/**
* Shortcut to implementing an EXISTS test for one or more values as a new expression
* @param Query $values
* @param string $paramname
* @param boolean $positive
* @return QueryWhere Returns $this, for fluid interface
*/
public function exists(Query $values, $paramname = null, $positive = true)
{
$expression = '';
if (!$positive) {
$expression .= 'NOT ';
}
$expression .= 'EXISTS (' . $values->get() . ')';
$this->parameters = array_merge($this->parameters, $values->params());
if (empty($paramname)) {
$paramname = count($this->expressions) + 1;
}
$this->expressions[$paramname] = $expression;
return $this;
}
