Monitor a folder using Powershell and check it against a SQL table and send an email out if file doesn't exists in the last 6 hours - sql-server

Question

I am using powershell to check a folder and when a file gets added to the folder, it queries a sql table and if there hasn't been a file added in the last 6 hours then it will send an email to several people letting them know that the file was copied/uploaded to that folder.
I can send the email when a file gets added, but when I added the code to check the SQL table, it stopped working. Can someone help me figure out the rest of this script?
[code]
# make sure you adjust this to point to the folder you want to monitor
$PathToMonitor = "U:\temp\test"
explorer $PathToMonitor
$FileSystemWatcher = New-Object System.IO.FileSystemWatcher
$FileSystemWatcher.Path = $PathToMonitor
$FileSystemWatcher.IncludeSubdirectories = $true
# make sure the watcher emits events
$FileSystemWatcher.EnableRaisingEvents = $true
# define the code that should execute when a file change is detected
$Action = {
$details = $event.SourceEventArgs
$Name = $details.Name
$FullPath = $details.FullPath
$OldFullPath = $details.OldFullPath
$OldName = $details.OldName
$ChangeType = $details.ChangeType
$Timestamp = $event.TimeGenerated
$JustPath = Path.GetDirectoryName($FullPath)
# SQL Work ---------------------------------------------------------------------
$Server = 'SQL01'
$Database = 'FTP_Upload'
$Connection = New-Object System.Data.SQLClient.SQLConnection
$Connection.ConnectionString = "server='$Server';database='$Database';trusted_connection=true;"
$Connection.Open()
$Command = New-Object System.Data.SQLClient.SQLCommand
$Command.Connection = $Connection
$text = "{0} was {1} at {2}" -f $FullPath, $ChangeType, $Timestamp
$sql = "IF Not Exists (Select 1 From Transmit Where DateDiff(IsNull(TimeGenerated, '01/01/2020 01:00:00 PM'), '$Timestamp') < 6 ) AND PathOnly = '$JustPath' )
BEGIN
Insert Transmit(FullPath, PathOnly, TimeGenerated)
Values('$FullPath', '$JustPath', '$Timestamp')
END "
Write-Host ""
Write-Host $text -ForegroundColor Green
Write-Host $sql
# you can also execute code based on change type here
switch ($ChangeType)
{
'Created' {
# Check SQL to see if there has been a file ftp'd in the last 6 hours ------
$Command.CommandText = $sql
$Command.ExecuteReader()
$Connection.Close()
# Send Email ---------------------------------
$EmailFrom = “email1#domain1.com”
$EmailTo = “email2#domain2.com, email3#domain3.com”
$Subject = “FTP Notification”
$Body = $text
$SMTPServer = “smtp.office365.com”
$SMTPClient = New-Object Net.Mail.SmtpClient($SmtpServer, 587)
$SMTPClient.EnableSsl = $true
$SMTPClient.Credentials = New-Object System.Net.NetworkCredential(“email1#domain1.com”, “password”);
$SMTPClient.Send($EmailFrom, $EmailTo, $Subject, $Body)
Start-Sleep -Seconds 5
$SMTPClient.Dispose()
# this executes only when a file was renamed
$text = "File {0} was Created" -f $FullPath
Write-Host $text -ForegroundColor Yellow
}
default { Write-Host $_ -ForegroundColor Red -BackgroundColor White }
}
}
# add event handlers
$handlers = . {
Register-ObjectEvent -InputObject $FileSystemWatcher -EventName Changed -Action $Action -SourceIdentifier FSChange
Register-ObjectEvent -InputObject $FileSystemWatcher -EventName Created -Action $Action -SourceIdentifier FSCreate
Register-ObjectEvent -InputObject $FileSystemWatcher -EventName Deleted -Action $Action -SourceIdentifier FSDelete
Register-ObjectEvent -InputObject $FileSystemWatcher -EventName Renamed -Action $Action -SourceIdentifier FSRename
}
Write-Host "Watching for changes to $PathToMonitor"
try
{
do
{
Wait-Event -Timeout 1
Write-Host "." -NoNewline
} while ($true)
}
finally
{
# this gets executed when user presses CTRL+C
# remove the event handlers
Unregister-Event -SourceIdentifier FSChange
Unregister-Event -SourceIdentifier FSCreate
Unregister-Event -SourceIdentifier FSDelete
Unregister-Event -SourceIdentifier FSRename
# remove background jobs
$handlers | Remove-Job
# remove filesystemwatcher
$FileSystemWatcher.EnableRaisingEvents = $false
$FileSystemWatcher.Dispose()
"Event Handler disabled."
}
[/code]