delete.java

来自「用Java实现的23个常用设计模式源代码」· Java 代码 · 共 58 行

//$Id: Delete.java,v 1.2.2.1 2003/11/27 15:28:38 oneovthafew Exp $
package net.sf.hibernate.sql;

import net.sf.hibernate.util.StringHelper;

/**
 * An SQL <tt>DELETE</tt> statement
 * 
 * @author Gavin King
 */
public class Delete {
	
	private String tableName;
	private String[] primaryKeyColumnNames;
	private String versionColumnName;
	private String where;
	
	public Delete setTableName(String tableName) {
		this.tableName = tableName;
		return this;
	}
	
	public String toStatementString() {
		StringBuffer buf = new StringBuffer( tableName.length() + 10 );
		buf.append("delete from ")
			.append(tableName)
			.append(" where ")
			.append( StringHelper.join("=? and ", primaryKeyColumnNames) )
			.append("=?");
		if (where!=null) {
			buf.append(" and ")
				.append(where);
		}
		if (versionColumnName!=null) {
			buf.append(" and ")
				.append(versionColumnName)
				.append("=?");
		}
		return buf.toString(); 
	}
	
	public Delete setWhere(String where) {
		this.where=where;
		return this;
	}
	
	public Delete setPrimaryKeyColumnNames(String[] primaryKeyColumnNames) {
		this.primaryKeyColumnNames = primaryKeyColumnNames;
		return this;
	}

	public Delete setVersionColumnName(String versionColumnName) {
		this.versionColumnName = versionColumnName;
		return this;
	}

}