How to add hash table values to SQL Table using Powershell

Hi,

I have sharepoint list with four(column1, column2, column3,column4)columns.I am reading the list column values and adding to hashtable. Now I want to add values from hastable to SQL table with four(column1, column2, colum3,column4)columns using powershell.

I have written the following script for single column but I would like to know how to add values for multiple columns.



            if(($key -eq "Column1") )
            {

               $SqlQuery = "INSERT INTO [TableName] ([Column1]) VALUES ('" + $HashTable.Item($key) +"')"
               #Set new object to connect to sql database
               $connection = new-object system.data.sqlclient.sqlconnection
               $Connection.ConnectionString ="server=SQLServerName;database=SQLDBName;Integrated Security = True;"
          $connection #List connection information 
               $connection.open() #Open Connection
             $Cmd = New-Object System.Data.SqlClient.SqlCommand
             $Cmd.CommandText = $SqlQuery
               $Cmd.Connection = $connection
              $SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
              $SqlAdapter.SelectCommand = $SqlCmd
              $DataSet = New-Object System.Data.DataSet
              $SqlAdapter.Fill($DataSet)
              $DataSet.Tables[0]
              $connection.Close()

Can anybody please help me out to accomplish the task? Any help would be greatly appreciated.

Thank you advance.

AA.