HQL中的分区上的row_number() [英] row_number() over partition in hql

问题描述

hql中的分区上的row_number()等价于什么 我在hql中有以下查询:

What is the equivalent of row_number() over partition in hql I have the following query in hql:

select s.Companyname, p.Productname, sum(od.Unitprice * od.Quantity - od.Discount) as SalesAmount FROM OrderDetails as od inner join od.Orders as o inner join od.Products as p " +
                                                              "inner join p.Suppliers as s" +
                                                      " where o.Orderdate between '2010/01/01' and '2014/01/01' GROUP BY s.Companyname,p.Productname"

我想按s.Companyname进行分区，其中RowNumber <= n.

I want to do partition by s.Companyname where RowNumber <= n.

推荐答案

据我所知，在 JPQL .我建议使用原生SQL 查询在这种情况下:

As far as I know you cannot use row_number() neither in HQL nor in JPQL. I propose to use a native SQL query in this case:

@PersistenceContext
protected EntityManager entityManager;
...

    String sQuery = "SELECT q.* FROM (" +
            "SELECT s.company_name, " +
               "p.product_name, " +
               "sum(od.unit_price * od.quantity - od.discount) as SalesAmount, " +
               "row_number() OVER (partition by s.company_name) as rn " +
            "FROM OrderDetails od " +
            "INNER JOIN Orders o ON o.id = od.order_id " +
            "INNER JOIN Products p ON p.id = od.product_id " +
            "INNER JOIN Suppliers s ON s.id = p.supplier_id " +
            "WHERE o.order_date between '2010/01/01' and '2014/01/01') as q " +
        "WHERE rn <= :n";

    List<ResultDbo> results = new ArrayList<>();
    Query query = entityManager.createNativeQuery(sQuery);
    query.setParameter("n", n);
    List<Object[]> resultSet = query.getResultList();
    for (Object[] resultItem : resultSet) {
        ResultDbo result = new ResultDbo();
        result.setCompanyName((String) resultItem[0]);
        result.setProductName((String) resultItem[1]);
        result.setSalesAmount((String) resultItem[2]);
        results.add(result);
    }

如果您尝试在HQL中使用OVER()，几乎可以肯定会得到一些验证异常，例如java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: OVER near line 1, column 42 ...

If you ever try to use OVER() in HQL you'll almost certainly get some validation exception like java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: OVER near line 1, column 42 ...

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