getIsNullFunction

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

for testing database field or expressions against NULL value.

This non-static method returns SQL functionto test database fields and 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 NULL test.
$result	Database field or expression to return when $expression is NULL.

Examples