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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2012, Red Hat Inc. 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 Inc.
*
* 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.spi;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.engine.spi.QueryParameters;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.hql.internal.ast.HqlSqlWalker;
import org.hibernate.hql.internal.ast.tree.DeleteStatement;
import org.hibernate.hql.internal.ast.tree.FromElement;
import org.hibernate.internal.util.StringHelper;
import org.hibernate.param.ParameterSpecification;
import org.hibernate.persister.collection.AbstractCollectionPersister;
import org.hibernate.persister.entity.Queryable;
import org.hibernate.sql.Delete;
import org.hibernate.type.CollectionType;
import org.hibernate.type.Type;
import org.jboss.logging.Logger;
/**
* @author Steve Ebersole
*/
public class TableBasedDeleteHandlerImpl
extends AbstractTableBasedBulkIdHandler
implements MultiTableBulkIdStrategy.DeleteHandler {
private static final Logger log = Logger.getLogger( TableBasedDeleteHandlerImpl.class );
private final Queryable targetedPersister;
private final String idInsertSelect;
private final List idSelectParameterSpecifications;
private final List deletes;
public TableBasedDeleteHandlerImpl(SessionFactoryImplementor factory, HqlSqlWalker walker) {
this( factory, walker, null, null );
}
public TableBasedDeleteHandlerImpl(
SessionFactoryImplementor factory,
HqlSqlWalker walker,
String catalog,
String schema) {
super( factory, walker, catalog, schema );
DeleteStatement deleteStatement = ( DeleteStatement ) walker.getAST();
FromElement fromElement = deleteStatement.getFromClause().getFromElement();
this.targetedPersister = fromElement.getQueryable();
final String bulkTargetAlias = fromElement.getTableAlias();
final ProcessedWhereClause processedWhereClause = processWhereClause( deleteStatement.getWhereClause() );
this.idSelectParameterSpecifications = processedWhereClause.getIdSelectParameterSpecifications();
this.idInsertSelect = generateIdInsertSelect( targetedPersister, bulkTargetAlias, processedWhereClause );
log.tracev( "Generated ID-INSERT-SELECT SQL (multi-table delete) : {0}", idInsertSelect );
final String idSubselect = generateIdSubselect( targetedPersister );
deletes = new ArrayList();
// find plural attributes defined for the entity being deleted...
//
// NOTE : this partially overlaps with DeleteExecutor, but it instead
// uses the temp table in the idSubselect.
for ( Type type : targetedPersister.getPropertyTypes() ) {
if ( ! type.isCollectionType() ) {
continue;
}
final CollectionType cType = (CollectionType) type;
final AbstractCollectionPersister cPersister = (AbstractCollectionPersister)factory.getCollectionPersister( cType.getRole() );
// if the plural attribute maps to a "collection table" we need
// to remove the rows from that table corresponding to any
// owners we are about to delete. "collection table" is
// (unfortunately) indicated in a number of ways, but here we
// are mainly concerned with:
// 1) many-to-many mappings
// 2) basic collection mappings
final boolean hasCollectionTable = cPersister.isManyToMany()
|| !cPersister.getElementType().isAssociationType();
if ( !hasCollectionTable ) {
continue;
}
deletes.add(
generateDelete(
cPersister.getTableName(),
cPersister.getKeyColumnNames(),
idSubselect,
"bulk delete - collection table clean up (" + cPersister.getRole() + ")"
)
);
}
String[] tableNames = targetedPersister.getConstraintOrderedTableNameClosure();
String[][] columnNames = targetedPersister.getContraintOrderedTableKeyColumnClosure();
for ( int i = 0; i < tableNames.length; i++ ) {
// TODO : an optimization here would be to consider cascade deletes and not gen those delete statements;
// the difficulty is the ordering of the tables here vs the cascade attributes on the persisters ->
// the table info gotten here should really be self-contained (i.e., a class representation
// defining all the needed attributes), then we could then get an array of those
deletes.add( generateDelete( tableNames[i], columnNames[i], idSubselect, "bulk delete" ) );
}
}
private String generateDelete(String tableName, String[] columnNames, String idSubselect, String comment) {
final Delete delete = new Delete()
.setTableName( tableName )
.setWhere( "(" + StringHelper.join( ", ", columnNames ) + ") IN (" + idSubselect + ")" );
if ( factory().getSettings().isCommentsEnabled() ) {
delete.setComment( comment );
}
return delete.toStatementString();
}
@Override
public Queryable getTargetedQueryable() {
return targetedPersister;
}
@Override
public String[] getSqlStatements() {
return deletes.toArray( new String[deletes.size()] );
}
@Override
public int execute(SessionImplementor session, QueryParameters queryParameters) {
prepareForUse( targetedPersister, session );
try {
PreparedStatement ps = null;
int resultCount = 0;
try {
try {
ps = session.getTransactionCoordinator().getJdbcCoordinator().getStatementPreparer().prepareStatement( idInsertSelect, false );
int pos = 1;
pos += handlePrependedParametersOnIdSelection( ps, session, pos );
for ( ParameterSpecification parameterSpecification : idSelectParameterSpecifications ) {
pos += parameterSpecification.bind( ps, queryParameters, session, pos );
}
resultCount = session.getTransactionCoordinator().getJdbcCoordinator().getResultSetReturn().executeUpdate( ps );
}
finally {
if ( ps != null ) {
session.getTransactionCoordinator().getJdbcCoordinator().release( ps );
}
}
}
catch( SQLException e ) {
throw convert( e, "could not insert/select ids for bulk delete", idInsertSelect );
}
// Start performing the deletes
for ( String delete : deletes ) {
try {
try {
ps = session.getTransactionCoordinator()
.getJdbcCoordinator()
.getStatementPreparer()
.prepareStatement( delete, false );
handleAddedParametersOnDelete( ps, session );
session.getTransactionCoordinator().getJdbcCoordinator().getResultSetReturn().executeUpdate( ps );
}
finally {
if ( ps != null ) {
session.getTransactionCoordinator().getJdbcCoordinator().release( ps );
}
}
}
catch (SQLException e) {
throw convert( e, "error performing bulk delete", delete );
}
}
return resultCount;
}
finally {
releaseFromUse( targetedPersister, session );
}
}
protected int handlePrependedParametersOnIdSelection(PreparedStatement ps, SessionImplementor session, int pos) throws SQLException {
return 0;
}
protected void handleAddedParametersOnDelete(PreparedStatement ps, SessionImplementor session) throws SQLException {
}
}
