Grokking Microservices Design Patterns
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Database per Service: An Example

The last lesson covered the architecture choices inside the pattern. This lesson shows the pattern in working code. We build one small feature: an order details page that shows product names next to quantities.

The Setup

Our example has two services, and each one owns its own data store.

  • OrderService owns two PostgreSQL tables, orders and order_lines. One order row has many order line rows. PostgreSQL is a relational database.
  • CatalogService owns a MongoDB collection (MongoDB's version of a table) named products. MongoDB is a document database.

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