Automate CouchDB Integration Tasks from PowerShell

The CData Cmdlets for CouchDB 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 CouchDB.

PowerShell Cmdlets or ADO.NET Provider?

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

Once you have acquired the necessary connection properties, accessing CouchDB data in PowerShell can be enabled in three steps.

Set the following to connect:

• Url: The Url of your instance. For example: http://localhost:5984
• User The Apache CouchDB user account used to authenticate.
• Password The Apache CouchDB password associated with the authenticating user.

PowerShell

1. Install the module:

   Install-Module ApacheCouchDBCmdlets

2. Connect:

   $apachecouchdb = Connect-ApacheCouchDB -Url "$Url" -User "$User" -Password "$Password"
   

3. Search for and retrieve data:

   $movierating = "R"
   $movies = Select-ApacheCouchDB -Connection $apachecouchdb -Table "Movies" -Where "MovieRating = `'$MovieRating`'"
   $movies
   

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

   $movies = Invoke-ApacheCouchDB -Connection $apachecouchdb -Query 'SELECT * FROM Movies WHERE MovieRating = @MovieRating' -Params @{'@MovieRating'='R'}
   

ADO.NET

1. Load the provider's assembly:

   [Reflection.Assembly]::LoadFile("C:\Program Files\CData\CData ADO.NET Provider for CouchDB\lib\System.Data.CData.ApacheCouchDB.dll")
    

2. Connect to CouchDB:

    
   $conn= New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBConnection("Url=http://localhost:5984;User=abc123;Password=abcdef;")
   $conn.Open()
   

3. Instantiate the ApacheCouchDBDataAdapter, execute an SQL query, and output the results:

   $sql="SELECT MovieRuntime, MovieRating from Movies"
   
   $da= New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBDataAdapter($sql, $conn)
   $dt= New-Object System.Data.DataTable
   $da.Fill($dt)
   
   $dt.Rows | foreach {
   	Write-Host $_.movieruntime $_.movierating
   }
    

Update CouchDB Data

PowerShell

Update-ApacheCouchDB -Connection $ApacheCouchDB -Columns @('MovieRuntime','MovieRating') -Values @('MyMovieRuntime', 'MyMovieRating') -Table Movies -Id "MyId"

ADO.NET

$cmd = New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBCommand("UPDATE Movies SET MovieRating='R' WHERE Id = @myId", $conn)
$cmd.Parameters.Add((New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBParameter("@myId","10456255-0015501366")))
$cmd.ExecuteNonQuery()

Insert CouchDB Data

PowerShell

Add-ApacheCouchDB -Connection $ApacheCouchDB -Table Movies -Columns @("MovieRuntime", "MovieRating") -Values @("MyMovieRuntime", "MyMovieRating") 

ADO.NET

$cmd = New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBCommand("INSERT INTO Movies (MovieRating) VALUES (@myMovieRating)", $conn)
$cmd.Parameters.Add((New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBParameter("@myMovieRating","R")))
$cmd.ExecuteNonQuery()

Delete CouchDB Data

PowerShell

Remove-ApacheCouchDB -Connection $ApacheCouchDB -Table "Movies" -Id "MyId"

ADO.NET

$cmd = New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBCommand("DELETE FROM Movies WHERE Id=@myId", $conn)
$cmd.Parameters.Add((New-Object System.Data.CData.ApacheCouchDB.ApacheCouchDBParameter("@myId","001d000000YBRseAAH")))
$cmd.ExecuteNonQuery()