How to update datatable and commit back to sql server source - powershell

Question

Alright so I have a table with some data in it. Here is a screenshot of the table def in SQL server:
And there is an app which populates some of the data in the table. Here is a screenshot of the sample data. All columns except for [emailSentCount] are populated by an external app.
Now my question is with with a Powershell script that I'm trying to build to consume this data and send email Notifications. I read all the content of the table in a DataTable. I go through each Row and decide if I have to send an email for that row. If so, then I send the email and I update the [emailSentCount] column by adding + 1 to it.
At the end of the script I'm trying to send these changes I made to the DataTable back to the table on SQL server. However I get an error:
Here is the script I'm working with.
param(
[string]$SQLServerName="SQLServerName\InstanceName"
,[string]$SQLDatabaseName="DBName"
,[string]$SQLTableName = "UserList"
,[string]$SQLSelectQuery="SELECT * FROM $SQLTableName"
)
cls
Function SendEmail
{
Param(
[string]$ToMailAddress,
[int]$MessageTemplate
)
[string]$MessageBody=$null
switch ($MessageTemplate)
{
1 {$MessageBody = Test new certificate issued. Please ignore!}
2 {$MessageBody = Test existing certificate renewed. Please ignore!}
}
$from = "EmailApplicationAccount#example.com"
$to = $ToMailAddress
$smtp = "smtp.example.net"
Send-MailMessage
-From $from
-To $to
-Subject $MessageBody
-SmtpServer $smtp
}
$sqlConn = New-Object System.Data.SqlClient.SqlConnection
$sqlConn.ConnectionString = “Server=$SQLServerName;Integrated Security=true;Initial Catalog=$SQLDatabaseName”
$sqlConn.Open()
$sqlCommand = $sqlConn.CreateCommand()
$sqlCommand.CommandText = $SQLSelectQuery
$dataAdapter = New-Object System.Data.SqlClient.SqlDataAdapter $sqlCommand
$dataTable = New-Object System.Data.DataTable
$dataAdapter.Fill($dataTable) | Out-Null
foreach($dataRow in $dataTable.Rows)
{
write-host $dataRow["shouldSendEmail"]
if($dataRow["shouldSendEmail"] -eq $true)
{
# First send email depending on whether its a first time new cert or a cert renewal.
if($dataRow["certRenewal"] -eq $true)
{
SendEmail -ToMailAddress $dataRow["email"] -MessageTemplate 2
}
else
{
SendEmail -ToMailAddress $dataRow["email"] -MessageTemplate 1
}
# After you have sent the email, increase the emailSentCount value in the datatable.
$dataRow["emailSentCount"] = $dataRow["emailSentCount"] + 1
#Also reset the shouldSendEmail column to $false/0
$dataRow["shouldSendEmail"] = $false
}
}
$dataAdapter.Update($dataTable)
$sqlConn.Close()
It seems I need to include some Update command. But what will it look like in this context and wwhere does it need to be included?

Answer 1

Actually, I found the solution. We have to build an update command before we start messing with the data in the rows. Here is the bit I added just before the Foreach loop.
# command builder
$commandBuilder = new-object system.data.sqlclient.sqlcommandbuilder($dataAdapter)
$dataAdapter.UpdateCommand = $commandBuilder.GetUpdateCommand()
And that was it! No errors and I can see the data on columns [shouldSendEmail] and [emailSentCount] change on the source table in SQL server as intended in the script.