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/*
* Copyright 2014 - 2019 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.query;
import com.blazebit.persistence.impl.AbstractCommonQueryBuilder;
import com.blazebit.persistence.impl.util.SqlUtils;
import com.blazebit.persistence.spi.DbmsModificationState;
import javax.persistence.Parameter;
import javax.persistence.Query;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
*
* @author Christian Beikov
* @since 1.2.0
*/
public class CollectionDeleteModificationQuerySpecification extends ModificationQuerySpecification {
public static final String COLLECTION_BASE_QUERY_ALIAS = "_collection";
private final Query deleteExampleQuery;
private final String deleteSql;
private final Map columnExpressionRemappings;
public CollectionDeleteModificationQuerySpecification(AbstractCommonQueryBuilder commonQueryBuilder, Query baseQuery, Query exampleQuery, Set> parameters, Set parameterListNames, boolean recursive, List ctes, boolean shouldRenderCteNodes,
boolean isEmbedded, String[] returningColumns, Map includedModificationStates, Map returningAttributeBindingMap, Query deleteExampleQuery, String deleteSql, Map columnExpressionRemappings) {
super(commonQueryBuilder, baseQuery, exampleQuery, parameters, parameterListNames, recursive, ctes, shouldRenderCteNodes, isEmbedded, returningColumns, includedModificationStates, returningAttributeBindingMap);
this.deleteExampleQuery = deleteExampleQuery;
this.deleteSql = deleteSql;
this.columnExpressionRemappings = columnExpressionRemappings;
}
@Override
protected void initialize() {
List participatingQueries = new ArrayList();
for (Map.Entry> entry : listParameters.entrySet()) {
baseQuery.setParameter(entry.getKey(), entry.getValue());
}
StringBuilder sqlSb = new StringBuilder(extendedQuerySupport.getSql(em, baseQuery));
// Replace the "select ... from ..." part of the base query by the "delete from collectionTable" part
int whereIndex = SqlUtils.indexOfWhere(sqlSb);
if (whereIndex == -1) {
sqlSb.setLength(0);
sqlSb.append(deleteSql);
} else {
sqlSb.replace(0, whereIndex, deleteSql);
}
remapColumnExpressions(sqlSb, columnExpressionRemappings);
StringBuilder withClause = applyCtes(sqlSb, baseQuery, participatingQueries);
// NOTE: CTEs will only be added, if this is a subquery
Map addedCtes = applyExtendedSql(sqlSb, false, isEmbedded, withClause, returningColumns, includedModificationStates);
participatingQueries.add(baseQuery);
// Some dbms like DB2 will need to wrap modification queries in select queries when using CTEs
boolean hasCtes = withClause != null && withClause.length() != 0 || addedCtes != null && !addedCtes.isEmpty();
if (hasCtes && returningAttributeBindingMap.isEmpty() && !dbmsDialect.usesExecuteUpdateWhenWithClauseInModificationQuery()) {
query = exampleQuery;
} else {
query = deleteExampleQuery;
}
this.sql = sqlSb.toString();
this.participatingQueries = participatingQueries;
this.addedCtes = addedCtes;
this.dirty = false;
}
}