Question

我的问题非常像Getting the return value of a PL/SQL function via Hibernate

我有一个在内部进行一些修改的函数，它返回一个值。

最初的想法是做这样的事情：

protected Integer checkXXX(Long id, Long transId)
        throws Exception {
    final String sql = "SELECT MYSCHEMA.MYFUNC(" + id + ", "
            + transId + ") FROM DUAL";
    final BigDecimal nr = (BigDecimal) this.getHibernateTemplate()
            .getSessionFactory().getCurrentSession().createSQLQuery(sql)
            .uniqueResult();
    return nr.intValue();
}

不幸的是，这不适用于Oracle。做这样的事情的推荐方法是什么？

有没有办法从我的声明中提取声明的变量？

Answer 1

Hibernate Session提供doWork()方法，可让您直接访问java.sql.Connection。然后，您可以创建并使用java.sql.CallableStatement来执行您的功能：

session.doWork(new Work() {
  public void execute(Connection connection) throws SQLException {
    CallableStatement call = connection.prepareCall("{ ? = call MYSCHEMA.MYFUNC(?,?) }");
    call.registerOutParameter( 1, Types.INTEGER ); // or whatever it is
    call.setLong(2, id);
    call.setLong(3, transId);
    call.execute();
    int result = call.getInt(1); // propagate this back to enclosing class
  }
});

Answer 2

我写了an article about various ways of calling Oracle stored procedures and functions from Hibernate所以总结一下，你有以下选择：

使用@NamedNativeQuery：

@org.hibernate.annotations.NamedNativeQuery(
    name = "fn_my_func",
    query = "{ ? = call MYSCHEMA.MYFUNC(?, ?) }",
    callable = true,
    resultClass = Integer.class
)

Integer result = (Integer) entityManager.createNamedQuery("fn_my_func")
    .setParameter(1, 1)
    .setParameter(2, 1)
    .getSingleResult();

使用JDBC API：

Session session = entityManager.unwrap( Session.class );

final AtomicReference<Integer> result = 
    new AtomicReference<>();

session.doWork( connection -> {
    try (CallableStatement function = connection
            .prepareCall(
                "{ ? = call MYSCHEMA.MYFUNC(?, ?) }"
            )
        ) {
        function.registerOutParameter( 1, Types.INTEGER );
        function.setInt( 2, 1 );
        function.setInt( 3, 1 );
        function.execute();
        result.set( function.getInt( 1 ) );
    }
} );

使用本机Oracle查询：

Integer result = (Integer) entityManager.createNativeQuery(
    "SELECT MYSCHEMA.MYFUNC(:id, :transId) FROM DUAL")
    .setParameter("postId", 1)
    .setParameter("transId", 1)
    .getSingleResult();

Answer 3

是的，您确实需要使用out参数。如果你使用doWork（）方法，你会做这样的事情：

session.doWork(new Work() {
   public void execute(Connection conn) {
      CallableStatement stmt = conn.prepareCall("? = call <some function name>(?)");
      stmt.registerOutParameter(1, OracleTypes.INTEGER);
      stmt.setInt(2, <some value>);
      stmt.execute();
      Integer outputValue = stmt.getInt(1);
      // And then you'd do something with this outputValue
   }
});

Answer 4

替代代码：）

如果您想要直接结果，可以使用以下代码

 int result = session.doReturningWork(new ReturningWork<Integer>() {
  @Override
   public Integer  execute(Connection connection) throws SQLException {
    CallableStatement call = connection.prepareCall("{ ? = call MYSCHEMA.MYFUNC(?,?) }");
    call.registerOutParameter( 1, Types.INTEGER ); // or whatever it is
    call.setLong(2, id);
    call.setLong(3, transId);
    call.execute();
    return call.getInt(1); // propagate this back to enclosing class
  }
});

http://keyurj.blogspot.com.tr/2012/12/dowork-in-hibernate.html

Answer 5

public static void getThroHibConnTest() throws Exception {
    logger.debug("UsersActiion.getThroHibConnTest() | BEG ");
    Transaction tx = null;
    Connection conn = null;
    CallableStatement cs = null;
    Session session = HibernateUtil.getInstance().getCurrentSession();
    try {
        tx = session.beginTransaction();
        conn = session.connection();

        System.out.println("Connection = "+conn);
        if (cs == null)
        {
            cs = 
                conn.prepareCall("{ ?=call P_TEST.FN_GETSUM(?,?) }");
        }
        cs.clearParameters();
        cs.registerOutParameter(1,OracleTypes.INTEGER);
        cs.setInt(2,1);
        cs.setInt(3,2);
        cs.execute();
        int retInt=cs.getInt(1);
        tx.commit();            
    }catch (Exception ex) {  
        logger.error("UsersActiion.getThroHibConnTest() | ERROR | " , ex);  
        if (tx != null && tx.isActive()) {
            try {
                // Second try catch as the rollback could fail as well
                tx.rollback();
            } catch (HibernateException e1) {
                logger.debug("Error rolling back transaction");
            }
            // throw again the first exception
            throw ex;
        }
    }finally{
        try {
            if (cs != null) {
                cs.close();
                cs = null;
            }
            if(conn!=null)conn.close();

        } catch (Exception ex){;}
    }
    logger.debug("UsersActiion.getThroHibConnTest() | END ");
}

如何使用返回参数从Hibernate调用Oracle函数？

5 个答案: