/*
* 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.dialect;
import javax.persistence.GenerationType;
/**
* Firebird用の方言をあつかうクラスです。
*
* @author higa
*
*/
public class FirebirdDialect extends StandardDialect {
@Override
public String getName() {
return "firebird";
}
@Override
public boolean supportsLimit() {
return true;
}
@Override
public String convertLimitSql(String sql, int offset, int limit) {
StringBuilder buf = new StringBuilder(sql.length() + 20);
String lowerSql = sql.toLowerCase();
int startOfSelect = lowerSql.indexOf("select");
buf.append(sql.substring(0, startOfSelect + 6));
if (offset > 0) {
buf.append(" first ");
buf.append(offset + limit);
buf.append(" skip ");
buf.append(offset);
} else {
buf.append(" first ");
buf.append(limit);
}
buf.append(sql.substring(startOfSelect + 6));
return buf.toString();
}
@Override
public GenerationType getDefaultGenerationType() {
return GenerationType.SEQUENCE;
}
@Override
public boolean supportsSequence() {
return true;
}
@Override
public String getSequenceNextValString(final String sequenceName,
final int allocationSize) {
return "select gen_id( " + sequenceName + ", " + allocationSize
+ " ) from RDB$DATABASE";
}
}