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Test a null value in SQL Row

Posted on 2014-04-02
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Last Modified: 2014-04-07
Hello,

I'd like to test in a sql query if a row is null (value validated in my sql browser)

I've tested

if (! $row[0]) -> always false
if ($row[0] -eq $null) -> always false

Thx for help.
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Question by:Sybux
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LVL 19

Expert Comment

by:Raheman M. Abdul
ID: 39972545
try this:

if(    $row[0].count -eq 0      )


or

$row -eq $null

or

$result.hasrows -eq $false
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39972555
If !$row[0] is always false, this means $row[0] is never null.

Test to see what is stored in $row[0].
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Accepted Solution

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Sybux earned 0 total points
ID: 39972655
Finally after googled again and more, I've found the solution in this article :

http://blogs.technet.com/b/industry_insiders/archive/2008/09/15/testing-for-database-null-values-from-powershell.aspx

Basicaly, you need to test with the [System.DBNull] object like this :

if ([System.DBNull]::Value.Equals($rows[0])) { value is null } else { value is filled }
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39972723
You're right.

For completion sake:
- null means the absence of a reference to an object
- DBNull means a nonexistent database column
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Author Closing Comment

by:Sybux
ID: 39982593
Google is finally still best friend but after hours of search :)
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