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com.blazebit.persistence.impl.query.ModificationQuerySpecification Maven / Gradle / Ivy
/*
* Copyright 2014 - 2020 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.plan.CustomModificationQueryPlan;
import com.blazebit.persistence.impl.plan.ModificationQueryPlan;
import com.blazebit.persistence.impl.plan.SelectQueryPlan;
import com.blazebit.persistence.spi.DbmsLimitHandler;
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.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
*
* @author Christian Beikov
* @since 1.2.0
*/
public class ModificationQuerySpecification extends CustomQuerySpecification {
protected final Query exampleQuery;
protected final boolean isEmbedded;
protected final String[] returningColumns;
protected final Map includedModificationStates;
protected final Map returningAttributeBindingMap;
protected Query query;
public ModificationQuerySpecification(AbstractCommonQueryBuilder commonQueryBuilder, Query baseQuery, Query exampleQuery, Set> parameters, Set parameterListNames, boolean recursive, List ctes, boolean shouldRenderCteNodes,
boolean isEmbedded, String[] returningColumns, Map includedModificationStates, Map returningAttributeBindingMap) {
this(commonQueryBuilder, baseQuery, exampleQuery, parameters, parameterListNames, Collections.emptyList(), Collections.emptyList(), recursive, ctes, shouldRenderCteNodes, isEmbedded, returningColumns, includedModificationStates, returningAttributeBindingMap);
}
public ModificationQuerySpecification(AbstractCommonQueryBuilder commonQueryBuilder, Query baseQuery, Query exampleQuery, Set> parameters, Set parameterListNames,
List keyRestrictedLeftJoinAliases, List entityFunctionNodes, boolean recursive, List ctes, boolean shouldRenderCteNodes,
boolean isEmbedded, String[] returningColumns, Map includedModificationStates, Map returningAttributeBindingMap) {
super(commonQueryBuilder, baseQuery, parameters, parameterListNames, null, null, keyRestrictedLeftJoinAliases, entityFunctionNodes, recursive, ctes, shouldRenderCteNodes);
this.exampleQuery = exampleQuery;
this.isEmbedded = isEmbedded;
this.returningColumns = returningColumns;
this.includedModificationStates = includedModificationStates;
this.returningAttributeBindingMap = new HashMap<>(returningAttributeBindingMap);
}
@Override
public ModificationQueryPlan createModificationPlan(int firstResult, int maxResults) {
final String sql = getSql();
final String finalSql;
if (firstResult != 0 || maxResults != Integer.MAX_VALUE) {
DbmsLimitHandler limitHandler = dbmsDialect.createLimitHandler();
finalSql = limitHandler.applySqlInlined(sql, false, maxResults, firstResult);
} else {
finalSql = sql;
}
return new CustomModificationQueryPlan(extendedQuerySupport, serviceProvider, baseQuery, query, participatingQueries, finalSql);
}
@Override
public SelectQueryPlan createSelectPlan(int firstResult, int maxResults) {
throw new UnsupportedOperationException();
}
@Override
public Query getBaseQuery() {
return baseQuery;
}
@Override
protected void initialize() {
List participatingQueries = new ArrayList();
for (Map.Entry> entry : listParameters.entrySet()) {
baseQuery.setParameter(entry.getKey(), entry.getValue());
}
String sqlQuery = extendedQuerySupport.getSql(em, baseQuery);
StringBuilder sqlSb = applySqlTransformations(sqlQuery);
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 = baseQuery;
}
this.sql = sqlSb.toString();
this.participatingQueries = participatingQueries;
this.addedCtes = addedCtes;
this.dirty = false;
}
protected final void remapColumnExpressions(StringBuilder sqlSb, Map columnExpressionRemappings) {
remapColumnExpressions(sqlSb, columnExpressionRemappings, 0, sqlSb.length());
}
protected final int remapColumnExpressions(StringBuilder sqlSb, Map columnExpressionRemappings, int startIndex, int endIndex) {
// Replace usages of the owner entities id columns by the corresponding join table id columns
for (Map.Entry entry : columnExpressionRemappings.entrySet()) {
String sourceExpression = entry.getKey();
String targetExpression = entry.getValue();
if (sourceExpression.equals(targetExpression)) {
continue;
}
int index = startIndex;
while ((index = sqlSb.indexOf(sourceExpression, index)) != -1 && index < endIndex) {
sqlSb.replace(index, index + sourceExpression.length(), targetExpression);
int delta = targetExpression.length() - sourceExpression.length();
index += delta;
endIndex += delta;
}
}
return endIndex;
}
}
