CData Cmdlets for Teradata をつかって、PowerShell からリアルタイムTeradata 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 Teradata 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 Teradata data in PowerShell and preparing for replication consists of four basic steps.
Teradata に接続するには、次の認証情報を提供し、データベースサーバー名を指定します。
Install the module:
Install-Module TeradataCmdlets
Connect to Teradata:
$teradata = Connect-Teradata -User $User -Password $Password -Server $Server -Database $Database
Retrieve the data from a specific resource:
$data = Select-Teradata -Connection $teradata -Table "NorthwindProducts"
You can also use the Invoke-Teradata cmdlet to execute pure SQL-92 statements:
$data = Invoke-Teradata -Connection $teradata -Query 'SELECT * FROM NorthwindProducts WHERE CategoryId = @CategoryId' -Params @{'@CategoryId'='5'}
Save a list of the column names from the returned data.
$columns = ($data | Get-Member -MemberType NoteProperty | Select-Object -Property Name).Name
With the data and column names collected, you are ready to replicate the data into a MySQL database.
Install the module:
Install-Module MySQLCmdlets
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
Loop through the Teradata 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 Teradata resource (NorthwindProducts) and to exist in the database.
$data | % {
$row = $_
$values = @()
$columns | % {
$col = $_
$values += $row.$($col)
}
Add-MySQL -Connection $mysql -Table "NorthwindProducts" -Columns $columns -Values $values
}
You have now replicated your Teradata data to a MySQL database. This gives you freedom to work with Teradata data in the same way that you work with other MySQL tables, whether that is performing analytics, building reports, or other business functions.
Once you have connected to Teradata and MySQL in PowerShell, you can pipe command results to perform the replication in a single line:
Select-Teradata -Connection $teradata -Table "NorthwindProducts" | % {
$row = $_
$values = @()
$columns | % {
$col = $_
$values += $row.$($col)
}
Add-MySQL -Connection $mysql -Table "NorthwindProducts" -Columns $columns -Values $values
}
If you wish to replicate the Teradata 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-Teradata 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')}