PowerShell Scripting to Replicate Google Data Catalog Data to MySQL

The CData Cmdlets for Google Data Catalog offer live access to Google Data Catalog 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 Google Data Catalog and the CData Cmdlets for MySQL in PowerShell to replicate Google Data Catalog data to a MySQL database.

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

Google Data Catalog uses the OAuth authentication standard. Authorize access to Google APIs on behalf on individual users or on behalf of users in a domain.

Before connecting, specify the following to identify the organization and project you would like to connect to:

• OrganizationId: The ID associated with the Google Cloud Platform organization resource you would like to connect to. Find this by navigating to the cloud console.

  Click the project selection drop-down, and select your organization from the list. Then, click More -> Settings. The organization ID is displayed on this page.

• ProjectId: The ID associated with the Google Cloud Platform project resource you would like to connect to.

  Find this by navigating to the cloud console dashboard and selecting your project from the Select from drop-down. The project ID will be present in the Project info card.

When you connect, the OAuth endpoint opens in your default browser. Log in and grant permissions to the application to completes the OAuth process. For more information, refer to the OAuth section in the Help documentation.

Collecting Google Data Catalog Data

1. Install the module:

   Install-Module GoogleDataCatalogCmdlets

2. Connect to Google Data Catalog:

   $googledatacatalog = Connect-GoogleDataCatalog -ProjectId $ProjectId

3. Retrieve the data from a specific resource:

   $data = Select-GoogleDataCatalog -Connection $googledatacatalog -Table "Schemas"

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

   $data = Invoke-GoogleDataCatalog -Connection $googledatacatalog -Query 'SELECT * FROM Schemas WHERE ProjectId = @ProjectId' -Params @{'@ProjectId'='bigquery-public-data'}

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

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

Inserting Google Data Catalog 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 Google Data Catalog 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 Google Data Catalog resource (Schemas) and to exist in the database.

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

You have now replicated your Google Data Catalog data to a MySQL database. This gives you freedom to work with Google Data Catalog 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 Google Data Catalog and MySQL in PowerShell, you can pipe command results to perform the replication in a single line:

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

• If you wish to replicate the Google Data Catalog 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-GoogleDataCatalog 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')}