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Write a simple PowerShell script to replicate OData services to a MySQL database.
The CData Cmdlets for OData offer live access to OData services 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 OData and the CData Cmdlets for MySQL in PowerShell to replicate OData services to a MySQL database.
About OData Data Integration
CData simplifies access and integration of live OData services data. Our customers leverage CData connectivity to:
- Access OData versions 2.0, 3.0, and 4.0, working with legacy services and the latest features and capabilities.
- Leverage advanced query options, including $filter, $select, and $expand, enhancing data retrieval from 3rd party tools.
- Use Server-side execution of aggregation and grouping to minimize data transfer and boost performance.
- Authenticate securely using a variety of schemes, including Azure AD, digest, negotiate, NTLM, OAuth, and more means secure authentication with every connection.
- Use SQL stored procedures to manage OData service entities - listing, creating, and removing associations between entities.
Customers use CData's solutions to regularly integrate their OData services with preferred tools, such as Power BI, MicroStrategy, or Tableau, and to replicate data from OData services to their databases or data warehouses.
Getting Started
After obtaining the needed connection properties, accessing OData services in PowerShell and preparing for replication consists of four basic steps.
The User and Password properties, under the Authentication section, must be set to valid OData user credentials. In addition, you will need to specify a URL to a valid OData server organization root or OData services file.
Collecting OData Services
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Install the module:
Install-Module ODataCmdlets
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Connect to OData:
$odata = Connect-OData -URL $URL -UseIdUrl $UseIdUrl -OData Version $OData Version -Data Format $Data Format
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Retrieve the data from a specific resource:
$data = Select-OData -Connection $odata -Table "Orders"
You can also use the Invoke-OData cmdlet to execute pure SQL-92 statements:
$data = Invoke-OData -Connection $odata -Query 'SELECT * FROM Orders WHERE ShipCity = @ShipCity' -Params @{'@ShipCity'='New York'}
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Save a list of the column names from the returned data.
$columns = ($data | Get-Member -MemberType NoteProperty | Select-Object -Property Name).Name
Inserting OData Services into the MySQL Database
With the data and column names collected, you are ready to replicate the data into a MySQL database.
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Install the module:
Install-Module MySQLCmdlets
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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
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Loop through the OData services, 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 OData 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 OData services to a MySQL database. This gives you freedom to work with OData services in the same way that you work with other MySQL tables, whether that is performing analytics, building reports, or other business functions.
Notes
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Once you have connected to OData and MySQL in PowerShell, you can pipe command results to perform the replication in a single line:
Select-OData -Connection $odata -Table "Orders" | % { $row = $_ $values = @() $columns | % { $col = $_ $values += $row.$($col) } Add-MySQL -Connection $mysql -Table "Orders" -Columns $columns -Values $values }
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If you wish to replicate the OData services 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-OData 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')}