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/*
* Class org.apache.derbyTesting.functionTests.tests.lang.LikeTest
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.derbyTesting.functionTests.tests.lang;
import java.sql.SQLException;
import java.sql.Statement;
import junit.framework.Test;
import org.apache.derbyTesting.junit.BaseJDBCTestCase;
import org.apache.derbyTesting.junit.JDBC;
import org.apache.derbyTesting.junit.SQLUtilities;
import org.apache.derbyTesting.junit.TestConfiguration;
/**
* Tests for statements with a LIKE clause.
*/
public class LikeTest extends BaseJDBCTestCase {
public LikeTest(String name) {
super(name);
}
public static Test suite() {
return TestConfiguration.defaultSuite(LikeTest.class);
}
/**
* Test that LIKE expressions are optimized and use indexes to limit the
* scan if the arguments are concatenated string literals. DERBY-4791.
*/
public void testOptimizeConcatenatedStringLiterals() throws SQLException {
setAutoCommit(false);
Statement s = createStatement();
s.execute("create table t (x varchar(128) primary key, y int)");
s.execute("insert into t(x) values " +
"'abc', 'def', 'ghi', 'ab', 'de', 'gh'");
s.execute("call SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1)");
// Check that an optimizable LIKE predicate (one that doesn't begin
// with a wildcard) with a string literal picks an index scan.
String[][] expectedRows = { {"ab", null}, {"abc", null} };
JDBC.assertUnorderedResultSet(
s.executeQuery("select * from t where x like 'ab%'"),
expectedRows);
assertTrue(SQLUtilities.getRuntimeStatisticsParser(s).usedIndexScan());
// Now do the same test, but concatenate two string literals instead
// of using a single string literal. This should be optimized the
// same way.
JDBC.assertUnorderedResultSet(
s.executeQuery("select * from t where x like 'a'||'b'||'%'"),
expectedRows);
assertTrue(SQLUtilities.getRuntimeStatisticsParser(s).usedIndexScan());
}
public void testDerby6477() throws SQLException {
// DERBY-6477: This statement used to fail with an OutOfMemoryError.
JDBC.assertSingleValueResultSet(createStatement().executeQuery(
"select javaclassname from sys.sysaliases where "
+ "javaclassname like "
+ "'org.apache.derby.catalog.Java5SystemProcedures%'"),
"org.apache.derby.catalog.Java5SystemProcedures");
}
}
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