| public buildExistsCondition ( string $operator, array $operands, array &$params ) : string | ||
| $operator | string | the operator to use (e.g. `EXISTS` or `NOT EXISTS`) |
| $operands | array | contains only one element which is a [[Query]] object representing the sub-query. |
| $params | array | the binding parameters to be populated |
| Résultat | string | the generated SQL expression |
public function buildExistsCondition($operator, $operands, &$params)
{
if ($operands[0] instanceof Query) {
list($sql, $params) = $this->build($operands[0], $params);
return "{$operator} ({$sql})";
} else {
throw new InvalidParamException('Subquery for EXISTS operator must be a Query object.');
}
}