[英]Complex nHibernate QueryOver expression
I have the following objects in a hierarchy A > B > C > D
. 我在层次结构
A > B > C > D
有以下对象。 Each object is mapped to a table. 每个对象都映射到一个表。 I'm trying to write the following SQL using QueryOver:
我正在尝试使用QueryOver编写以下SQL:
SELECT B
FROM A, B, C, D
WHERE A.ID = B.ID
AND B.ID = C.ID
AND C.ID = D.ID
WHERE A.NUMBER = 'VALUE'
AND D.NAME IN ('VALUE1', 'VALUE2')
I have the C# code so far: 到目前为止,我有C#代码:
string[] entityNames = entityAttributes.Select(e => e.Name).ToArray();
string customerNumber = 2;
return session.QueryOver<B>()
.JoinQueryOver(b => b.C)
.JoinQueryOver(c => c.D)
.WhereRestrictionOn(d => d.Name).IsIn(entityNames)
.List<B>();
What's missing here is the A > B
link. 这里缺少的是
A > B
链接。 I cannot figure out how to add the join to A
restricting it on the NUMBER
field. 我无法弄清楚如何将连接添加到
A
限制它在NUMBER
字段上。 I tried the following but the .JoinQueryOver(b => bC)
is looking for type A
instead of finding type B
. 我尝试了以下但
.JoinQueryOver(b => bC)
正在寻找类型A
而不是查找类型B
return session.QueryOver<B>()
.JoinQueryOver(b => b.A)
.Where(a => a.Number == customerNumber)
.JoinQueryOver(b => b.C) **//Looks for type A instead of B**
.JoinQueryOver(c => c.D)
.WhereRestrictionOn(d => d.Name).IsIn(entityNames)
.List<B>();
How can I add type A
to this query while still returning type B
? 如何在仍返回类型
B
同时向此查询添加类型A
?
you can use Aliases to join your table like 你可以使用别名加入你的表格
B tB = null;
A tA = null;
C tC = null;
D tD = null;
var qOver = HibSession.QueryOver<B>(() => tB)
.JoinAlias(() => tB.A, () => tA, JoinType.LeftOuterJoin)
.Where(() => tA.Number == customerNumber)
.JoinAlias(() => tB.C, () => tC, JoinType.LeftOuterJoin)
.JoinAlias(() => tC.D, () => tD, JoinType.LeftOuterJoin)
.Where(Restrictions.On(() => tD.Name).IsIn(entityNames))
.List<B>();
I hope it's helpful. 我希望它有用。
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