Quick script to re-associate logins with users that have the same name. If the user in the database is named the same as the login and has no login currently associated with it, it will set the database user to use the login with the same name. Apparently, you can’t do this directly via powershell by setting the users’ login to the login name, as it errors out with “Modifying the Login property of the User object is not allowed. You must drop and recreate the object with the desired property.” Hence the SQL call to sync up the user.
[void][reflection.assembly]::LoadWithPartialName("Microsoft.SqlServer.ConnectionInfo")
[void][reflection.assembly]::LoadWithPartialName("Microsoft.SqlServer.SmoEnum")
[void][reflection.assembly]::LoadWithPartialName("Microsoft.SqlServer.Smo")
$serverName = 'ServerName'
try{
$srvConn = New-Object "Microsoft.SqlServer.Management.Common.ServerConnection"
$srvConn.ServerInstance = $serverName
$srv = New-Object Microsoft.SqlServer.Management.Smo.Server $srvConn
$srv.Logins | where{$_.LoginType -eq [Microsoft.SqlServer.Management.Smo.LoginType]::SqlLogin} | %{
$login = $_
$srv.Databases | %{
if($_.Users.Contains($login.Name)){
$user = $_.Users[$login.Name];
if($user.Login -eq ''){
<# #can't do this apparently, smo will only let you drop & re-create...
$user.Login = $login.Name;
$user.Alter();
#>
$_.ExecuteNonQuery("sp_change_users_login 'auto_fix', '" + $user.Name + "'")
}
}
}
}
}
catch{
$_ | fl -Force
}
Sql Server Powershell 
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