PowerShell Scripting to Replicate Greenhouse Data to MySQL

The CData Cmdlets for Greenhouse offer live access to Greenhouse data from within PowerShell. Using PowerShell scripts, you can easily automate regular tasks like data replication. This article will walk through using the CData Cmdlets for Greenhouse and the CData Cmdlets for MySQL in PowerShell to replicate Greenhouse data to a MySQL database.

After obtaining the needed connection properties, accessing Greenhouse data in PowerShell and preparing for replication consists of four basic steps.

You need an API key to connect to Greenhouse. To create an API key, follow the steps below:

1. Click the Configure icon in the navigation bar and locate Dev Center on the left.
2. Select API Credential Management.
3. Click Create New API Key.
• Set "API Type" to Harvest.
• Set "Partner" to custom.
• Optionally, provide a description.
4. Proceed to Manage permissions and select the appropriate permissions based on the resources you want to access through the driver.
5. Copy the created key and set APIKey to that value.

Collecting Greenhouse Data

1. Install the module:

   Install-Module GreenhouseCmdlets

2. Connect to Greenhouse:

   $greenhouse = Connect-Greenhouse -APIKey $APIKey

3. Retrieve the data from a specific resource:

   $data = Select-Greenhouse -Connection $greenhouse -Table "Applications"

   You can also use the Invoke-Greenhouse cmdlet to execute pure SQL-92 statements:

   $data = Invoke-Greenhouse -Connection $greenhouse -Query 'SELECT * FROM Applications WHERE Status = @Status' -Params @{'@Status'='Active'}

4. Save a list of the column names from the returned data.

   $columns = ($data | Get-Member -MemberType NoteProperty | Select-Object -Property Name).Name

Inserting Greenhouse Data into the MySQL Database

With the data and column names collected, you are ready to replicate the data into a MySQL database.

1. Install the module:

   Install-Module MySQLCmdlets

2. Connect to MySQL, using the server address and port of the MySQL server, valid user credentials, and a specific database with the table in which the data will be replicated:

   $mysql = Connect-MySQL -User $User -Password $Password -Database $Database -Server $Server -Port $Port

3. Loop through the Greenhouse data, store the values, and use the Add-MySQL cmdlet to insert the data into the MySQL database, one row at a time. In this example, the table will need to have the same name as the Greenhouse resource (Applications) and to exist in the database.

   $data | % { $row = $_ $values = @() $columns | % { $col = $_ $values += $row.$($col) } Add-MySQL -Connection $mysql -Table "Applications" -Columns $columns -Values $values }

You have now replicated your Greenhouse data to a MySQL database. This gives you freedom to work with Greenhouse data in the same way that you work with other MySQL tables, whether that is performing analytics, building reports, or other business functions.

Notes

• Once you have connected to Greenhouse and MySQL in PowerShell, you can pipe command results to perform the replication in a single line:

  Select-Greenhouse -Connection $greenhouse -Table "Applications" | % { $row = $_ $values = @() $columns | % { $col = $_ $values += $row.$($col) } Add-MySQL -Connection $mysql -Table "Applications" -Columns $columns -Values $values }

• If you wish to replicate the Greenhouse data to another database using another PowerShell module, you will want to exclude the Columns, Connection, and Table columns from the data returned by the Select-Greenhouse cmdlet since those columns are used to help pipe data from one CData cmdlet to another:

  $columns = ($data | Get-Member -MemberType NoteProperty | Select-Object -Property Name).Name | ? {$_ -NotIn @('Columns','Connection','Table')}