/*
* 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;
import org.seasar.extension.jdbc.SelectForUpdateType;
import org.seasar.framework.util.tiger.Pair;
/**
* MS SQLServer用の方言をあつかうクラスです。
*
* @author higa
*
*/
public class MssqlDialect extends StandardDialect {
@Override
public String getName() {
return "mssql";
}
@Override
public boolean supportsLimit() {
return true;
}
@Override
public boolean supportsOffset() {
return false;
}
@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");
int endOfSelect = startOfSelect + 6;
if (" distinct".equals(lowerSql.substring(6, 15))) {
endOfSelect = startOfSelect + 15;
}
buf.append(sql.substring(0, endOfSelect));
buf.append(" top ");
buf.append(offset + limit);
buf.append(sql.substring(endOfSelect));
return buf.toString();
}
@Override
public GenerationType getDefaultGenerationType() {
return GenerationType.IDENTITY;
}
@Override
public boolean supportsIdentity() {
return true;
}
@Override
public boolean supportsGetGeneratedKeys() {
return true;
}
@Override
public boolean supportsForUpdate(final SelectForUpdateType type,
boolean withTarget) {
return type != SelectForUpdateType.WAIT;
}
@Override
public String getForUpdateString(final SelectForUpdateType type,
final int waitSeconds, final Pair<String, String>... aliases) {
return "";
}
@Override
public boolean supportsLockHint() {
return true;
}
@Override
public String getLockHintString(final SelectForUpdateType type,
final int waitSeconds) {
final StringBuilder buf = new StringBuilder(100)
.append(" with (updlock, rowlock");
if (type == SelectForUpdateType.NOWAIT) {
buf.append(", nowait");
}
buf.append(")");
return new String(buf);
}
}