Take value from SQL server and delete relevant folders - powershell

Question

Im new to powershell and would like to
-delete all rows in a sql server DB that have a date older than 10 years
-for every row that is deleted also delete a folder or a hard disk
So for example if I run the query
DELETE FROM [RMS].[dbo].[requests] where date_logged < DATEADD(year, -10, GetDate())
I then thought I could get the lowest request_id and just delete any folders under that number.
So for example if I delete 10 rows with my delete query and then do a select
It would say that the lowest request_id is 11.
I've started below but I'm not sure how to capture that the oldest request_id is?
The SQL would be this ...
SELECT TOP 1 request_id FROM [RMS].[dbo].[requests] order by request_id asc
And also how I would delete any folder "less" than that value.
So if request_id = 11 then I'd need to delete
C:\temp\1
C:\temp\2
C:\temp\3
...
C:\temp\10
Thanks
P
$connectionString = "Data Source=server;Initial Catalog=RMS;Integrated Security=SSPI";
$connection = New-Object System.Data.SqlClient.SqlConnection($connectionString);
$commandR = New-Object System.Data.SqlClient.SqlCommand("DELETE FROM dbo.requests WHERE request_id= 1", $connection);
$commandCount = New-Object System.Data.SqlClient.SqlCommand("select count(*) from requests", $connection);
$connection.Open();
$rowsDeletedR = $commandR.ExecuteNonQuery();
Write-Host "$rowsDeletedR rows deleted";
$rowsCountR = $commandCount.ExecuteScalar();
Write-Host "$rowsCountR rows in requests table";
$connection.Close();

Answer 1

Your task is broad. I intentionally splitted it into smaller pieces. Take a look at this demo and comments.
Since Invoke-SqlCmd is considered harmful (SQL Injection), I use my own function to invoke SQL
function Invoke-Sql(
$ConnectionString,
$Query,
$Parameters
) {
$conn = New-Object System.Data.SqlClient.SqlConnection -ArgumentList $ConnectionString
$cmd = New-Object System.Data.SqlClient.SqlCommand -ArgumentList $Query,$conn
$conn.Open()
if ($Parameters) {
foreach ($arg in $Parameters.GetEnumerator()){
$cmd.Parameters.AddWithValue($arg.Key, $arg.Value) | Out-Null;
}
}
$reader = $cmd.ExecuteReader()
if ($reader.Read()) {
[string[]]$columns = 0..($reader.FieldCount-1) |
% { if ($reader.GetName($_)) { $reader.GetName($_) } else { "(no name $_)" } }
do {
$obj = #{}
0..($reader.FieldCount-1) | % { $obj[$columns[$_]] = $reader[$_] }
[PSCustomObject]$obj
} while ($reader.Read())
}
$reader.Dispose()
$cmd.Dispose()
$conn.Dispose()
}
You need a database table. Since there is no strict schema in question, I assume following, minimal:
$conn = 'Data Source=.;Initial Catalog=Test;Integrated Security=SSPI'
$createTestTable = #'
CREATE TABLE MyRequests
(
RequestId int,
DateLogged datetime
)
'#
Invoke-Sql $conn $createTestTable
There is no sample data, I assume folders named 1, 2, 3, .. 7 and matching records in SQL database:
1..7 | % {
Invoke-Sql $conn 'INSERT MyRequests VALUES (#id,#value)' #{id=$_;value=[DateTime]::Now.AddDays(-$_)}
mkdir $_
}
Table should contain following records (dates may differ):
RequestId DateLogged
----------- -----------------------
1 2018-09-23 14:47:49.113
2 2018-09-22 14:47:49.130
3 2018-09-21 14:47:49.137
4 2018-09-20 14:47:49.140
5 2018-09-19 14:47:49.140
6 2018-09-18 14:47:49.143
7 2018-09-17 14:47:49.147
Then, final solution:
#get deleted id's using OUTPUT clause
$older = Invoke-Sql $conn 'DELETE FROM MyRequests OUTPUT deleted.RequestId WHERE DateLogged<#date' #{date=[DATETime]::Now.AddDays(-4)}
#foreach id in returned set, delete corresponding folder
$older | select -ExpandProperty RequestId | % { rm $_ }