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PowerShell でCloudant Data データをCSV に落としてみた

標準PowerShell cmdlets を使ってCloudant テーブルにアクセス。

CData Cmdlets Module for Cloudant は、直感的なCloudant データ連携を提供する標準cmdlet です。 本記事では、Cloudant Cmdlets を使ったサンプルを提供します。

Creating a Connection to Your Cloudant Data

Set the following connection properties to connect to Cloudant:

  • User: Set this to your username.
  • Password: Set this to your password.

$conn = Connect-Cloudant  -User "$User" -Password "$Password"

Selecting Data

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

Select-Cloudant -Connection $conn -Table Movies | Select -Property * -ExcludeProperty Connection,Table,Columns | Export-Csv -Path c:\myMoviesData.csv -NoTypeInformation

You will notice that we piped the results from Select-Cloudant 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.

The Connection, Table, and Columns are appended to the results in order to facilitate piping results from one of the CData Cmdlets directly into another one.

Deleting Data

The following line deletes any records that match the criteria:

Select-Cloudant -Connection $conn -Table Movies -Where "MovieRating = R" | Remove-Cloudant

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 Cloudant, checking first whether a record already exists and needs to be updated instead of inserted.

Import-Csv -Path C:\MyMoviesUpdates.csv | %{
  $record = Select-Cloudant -Connection $Cloudant -Table Movies -Where ("Id = `'"+$_.Id+"`'")
  if($record){
    Update-Cloudant -Connection $cloudant -Table Movies -Columns ("MovieRuntime","MovieRating") -Values ($_.MovieRuntime, $_.MovieRating) -Where ("Id = `'"+$_.Id+"`'")
  }else{
    Add-Cloudant -Connection $cloudant -Table Movies -Columns ("MovieRuntime","MovieRating") -Values ($_.MovieRuntime, $_.MovieRating)
  }
}

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!

 
 
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