PowerShell Scripting to Replicate Oracle Data to MySQL

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

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

To connect to Oracle, you'll first need to update your PATH variable and ensure it contains a folder location that includes the native DLLs. The native DLLs can be found in the lib folder inside the installation directory. Once you've done this, set the following to connect:

• Port: The port used to connect to the server hosting the Oracle database.
• User: The user Id provided for authentication with the Oracle database.
• Password: The password provided for authentication with the Oracle database.
• Service Name: The service name of the Oracle database.

Collecting Oracle Data

1. Install the module:

   Install-Module OracleOCICmdlets

2. Connect to Oracle:

   $oracleoci = Connect-OracleOCI -User $User -Password $Password -Server $Server -Port $Port

3. Retrieve the data from a specific resource:

   $data = Select-OracleOCI -Connection $oracleoci -Table "Customers"

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

   $data = Invoke-OracleOCI -Connection $oracleoci -Query 'SELECT * FROM Customers WHERE Country = @Country' -Params @{'@Country'='US'}

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

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

Inserting Oracle 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 Oracle 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 Oracle resource (Customers) and to exist in the database.

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

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

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

• If you wish to replicate the Oracle 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-OracleOCI 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')}