PowerShell Scripting to Replicate Snowflake Data to MySQL

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

Getting Started

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

To connect to Snowflake:

1. Set User and Password to your Snowflake credentials and set the AuthScheme property to PASSWORD or OKTA.
2. Set URL to the URL of the Snowflake instance (i.e.: https://myaccount.snowflakecomputing.com).
3. Set Warehouse to the Snowflake warehouse.
4. (Optional) Set Account to your Snowflake account if your URL does not conform to the format above.
5. (Optional) Set Database and Schema to restrict the tables and views exposed.

See the Getting Started guide in the CData driver documentation for more information.

Collecting Snowflake Data

1. Install the module:

   Install-Module SnowflakeCmdlets

2. Connect to Snowflake:

   $snowflake = Connect-Snowflake -User $User -Password $Password -Server $Server -Database $Database -Warehouse $Warehouse -Account $Account

3. Retrieve the data from a specific resource:

   $data = Select-Snowflake -Connection $snowflake -Table "Products"

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

   $data = Invoke-Snowflake -Connection $snowflake -Query 'SELECT * FROM Products WHERE Id = @Id' -Params @{'@Id'='1'}

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

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

Inserting Snowflake 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 Snowflake 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 Snowflake resource (Products) and to exist in the database.

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

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

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

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