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PostgreSQL Data をMySQL にレプリケーションするPowerShell スクリプト

PowerShell でシンプルなスクリプトを記述し、PostgreSQL data をMySQL データベースにレプリケーション(複製)。

CData Cmdlets for PostgreSQL をつかって、PowerShell からリアルタイムPostgreSQL data に連携できます。データ同期などのタスクの連携にぴったりの製品です。 本記事では、PowerShell からCData Cmdlets for PostgreSQL およびCData Cmdlets for MySQL を使って、同期スクリプトを作成して実行します。

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

To connect to PostgreSQL, set the Server, Port (the default port is 5432), and Database connection properties and set the User and Password you wish to use to authenticate to the server. If the Database property is not specified, the data provider connects to the user's default database.

Collecting PostgreSQL Data

  1. Install the module:

    Install-Module PostgreSQLCmdlets
  2. Connect to PostgreSQL:

    $postgresql = Connect-PostgreSQL -User $User -Password $Password -Database $Database -Server $Server -Port $Port
  3. Retrieve the data from a specific resource:

    $data = Select-PostgreSQL -Connection $postgresql -Table "Orders"

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

    $data = Invoke-PostgreSQL -Connection $postgresql -Query 'SELECT * FROM Orders WHERE ShipCountry = @ShipCountry' -Params @{'@ShipCountry'='USA'}
  4. Save a list of the column names from the returned data.

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

Inserting PostgreSQL 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 PostgreSQL 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 PostgreSQL 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 PostgreSQL data to a MySQL database. This gives you freedom to work with PostgreSQL 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 PostgreSQL and MySQL in PowerShell, you can pipe command results to perform the replication in a single line:

    Select-PostgreSQL -Connection $postgresql -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 PostgreSQL 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-PostgreSQL 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')}
 
 
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