src/Web2All/Table/MultiValueOperator.class.php
public function toSQLString() {
    if ($this->operator=='IN') {
    	$sql = '(';
	    $komma = '';
	    for ($i=0;$i<count($this->operation);$i++)
	    {
	      $sql.= $komma.'?';
	      $komma = ',';
	    }
	    $sql.= ')';
	    return $sql;
    } elseif ($this->operator=='BETWEEN') {
    	return '? AND ?';
    }
  }
public function toSQLString() {
    if ($this->operator=='IN') {
    	$sql = '(';
	    $komma = '';
	    for ($i=0;$i<count($this->operation);$i++)
	    {
	      $sql.= $komma.'?';
	      $komma = ',';
	    }
	    $sql.= ')';
	    return $sql;
    } elseif ($this->operator=='BETWEEN') {
    	return '? AND ?';
    }
  }
This method is called by Web2All_Table_SaveObject when
inserting or updating an object with a Web2All_Table_SQLOperation
as value.

@return string