tl;dr Copies data and related data from one SQL store to another. Includes an intermediate JSON format!

In order to use CopyQL, you must have a YAML configuration in your working directory copyql.yaml. This defines things like custom relationships and the connections between your remote and local data stores.

• source|destination - defines the SQL connections
  • host - the host of the database (defaults to localhost)
  • port - the port of the database (defaults to 3306)
  • user - the connecting user (defaults to root)
  • password - the password for the user
  • database - the database to use when connecting (required)
• relations - defines custom relationships. This is a list of key-value pairs that map columns. For example, books.old_library_id: libraries.id

copyql [options] <table>.<column>:<value>

When copying, it is required to provide an entry point. This could be something like libraries.id:1234 and it will copy the library with the id 1234 and all related data, including books and their related authors.

• --out - a JSON file to dump the contents. If this option is specified, no data will be copied to the destination SQL data store.
• --in - a JSON file to read the contents from. If this option is specified, data will not be gathered from the source database.
• --config, -c - the location of a custom configuration file. Defaults to copyql.yaml in the working directory.

It is often useful to have real (scrubbed) data when developing, adding features, and performance testing. Having this data locally can greatly speed up development time. However, in bigger systems, the data store is generally too large to copy the entire store locally.

That's where CopyQL comes in.

CopyQL builds relationships based on manual configuration and automatic naming conventions. Below is an example of the relationships it looks for automatically.

+-----------+     +------------+     +---------+
| libraries <--+  | books      |  +--> authors |
+-----------+  |  +------------+  |  +---------+
| id        |  |  | id         |  |  | id      |
| name      |  +--+ library_id |  |  | name    |
| owner     |     | title      |  |  +---------+
+-----------+     | author_id  +--+
                  +------------+

We welcome pull requests and suggestions! 👍

• Add manual relationship configuration
• Improve data inserting to avoid column not found and duplicate key errors
• Add ability to set automatic relationship patterns