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/**
* Derby - Class org.apache.derbyTesting.functionTests.tests.lang.UniqueConstraintSetNullTest
*
* 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.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import junit.framework.Test;
import org.apache.derbyTesting.junit.BaseJDBCTestCase;
import org.apache.derbyTesting.junit.BaseTestSuite;
import org.apache.derbyTesting.junit.TestConfiguration;
/**
* Test unique constraint
*/
public class UniqueConstraintSetNullTest extends BaseJDBCTestCase {
/**
* Basic constructor.
*/
public UniqueConstraintSetNullTest(String name) {
super(name);
}
/**
* Returns the implemented tests.
*
* @return An instance of <code>Test</code> with the
* implemented tests to run.
*/
public static Test suite() {
BaseTestSuite suite =
new BaseTestSuite("UniqueConstraintSetNullTest");
suite.addTest(TestConfiguration.embeddedSuite(
UniqueConstraintSetNullTest.class));
return suite;
}
/**
* Create table for test cases to use.
*/
protected void setUp() throws Exception {
Statement stmt = createStatement();
stmt.executeUpdate("create table constraintest (" +
"val1 varchar (20) not null, " +
"val2 varchar (20))");
}
protected void tearDown() throws Exception {
dropTable("constraintest");
commit();
super.tearDown();
}
/**
* Test the behaviour of unique constraint after making
* column nullable.
* @throws java.lang.Exception
*/
public void testUpdateNullablity() throws Exception {
Statement stmt = createStatement();
//create constraint
stmt.executeUpdate("alter table constraintest add constraint " +
"u_con unique (val1)");
//test the constraint without setting it to nullable
PreparedStatement ps = prepareStatement("insert into " +
"constraintest (val1) values (?)");
ps.setString (1, "name1");
ps.executeUpdate();
try {
ps.setString (1, "name1");
ps.execute();
fail ("duplicate key in unique constraint!!!");
}
catch (SQLException e){
assertSQLState ("duplicate key in unique constraint",
"23505", e);
}
try {
ps.setNull(1, Types.VARCHAR);
ps.executeUpdate();
fail ("null value in not null field!!");
}
catch (SQLException e){
assertSQLState ("null value in non null field",
"23502", e);
}
stmt.executeUpdate("alter table constraintest alter column val1 null");
//should work
ps.setNull(1, Types.VARCHAR);
ps.executeUpdate();
//try another null
ps.setNull(1, Types.VARCHAR);
ps.executeUpdate();
//try a duplicate non null should fail
try {
ps.setString (1, "name1");
ps.execute();
fail ("duplicate key in unique constraint!!!");
}
catch (SQLException e){
assertSQLState ("duplicate key in unique constraint",
"23505", e);
}
//remove nulls from table and set the column back to non null
stmt.executeUpdate("delete from constraintest where val1 is null");
stmt.executeUpdate("alter table constraintest alter column " +
"val1 not null");
//try a duplicate non null key
try {
ps.setString (1, "name1");
ps.execute();
fail ("duplicate key in unique constraint!!!");
}
catch (SQLException e){
assertSQLState ("duplicate key in unique constraint",
"23505", e);
}
try {
ps.setNull(1, Types.VARCHAR);
ps.executeUpdate();
fail ("null value in not null field!!");
}
catch (SQLException e){
assertSQLState ("null value in non null field",
"23502", e);
}
}
}
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