/**
* This function adds a "where" constraint.
*
* @access public
* @param string $column the column to be constrained
* @param string $operator the operator to be used
* @param string $value the value the column is constrained with
* @param string $connector the connector to be used
* @return DB_SQL_Update_Proxy a reference to the current instance
*/
public function where($column, $operator, $value, $connector = 'AND')
{
$this->builder->where($column, $operator, $value, $connector);
return $this;
}
