/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.sql;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

An SQL DELETE statement
Author:Gavin King
/** * An SQL <tt>DELETE</tt> statement * * @author Gavin King */
public class Delete { private String tableName; private String versionColumnName; private String where; private Map primaryKeyColumns = new LinkedHashMap(); private String comment; public Delete setComment(String comment) { this.comment = comment; return this; } public Delete setTableName(String tableName) { this.tableName = tableName; return this; } public String toStatementString() { StringBuilder buf = new StringBuilder( tableName.length() + 10 ); if ( comment!=null ) { buf.append( "/* " ).append(comment).append( " */ " ); } buf.append( "delete from " ).append(tableName); if ( where != null || !primaryKeyColumns.isEmpty() || versionColumnName != null ) { buf.append( " where " ); } boolean conditionsAppended = false; Iterator iter = primaryKeyColumns.entrySet().iterator(); while ( iter.hasNext() ) { Map.Entry e = (Map.Entry) iter.next(); buf.append( e.getKey() ).append( '=' ).append( e.getValue() ); if ( iter.hasNext() ) { buf.append( " and " ); } conditionsAppended = true; } if ( where!=null ) { if ( conditionsAppended ) { buf.append( " and " ); } buf.append( where ); conditionsAppended = true; } if ( versionColumnName!=null ) { if ( conditionsAppended ) { buf.append( " and " ); } buf.append( versionColumnName ).append( "=?" ); } return buf.toString(); } public Delete setWhere(String where) { this.where=where; return this; } public Delete addWhereFragment(String fragment) { if ( where == null ) { where = fragment; } else { where += ( " and " + fragment ); } return this; } public Delete setPrimaryKeyColumnNames(String[] columnNames) { this.primaryKeyColumns.clear(); addPrimaryKeyColumns(columnNames); return this; } public Delete addPrimaryKeyColumns(String[] columnNames) { for ( String columnName : columnNames ) { addPrimaryKeyColumn( columnName, "?" ); } return this; } public Delete addPrimaryKeyColumns(String[] columnNames, boolean[] includeColumns, String[] valueExpressions) { for ( int i=0; i<columnNames.length; i++ ) { if( includeColumns[i] ) { addPrimaryKeyColumn( columnNames[i], valueExpressions[i] ); } } return this; } public Delete addPrimaryKeyColumns(String[] columnNames, String[] valueExpressions) { for ( int i=0; i<columnNames.length; i++ ) { addPrimaryKeyColumn( columnNames[i], valueExpressions[i] ); } return this; } public Delete addPrimaryKeyColumn(String columnName, String valueExpression) { this.primaryKeyColumns.put(columnName, valueExpression); return this; } public Delete setVersionColumnName(String versionColumnName) { this.versionColumnName = versionColumnName; return this; } }