/*****************************************************************
* 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.cayenne.dba.postgres;
import org.apache.cayenne.dba.JdbcAdapter;
import org.apache.cayenne.dba.oracle.OraclePkGenerator;
import org.apache.cayenne.map.DbEntity;
/**
* Default PK generator for PostgreSQL that uses sequences for PK generation.
*/
public class PostgresPkGenerator extends OraclePkGenerator {
protected PostgresPkGenerator(JdbcAdapter adapter) {
super(adapter);
}
@Override
protected String createSequenceString(DbEntity ent) {
// note that PostgreSQL 7.4 and newer supports INCREMENT BY and START WITH
// however 7.3 doesn't like BY and WITH, so using older more neutral
// syntax that works with all tested versions.
return "CREATE SEQUENCE " + sequenceName(ent) + " INCREMENT " + pkCacheSize(ent) + " START " + pkStartValue;
}
@Override
protected String selectNextValQuery(String sequenceName) {
return "SELECT nextval('" + sequenceName + "')";
}
@Override
protected String selectAllSequencesQuery() {
return "SELECT relname FROM pg_class WHERE relkind='S'";
}
}