PowerShell variables not being expanded in string? - powershell

Question

I have written some PowerShell
param (
[Parameter(Mandatory=$true)][string]$company,
[Parameter(Mandatory=$true)][string]$output
)
...
$objRecordset.Open("Select Col1, Col2, Col3 From $company_Table1.DBF", $objConnection,$adOpenStatic,$adLockOptimistic)
I am running it using
.\Test.ps1 -company A -output C:\test.txt
but for some reason the $company variable isn't being expanded even though it's in "quotes"?
Exception calling "Open" with "4" argument(s): "File '.dbf' does not exist."
At line:17 char:1
+ $objRecordset.Open("Select Col1, Col2, Col3 From $company_Table1. ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : ComMethodTargetInvocation
When I hardcode it as A_Table1.dbf it works fine ...

Answer 1

The error message it telling you that PowerShell is parsing $company_Table1 as the name of the variable; _ is not acting as a delimiter.
You need to tell PowerShell where the variable name being and ends using curl braces {}
${company}_Table1.DBF

Answer 2

.DBF stands for database file.
You are trying to do a select on the database and not on a table in that database.
So it makes sense this isn't working.
it should be Select * from TBL_Whatever LIMIT 0,1 ....
So you first need to open a connection to the DB file itself and then do your select against a TABLE in that DB.