Generate AD Logins from SQL Table

I need to create an import/export process that generates Active Directory user accounts and mail contacts from information that is currently stored in a SQL server table.  I would prefer to use Powershell or T-SQL, as those are the scripting languages I am most familiar with.  I would like to get feedback on what the best approach to do this would be.  I would like to run the job(s) on a nightly basis and include checks that ignored pre-existing accounts and such.
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Barry CunneyCommented:
Use powershell to connect to your database and get the SQL Server contact records into a powershell table object
Then iterate through each row in the table object and call the Add AD Member cmdlet substituting in the table fields - you will have to work out the index of the fields from SQL server - like maybe your first field(index 0) is the username etc.

$conn = New-Object Data.Sqlclient.Sqlconnection`
    ("Data Source=YOURDATABASE;Initial Catalog=Contact_Database;Integrated Security=SSPI;")
$adapter = New-Object Data.Sqlclient.Sqldataadapter("exec usp_GetUserDetails", $conn)
$set = new-object data.dataset
$table = new-object data.datatable
$table = $set.tables[0]

foreach ($Row in $table.Rows)
  Add-QADGroupMember -identity $Row[0] -Member $Row[1]....................... ;`

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