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/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// Nov 5, 2013-2.5 Chris Delahunt
// - 421109: DB2 AS400 doesn't support "USE AND KEEP UPDATE LOCKS" used for pessimistic locking
// 04/30/2015 - Will Dazey
// - 465063 : Added National Character support for DB2 on I
package org.eclipse.persistence.platform.database;
import java.util.Hashtable;
import org.eclipse.persistence.expressions.ExpressionOperator;
import org.eclipse.persistence.internal.databaseaccess.FieldTypeDefinition;
/**
* <b>Purpose</b>: Provides DB2 Mainframe specific behavior.<p>
* This provides for some additional compatibility in certain DB2 versions on OS390.
* <b>Responsibilities</b>:
* <ul>
* <li>Specialized CONCAT syntax
* </ul>
*
* @since TopLink 3.0.3
*/
public class DB2MainframePlatform extends DB2Platform {
public DB2MainframePlatform() {
super();
this.pingSQL = "SELECT COUNT(*) from SYSIBM.SYSDUMMY1 WHERE 1 = 0";
}
/**
* Initialize any platform-specific operators
*/
@Override
protected void initializePlatformOperators() {
super.initializePlatformOperators();
addOperator(ExpressionOperator.simpleLogicalNoParens(ExpressionOperator.Concat, "CONCAT"));
}
/**
* INTERNAL:
* Used for pessimistic locking in DB2.
* Without the "WITH RS" the lock is not held.
* AS/400 does not support UPDATE type lock, so EXCLUSIVE is used instead.
*/
@Override
public String getSelectForUpdateString() {
return " FOR READ ONLY WITH RS USE AND KEEP EXCLUSIVE LOCKS";
}
/**
* INTERNAL:
* Return if brackets can be used in the ON clause for outer joins.
* Some DB2 versions on OS390 do not allow this.
*/
@Override
public boolean supportsOuterJoinsWithBrackets() {
return false;
}
@Override
protected Hashtable buildFieldTypes() {
Hashtable<Class<?>, Object> res = super.buildFieldTypes();
if (getUseNationalCharacterVaryingTypeForString()) {
res.put(String.class, new FieldTypeDefinition("VARCHAR", DEFAULT_VARCHAR_SIZE));
}
return res;
}
@Override
public String getTableCreationSuffix() {
// If we're on I and using unicode support we need to append CCSID
// on the table rather than FOR MIXED DATA on each column
if (getUseNationalCharacterVaryingTypeForString()) {
return " CCSID";
}
return super.getTableCreationSuffix();
}
}
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