Converting SYS_REF_CURSOR to a Java List in Spring Boot

Discover effective methods for converting `SYS_REF_CURSOR` from stored procedures into Java Lists in Spring Boot, ensuring data retrieval works seamlessly.
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Introduction

If you’re a Java developer encountering issues while trying to convert a SYS_REF_CURSOR from a stored procedure into a Java List using Spring Boot, you are not alone. This problem often arises due to misunderstandings in how JDBC interacts with stored procedures and the types used in JPA (Java Persistence API). In this guide, we will explore a detailed solution to this problem, allowing you to successfully convert your SYS_REF_CURSOR into a usable List in your application.

Understanding the Problem

You might have set up a stored procedure in Oracle that uses SYS_REFCURSOR as an output parameter. However, when you try to retrieve the results in your Spring Boot application, you find that the List you expect is coming back as null, despite the stored procedure executing correctly and returning data when you test it in an SQL developer.

This issue typically stems from the mismatch in configured types and the incorrect handling of the stored procedure's response.

Solution Overview

To properly convert a SYS_REFCURSOR into a Java List in your Spring Boot application, you need to make a few adjustments in your code as follows:

Step 1: Update Your Stored Procedure Configuration

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

Step 2: Retrieve the ResultSet in Your Service Class

Once the stored procedure is configured correctly, you can retrieve the result set as follows in your service class:

Use the EntityManager to create an instance of the stored procedure query with the name you defined.

Set the input parameter (in this case, INPUT_DATE).

Execute the query and retrieve the results directly into a List.

Here is a sample code snippet demonstrating this:

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

Important Notes

Testing: It is crucial to test your implementation to ensure that the List is populated as expected. You might want to run this in a controlled environment before deploying it to production.

Exception Handling: Ensure you have appropriate error handling in place to catch potential SQL exceptions, particularly when dealing with database calls.

Conclusion

By properly configuring your stored procedure and adapting your service logic to handle the ResultSet correctly, you can effectively convert a SYS_REF_CURSOR into a Java List in your Spring Boot application. Implementing these changes will greatly enhance your ability to work with database results seamlessly.

If you have questions or run into any issues implementing this solution, feel free to reach out or leave a comment below.