如何从spring boot应用程序调用oracle函数？

@Repository
public interface OracleFunctionRepository {
    @Procedure(name = "function_name", outputParameterName = "result")
    String callFunction(@Param("arg1") String arg1, @Param("arg2") String arg2);
}

@Service
public class OracleFunctionService {
    @Autowired
    private OracleFunctionRepository repository;

    public String callOracleFunction(String arg1, String arg2) {
        StoredProcedureQuery query = entityManager.createNamedStoredProcedureQuery("function_name");
        query.setParameter("arg1", arg1);
        query.setParameter("arg2", arg2);
        query.execute();

        return (String) query.getOutputParameterValue("result");
    }
}

@RestController
public class OracleFunctionController {
    @Autowired
    private OracleFunctionService service;

    @GetMapping("/call-function")
    public String callFunction(@RequestParam("arg1") String arg1, @RequestParam("arg2") String arg2) {
        return service.callOracleFunction(arg1, arg2);
    }
}