PowerShell Scripting to Replicate GraphQL Data to MySQL

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

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

You must specify the URL of the GraphQL service. The driver supports two types of authentication:

• Set AuthScheme to Basic. You must specify the User and Password of the GraphQL service.
• Take a look at the OAuth section in the Help documentation for detailed instructions.

Collecting GraphQL Data

1. Install the module:

   Install-Module GraphQLCmdlets

2. Connect to GraphQL:

    $graphql = Connect-GraphQL -AuthScheme $AuthScheme -User $User -Password $Password -URL $URL -InitiateOAuth $InitiateOAuth
    

3. Retrieve the data from a specific resource:

    $data = Select-GraphQL -Connection $graphql -Table "Users"
    

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

    $data = Invoke-GraphQL -Connection $graphql -Query 'SELECT * FROM Users WHERE UserLogin = @UserLogin' -Params @{'@UserLogin'='admin'}
    

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

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

Inserting GraphQL 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 GraphQL 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 GraphQL resource (Users) and to exist in the database.

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

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

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

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