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PONHibernate subquery when relation key is NULL, Count subquery
 

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  1. PONHibernate subquery when relation key is NULL, Count subquery
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    <p>I wont to get count of subselect. I have:</p> <pre><code>Class A { int Id {get;set;} ICollection&lt;B&gt; NameBs {get;set;} } Class B { int Id {get;set;} C NameC {get;set;} } Class C { int Id {get;set;} } </code></pre> <p>My mapping look like:</p> <pre><code>&lt;class name="A" table="A"&gt; &lt;id name="Id" ...&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;set name="NameBs" table="B" inverse="true" cascade="all-delete-orphan" batch-size="20"&gt; &lt;key column="id_A" not-null="true" /&gt; &lt;one-to-many class="B" /&gt; &lt;/set&gt; &lt;/class&gt; &lt;class name="B" table="B"&gt; &lt;id name="Id" ...&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;many-to-one name="NameC" column ="id_C"/&gt; &lt;/class&gt; &lt;class name="C" table="C"&gt; &lt;id name="Id" ...&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;/class&gt; </code></pre> <p>Select in C# code is:</p> <pre><code>var results = (from a in aRep.QueryAll() select new myObject{ Id = b.Id, Count = a.NameBs.Count(b=&gt;b.C == null) }).ToList(); </code></pre> <p>SQL Select is:</p> <pre><code>SELECT Id, (SELECT cast(count(* ) as INT) FROM B b_, C c_ WHERE b_.id_c = c_.id AND b_.id_a = a_.id AND (b_.id_c is null)) FROM A a_ </code></pre> <p>But I need this select:</p> <pre><code>SELECT Id, (SELECT cast(count(* ) as INT) FROM B b_ WHERE b_.id_a = a_.id AND (b_.id_c is null)) FROM A a_ </code></pre> <p>Can anyone Help me?</p> <p>I have try mapping like: <strong>fetch="join"</strong> in many-to-one property, but is not work.</p> <pre><code>&lt;class name="B" table="B"&gt; &lt;id name="Id" ...&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;many-to-one name="NameC" column ="id_C" fetch="join"/&gt; &lt;/class&gt; </code></pre>
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    1. CODoes it give the wrong results? The queries should give the same results, the only thing is that joining C is useless, but it should not give different results.
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    2. COYes, the results is different.
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