com.blazebit.persistence.impl.dialect.HSQLDbmsDialect Maven / Gradle / Ivy
/*
* Copyright 2014 - 2023 Blazebit.
*
* 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 com.blazebit.persistence.impl.dialect;
import java.util.Map;
import com.blazebit.persistence.spi.DbmsModificationState;
import com.blazebit.persistence.spi.DbmsStatementType;
import com.blazebit.persistence.spi.DeleteJoinStyle;
import com.blazebit.persistence.spi.LateralStyle;
import com.blazebit.persistence.spi.UpdateJoinStyle;
import com.blazebit.persistence.spi.ValuesStrategy;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class HSQLDbmsDialect extends DefaultDbmsDialect {
public HSQLDbmsDialect() {
}
public HSQLDbmsDialect(Map, String> childSqlTypes) {
super(childSqlTypes);
}
@Override
public boolean supportsReturningColumns() {
return true;
}
@Override
public boolean supportsWindowFunctions() {
return false;
}
@Override
public ValuesStrategy getValuesStrategy() {
// NOTE: this is only supported in HSQL 2.0+
return ValuesStrategy.VALUES;
}
@Override
public boolean needsUniqueSelectItemNamesAlsoWhenTableColumnAliasing() {
return false;
}
@Override
public boolean isNullSmallest() {
// Actually, HSQLDB always shows NULL first, regardless of the ordering, but we don't care because it supports null precedence handling
return true;
}
@Override
public LateralStyle getLateralStyle() {
return LateralStyle.NONE;
}
@Override
public DeleteJoinStyle getDeleteJoinStyle() {
return DeleteJoinStyle.MERGE;
}
@Override
public UpdateJoinStyle getUpdateJoinStyle() {
return UpdateJoinStyle.MERGE;
}
@Override
public Map appendExtendedSql(StringBuilder sqlSb, DbmsStatementType statementType, boolean isSubquery, boolean isEmbedded, StringBuilder withClause, String limit, String offset, String dmlAffectedTable, String[] returningColumns, Map includedModificationStates) {
if (isSubquery && returningColumns != null) {
throw new IllegalArgumentException("Returning columns in a subquery is not possible for this dbms!");
}
return super.appendExtendedSql(sqlSb, statementType, isSubquery, isEmbedded, withClause, limit, offset, dmlAffectedTable, returningColumns, includedModificationStates);
}
}