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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.hql.ast.exec;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.engine.QueryParameters;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.exception.JDBCExceptionHelper;
import org.hibernate.hql.ast.HqlSqlWalker;
import org.hibernate.hql.ast.tree.AssignmentSpecification;
import org.hibernate.hql.ast.tree.FromElement;
import org.hibernate.hql.ast.tree.UpdateStatement;
import org.hibernate.param.ParameterSpecification;
import org.hibernate.persister.entity.Queryable;
import org.hibernate.sql.Update;
import org.hibernate.util.StringHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Implementation of MultiTableUpdateExecutor.
*
* @author Steve Ebersole
*/
public class MultiTableUpdateExecutor extends AbstractStatementExecutor {
private static final Logger log = LoggerFactory.getLogger( MultiTableUpdateExecutor.class );
private final Queryable persister;
private final String idInsertSelect;
private final String[] updates;
private final ParameterSpecification[][] hqlParameters;
public MultiTableUpdateExecutor(HqlSqlWalker walker) {
super( walker, log );
if ( !walker.getSessionFactoryHelper().getFactory().getDialect().supportsTemporaryTables() ) {
throw new HibernateException( "cannot doAfterTransactionCompletion multi-table updates using dialect not supporting temp tables" );
}
UpdateStatement updateStatement = ( UpdateStatement ) walker.getAST();
FromElement fromElement = updateStatement.getFromClause().getFromElement();
String bulkTargetAlias = fromElement.getTableAlias();
this.persister = fromElement.getQueryable();
this.idInsertSelect = generateIdInsertSelect( persister, bulkTargetAlias, updateStatement.getWhereClause() );
log.trace( "Generated ID-INSERT-SELECT SQL (multi-table update) : " + idInsertSelect );
String[] tableNames = persister.getConstraintOrderedTableNameClosure();
String[][] columnNames = persister.getContraintOrderedTableKeyColumnClosure();
String idSubselect = generateIdSubselect( persister );
List assignmentSpecifications = walker.getAssignmentSpecifications();
updates = new String[tableNames.length];
hqlParameters = new ParameterSpecification[tableNames.length][];
for ( int tableIndex = 0; tableIndex < tableNames.length; tableIndex++ ) {
boolean affected = false;
List parameterList = new ArrayList();
Update update = new Update( getFactory().getDialect() )
.setTableName( tableNames[tableIndex] )
.setWhere( "(" + StringHelper.join( ", ", columnNames[tableIndex] ) + ") IN (" + idSubselect + ")" );
if ( getFactory().getSettings().isCommentsEnabled() ) {
update.setComment( "bulk update" );
}
final Iterator itr = assignmentSpecifications.iterator();
while ( itr.hasNext() ) {
final AssignmentSpecification specification = ( AssignmentSpecification ) itr.next();
if ( specification.affectsTable( tableNames[tableIndex] ) ) {
affected = true;
update.appendAssignmentFragment( specification.getSqlAssignmentFragment() );
if ( specification.getParameters() != null ) {
for ( int paramIndex = 0; paramIndex < specification.getParameters().length; paramIndex++ ) {
parameterList.add( specification.getParameters()[paramIndex] );
}
}
}
}
if ( affected ) {
updates[tableIndex] = update.toStatementString();
hqlParameters[tableIndex] = ( ParameterSpecification[] ) parameterList.toArray( new ParameterSpecification[0] );
}
}
}
public Queryable getAffectedQueryable() {
return persister;
}
public String[] getSqlStatements() {
return updates;
}
public int execute(QueryParameters parameters, SessionImplementor session) throws HibernateException {
coordinateSharedCacheCleanup( session );
createTemporaryTableIfNecessary( persister, session );
try {
// First, save off the pertinent ids, as the return value
PreparedStatement ps = null;
int resultCount = 0;
try {
try {
ps = session.getBatcher().prepareStatement( idInsertSelect );
// int parameterStart = getWalker().getNumberOfParametersInSetClause();
// List allParams = getIdSelectParameterSpecifications();
// Iterator whereParams = allParams.subList( parameterStart, allParams.size() ).iterator();
Iterator whereParams = getIdSelectParameterSpecifications().iterator();
int sum = 1; // jdbc params are 1-based
while ( whereParams.hasNext() ) {
sum += ( ( ParameterSpecification ) whereParams.next() ).bind( ps, parameters, session, sum );
}
resultCount = ps.executeUpdate();
}
finally {
if ( ps != null ) {
session.getBatcher().closeStatement( ps );
}
}
}
catch( SQLException e ) {
throw JDBCExceptionHelper.convert(
getFactory().getSQLExceptionConverter(),
e,
"could not insert/select ids for bulk update",
idInsertSelect
);
}
// Start performing the updates
for ( int i = 0; i < updates.length; i++ ) {
if ( updates[i] == null ) {
continue;
}
try {
try {
ps = session.getBatcher().prepareStatement( updates[i] );
if ( hqlParameters[i] != null ) {
int position = 1; // jdbc params are 1-based
for ( int x = 0; x < hqlParameters[i].length; x++ ) {
position += hqlParameters[i][x].bind( ps, parameters, session, position );
}
}
ps.executeUpdate();
}
finally {
if ( ps != null ) {
session.getBatcher().closeStatement( ps );
}
}
}
catch( SQLException e ) {
throw JDBCExceptionHelper.convert(
getFactory().getSQLExceptionConverter(),
e,
"error performing bulk update",
updates[i]
);
}
}
return resultCount;
}
finally {
dropTemporaryTableIfNecessary( persister, session );
}
}
protected Queryable[] getAffectedQueryables() {
return new Queryable[] { persister };
}
}
