Automate PostgreSQL Integration Tasks from PowerShell

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PostgreSQL ADO.NET Provider

Rapidly create and deploy powerful .NET applications that integrate with PostgreSQL-compatible database engines.



Are you looking for a quick and easy way to access PostgreSQL data from PowerShell? We show how to use the Cmdlets for PostgreSQL and the CData ADO.NET Provider for PostgreSQL to connect to PostgreSQL data and synchronize, automate, download, and more.

The CData Cmdlets for PostgreSQL are standard PowerShell cmdlets that make it easy to accomplish data cleansing, normalization, backup, and other integration tasks by enabling real-time and bidirectional access to PostgreSQL.

Cmdlets or ADO.NET?

The cmdlets are not only a PowerShell interface to the PostgreSQL API, but also an SQL interface; this tutorial shows how to use both to create, retrieve, update, and delete PostgreSQL data. We also show examples of the ADO.NET equivalent, which is possible with the CData ADO.NET Provider for PostgreSQL. To access PostgreSQL data from other .NET applications, like LINQPad, use the CData ADO.NET Provider for PostgreSQL.

After obtaining the needed connection properties, accessing PostgreSQL data in PowerShell consists of three basic steps.

To connect to PostgreSQL, 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 data provider connects to the user's default database.

PowerShell

  1. Install the module:

    Install-Module PostgreSQLCmdlets
  2. Connect:

    $postgresql = Connect-PostgreSQL -User "$User" -Password "$Password" -Database "$Database" -Server "$Server" -Port "$Port"
  3. Search for and retrieve data:

    $shipcountry = "USA" $orders = Select-PostgreSQL -Connection $postgresql -Table "Orders" -Where "ShipCountry = `'$ShipCountry`'" $orders

    You can also use the Invoke-PostgreSQL cmdlet to execute SQL commands:

    $orders = Invoke-PostgreSQL -Connection $postgresql -Query 'SELECT * FROM Orders WHERE ShipCountry = @ShipCountry' -Params @{'@ShipCountry'='USA'}

ADO.NET

  1. Load the provider's assembly:

    [Reflection.Assembly]::LoadFile("C:\Program Files\CData\CData ADO.NET Provider for PostgreSQL\lib\System.Data.CData.PostgreSQL.dll")
  2. Connect to PostgreSQL:

    $conn= New-Object System.Data.CData.PostgreSQL.PostgreSQLConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432;") $conn.Open()
  3. Instantiate the PostgreSQLDataAdapter, execute an SQL query, and output the results:

    $sql="SELECT ShipName, ShipCity from Orders" $da= New-Object System.Data.CData.PostgreSQL.PostgreSQLDataAdapter($sql, $conn) $dt= New-Object System.Data.DataTable $da.Fill($dt) $dt.Rows | foreach { Write-Host $_.shipname $_.shipcity }

Update PostgreSQL Data

PowerShell

Update-PostgreSQL -Connection $PostgreSQL -Columns @('ShipName','ShipCity') -Values @('MyShipName', 'MyShipCity') -Table Orders -Id "MyId"

ADO.NET

$cmd = New-Object System.Data.CData.PostgreSQL.PostgreSQLCommand("UPDATE Orders SET ShipCountry='USA' WHERE Id = @myId", $conn) $cmd.Parameters.Add(new System.Data.CData.PostgreSQL.PostgreSQLParameter("@myId","10456255-0015501366")) $cmd.ExecuteNonQuery()

Insert PostgreSQL Data

PowerShell

Add-PostgreSQL -Connection $PostgreSQL -Table Orders -Columns @("ShipName", "ShipCity") -Values @("MyShipName", "MyShipCity")

ADO.NET

$cmd = New-Object System.Data.CData.PostgreSQL.PostgreSQLCommand("INSERT INTO Orders (ShipCountry) VALUES (@myShipCountry)", $conn) $cmd.Parameters.Add(new System.Data.CData.PostgreSQL.PostgreSQLParameter("@myShipCountry","USA")) $cmd.ExecuteNonQuery()

Delete PostgreSQL Data

PowerShell

Remove-PostgreSQL -Connection $PostgreSQL -Table "Orders" -Id "MyId"

ADO.NET

$cmd = New-Object System.Data.CData.PostgreSQL.PostgreSQLCommand("DELETE FROM Orders WHERE Id=@myId", $conn) $cmd.Parameters.Add(new System.Data.CData.PostgreSQL.PostgreSQLParameter("@myId","001d000000YBRseAAH")) $cmd.ExecuteNonQuery()