public function setOperator($operator)
  {
    $this->checkParams($this->operation,$operator);
    $this->operator=$operator;
  }
public function setOperator($operator)
  {
    $this->checkParams($this->operation,$operator);
    $this->operator=$operator;
  }
public function setOperator ( $ operator ) { $ this -> checkParams ( $ this -> operation , $ operator ) ; $ this -> operator = $ operator ; }
Set the operator that has to be used when this SQLOperation
is used in the WHERE part of a query.

@param string $operator  sql comparison operator (IN,BETWEEN)
Set the operator that has to be used when this SQLOperation is used in the WHERE part of a query .