How do you write custom queries in JPA?
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In JPA (Java Persistence API), custom queries are written using JPQL (Java Persistence Query Language) or native SQL. JPQL is object-oriented and works with entity classes and their fields instead of directly on database tables.
You can define custom queries in two main ways:
Using @Query Annotation (Spring Data JPA)
@Query("SELECT u FROM User u WHERE u.email = :email")
User findByEmail(@Param("email") String email);
Here, JPQL retrieves the User entity where the email field matches the given parameter.
Named Queries
Defined at the entity level:
@NamedQuery(
name = "User.findByStatus",
query = "SELECT u FROM User u WHERE u.status = :status"
)
Then used in code with entityManager.createNamedQuery("User.findByStatus").
Native SQL Queries
For direct database-specific queries:
@Query(value = "SELECT * FROM users WHERE status = ?1", nativeQuery = true)
List<User> findByStatus(String status);
Custom queries are powerful for complex conditions, joins, or aggregations. Use JPQL for portability and native queries for performance-tuned SQL.
👉 Would you like me to also include a short example with JOIN query in JPA to make it more practical?
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