Why Does My Spring Data JPA @Query Update Not Work: The EntityManager Flush Mystery?

Spring Data JPA Update @Query Not Updating: The Flush Dilemma

When using @Query annotations for update operations in Spring Data JPA, it's crucial to understand the behavior of the EntityManager. By default, the EntityManager doesn't automatically flush changes to the database. This can lead to unexpected results, where updates appear to be ignored.

In the case of the provided code, the integration test failed because the changes made to the Admin entity were not flushed to the database after the update query. To resolve this issue, it's recommended to use the clearAutomatically = true option with the @Modifying annotation:

@Modifying(clearAutomatically = true)
@Transactional
@Query("UPDATE Admin SET firstname = :firstname, lastname = :lastname, login = :login, superAdmin = :superAdmin, preferenceAdmin = :preferenceAdmin, address =  :address, zipCode = :zipCode, city = :city, country = :country, email = :email, profile = :profile, postLoginUrl = :postLoginUrl WHERE id = :id")
public void update(@Param("firstname") String firstname, @Param("lastname") String lastname, ...);

By adding this option, the EntityManager will automatically flush the changes after the update query is executed, ensuring that they are persisted to the database.

Additional Observations:

• The limit 2 clause seen in the SQL statement for the findByEmail and findByLogin finders is a database-specific behavior when using a limiting clause with a WHERE IN query. Spring Data uses this behavior to optimize queries based on derived information.
• The difference between the behavior in MySQL and Java might be related to the use of different JDBC drivers or connection settings. Ensuring consistency between the driver and connection settings used in both environments is important.

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