Spring Data JPA NamedStoredProcedureQuery多个输出参数

Question

我有一个简单的存储过程,我用它来测试Spring Data JPA存储过程功能.

create or replace procedure plus1inout (arg in int,res1 out int,res2 out int) is
BEGIN   
 res1 := arg + 1; 
 res2 := res1 + 1;
END;

我的代码是:

@Repository
public interface AdjudConverDateSPRepository extends JpaRepository<AdjudConverDateSP, Long> {
    @Procedure(name = "plus1")
    Object[] plus1(@Param("arg") Integer arg);
}

@Entity
@NamedStoredProcedureQuery(name = "plus1", procedureName = "ADJUD.PLUS1INOUT",
        parameters = {
        @StoredProcedureParameter(mode = ParameterMode.IN, name = "arg", type = Integer.class),
        @StoredProcedureParameter(mode = ParameterMode.OUT, name = "res1", type = Integer.class),
        @StoredProcedureParameter(mode = ParameterMode.OUT, name = "res2", type = Integer.class)
})
public class AdjudConverDateSP implements Serializable {
        //stub to satisfy hibernate identifier requirement
        @Id @GeneratedValue
        private Long id;

}

当我有一个OUT参数时,一切正常.但是一旦我添加了第二个OUT参数,我得到一个异常,说它无法在实体中找到该过程.

Caused by:
  org.springframework.data.mapping.PropertyReferenceException: No property plus1 found for type AdjudConverDateSP!  at
  org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:75) at 
  org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:327) at
  org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:307) at
  org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:270) at
  org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:241) at
  org.springframework.data.repository.query.parser.Part.<init>(Part.java:76) at
  org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:235) at
  org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:373) at
  org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:353)

Answer 1

看起来@Procedure只需要一个直接绑定到方法返回类型的OUT参数...

要处理多个OUT参数,您可以直接使用JPA API:

StoredProcedureQuery proc = em.createNamedStoredProcedureQuery("plus1");

proc.setParameter("arg", 1);
proc.execute();
Integer res1 = (Integer) proc.getOutputParameterValue("res1");
Integer res2 = (Integer) proc.getOutputParameterValue("res2");
...

Answer 2

您可以使用注释中的outputParameterName参数指定返回多个输出参数之一，@Procedure如下所示：

@Repository
public interface AdjudConverDateSPRepository extends JpaRepository<AdjudConverDateSP, Long> {
    @Procedure(name = "plus1", outputParameterName = "res2")
    Integer plus1(@Param("arg") Integer arg);
}

更新 2019-06-24：

Spring Data JPA 2.2-RC1 现在支持多个输出参数 https://spring.io/blog/2019/06/17/spring-data-moore-rc1-and-lovelace-sr9-released

https://jira.spring.io/browse/DATAJPA-707

接口方法只需要有一个 Map 返回类型，以便可以通过键名访问每个输出参数：

@Repository
public interface AdjudConverDateSPRepository extends JpaRepository<AdjudConverDateSP, Long> {
    @Procedure(name = "plus1")
    Map<String, Object> plus1(@Param("arg") Integer arg);
}