Question

我有以下方法。返回“无法执行更新查询”。如果我查询另一个实体属性，即“Order.Campaign.Id”，我是否需要包括一个连接？这会怎么样？？

public void RemoveOrderItems(int companyId, int campaignId, int productId, int orderStatus)
{
    using (ITransaction transaction = _session.BeginTransaction())
    {
        _session.CreateQuery("delete from OrderItem where Product.Id = '" + productId + "' and Order.Company.Id = '" + companyId + "' and Order.Campaign.Id = '" + campaignId + "' and Order.OrderStatus = '" + orderStatus + "'").ExecuteUpdate();
        transaction.Commit();
    }
}

**编辑**

这是sql语句。

DELETE oi
FROM OrderItems oi inner JOIN  Orders o On oi.OrderId = o.Id
Where oi.ProductId = '13077' and o.CompanyId = '32' and o.CampaignId = '2' and o.OrderStatus = 3

Answer 1

_session.CreateQuery(@"
    delete OrderItem oi
    where oi in
         (select i
          from OrderItem i
          where i.Product.Id = :productId
          and i.Order.Company.Id = :companyId
          and i.Order.Campaign.Id :campaignId
          and i.Order.OrderStatus = :orderStatus)
    ")
    .SetParameter("productId", productId)
    .SetParameter("companyId", companyId)
    .SetParameter("campaignId", campaignId)
    .SetParameter("orderStatus", orderStatus)
    .ExecuteUpdate();

生成的SQL与完全完全与您手动创建的相同，但它在语义上是等效的。

Answer 2

sql语句无效，where语句不正确。尝试在Microsoft SQL Server Management Studio中编写查询，然后使用params将其重写为CreateQuery。

Answer 3

在SQL Server Management studio中找到正确的查询，并在执行类似我的示例之后（查询可以更加困难，当然还有join，subquery）

ISession session = SessionFactory.GetCurrentSession();
using (var tx = session.BeginTransaction())
{
    try
    {
        IQuery myQuery = session.CreateQuery("DELETE FROM TableA c WHERE c.Field1 = :Filed1Value and c.Field2 = :Field2 ")
            .SetParameter("Field1", 25)
            .SetParameter("Field2", "Test")
        myQuery.ExecuteUpdate();
        tx.Commit();
    }
    catch (Exception)
    {
        tx.Rollback();
    }
}

如何使用带有连接的地方使用nhibernate删除

3 个答案: