[sr-dev] [tracker] Task opened: SQLOPS returns 0 for empty result set instead of $null

[sip-router]

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User who did this - Dmitry Davletbaev (ddomgn) 

Attached to Project - sip-router
Summary - SQLOPS returns 0 for empty result set instead of $null
Task Type - Bug Report
Category - Module
Status - Unconfirmed
Assigned To - 
Operating System - Linux
Severity - Low
Priority - Normal
Reported Version - Development
Due in Version - Undecided
Due Date - Undecided
Details - **System**: Debian Wheezy

**Kamailio version**: 4.1.0

I use SQLOPS module to query additional data in MySQL database. Script logic is based on user related DB records existence. I check wether records exist or not simply by assigning variable:

        $var(touser) = $dbr(touser=>[0,0]);
        if ($var(touser) != $null) {
                [...]
        } else {
                [...]
        }

Above code works perfectly in Kamailio 4.0.3 and 4.0.4, but in 4.1.0 a zero is
assigned to $var(touser), so I had to change 'if' statement to

        if ($var(touser) != 0) {

I consider this behavior as a bug, because "no value" should be represented by $null, not 0. Correct me if I am wrong.

More information can be found at the following URL:
http://sip-router.org/tracker/index.php?do=details&task_id=376

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