HSQLDB example source code file (TestLikePredicateOptimizations.java)

This example HSQLDB source code file (TestLikePredicateOptimizations.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

col, col, exception, from, jdbc, like, like, select, sql, string, string, testcase, testlikepredicateoptimizations, testlikepredicateoptimizations, testresult, where

The HSQLDB TestLikePredicateOptimizations.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,
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package org.hsqldb.test;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;

import junit.framework.TestCase;
import junit.framework.TestResult;

/**
 * HSQLDB TestLikePredicate Junit test case. <p>
 *
 * @author  boucherb@users
 * @version 1.7.2
 * @since 1.7.2
 */
public class TestLikePredicateOptimizations extends TestBase {

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

    /* Implements the TestLikePredicate test */
    public void test() throws Exception {

        Connection        conn = newConnection();
        Statement         stmt = conn.createStatement();
        PreparedStatement pstmt;
        ResultSet         rs;
        String            sql;
        int               expectedCount;
        int               actualCount;

        stmt.execute("drop table test if exists");

        sql = "create table test(name varchar(255))";

        stmt.execute(sql);

        sql   = "insert into test values(?)";
        pstmt = conn.prepareStatement(sql);

        for (int i = 0; i < 10000; i++) {
            pstmt.setString(1, "name" + i);
            pstmt.addBatch();
        }

        pstmt.executeBatch();

        sql = "select count(*) from test where name = null";
        rs  = stmt.executeQuery(sql);

        rs.next();

        expectedCount = rs.getInt(1);
        sql           = "select count(*) from test where name like null";
        pstmt         = conn.prepareStatement(sql);
        rs            = pstmt.executeQuery();

        rs.next();

        actualCount = rs.getInt(1);

        assertEquals("\"" + sql + "\"", expectedCount, actualCount);

// --
        sql = "select count(*) from test where name = ''";
        rs  = stmt.executeQuery(sql);

        rs.next();

        expectedCount = rs.getInt(1);
        sql           = "select count(*) from test where name like ''";
        pstmt         = conn.prepareStatement(sql);
        rs            = pstmt.executeQuery();

        rs.next();

        actualCount = rs.getInt(1);

        assertEquals("\"" + sql + "\"", expectedCount, actualCount);

// --
        sql = "select count(*) from test where name is not null";
        rs  = stmt.executeQuery(sql);

        rs.next();

        expectedCount = rs.getInt(1);
        sql           = "select count(*) from test where name like '%'";
        pstmt         = conn.prepareStatement(sql);
        rs            = pstmt.executeQuery();

        rs.next();

        actualCount = rs.getInt(1);

        assertEquals("\"" + sql + "\"", expectedCount, actualCount);

// --
        sql = "select count(*) from test where left(name, 6) = 'name44'";
        rs  = stmt.executeQuery(sql);

        rs.next();

        expectedCount = rs.getInt(1);
        sql           = "select count(*) from test where name like 'name44%'";
        pstmt         = conn.prepareStatement(sql);
        rs            = pstmt.executeQuery();

        rs.next();

        actualCount = rs.getInt(1);

        assertEquals("\"" + sql + "\"", expectedCount, actualCount);

// --
        sql = "select count(*) from test where left(name,5) = 'name4' and right(name,1) = 5";
        rs = stmt.executeQuery(sql);

        rs.next();

        expectedCount = rs.getInt(1);
        sql           = "select count(*) from test where name like 'name4%5'";
        pstmt         = conn.prepareStatement(sql);
        rs            = pstmt.executeQuery();

        rs.next();

        actualCount = rs.getInt(1);

        assertEquals("\"" + sql + "\"", expectedCount, actualCount);

// --
        stmt.execute("drop table test1 if exists");

        sql   = "CREATE TABLE test1 (col VARCHAR(30))";
        pstmt = conn.prepareStatement(sql);

        pstmt.execute();

        sql   = "INSERT INTO test1 (col) VALUES ('one')";
        pstmt = conn.prepareStatement(sql);

        pstmt.execute();

        sql   = "SELECT * FROM test1 WHERE ( col LIKE ? )";
        pstmt = conn.prepareStatement(sql);

        pstmt.setString(1, "one");

        rs = pstmt.executeQuery();

        rs.next();

        String presult = rs.getString("COL");

        sql   = "SELECT * FROM test1 WHERE ( col LIKE 'one' )";
        pstmt = conn.prepareStatement(sql);
        rs    = pstmt.executeQuery();

        rs.next();

        String result = rs.getString("COL");

        assertEquals("\"" + sql + "\"", result, presult);
    }

    /* Runs TestLikePredicate test from the command line*/
    public static void main(String[] args) throws Exception {

        TestResult            result;
        TestCase              test;
        java.util.Enumeration failures;
        int                   count;

        result = new TestResult();
        test   = new TestLikePredicateOptimizations("test");

        test.run(result);

        count = result.failureCount();

        System.out.println("TestLikePredicateOptimizations failure count: "
                           + count);

        failures = result.failures();

        while (failures.hasMoreElements()) {
            System.out.println(failures.nextElement());
        }
    }
}