How to call a stored procedure from Java and JPA

java

jpa

stored-procedures

callablestatement

byAlex Kataev·Dec 15, 2024

Effectively call a JPA stored procedure using EntityManager.createStoredProcedureQuery(). Configure your parameters with registerStoredProcedureParameter() and assign them values using setParameter().

EntityManager em = ...; // Get EntityManager, control center at your service!
StoredProcedureQuery spQuery = em.createStoredProcedureQuery("procedureName");
spQuery.registerStoredProcedureParameter(1, String.class, ParameterMode.IN);
spQuery.setParameter(1, "inputValue"); // Put in your secret code here
spQuery.execute(); // Press the big red button. Kaboom!

Substitute "procedureName" and "inputValue" with your procedure name and respective argument. Bingo!

Deciphering the JPA stored procedure call

Launching the task: EntityManager, StoredProcedureQuery

The EntityManager, your main man in JPA, gets the StoredProcedureQuery via createStoredProcedureQuery. It's like calling tech support - you need the right number!

Passing the torch: Parameter Registration and Binding

registerStoredProcedureParameter is your roadmap, marking where to insert your parameters like dropping a pin on a GPS. Follow up with setParameter to assign your values, like coordinates for your destination.

Setting things in motion: Execution

Ready for lift-off? execute() puts your code in action. Sit back and watch the magic happen.

Fetching the treasure: Result Retrieval

If your procedure returns results, you need getOutputParameterValue to recover the treasure. Think of it as the golden ticket emerging from the slot machine.

Dealing with multi-result scenarios

In case your procedure returns multiple results, worry not! Just use getResultList or getSingleResult if you're expecting a solo response. It's like dealing with twins, double or single, you've got this!

Wrestling with complex result sets

Got complex result sets? Think SYS_REFCURSOR with StoredProcedureQuery. It's like grappling with a Rubik's cube, but you've got the rules in your corner.

Engaging stored functions using createNativeQuery

If you're dealing with a stored function, use createNativeQuery, think of it as pulling the right string in a puppet show.

Choosing between JPA's StoredProcedureQuery and JDBC's CallableStatement

If StoredProcedureQuery feels too high-level, pick up CallableStatement. It's the Swiss army knife in your JDBC toolkit.

SQL functions in your Spring garden: the Spring Data JPA's @Procedure

Protected under the Spring Data JPA's umbrella? Just use the @Procedure annotation to call your procedures, like calling out to your pets in your garden.

Journey through best practices and detours

Making use of named stored procedures

@NamedStoredProcedureQuery makes a procedure readable and persistent in JPA 2.1. It's like naming your houseplants. They appreciate it!

Dealing with the peculiarities of persistence providers

Some persistence providers offer additional treasures. But remember, all that glitters is not gold! Stay cautious of features tying you to specific providers.

Navigating with eclipselink

In the deep, dark trenches of EclipseLink, consider enlisting the help of StoredProcedureCall and DataReadQuery. Never fear, the Session.executeQuery method will light the way.

Harnessing the knowledge realm

From the holy documentation to the deep insights of vladmihalcea.com, knowledge is power! Unearth the arcane wisdom to master JPA and stored procedures.