getIsNullFunction

string public
\Bitrix\Main\DB\SqlHelper::getIsNullFunction(
 string $expression,
 string $result
);

This non-static method returns SQL function for testing database field or expressions against NULL value. When it is NULL then $result will be returned.

All parameters are SQL unsafe.

Parameters

Parameter	Description	Version
$expression	Database field or expression for testing against NULL.
$result	Database field or expression to be returned if `$expression` is NULL.

getIsNullFunction

Parameters

Examples