SQL powershell to query and update the tables

I have this script and I want to update one of table or datafield but it didn't work.

#> 

function SQL-Update {

param (

      [string]$server=SQL2012,

      [string]$database=Test,

      [string]$table=Works,

      [string]$datafield=Id;Name,

      [string]$datavalue=charvar,

      [string]$updateID= 'DEV123'

)

$sqlquery = @"

Update $database.$table

SET $dataField='$dataValue'

WHERE id=$UpdateID

"@

try {

     invoke-SQLcmd -ServerInstance $Server -Database $database -

Query $sqlquery

     }

     catch {

     }