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Hibernate example source code file (Delete.java)

This example Hibernate source code file (Delete.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

delete, delete, iterator, linkedhashmap, map, map, string, string, stringbuffer, stringbuffer, util

The Hibernate Delete.java source code

/*
 * 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.sql;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * An SQL <tt>DELETE 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() {
		StringBuffer buf = new StringBuffer( 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 ( int i=0; i<columnNames.length; i++ ) {
			addPrimaryKeyColumn( columnNames[i], "?" );
		}
		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;
	}

}

Other Hibernate examples (source code examples)

Here is a short list of links related to this Hibernate Delete.java source code file:

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