Get blob from SQL Server database

getblob.ps1

## Export of "larger" Sql Server Blob to file
$Server = "."; 
$Database = "DatabaseName";
$Dest = "C:\Export\"; 
$bufferSize = 8192;   
 
$Sql = "select TOP 1 'Image.png', COLUMN from TABLE";

$con = New-Object Data.SqlClient.SqlConnection;
$con.ConnectionString = "Data Source=$Server;" + 
"user id=user;Password=password;" +
"Initial Catalog=$Database";
$con.Open();

$cmd = New-Object Data.SqlClient.SqlCommand $Sql, $con;
$rd = $cmd.ExecuteReader();

$out = [array]::CreateInstance('Byte', $bufferSize)

# Looping through records
While ($rd.Read())
{
    Write-Output ("Exporting: {0}" -f $rd.GetString(0));

    $fs = New-Object System.IO.FileStream ($Dest + $rd.GetString(0)), Create, Write;
    $bw = New-Object System.IO.BinaryWriter $fs;
   
    $start = 0;
    # Read first byte stream
    $received = $rd.GetBytes(1, $start, $out, 0, $bufferSize - 1);
    While ($received -gt 0)
    {
       $bw.Write($out, 0, $received);
       $bw.Flush();
       $start += $received;

       $received = $rd.GetBytes(1, $start, $out, 0, $bufferSize - 1);
    }

    $bw.Close();
    $fs.Close();
}

$fs.Dispose();
$rd.Close();
$cmd.Dispose();
$con.Close();

Write-Output ("Finished");