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PowerShell Scripting to Replicate HPCC Systems Data to MySQL

Write a simple PowerShell script to replicate HPCC Systems data to a MySQL database.

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

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

To connect, set the following connection properties: Set URL to the machine name or IP address of the server and the port the server is running on, for example, https://server:port. The User and Password are required to authenticate to the HPCC Systems cluster specified in the URL. Note that LDAP authentication is not currently supported by our ODBC driver.

Set Version to the WsSQL Web server version. Note that if you have not already done so, you will need to install the WsSQL service on the HPCC Systems server. The WsSQL Web service is used to interact with the underlying HPCC Systems platform.

Set Cluster to the target cluster.

Collecting HPCC Systems Data

  1. Install the module:

    Install-Module HPCCCmdlets
  2. Connect to HPCC Systems:

    $hpcc = Connect-HPCC -URL $URL -User $User -password $password -Version $Version -Cluster $Cluster
  3. Retrieve the data from a specific resource:

    $data = Select-HPCC -Connection $hpcc -Table "hpcc::test::orders"

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

    $data = Invoke-HPCC -Connection $hpcc -Query 'SELECT * FROM hpcc::test::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 HPCC Systems 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 HPCC Systems 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 HPCC Systems resource (hpcc::test::orders) and to exist in the database.

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

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

    Select-HPCC -Connection $hpcc -Table "hpcc::test::orders" | % { $row = $_ $values = @() $columns | % { $col = $_ $values += $row.$($col) } Add-MySQL -Connection $mysql -Table "hpcc::test::orders" -Columns $columns -Values $values }
  • If you wish to replicate the HPCC Systems 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-HPCC 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')}