PowerShell Scripting to Replicate Teradata Data to MySQL

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

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

To connect to Teradata, provide authentication information and specify the database server name.

• User: Set this to the username of a Teradata user.
• Password: Set this to the password of the Teradata user.
• DataSource: Specify the Teradata server name, DBC Name, or TDPID.
• Port: Specify the port the server is running on.
• Database: Specify the database name. If not specified, the default database is used.

Collecting Teradata Data

1. Install the module:

   Install-Module TeradataCmdlets

2. Connect to Teradata:

   $teradata = Connect-Teradata -User $User -Password $Password -Server $Server -Database $Database

3. Retrieve the data from a specific resource:

   $data = Select-Teradata -Connection $teradata -Table "NorthwindProducts"

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

   $data = Invoke-Teradata -Connection $teradata -Query 'SELECT * FROM NorthwindProducts WHERE CategoryId = @CategoryId' -Params @{'@CategoryId'='5'}

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

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

Inserting Teradata 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 Teradata 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 Teradata resource (NorthwindProducts) and to exist in the database.

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

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

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

• If you wish to replicate the Teradata 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-Teradata 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')}