+
−/*
+
− * SPDX-License-Identifier: MPL-2.0
+
− *
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− * This Source Code Form is subject to the terms of the Mozilla Public
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− * 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/.
+
− *
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− * Copyright 2024, 2025 MonetDB Foundation;
+
− * Copyright August 2008 - 2023 MonetDB B.V.;
+
− * Copyright 1997 - July 2008 CWI.
+
− */
+
−
+
−import java.sql.*;
+
−import java.util.*;
+
−import org.monetdb.mcl.net.MapiSocket;
+
−import org.monetdb.mcl.io.BufferedMCLReader;
+
−import org.monetdb.mcl.io.BufferedMCLWriter;
+
−
+
−/**
+
− * This program demonstrates how the MonetDB JDBC driver can facilitate
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− * in performing COPY INTO ... FROM STDIN sequences.
+
− * It shows how a data stream via MapiSocket to STDIN can be performed.
+
− *
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− * @author Fabian Groffen, Martin van Dinther
+
− */
+
−
+
−public final class SQLcopyinto {
+
−	final private static String tablenm = "exampleSQLCopyInto";
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−
+
−	public static void main(String[] args) throws Exception {
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−		System.out.println("SQLcopyinto started");
+
−		if (args.length == 0) {
+
−			System.err.println("Error: missing startup argument: the jdbc connection url !");
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−			System.err.println("Usage: java -cp monetdb-jdbc-3.0.jre8.jar:. SQLcopyinto \"jdbc:monetdb://localhost:50000/demo?user=monetdb&password=monetdb\"");
+
−			System.exit(-1);
+
−		}
+
−		String jdbc_url = args[0];
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−
+
−		// request a connection to MonetDB server via the driver manager
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−		Connection conn = DriverManager.getConnection(jdbc_url);
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−		System.out.println("Connected to MonetDB server");
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−
+
−		Statement stmt = null;
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−		ResultSet rs = null;
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−		try {
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−			stmt = conn.createStatement();
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−			stmt.execute("CREATE TABLE IF NOT EXISTS " + tablenm + " (id int, val varchar(24))");
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−
+
−			fillTableUsingCopyIntoSTDIN(conn);
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−
+
−			// check content of the table populated via COPY INTO ... FROM STDIN
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−			System.out.println("Listing uploaded data:");
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−			rs = stmt.executeQuery("SELECT * FROM " + tablenm);
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−			if (rs != null) {
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−				while (rs.next()) {
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−					System.out.println("Row data: " + rs.getString(1) + ", " + rs.getString(2));
+
−				}
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−				rs.close();
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−				rs = null;
+
−			}
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−
+
−			stmt.execute("DROP TABLE " + tablenm);
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−
+
−			System.out.println("SQLcopyinto completed");
+
−		} catch (SQLException e) {
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−			System.err.println("SQLException: " + e.getMessage());
+
−		} catch (Exception e) {
+
−			System.err.println("Exception: " + e.getMessage());
+
−		} finally {
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−			// free resources
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−			if (rs != null)
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−				rs.close();
+
−			if (stmt != null)
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−				stmt.close();
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−			// close the JDBC connection to MonetDB server
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−			if (conn != null)
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−				conn.close();
+
−		}
+
−	}
+
−
+
−	public static void fillTableUsingCopyIntoSTDIN(Connection mcon) throws Exception {
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−		System.out.println();
+
−		System.out.println("CopyInto STDIN begin");
+
−
+
−		MapiSocket server = new MapiSocket();
+
−		try {
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−			server.setLanguage("sql");
+
−
+
−			// extract from MonetConnection object the used connection properties
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−			String host = mcon.getClientInfo("host");
+
−			int port = Integer.parseInt(mcon.getClientInfo("port"));
+
−			String login = mcon.getClientInfo("user");
+
−			String passw = mcon.getClientInfo("password");
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−			// System.out.println("host: " + host + " port: " + port + " login: " + login + " passwd: " + passw);
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−
+
−			System.out.println("Before connecting to MonetDB server via MapiSocket");
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−			List<String> warning = server.connect(host, port, login, passw);
+
−			if (warning != null) {
+
−				for (Iterator<String> it = warning.iterator(); it.hasNext(); ) {
+
−					System.out.println("Warning: " + it.next().toString());
+
−				}
+
−			}
+
−			System.out.println("Connected to MonetDB server via MapiSocket");
+
−
+
−			BufferedMCLReader mclIn = server.getReader();
+
−			BufferedMCLWriter mclOut = server.getWriter();
+
−
+
−			String error = mclIn.discardRemainder();
+
−			if (error != null)
+
−				System.err.println("Received start error: " + error);
+
−
+
−			System.out.println("Before sending data to STDIN");
+
−
+
−			// the leading 's' is essential, since it is a protocol marker
+
−			// that should not be omitted, likewise the trailing semicolon
+
−			mclOut.write('s');
+
−			mclOut.write("COPY INTO " + tablenm + " FROM STDIN USING DELIMITERS ',',E'\\n';");
+
−			mclOut.newLine();
+
−			// now write the row data values as csv data lines to the STDIN stream
+
−			for (int i = 0; i < 40; i++) {
+
−				mclOut.write("" + i + ",val_" + i);
+
−				mclOut.newLine();
+
−			}
+
−
+
−			mclOut.writeLine(""); // need this one for synchronisation over flush()
+
−			error = mclIn.discardRemainder();
+
−			if (error != null)
+
−				System.err.println("Received error: " + error);
+
−
+
−			mclOut.writeLine(""); // need this one for synchronisation over flush()
+
−			error = mclIn.discardRemainder();
+
−			if (error != null)
+
−				System.err.println("Received finish error: " + error);
+
−
+
−			System.out.println("Completed sending data via STDIN");
+
−		} catch (Exception e) {
+
−			System.err.println("Mapi Exception: " + e.getMessage());
+
−		} finally {
+
−			// close MapiSocket connection to MonetDB server
+
−			server.close();
+
−		}
+
−
+
−		System.out.println("CopyInto STDIN end");
+
−		System.out.println();
+
−	}
+
−}