+
−/*
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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
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− * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
− *
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− * Copyright 1997 - July 2008 CWI, August 2008 - 2017 MonetDB B.V.
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− */
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−
+
−import java.sql.*;
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−import java.util.*;
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−
+
−public class Test_PSmanycon {
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−	public static void main(String[] args) throws Exception {
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−		// Class.forName("nl.cwi.monetdb.jdbc.MonetDriver");	// not needed anymore for self registering JDBC drivers
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−		List<PreparedStatement> pss = new ArrayList<>(100);	// PreparedStatements go in here
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−
+
−		try {
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−			// spawn a lot of Connections with 1 PreparedStatement, just for fun...
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−			int i;
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−			for (i = 0; i < 50; i++) {
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−				System.out.print("Establishing Connection " + i + "...");
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−				Connection con = DriverManager.getConnection(args[0]);
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−				System.out.print(" done...");
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−
+
−				// do something with the connection to test if it works
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−				PreparedStatement pstmt = con.prepareStatement("select " + i);
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−				System.out.println(" alive");
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−
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−				pss.add(pstmt);
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−			}
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−
+
−			// now try to nicely execute them
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−			i = 0;
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−			for (Iterator<PreparedStatement> it = pss.iterator(); it.hasNext(); i++) {
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−				PreparedStatement pstmt = it.next();
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−
+
−				// see if the connection still works
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−				System.out.print("Executing PreparedStatement " + i + "...");
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−				if (!pstmt.execute())
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−					throw new Exception("should have seen a ResultSet!");
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−
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−				ResultSet rs = pstmt.getResultSet();
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−				if (!rs.next())
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−					throw new Exception("ResultSet is empty");
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−				System.out.print(" result: " + rs.getString(1));
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−
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−				// close the connection and associated resources
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−				pstmt.getConnection().close();
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−				System.out.println(", done");
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−
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−				if ((i + 1) % 23 == 0) {
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−					// inject a failed transaction
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−					Connection con = DriverManager.getConnection(args[0]);
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−					Statement stmt = con.createStatement();
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−					try {
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−						stmt.executeUpdate("update foo where bar is wrong");
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−						System.out.println("oops, faulty statement just got through :(");
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−					} catch (SQLException e) {
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−						System.out.println("Forced transaction failure");
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−					}
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−				}
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−			}
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−		} catch (SQLException e) {
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−			System.out.println("FAILED! " + e.getMessage());
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−		}
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−	}
+
−}