Invoke-Sqlcmd returning unwanted columns such as RowError, HasErrors

I’ve been performing some SQL queries recently using PowerShell and Invoke-SqlCmd.  Here is a simple example of returning a list of devices (a single column of data) from a database:

Invoke-Sqlcmd -ServerInstance "AlkaneSQLInstance" -Database "AlkaneSQLDatabase" -Query "SELECT Device FROM Devices"

Of course I pipe this into Export-CSV like so:

Invoke-Sqlcmd -ServerInstance "AlkaneSQLInstance" -Database "AlkaneSQLDatabase" -Query "SELECT Device FROM Devices" | Export-Csv -NoTypeInformation -Path "C:\Temp\Alkane.csv"

When we read the exported data in the CSV we expect one column of data called ‘Device’.  However, instead we can also see columns called RowError, HasErrors and others!  And whilst I’m not sure why these appear, we can omit them like so:

Invoke-Sqlcmd -ServerInstance "AlkaneSQLInstance" -Database "AlkaneSQLDatabase" -Query "SELECT Device FROM Devices" | Select * -ExcludeProperty RowError, RowState, Table, ItemArray, HasErrors

and of course if we wanted to pipe this into a CSV we can do so like this:

Invoke-Sqlcmd -ServerInstance "AlkaneSQLInstance" -Database "AlkaneSQLDatabase" -Query "SELECT Device FROM Devices" | Select * -ExcludeProperty RowError, RowState, Table, ItemArray, HasErrors | Export-Csv -NoTypeInformation -Path "C:\Temp\Alkane.csv"

And voila.  We only get the columns of data that we asked for!

Checking if System.Object[] contains a value

This isn’t the most interesting of blog posts admittedly.  But I was using the SQL Server Management Objects in my PowerShell script to return a result set from a stored procedure in SQL server.  The data set returned from the Invoke-sqlcmd command was a System.Object[] type.  I wanted to see if a column (the Department column) in the result set contained a specific value. So firstly I obtained the result set like so:

# Load the SQL Server SMO library
[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.Smo") 
Import-Module "sqlps" -DisableNameChecking

#SQL Server
$SQLServer = "ALKANESQLSERVER"
#Database
$SQLDatabase = "ALKANESQLDATABASE"
#Return results from stored procedure
$sql_departments = Invoke-Sqlcmd -ServerInstance $SQLServer -Database $SQLDatabase -Query 'exec [dbo].[ALKANESTOREDPROCEDURE]'

In PowerShell 3 it was a trivial exercise:

if ($sql_departments."Department" -contains "AlkaneDepartment")
{

}

however in PowerShell 2 it required slightly more legwork, and was a little slower to run:

if (($sql_departments | Select -ExpandProperty Department) -contains "AlkaneDepartment")
{

}