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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
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package org.apache.cayenne.access.jdbc;
import java.sql.Connection;
import java.sql.SQLException;
import org.apache.cayenne.access.OperationObserver;
import org.apache.cayenne.dba.JdbcAdapter;
import org.apache.cayenne.ejbql.EJBQLBaseVisitor;
import org.apache.cayenne.ejbql.EJBQLCompiledExpression;
import org.apache.cayenne.ejbql.EJBQLExpression;
import org.apache.cayenne.ejbql.EJBQLExpressionVisitor;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.query.EJBQLQuery;
import org.apache.cayenne.query.QueryMetadata;
import org.apache.cayenne.query.SQLActionVisitor;
import org.apache.cayenne.query.SQLTemplate;
/**
* Parses an EJBQL statement, converting it to SQL. Executes the resulting SQL.
*
* @since 3.0
*/
public class EJBQLAction extends BaseSQLAction {
protected SQLActionVisitor actionFactory;
protected EJBQLQuery query;
public EJBQLAction(EJBQLQuery query, SQLActionVisitor actionFactory,
JdbcAdapter adapter, EntityResolver entityResolver) {
super(adapter, entityResolver);
this.query = query;
this.actionFactory = actionFactory;
}
public void performAction(Connection connection, OperationObserver observer)
throws SQLException, Exception {
EJBQLCompiledExpression compiledExpression = query
.getExpression(getEntityResolver());
final EJBQLTranslatorFactory translatorFactory = ((JdbcAdapter) getAdapter())
.getEjbqlTranslatorFactory();
final EJBQLTranslationContext context = new EJBQLTranslationContext(
entityResolver,
compiledExpression,
query.getParameters(),
translatorFactory);
compiledExpression.getExpression().visit(new EJBQLBaseVisitor(false) {
@Override
public boolean visitSelect(EJBQLExpression expression) {
EJBQLExpressionVisitor visitor = translatorFactory
.getSelectTranslator(context);
expression.visit(visitor);
return false;
}
@Override
public boolean visitDelete(EJBQLExpression expression) {
EJBQLExpressionVisitor visitor = translatorFactory
.getDeleteTranslator(context);
expression.visit(visitor);
return false;
}
@Override
public boolean visitUpdate(EJBQLExpression expression) {
EJBQLExpressionVisitor visitor = translatorFactory
.getUpdateTranslator(context);
expression.visit(visitor);
return false;
}
});
SQLTemplate sqlQuery = context.getQuery();
// update with metadata
QueryMetadata md = query.getMetaData(getEntityResolver());
sqlQuery.setFetchLimit(md.getFetchLimit());
sqlQuery.setFetchOffset(md.getFetchOffset());
actionFactory.sqlAction(sqlQuery).performAction(connection, observer);
}
}