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Derived Query Methods in Repositories

Explore how to implement derived query methods in Spring Data JPA repositories. Understand the naming conventions for dynamic queries, including findBy, findAllBy, countBy, and deleteBy, to efficiently fetch, count, and delete records based on entity properties. Learn to combine criteria for complex queries to enhance database integration in your Spring applications.

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Derived query methods are dynamic methods provided by Spring Data to operate based on the criteria. The naming convention used for a derived method helps Spring Data JPA identify the action and the conditions for the query. Therefore, the name contains two parts— an introducer and a criteria separated by the first By keyword.

  • The introducer, such as find, count, and delete, tells Spring Data JPA the action to be done.
  • After the By keyword, Spring Data JPA expects conditions like Equals, GreaterThan, and After on
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