/*
* Copyright 2004-2015 the Seasar Foundation and the Others.
*
* Licensed 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.seasar.extension.jdbc.id;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.persistence.GenerationType;
import javax.persistence.SequenceGenerator;
import org.seasar.extension.jdbc.EntityMeta;
import org.seasar.extension.jdbc.JdbcContext;
import org.seasar.extension.jdbc.PropertyMeta;
import org.seasar.extension.jdbc.SqlLogger;
import org.seasar.extension.jdbc.manager.JdbcManagerImplementor;
import org.seasar.framework.util.PreparedStatementUtil;
import org.seasar.framework.util.ResultSetUtil;
import org.seasar.framework.util.StringUtil;
/**
* {@link GenerationType#SEQUENCE}方式で識別子の値を自動生成するIDジェネレータです。
*
* @author koichik
*/
public class SequenceIdGenerator extends AbstractPreAllocateIdGenerator {
/** シーケンスの名前 */
protected String sequenceName;
/**
* インスタンスを構築します。
*
* @param entityMeta
* エンティティのメタデータ
* @param propertyMeta
* 識別子を表すプロパティのメタデータ
* @param sequenceGenerator
* 識別子に付けられたアノテーション
*/
public SequenceIdGenerator(final EntityMeta entityMeta,
final PropertyMeta propertyMeta,
final SequenceGenerator sequenceGenerator) {
super(entityMeta, propertyMeta, sequenceGenerator.allocationSize());
sequenceName = getSequenceName(sequenceGenerator);
}
@Override
protected long getNewInitialValue(final JdbcManagerImplementor jdbcManager,
final SqlLogger sqlLogger) {
final String sql = jdbcManager.getDialect().getSequenceNextValString(
sequenceName, (int) allocationSize);
sqlLogger.logSql(sql);
final JdbcContext jdbcContext = jdbcManager.getJdbcContext();
try {
final PreparedStatement ps = jdbcContext.getPreparedStatement(sql);
final ResultSet rs = PreparedStatementUtil.executeQuery(ps);
try {
return getGeneratedId(rs);
} finally {
ResultSetUtil.close(rs);
}
} finally {
if (!jdbcContext.isTransactional()) {
jdbcContext.destroy();
}
}
}
/**
* シーケンスの名前を返します。
*
* @param sequenceGenerator
* 識別子に付けられたアノテーション
* @return シーケンスの名前
*/
protected String getSequenceName(final SequenceGenerator sequenceGenerator) {
final String sequenceName = sequenceGenerator.sequenceName();
if (!StringUtil.isEmpty(sequenceName)) {
return sequenceName;
}
return entityMeta.getTableMeta().getName() + "_"
+ propertyMeta.getColumnMeta().getName();
}
}