/*
* 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 java.util.Arrays;
import java.util.Set;
import javax.persistence.GenerationType;
import org.seasar.framework.util.tiger.CollectionsUtil;
/**
* MySQL用の方言をあつかうクラスです。
*
* @author higa
*
*/
public class MysqlDialect extends StandardDialect {
/**
* 一意制約違反を表す例外コード
*/
protected static final Set<Integer> uniqueConstraintViolationCode = CollectionsUtil
.newHashSet(Arrays.asList(1022, 1062));
@Override
public String getName() {
return "mysql";
}
@Override
public boolean supportsLimit() {
return true;
}
@Override
public boolean supportsOffsetWithoutLimit() {
return false;
}
@Override
public String convertLimitSql(String sql, int offset, int limit) {
StringBuilder buf = new StringBuilder(sql.length() + 20);
buf.append(sql);
if (offset > 0 && limit > 0) {
buf.append(" limit ");
buf.append(offset);
buf.append(", ");
buf.append(limit);
} else if (offset == 0 && limit > 0) {
buf.append(" limit ");
buf.append(limit);
} else if (offset > 0 && limit == 0) {
throw new IllegalArgumentException("limit is zero");
}
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 isUniqueConstraintViolation(Throwable t) {
final Integer code = getErrorCode(t);
if (code != null) {
return uniqueConstraintViolationCode.contains(code);
}
return false;
}
}