How to pipe Greenplum Data to CSV in PowerShell

The CData Cmdlets Module for Greenplum is a standard PowerShell module offering straightforward integration with Greenplum. Below, you will find examples of using our Greenplum Cmdlets with native PowerShell cmdlets.

Creating a Connection to Your Greenplum Data

To connect to Greenplum, set the Server, Port (the default port is 5432), and Database connection properties and set the User and Password you wish to use to authenticate to the server. If the Database property is not specified, the default database for the authenticate user is used.

$conn = Connect-Greenplum  -User "$User" -Password "$Password" -Database "$Database" -Server "$Server" -Port "$Port"

Selecting Data

Follow the steps below to retrieve data from the Orders table and pipe the result into to a CSV file:

Select-Greenplum -Connection $conn -Table Orders | Select -Property * -ExcludeProperty Connection,Table,Columns | Export-Csv -Path c:\myOrdersData.csv -NoTypeInformation

You will notice that we piped the results from Select-Greenplum into a Select-Object cmdlet and excluded some properties before piping them into an Export-Csv cmdlet. We do this because the CData Cmdlets append Connection, Table, and Columns information onto each "row" in the result set, and we do not necessarily want that information in our CSV file.

Deleting Data

The following line deletes any records that match the criteria:

Select-Greenplum -Connection $conn -Table Orders -Where "ShipCountry = USA" | Remove-Greenplum

Inserting and Updating Data

The cmdlets make data transformation easy as well as data cleansing. The following example loads data from a CSV file into Greenplum, checking first whether a record already exists and needs to be updated instead of inserted.

Import-Csv -Path C:\MyOrdersUpdates.csv | %{
  $record = Select-Greenplum -Connection $Greenplum -Table Orders -Where ("Id = `'"+$_.Id+"`'")
  if($record){
    Update-Greenplum -Connection $greenplum -Table Orders -Columns ("Freight","ShipName") -Values ($_.Freight, $_.ShipName) -Where ("Id = `'"+$_.Id+"`'")
  }else{
    Add-Greenplum -Connection $greenplum -Table Orders -Columns ("Freight","ShipName") -Values ($_.Freight, $_.ShipName)
  }
}

As always, our goal is to simplify the way you connect to data. With cmdlets users can install a data module, set the connection properties, and start building. Download Cmdlets and start working with your data in PowerShell today!