/** Set the query field to a SQL string that saves the specified object field values in the database. 
	* @param anObject Object whose field values need to be saved
	* @tableName String
	* @param columnMap Array 
	*/
	function setQueryToDeleteFrom_where_equals($tableName, $columnName, $value) {
		// MySQL implementation
		$this->query = 'DELETE FROM '. $tableName;
		$this->where_equals($columnName, $value);
	}