PowerShell Scripting to Replicate DB2 Data to MySQL

The CData Cmdlets for DB2 offer live access to DB2 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 DB2 and the CData Cmdlets for MySQL in PowerShell to replicate DB2 data to a MySQL database.

After obtaining the needed connection properties, accessing DB2 data in PowerShell and preparing for replication consists of four basic steps.

Set the following properties to connect to DB2:

• Server: Set this to the name of the server running DB2.
• Port: Set this to the port the DB2 server is listening on.
• Database: Set this to the name of the DB2 database.
• User: Set this to the username of a user allowed to access the database.
• Password: Set this to the password of a user allowed to access the database.

You will also need to install the corresponding DB2 driver:

• Windows: Install the IBM Data Server Provider for .NET.

  On Windows, installing the IBM Data Server Provider is sufficient, as the installation registers it in the machine.config.

• Java: Install the IBM Data Server Driver for JDBC.

  In the Java version, place the IBM Data Server Driver JAR in the www\WEB-INF\lib\ folder for this application.

Collecting DB2 Data

1. Install the module:

   Install-Module DB2Cmdlets

2. Connect to DB2:

   $db2 = Connect-DB2 -Server $Server -Port $Port -User $User -Password $Password -Database $Database

3. Retrieve the data from a specific resource:

   $data = Select-DB2 -Connection $db2 -Table "Orders"

   You can also use the Invoke-DB2 cmdlet to execute pure SQL-92 statements:

   $data = Invoke-DB2 -Connection $db2 -Query 'SELECT * FROM Orders WHERE ShipCity = @ShipCity' -Params @{'@ShipCity'='New York'}

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

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

Inserting DB2 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 DB2 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 DB2 resource (Orders) and to exist in the database.

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

You have now replicated your DB2 data to a MySQL database. This gives you freedom to work with DB2 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 DB2 and MySQL in PowerShell, you can pipe command results to perform the replication in a single line:

  Select-DB2 -Connection $db2 -Table "Orders" | % { $row = $_ $values = @() $columns | % { $col = $_ $values += $row.$($col) } Add-MySQL -Connection $mysql -Table "Orders" -Columns $columns -Values $values }

• If you wish to replicate the DB2 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-DB2 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')}