Question

我有这个表结构：

     ReferralSource - main table
      -Phone - join table Rs as one-to-one
         - Carrier - child table for Phone
         - Type    - child table for Phone

我想通过Linq查询得到它：

Session.Query<ReferralSource>()                
            .Fetch(x => x.Phone)
            .ThenFetch(x => x.Type)
            .Fetch(x => x.Phone)
            .ThenFetch(x => x.Carrier);

此查询获取此SQL代码：

  select referralso0_.Id,                        
               referralso0_.FirstName,                   
               phonetype4_.TypeName
               carrier6_.Name                  
        from   REFERRALSOURCES referralso0_                  
               left outer join PHONES phone3_
                 on referralso0_.PhoneId = phone3_.Id
               left outer join PHONETYPES phonetype4_
                 on phone3_.TypeId = phonetype4_.Id 
           - duplicated join started
           left outer join PHONES phone5_
             on referralso0_.PhoneId = phone5_.Id
           left outer join CARRIERS carrier6_
             on phone5_.CarrierId = carrier6_.Id - duplicated join finished

如何使用fetch删除重复的左连接？

Answer 1

如果您将Phone映射为组件而不是实体

，则可能

public ReferralSourceMap()
{
    Join("Phones", join =>
    {
        join.KeyColumn("...");
        join.Component(x => x.Phone, c => { ... });
    });
}

编辑：不幸的是，只有使用Criteria和QueryOver才能使用LINQ2NHibernate。我应该删除答案吗？

我们如何获取多个孙子集合

1 个答案: