final String uri) throws Exception {
+
−		BufferedReader ret = null;
+
−		URL u = null;
+
−
+
−		// Try and parse as URL first
+
−		try {
+
−			u = new URL(uri);
+
−		} catch (java.net.MalformedURLException e) {
+
−			// no URL, try as file
+
−			try {
+
−				ret = new BufferedReader(new java.io.FileReader(uri));
+
−			} catch (java.io.FileNotFoundException fnfe) {
+
−				// the message is descriptive enough, adds "(No such file
+
−				// or directory)" itself.
+
−				throw new Exception(fnfe.getMessage());
+
−			}
+
−		}
+
−
+
−		if (ret == null) {
+
−			try {
+
−				HttpURLConnection.setFollowRedirects(true);
+
−				final HttpURLConnection con = (HttpURLConnection)u.openConnection();
+
−				con.setRequestMethod("GET");
+
−				final String ct = con.getContentType();
+
−				if ("application/x-gzip".equals(ct)) {
+
−					// open gzip stream
+
−					ret = new BufferedReader(new InputStreamReader(
+
−							new java.util.zip.GZIPInputStream(con.getInputStream())));
+
−				} else {
+
−					// text/plain otherwise just attempt to read as is
+
−					ret = new BufferedReader(new InputStreamReader(con.getInputStream()));
+
−				}
+
−			} catch (IOException e) {
+
−				// failed to open the url
+
−				throw new Exception("No such host/file: " + e.getMessage());
+
−			} catch (Exception e) {
+
−				// this is an exception that comes from deep ...
+
−				throw new Exception("Invalid URL: " + e.getMessage());
+
−			}
+
−		}
+
−
+
−		return ret;
+
−	}
+
−
+
−	/**
+
−	 * Starts an interactive processing loop, where output is adjusted to an
+
−	 * user session.  This processing loop is not suitable for bulk processing
+
−	 * as in executing the contents of a file, since processing on the given
+
−	 * input is done after each row that has been entered.
+
−	 *
+
−	 * @param hasFile a boolean indicating whether a file is used as input
+
−	 * @param doEcho a boolean indicating whether to echo the given input
+
−	 * @param scolonterm whether a ';' makes this query part complete
+
−	 * @param user a String representing the username of the current user
+
−	 * @throws IOException if an IO exception occurs
+
−	 * @throws SQLException if a database related error occurs
+
−	 */
+
−	private static void processInteractive(
+
−		final boolean hasFile,
+
−		final boolean doEcho,
+
−		final boolean scolonterm,
+
−		final String user)
+
−		throws IOException, SQLException
+
−	{
+
−		// an SQL stack keeps track of ( " and '
+
−		final SQLStack stack = new SQLStack();
+
−		boolean lastac = false;
+
−
+
−		if (!hasFile) {
+
−			lastac = con.getAutoCommit();
+
−			out.println("auto commit mode: " + (lastac ? "on" : "off"));
+
−			out.print(getPrompt(stack, true));
+
−			out.flush();
+
−		}
+
−
+
−		String curLine;
+
−		String query = "";
+
−		boolean doProcess;
+
−		boolean wasComplete = true;
+
−
+
−		// the main (interactive) process loop
+
−		for (long i = 1; true; i++) {
+
−			// Manually read a line, because we want to detect an EOF
+
−			// (ctrl-D).  Doing so allows to have a terminator for query
+
−			// which is not based on a special character, as is the
+
−			// problem for XQuery
+
−			curLine = in.readLine();
+
−			if (curLine == null) {
+
−				out.println("");
+
−				if (!query.isEmpty()) {
+
−					try {
+
−						executeQuery(query, stmt, out, !hasFile);
+
−					} catch (SQLException e) {
+
−						out.flush();
+
−						do {
+
−							if (hasFile) {
+
−								System.err.println("Error on line " + i + ": [" + e.getSQLState() + "] " + e.getMessage());
+
−							} else {
+
−								System.err.println("Error [" + e.getSQLState() + "]: " + e.getMessage());
+
−							}
+
−							// print all error messages in the chain (if any)
+
−						} while ((e = e.getNextException()) != null);
+
−					}
+
−					query = "";
+
−					wasComplete = true;
+
−					if (!hasFile) {
+
−						final boolean ac = con.getAutoCommit();
+
−						if (ac != lastac) {
+
−							out.println("auto commit mode: " + (ac ? "on" : "off"));
+
−							lastac = ac;
+
−						}
+
−						out.print(getPrompt(stack, wasComplete));
+
−					}
+
−					out.flush();
+
−					// try to read again
+
−					continue;
+
−				} else {
+
−					// user did ctrl-D without something in the buffer,
+
−					// so terminate
+
−					break;
+
−				}
+
−			}
+
−
+
−			if (doEcho) {
+
−				out.println(curLine);
+
−				out.flush();
+
−			}
+
−
+
−			// a query part is a line of an SQL query
+
−			QueryPart qp = scanQuery(curLine, stack, scolonterm);
+
−			if (!qp.isEmpty()) {
+
−				final String command = qp.getQuery();
+
−				doProcess = true;
+
−				if (wasComplete) {
+
−					doProcess = false;
+
−					// check for commands only when the previous row was complete
+
−					if (command.equals("\\q") || command.equals("quit") || command.equals("exit")) {
+
−						// quit
+
−						break;
+
−					} else if (command.equals("\\?") || command.equals("\\h")) {
+
−						out.println("Available commands:");
+
−						out.println("\\q       quits this program (you can also use: quit or exit)");
+
−						if (dbmd != null) {
+
−							out.println("\\d       list available tables and views in current schema");
+
−							out.println("\\dS      list available system tables and views in sys schema");
+
−							out.println("\\d <obj> describes the given table or view");
+
−						}
+
−						out.println("\\l<uri>  executes the contents of the given file or URL");
+
−						out.println("\\i<uri>  batch executes the inserts from the given file or URL");
+
−						out.println("\\? or \\h this help screen");
+
−					} else if (dbmd != null && command.startsWith("\\d")) {
+
−						ResultSet tbl = null;
+
−						try {
+
−							if (command.equals("\\dS")) {
+
−								// list available system tables and views in sys schema
+
−								tbl = dbmd.getTables(null, "sys", null, null);
+
−
+
−								// give us a list of all non-system tables and views (including temp ones)
+
−								while (tbl.next()) {
+
−									final String tableType = tbl.getString(4);	// 4 = "TABLE_TYPE"
+
−									if (tableType != null && tableType.startsWith("SYSTEM ")) {
+
−										String tableNm = tbl.getString(3);	// 3 = "TABLE_NAME"
+
−										if (tableNm.contains(" ") || tableNm.contains("\t"))
+
−											tableNm = dq(tableNm);
+
−										out.println(tableType + "\t" +
+
−											tbl.getString(2) + "." +	// 2 = "TABLE_SCHEM"
+
−											tableNm);
+
−									}
+
−								}
+
−							} else {
+
−								String object = command.substring(2).trim();
+
−								if (scolonterm && object.endsWith(";"))
+
−									object = object.substring(0, object.length() - 1);
+
−								if (object.isEmpty()) {
+
−									// list available user tables and views in current schema
+
−									tbl = dbmd.getTables(null, con.getSchema(), null, null);
+
−
+
−									// give us a list of all non-system tables and views (including temp ones)
+
−									while (tbl.next()) {
+
−										final String tableType = tbl.getString(4);	// 4 = "TABLE_TYPE"
+
−										if (tableType != null && !tableType.startsWith("SYSTEM ")) {
+
−											String tableNm = tbl.getString(3);	// 3 = "TABLE_NAME"
+
−											if (tableNm.contains(" ") || tableNm.contains("\t"))
+
−												tableNm = dq(tableNm);
+
−											out.println(tableType + "\t" +
+
−												tbl.getString(2) + "." +	// 2 = "TABLE_SCHEM"
+
−												tableNm);
+
−										}
+
−									}
+
−								} else {
+
−									// describes the given table or view
+
−									String schema;
+
−									String obj_nm = object;
+
−									int len;
+
−									boolean found = false;
+
−									final int dot = object.indexOf(".");
+
−									if (dot > 0) {
+
−										// use specified schema
+
−										schema = object.substring(0, dot);
+
−										obj_nm = object.substring(dot + 1);
+
−										// remove potential surrounding double quotes around schema name
+
−										len = schema.length();
+
−										if (len > 2 && schema.charAt(0) == '"' && schema.charAt(len -1) == '"')
+
−											schema = schema.substring(1, len -1);
+
−									} else {
+
−										// use current schema
+
−										schema = con.getSchema();
+
−									}
+
−									// remove potential surrounding double quotes around table or view name
+
−									len = obj_nm.length();
+
−									if (len > 2 && obj_nm.charAt(0) == '"' && obj_nm.charAt(len -1) == '"')
+
−										obj_nm = obj_nm.substring(1, len -1);
+
−
+
−									// System.err.println("calling dbmd.getTables(" + schema + ", " + obj_nm + ")");
+
−									tbl = dbmd.getTables(null, schema, obj_nm, null);
+
−									while (tbl.next() && !found) {
+
−										final String schemaName = tbl.getString(2);	// 2 = "TABLE_SCHEM"
+
−										final String tableName = tbl.getString(3);	// 3 = "TABLE_NAME"
+
−										if (obj_nm.equals(tableName) && schema.equals(schemaName)) {
+
−											// we found it, describe it
+
−											exporter.dumpSchema(dbmd,
+
−												tbl.getString(4),	// 4 = "TABLE_TYPE"
+
−												schemaName,
+
−												tableName);
+
−
+
−											found = true;
+
−											break;
+
−										}
+
−									}
+
−									if (!found)
+
−										System.err.println("No match found for table or view: " + object);
+
−								}
+
−							}
+
−						} catch (SQLException e) {
+
−							out.flush();
+
−							do {
+
−								System.err.println("Error [" + e.getSQLState() + "]: " + e.getMessage());
+
−								// print all error messages in the chain (if any)
+
−							} while ((e = e.getNextException()) != null);
+
−						} finally {
+
−							if (tbl != null)
+
−								tbl.close();
+
−						}
+
−					} else if (command.startsWith("\\l") || command.startsWith("\\i")) {
+
−						String object = command.substring(2).trim();
+
−						if (scolonterm && object.endsWith(";"))
+
−							object = object.substring(0, object.length() - 1);
+
−						if (object.isEmpty()) {
+
−							System.err.println("Usage: '" + command.substring(0, 2) + "<uri>' where <uri> is a file or URL");
+
−						} else {
+
−							// temporarily redirect input from in
+
−							final BufferedReader console = in;
+
−							try {
+
−								in = getReader(object);
+
−								if (command.startsWith("\\l")) {
+
−									processInteractive(true, doEcho, scolonterm, user);
+
−								} else {
+
−									processBatch(0);
+
−								}
+
−							} catch (Exception e) {
+
−								out.flush();
+
−								System.err.println("Error: " + e.getMessage());
+
−							} finally {
+
−								// put back in redirection
+
−								in = console;
+
−							}
+
−						}
+
−					} else {
+
−						doProcess = true;
+
−					}
+
−				}
+
−
+
−				if (doProcess) {
+
−					query += command + (qp.hasOpenQuote() ? "\\n" : " ");
+
−					if (qp.isComplete()) {
+
−						// strip off trailing ';'
+
−						query = query.substring(0, query.length() - 2);
+
−						// execute query
+
−						try {
+
−							executeQuery(query, stmt, out, !hasFile);
+
−						} catch (SQLException e) {
+
−							out.flush();
+
−							final String startmsg = (hasFile ? ("Error on line " + i + ": [") : "Error [");
+
−							do {
+
−								System.err.println(startmsg + e.getSQLState() + "] " + e.getMessage());
+
−								// print all error messages in the chain (if any)
+
−							} while ((e = e.getNextException()) != null);
+
−						}
+
−						query = "";
+
−						wasComplete = true;
+
−					} else {
+
−						wasComplete = false;
+
−					}
+
−				}
+
−			}
+
−
+
−			if (!hasFile) {
+
−				final boolean ac = con.getAutoCommit();
+
−				if (ac != lastac) {
+
−					out.println("auto commit mode: " + (ac ? "on" : "off"));
+
−					lastac = ac;
+
−				}
+
−				out.print(getPrompt(stack, wasComplete));
+
−			}
+
−			out.flush();
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Executes the given query and prints the result tabularised to the
+
−	 * given PrintWriter stream.  The result of this method is the
+
−	 * default output of a query: tabular data.
+
−	 *
+
−	 * @param query the query to execute
+
−	 * @param stmt the Statement to execute the query on
+
−	 * @param out the PrintWriter to write to
+
−	 * @param showTiming flag to specify if timing information nees to be printed
+
−	 * @throws SQLException if a database related error occurs
+
−	 */
+
−	private static void executeQuery(final String query,
+
−			final Statement stmt,
+
−			final PrintWriter out,
+
−			final boolean showTiming)
+
−		throws SQLException
+
−	{
+
−		// warnings generated during querying
+
−		SQLWarning warn;
+
−		long startTime = (showTiming ? System.currentTimeMillis() : 0);
+
−		long finishTime = 0;
+
−
+
−		// execute the query, let the driver decide what type it is
+
−		int aff = -1;
+
−		boolean	nextRslt = stmt.execute(query, Statement.RETURN_GENERATED_KEYS);
+
−		if (!nextRslt)
+
−			aff = stmt.getUpdateCount();
+
−		do {
+
−			if (nextRslt) {
+
−				// we have a ResultSet, print it
+
−				final ResultSet rs = stmt.getResultSet();
+
−
+
−				exporter.dumpResultSet(rs);
+
−				if (showTiming) {
+
−					finishTime = System.currentTimeMillis();
+
−					out.println("Elapsed Time: " + (finishTime - startTime) + " ms");
+
−					startTime = finishTime;
+
−				}
+
−
+
−				// if there were warnings for this result,
+
−				// show them!
+
−				warn = rs.getWarnings();
+
−				if (warn != null) {
+
−					// force stdout to be written so the
+
−					// warning appears below it
+
−					out.flush();
+
−					do {
+
−						System.err.println("ResultSet warning: " +
+
−							warn.getMessage());
+
−						warn = warn.getNextWarning();
+
−					} while (warn != null);
+
−					rs.clearWarnings();
+
−				}
+
−				rs.close();
+
−			} else if (aff != -1) {
+
−				String timingoutput = "";
+
−				if (showTiming) {
+
−					finishTime = System.currentTimeMillis();
+
−					timingoutput = ". Elapsed Time: " + (finishTime - startTime) + " ms";
+
−					startTime = finishTime;
+
−				}
+
−
+
−				if (aff == Statement.SUCCESS_NO_INFO) {
+
−					out.println("Operation successful" + timingoutput);
+
−				} else {
+
−					// we have an update count
+
−					// see if a key was generated
+
−					final ResultSet rs = stmt.getGeneratedKeys();
+
−					final boolean hasGeneratedKeyData = rs.next();
+
−					out.println(aff + " affected row" + (aff != 1 ? "s" : "") +
+
−						(hasGeneratedKeyData ? ", last generated key: " + rs.getString(1) : "") +
+
−						timingoutput);
+
−					rs.close();
+
−				}
+
−			}
+
−
+
−			out.flush();
+
−		} while ((nextRslt = stmt.getMoreResults()) ||
+
−			 (aff = stmt.getUpdateCount()) != -1);
+
−
+
−		// if there were warnings for this statement,
+
−		// and/or connection show them!
+
−		warn = stmt.getWarnings();
+
−		while (warn != null) {
+
−			System.err.println("Statement warning: " + warn.getMessage());
+
−			warn = warn.getNextWarning();
+
−		}
+
−		stmt.clearWarnings();
+
−
+
−		warn = con.getWarnings();
+
−		while (warn != null) {
+
−			// suppress warning when issueing a "set schema xyz;" command
+
−			if ( !(warn.getMessage()).equals("Server enabled auto commit mode while local state already was auto commit.") )
+
−				System.err.println("Connection warning: " + warn.getMessage());
+
−			warn = warn.getNextWarning();
+
−		}
+
−		con.clearWarnings();
+
−	}
+
−
+
−	/**
+
−	 * Starts a processing loop optimized for processing (large) chunks of
+
−	 * continuous data, such as input from a file.  Unlike in the interactive
+
−	 * loop above, queries are sent only to the database if a certain batch
+
−	 * amount is reached.  No client side query checks are made, but everything
+
−	 * is sent to the server as-is.
+
−	 *
+
−	 * @param batchSize the number of items to store in the batch before
+
−	 *		sending them to the database for execution.
+
−	 * @throws IOException if an IO exception occurs.
+
−	 */
+
−	private static void processBatch(final int batchSize) throws IOException {
+
−		final StringBuilder query = new StringBuilder(2048);
+
−		int i = 0;
+
−		try {
+
−			String curLine;
+
−			// the main loop
+
−			for (i = 1; (curLine = in.readLine()) != null; i++) {
+
−				query.append(curLine);
+
−				if (curLine.endsWith(";")) {
+
−					// lousy check for end of statement, but in batch mode it
+
−					// is not very important to catch all end of statements...
+
−					stmt.addBatch(query.toString());
+
−					query.setLength(0);	// clear the buffer
+
−				} else {
+
−					query.append('\n');
+
−				}
+
−				if (batchSize > 0 && i % batchSize == 0) {
+
−					stmt.executeBatch();
+
−					stmt.clearBatch();
+
−				}
+
−			}
+
−			stmt.addBatch(query.toString());
+
−			stmt.executeBatch();
+
−			stmt.clearBatch();
+
−		} catch (SQLException e) {
+
−			do {
+
−				System.err.println("Error at line " + i + ": [" + e.getSQLState() + "] " + e.getMessage());
+
−				// print all error messages in the chain (if any)
+
−			} while ((e = e.getNextException()) != null);
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Wrapper method that decides to dump SQL or XML.  In the latter case,
+
−	 * this method does the XML data generation.
+
−	 *
+
−	 * @param out a Writer to write the data to
+
−	 * @param table the table to dump
+
−	 * @throws SQLException if a database related error occurs
+
−	 */
+
−	private static void doDump(final PrintWriter out, final Table table) throws SQLException {
+
−		final String tableType = table.getType();
+
−
+
−		// dump CREATE definition of this table/view
+
−		exporter.dumpSchema(dbmd, tableType, table.getSchem(), table.getName());
+
−		out.println();
+
−
+
−		// only dump data from real tables, not from views / MERGE / REMOTE / REPLICA tables
+
−		if (tableType.contains("TABLE")
+
−		&& !tableType.equals("MERGE TABLE")
+
−		&& !tableType.equals("REMOTE TABLE")
+
−		&& !tableType.equals("REPLICA TABLE")) {
+
−			final ResultSet rs = stmt.executeQuery("SELECT * FROM " + table.getFqnameQ());
+
−			if (rs != null) {
+
−				exporter.dumpResultSet(rs);
+
−				rs.close();
+
−				out.println();
+
−			}
+
−		}
+
−	}
+
−
+
−	/**
+
−	 * Simple helper method that generates a prompt.
+
−	 *
+
−	 * @param stack the current SQLStack
+
−	 * @param compl whether the statement is complete
+
−	 * @return a prompt which consist of "sql" plus the top of the stack
+
−	 */
+
−	private static String getPrompt(final SQLStack stack, final boolean compl) {
+
−		return (compl ? "sql" : "more") + (stack.empty() ? ">" : stack.peek()) + " ";
+
−	}
+
−
+
−	/**
+
−	 * Scans the given string and tries to discover if it is a complete query
+
−	 * or that there needs something to be added.  If a string doesn't end with
+
−	 * a ; it is considered not to be complete.  SQL string quotation using ' and
+
−	 * SQL identifier quotation using " is taken into account when scanning a
+
−	 * string this way.
+
−	 * Additionally, this method removes comments from the SQL statements,
+
−	 * identified by -- and removes white space where appropriate.
+
−	 *
+
−	 * @param query the query to parse
+
−	 * @param stack query stack to work with
+
−	 * @param scolonterm whether a ';' makes this query part complete
+
−	 * @return a QueryPart object containing the results of this parse
+
−	 */
+
−	private static QueryPart scanQuery(
+
−			final String query,
+
−			final SQLStack stack,
+
−			final boolean scolonterm)
+
−	{
+
−		// examine string, char for char
+
−		boolean wasInString = (stack.peek() == '\'');
+
−		boolean wasInIdentifier = (stack.peek() == '"');
+
−		boolean escaped = false;
+
−		int len = query.length();
+
−		for (int i = 0; i < len; i++) {
+
−			switch(query.charAt(i)) {
+
−				case '\\':
+
−					escaped = !escaped;
+
−				break;
+
−				default:
+
−					escaped = false;
+
−				break;
+
−				case '\'':
+
−					/**
+
−					 * We can not be in a string if we are in an identifier. So
+
−					 * If we find a ' and are not in an identifier, and not in
+
−					 * a string we can safely assume we will be now in a string.
+
−					 * If we are in a string already, we should stop being in a
+
−					 * string if we find a quote which is not prefixed by a \,
+
−					 * for that would be an escaped quote. However, a nasty
+
−					 * situation can occur where the string is like 'test \\'.
+
−					 * As obvious, a test for a \ in front of a ' doesn't hold
+
−					 * here. Because 'test \\\'' can exist as well, we need to
+
−					 * know if a quote is prefixed by an escaping slash or not.
+
−					 */
+
−					if (!escaped && stack.peek() != '"') {
+
−						if (stack.peek() != '\'') {
+
−							// although it makes no sense to escape a quote
+
−							// outside a string, it is escaped, thus not meant
+
−							// as quote for us, apparently
+
−							stack.push('\'');
+
−						} else {
+
−							stack.pop();
+
−						}
+
−					}
+
−					// reset escaped flag
+
−					escaped = false;
+
−				break;
+
−				case '"':
+
−					if (!escaped && stack.peek() != '\'') {
+
−						if (stack.peek() != '"') {
+
−							stack.push('"');
+
−						} else {
+
−							stack.pop();
+
−						}
+
−					}
+
−					// reset escaped flag
+
−					escaped = false;
+
−				break;
+
−				case '-':
+
−					if (!escaped && stack.peek() != '\'' && stack.peek() != '"' && i + 1 < len && query.charAt(i + 1) == '-') {
+
−						len = i;
+
−					}
+
−					escaped = false;
+
−				break;
+
−				case '(':
+
−					if (!escaped && stack.peek() != '\'' && stack.peek() != '"') {
+
−						stack.push('(');
+
−					}
+
−					escaped = false;
+
−				break;
+
−				case ')':
+
−					if (!escaped && stack.peek() == '(') {
+
−						stack.pop();
+
−					}
+
−					escaped = false;
+
−				break;
+
−			}
+
−		}
+
−
+
−		int start = 0;
+
−		if (!wasInString && !wasInIdentifier && len > 0) {
+
−			// trim spaces at the start of the string
+
−			for (; start < len && Character.isWhitespace(query.charAt(start)); start++);
+
−		}
+
−		int stop = len - 1;
+
−		if (stack.peek() !=  '\'' && !wasInIdentifier && stop > start) {
+
−			// trim spaces at the end of the string
+
−			for (; stop >= start && Character.isWhitespace(query.charAt(stop)); stop--);
+
−		}
+
−		stop++;
+
−
+
−		if (start == stop) {
+
−			// we have an empty string
+
−			return new QueryPart(false, null, stack.peek() ==  '\'' || stack.peek() == '"');
+
−		} else if (stack.peek() ==  '\'' || stack.peek() == '"') {
+
−			// we have an open quote
+
−			return new QueryPart(false, query.substring(start, stop), true);
+
−		} else {
+
−			// see if the string is complete
+
−			if (scolonterm && query.charAt(stop - 1) == ';') {
+
−				return new QueryPart(true, query.substring(start, stop), false);
+
−			} else {
+
−				return new QueryPart(false, query.substring(start, stop), false);
+
−			}
+
−		}
+
−	}
+
−
+
−	static final String dq(final String in) {
+
−		return "\"" + in.replaceAll("\\\\", "\\\\\\\\").replaceAll("\"", "\\\\\"") + "\"";
+
−	}
+
−}
+
−
+
−/**
+
− * A QueryPart is (a part of) a SQL query.  In the QueryPart object information
+
− * like the actual SQL query string, whether it has an open quote and the like
+
− * is stored.
+
− */
+
−final class QueryPart {
+
−	private final boolean complete;
+
−	private final String query;
+
−	private final boolean open;
+
−
+
−	QueryPart(final boolean complete, final String query, final boolean open) {
+
−		this.complete = complete;
+
−		this.query = query;
+
−		this.open = open;
+
−	}
+
−
+
−	boolean isEmpty() {
+
−		return query == null;
+
−	}
+
−
+
−	boolean isComplete() {
+
−		return complete;
+
−	}
+
−
+
−	String getQuery() {
+
−		return query;
+
−	}
+
−
+
−	boolean hasOpenQuote() {
+
−		return open;
+
−	}
+
−}
+
−
+
−/**
+
− * An SQLStack is a simple stack that keeps track of open brackets and
+
− * (single and double) quotes in an SQL query.
+
− */
+
−final class SQLStack {
+
−	final StringBuilder stack = new StringBuilder();
+
−
+
−	char peek() {
+
−		if (empty()) {
+
−			return '\0';
+
−		} else {
+
−			return stack.charAt(stack.length() - 1);
+
−		}
+
−	}
+
−
+
−	char pop() {
+
−		final char tmp = peek();
+
−		if (tmp != '\0') {
+
−			stack.setLength(stack.length() - 1);
+
−		}
+
−		return tmp;
+
−	}
+
−
+
−	char push(char item) {
+
−		stack.append(item);
+
−		return item;
+
−	}
+
−
+
−	boolean empty() {
+
−		return stack.length() == 0;
+
−	}
+
−}
+
−
+
−/**
+
− * A Table represents an SQL table.  All data required to
+
− * generate a fully qualified name is stored, as well as dependency
+
− * data.
+
− */
+
−final class Table {
+
−	final String schem;
+
−	final String name;
+
−	final String type;
+
−	final String fqname;
+
−	final ArrayList<Table> needs = new ArrayList<Table>();
+
−
+
−	Table(final String schem, final String name, final String type) {
+
−		this.schem = schem;
+
−		this.name = name;
+
−		this.type = type;
+
−		this.fqname = schem + "." + name;
+
−	}
+
−
+
−	void addDependency(final Table dependsOn) throws Exception {
+
−		if (this.fqname.equals(dependsOn.fqname))
+
−			throw new Exception("Cyclic dependency graphs are not supported (foreign key relation references self)");
+
−
+
−		if (dependsOn.needs.contains(this))
+
−			throw new Exception("Cyclic dependency graphs are not supported (foreign key relation a->b and b->a)");
+
−
+
−		if (!needs.contains(dependsOn))
+
−			needs.add(dependsOn);
+
−	}
+
−
+
−	List<Table> requires(final List<Table> existingTables) {
+
−		if (existingTables == null || existingTables.isEmpty())
+
−			return new ArrayList<Table>(needs);
+
−
+
−		final ArrayList<Table> req = new ArrayList<Table>();
+
−		for (Table n : needs) {
+
−			if (!existingTables.contains(n))
+
−				req.add(n);
+
−		}
+
−
+
−		return req;
+
−	}
+
−
+
−	final String getSchem() {
+
−		return schem;
+
−	}
+
−
+
−	final String getName() {
+
−		return name;
+
−	}
+
−
+
−	final String getType() {
+
−		return type;
+
−	}
+
−
+
−	final String getFqname() {
+
−		return fqname;
+
−	}
+
−
+
−	final String getFqnameQ() {
+
−		return JdbcClient.dq(schem) + "." + JdbcClient.dq(name);
+
−	}
+
−
+
−	public final String toString() {
+
−		return fqname;
+
−	}
+
−
+
−	static final Table findTable(final String schname, final String tblname, final List<Table> list) {
+
−		for (Table t : list) {
+
−			if (t.schem.equals(schname) && t.name.equals(tblname))
+
−				return t;
+
−		}
+
−		// not found
+
−		return null;
+
−	}
+
−
+
−	static final void checkForLoop(final Table table, final List<Table> parents) throws Exception {
+
−		parents.add(table);
+
−		for (int i = 0; i < table.needs.size(); i++) {
+
−			Table child = table.needs.get(i);
+
−			if (parents.contains(child))
+
−				throw new Exception("Cyclic dependency graphs are not supported (cycle detected for " + child.fqname + ")");
+
−			checkForLoop(child, parents);
+
−		}
+
−	}
+
−}