Powershell - Output SQL Messages to file - sql-server

Question

I have a Powershell script that invokes a saved SQL Query file and runs it on a specific Server & Database. That part is working well, the issue is that I would like to save the SQL Messages that it generates to a log file (see picture).
SQL Output from after Query is run
This is not working with my current code, and I believe that's because since it's technically not Query output but instead reindexing and updating tables, not fetching data.
My current relevant code is:
{
Import-Module SQLPS
$Data = Invoke-Sqlcmd -InputFile $SQLQuery -ServerInstance $Server -Database $Database -QueryTimeout 0
$Data | out-file "$Output$Database$date.txt"
}
But that just generates an empty text file. I'm looking to get the info on rebuilding indexes and the updates it's doing saved off into a different file through Powershell. You can do this through SSMS by right clicking in the Messages window and clicking "Save Results As..." but looking to include this in my automation since it's running as a Scheduled Task and no one is on SSMS.
Powershell v3/Windows Server 2012/SQL SSMS 2014
Any help would be appreciated!! This is my first post so sorry for odd formatting.

Answer 1

It looks like the following link explains exactly this problem:
https://sqlnotesfromtheunderground.wordpress.com/2015/09/09/powershell-outputting-a-sql-server-query-result-from-the-message-tab/
Essentially, what you are seeing in the 'Messages' tab are not results from the query, but rather just PRINT statements (essentially the same as Write-Host or Console.WriteLine). If you use Invoke-SqlCommand2, its -Verbose option will capture these PRINT statements to the Verbose PowerShell stream. To then write this stream to a text file, you have to specify the specific stream (in this case, 4):
Invoke-Sqlcmd2 -ServerInstance . -Database master -Query "PRINT 'Export This result'" -Verbose 4> Out-File C:\Temp\Test.txt

Answer 2

I had the same issue but instead in powershell script i use it in a command and i used -verbose.
like this
Invoke-Sqlcmd -ServerInstance '.\Your_server_instance' -Database 'DATABASE_Name' -InputFile "D:\Your_script.sql" verbose 4> "C:\sql\YOUR_OUTPUT_FILE.txt"
so i think this code should work for you
{
Import-Module SQLPS
$Data = Invoke-Sqlcmd -InputFile $SQLQuery -ServerInstance $Server -Database $Database -QueryTimeout 0
$Data -verbose *> "$Output$Database$date.txt"
}
for -verbose *> it streams All output you can redirect specific streams :
1 Success output
2 Errors
3 Warning messages
4 Verbose output
5 Debug messages