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Discover how to keep your lastModifiedDate from updating when other fields change in Spring Data JPA.
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Exclude Fields from Audit in Spring Data JPA with @ LastModifiedDate

In the realm of Java application development, using frameworks such as Spring Data JPA can accelerate your workflow and simplify database interactions. However, sometimes situations arise that require developers to take a step back and reconsider how updates can affect their data models. One common issue faced by developers is managing timestamps that inadvertently get updated when certain fields are modified.

The Problem

Consider a scenario where you have an entity called User. This entity has several fields, one of which is the lastModifiedDate:

[[See Video to Reveal this Text or Code Snippet]]

This field is automatically populated with the current timestamp whenever the table is updated, which is a common requirement for tracking changes.

However, your User entity also includes a loginTime field:

[[See Video to Reveal this Text or Code Snippet]]

The loginTime field is updated every time a user logs into the application. The problem arises when logging in: the act of updating loginTime also results in the lastModifiedDate field being updated, even though you may not want that to happen.

This can lead to incorrect audit data, where the last modified date does not accurately reflect the actual updates made to the entity. So, how can we prevent the lastModifiedDate from being updated whenever specific fields, like loginTime, are altered?

The Solution

Using JPQL Update Query

To solve this issue, you can utilize JPQL (Java Persistence Query Language) along with the @ Query annotation to perform targeted updates. The goal is to update only the loginTime field without altering the lastModifiedDate field.

Here’s how to implement this in your repository interface:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of The Code

@ Modifying: This annotation indicates that the query is modifying data, not just reading it.

@ Query: This specifies the JPQL query to execute, which updates only the loginTime field for the user with the specified id.

@ Param: This annotation binds method parameters to the named parameters in the JPQL.

Steps to Use the Update Method

Create a Repository: If you do not have one already, create a repository interface that extends JpaRepository for your User entity.

Define the Update Method: Add the update method as shown above in your repository interface.

Call the Update Method: Whenever a user logs in, call this repository method, passing the new loginTime and the user's id. This ensures that lastModifiedDate is not altered.

Conclusion

By implementing a JPQL update query with the @ Query annotation, you can effectively manage which fields trigger an update to the lastModifiedDate in your Spring Data JPA entities. This approach keeps your auditing clean and separates concerns within your application logic.

With this solution, you can now update loginTime whenever users log in without worrying about unintended changes to your lastModifiedDate. Happy coding!