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The core O/RM functionality as provided by Hibernate

There is a newer version: 7.0.0.Beta1

/*
 * 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;

import org.hibernate.dialect.Dialect;
import org.hibernate.type.LiteralType;

/**
 * An SQL UPDATE statement
 *
 * @author Gavin King
 */
public class Update {

	private String tableName;
	private String versionColumnName;
	private String where;
	private String assignments;
	private String comment;

	private Map primaryKeyColumns = new LinkedHashMap();
	private Map columns = new LinkedHashMap();
	private Map whereColumns = new LinkedHashMap();
	
	private Dialect dialect;
	
	public Update(Dialect dialect) {
		this.dialect = dialect;
	}

	public String getTableName() {
		return tableName;
	}

	public Update appendAssignmentFragment(String fragment) {
		if ( assignments == null ) {
			assignments = fragment;
		}
		else {
			assignments += ", " + fragment;
		}
		return this;
	}

	public Update setTableName(String tableName) {
		this.tableName = tableName;
		return this;
	}

	public Update setPrimaryKeyColumnNames(String[] columnNames) {
		this.primaryKeyColumns.clear();
		addPrimaryKeyColumns(columnNames);
		return this;
	}	
	
	public Update addPrimaryKeyColumns(String[] columnNames) {
		for ( int i=0; i