Java Hibernate createSqlQuery设置变量

我有一个类似这样的mysql查询来获取行号

set @rank = 0; 
select @rank := @rank + 1 as rank,id,name from test

在hibernate 3中，“：=”是一个问题

session.createSQLQuery("set @rank = 0; 
                        select @rank := @rank + 1 as rank,id,name from test");

我切换到Hibernate3到4，并使用转义字符

session.createSQLQuery("set @rank = 0; 
                        select @rank \\:= @rank + 1 as rank,id,name from test");

现在发生了另一个异常。它给出了例外情况：

"Parameter rank does not exist as a named parameter" 

You have an error in your SQL syntax; check the manual that corresponds to 
your MySQL server version for the right syntax to use near ':= 0 + 1 as rank,id,
name from test' at line 1

我试过这个：

 session.createSQLQuery("select :rank \\:= :rank + 1 as rank,
                         ID,NAME,SURNAME from test").setInteger("rank", 0)

这一次，它给出了以下例外情况：

"Parameter rank does not exist as a named parameter" 

You have an error in your SQL syntax; check the manual that corresponds to 
your MySQL server version for the right syntax to use near ':= 0 + 1 as rank,id,
name from test' at line 1

---

知道如何解决这个问题吗？

Hibernate不支持特定于数据库的SQL语法或SQL局部变量

据我所见，您甚至不想选择某个实体，因此您只需要一个聚合查询：

select count(t), t.id, t.name 
from Test t
group by t.id, t.name

---

假设您有一个映射到测试表的测试实体。

使用doReturningWork时，您可以访问普通JDBC连接。 然后，应将SQL拆分为2个执行集，并选择：

final Object queryResultObject = session.doReturningWork(new ReturningWork<ReturnObjectType>() {

  @Override
  public ReturnObjectType execute(Connection connection) throws SQLException {

    final Statement statement = connection.createStatement();
    statement.execute("set @rank = 0");

    final ResultSet resultSet = statement.executeQuery(
                                      "select @rank := @rank + 1 as rank,id,name
                                       from test");

    ReturnObjectType result = /* transform ResultSet into return value */

    return result;
  }
});

---

您确定不能在hibernate中使用局部变量吗？这很可悲。你总是可以使用原生SQL，即使是Hibernate，所以你可以试试。我不明白你的意思。我想我在createSQLQuery中使用了本机SQL。请您解释一下您的评论好吗？检查以访问当前连接，在那里您可以编写普通的旧JDBC。我尝试了doReturningWork仍然不允许我使用本地sql变量