Should You Use JPA or CallableStatement When Calling Stored Procedures in Java?

Calling Stored Procedures in Java Using JPA

Calling stored procedures from Java applications is a common task in database connectivity. This article explores two methods for accomplishing this: JPA and CallableStatement.

Should You Use JPA or CallableStatement?

Both JPA and CallableStatement can be used to call stored procedures, but each has its advantages.

• JPA (Java Persistence API) provides a standardized approach to database operations. It supports named parameters, parameter mapping, and automatic result set mapping. This makes it easier to write and maintain code.
• CallableStatement is a more direct approach that allows you to specify the SQL statement directly. It provides more control over the stored procedure call but requires more manual parameter handling and result set mapping.

In the context of your web application, which retrieves employee details based on employee ID and company ID, JPA is a more suitable choice due to its simplicity and ease of use.

SQL Statement for Stored Procedure Invocation

The following SQL statement can be used to call the stored procedure:

{call getEmployeeDetails(?,?)}

This statement uses positional parameters, so the employee ID should be provided as the first parameter and the company ID as the second parameter.

Example Java Code Using JPA

Query query = em.createNativeQuery("{call getEmployeeDetails(?,?)}",
        EmployeeDetails.class)
        .setParameter(1, employeeId)
        .setParameter(2, companyId);

List<EmployeeDetails> result = query.getResultList();

In this example, the query is created using the createNativeQuery method and specified to return EmployeeDetails instances. The employee ID and company ID are set using the setParameter method.

• Ensure that the EmployeeDetails class is defined with the @Entity and @Table annotations.
• The getResultList method is used to retrieve the result set, and the getEmployeeDetails stored procedure will be executed during this call.

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