HSQLDB example source code file (TestCascade.java)

This example HSQLDB source code file (TestCascade.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - HSQLDB tags/keywords

altlcnxb, ca, ca, eiacodxa, insert, insert, into, into, io, jdbc, lsaconxb, not, null, sql, varchar, varchar, xb

The HSQLDB TestCascade.java source code

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb.test;

/*
 * CascadeDeleteBug.java
 *
 * Created on June 24, 2002, 8:48 AM
 */
import java.io.File;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import junit.framework.TestCase;

import org.hsqldb.jdbc.jdbcDataSource;

/**
 * Test case to demonstrate catastrophic bug in cascade delete code.
 *
 * @version 1.0
 * @author  David Kopp
 */
public class TestCascade extends TestCase {

    Connection con;

    public TestCascade(String name) {
        super(name);
    }

    protected void setUp() {

        try {
            createDatabase();

            jdbcDataSource dataSource = new jdbcDataSource();

            dataSource.setDatabase("jdbc:hsqldb:testdb");

            con = dataSource.getConnection("sa", "");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(this + ".setUp() error: " + e.getMessage());
        }
    }

    protected void tearDown() {

        try {
            con.close();
        } catch (SQLException e) {}
    }

    public void testDelete() {

        try {
            insertData(con);

            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT COUNT(EIACODXA) FROM CA");

            rs.next();

            int origCount = rs.getInt(1);

            rs.close();
            deleteXBRecord(con);

            rs = stmt.executeQuery("SELECT COUNT(EIACODXA) FROM CA");

            rs.next();

            int newCount = rs.getInt(1);

            rs.close();
            stmt.close();
            assertEquals(9, newCount);
        } catch (SQLException e) {
            this.assertTrue("SQLException thrown", false);
        }
    }

    private static void createDatabase() throws SQLException {

        new File("testdb.backup").delete();
        new File("testdb.data").delete();
        new File("testdb.properties").delete();
        new File("testdb.script").delete();

        jdbcDataSource dataSource = new jdbcDataSource();

        dataSource.setDatabase("jdbc:hsqldb:testdb");

        Connection con   = dataSource.getConnection("sa", "");
        String[]   saDDL = {
            "CREATE CACHED TABLE XB (EIACODXA VARCHAR(10) NOT NULL, LSACONXB VARCHAR(18) NOT NULL, ALTLCNXB VARCHAR(2) NOT NULL, LCNTYPXB VARCHAR(1) NOT NULL, LCNINDXB VARCHAR(1), LCNAMEXB VARCHAR(19), UPDT_BY VARCHAR(32), LST_UPDT TIMESTAMP, CONSTRAINT XPKXB PRIMARY KEY (EIACODXA, LSACONXB, ALTLCNXB, LCNTYPXB));",

//            "CREATE INDEX XIF2XB ON XB (EIACODXA);",
            "CREATE CACHED TABLE CA ( EIACODXA VARCHAR(10) NOT NULL, LSACONXB VARCHAR(18) NOT NULL, ALTLCNXB VARCHAR(2) NOT NULL, LCNTYPXB VARCHAR(1) NOT NULL, TASKCDCA VARCHAR(7) NOT NULL, TSKFRQCA NUMERIC(7,4), UPDT_BY VARCHAR(32), LST_UPDT TIMESTAMP, CONSTRAINT XPKCA PRIMARY KEY (EIACODXA, LSACONXB, ALTLCNXB, LCNTYPXB, TASKCDCA),        CONSTRAINT R_XB_CA FOREIGN KEY (EIACODXA, LSACONXB, ALTLCNXB, LCNTYPXB) REFERENCES XB ON DELETE CASCADE);",

//            "CREATE INDEX XIF26CA ON CA ( EIACODXA, LSACONXB, ALTLCNXB, LCNTYPXB);"
        };
        Statement stmt = con.createStatement();

        for (int index = 0; index < saDDL.length; index++) {
            stmt.executeUpdate(saDDL[index]);
        }

        stmt.execute("SHUTDOWN");
        con.close();
    }    // createDatabase

    /**
     * This method demonstrates the bug in cascading deletes. Before this method,
     * the CA table has 12 records. After, it should have 9, but instead it has
     * 0.
     */
    private static void deleteXBRecord(Connection con) throws SQLException {

        Statement stmt = con.createStatement();

        stmt.executeUpdate(
            "DELETE FROM XB WHERE LSACONXB = 'LEAA' AND EIACODXA = 'T850' AND LCNTYPXB = 'P' AND ALTLCNXB = '00'");
        stmt.close();
    }    // deleteXBRecord

    private static void insertData(Connection con) throws SQLException {

        String[] saData = {
            "INSERT INTO XB VALUES('T850','LEAA','00','P',NULL,'LCN NAME','sa',NOW)",
            "INSERT INTO XB VALUES('T850','LEAA01','00','P',NULL,'LCN NAME','sa',NOW)",
            "INSERT INTO XB VALUES('T850','LEAA02','00','P',NULL,'LCN NAME','sa',NOW)",
            "INSERT INTO XB VALUES('T850','LEAA03','00','P',NULL,'LCN NAME','sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA','00','P','ABCDEFG',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA','00','P','QRSTUJV',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA','00','P','ZZZZZZZ',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA01','00','P','ABCDEFG',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA01','00','P','QRSTUJV',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA01','00','P','ZZZZZZZ',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA02','00','P','ABCDEFG',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA02','00','P','QRSTUJV',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA02','00','P','ZZZZZZZ',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA03','00','P','ABCDEFG',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA03','00','P','QRSTUJV',3.14,'sa',NOW)",
            "INSERT INTO CA VALUES('T850','LEAA03','00','P','ZZZZZZZ',3.14,'sa',NOW)"
        };
        Statement stmt = con.createStatement();

        for (int index = 0; index < saData.length; index++) {
            stmt.executeUpdate(saData[index]);
        }
    }    // insertData
}