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PONHibernate: Double nested subqueries and "Could not find a matching criteria info provider..."
 

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  1. PONHibernate: Double nested subqueries and "Could not find a matching criteria info provider..."
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    <p>I am having trouble working out how to get the following sql into an NHibernate ICriteria:</p> <pre><code>select * from Contract contract_outer where exists ( select 1 from RequiredDocRules where not exists ( select 1 from Contract contract_inner inner join ContractDocs contractDocs on cDocs.ContractId = c_inner.Id inner join Doc doc doc.Id = contractDocs.DocId where contract_inner.Id = contract_outer.Id and doc.Type = RequiredDocRules.DocType) ) and RequiredDocRules.ContractType = contract_outer.Type ) </code></pre> <p>Basically, the query is saying "Show me contracts that are missing required documents, based on the rules for this type of contract".</p> <p>The CreateCriteria looks like this:</p> <pre><code>var subqueryB = DetachedCriteria.For&lt;Contract&gt;("contract_inner") .CreateAlias("contract_inner.Docs", "doc") .Add(Restrictions.EqProperty("doc.Type", "rule.DocType")) .Add(Restrictions.EqProperty("contract_inner.Id", "contract_outer.Id") .SetProjection(Projections.Id()); var subqueryA = DetachedCriteria.For&lt;RequiredDocRule&gt;("rule") .Add(Restriction.EqProperty("rule.ContractType", "contract_outer.Type")) .Add(Subqueries.NotExists(subqueryB)) .SetProjection(Projections.Id()); return Session.CreateCriteria&lt;Contract&gt;("contract_outer") .Add(Subqueries.Exists(subqueryA)) .List&lt;Contract&gt;(); </code></pre> <p>This above code throws the following obscure exception:</p> <blockquote> <p>Could not find a matching criteria info provider to: contract_inner.Id = contract_outer.Id and doc.Type = rule.DocType</p> </blockquote> <p>I've narrowed the issue down to the "contract_inner.Id = contract_outer.Id" restriction. Maybe it is having trouble traversing up through two layers of subqueries?</p> <p>I am using NHibernate 2.1 btw.</p> <p>I seem to be the only person getting this exception - if you google for the exception message another one of my Stackoverflow posts comes up number one. This question is similar, but different. So frustrating!</p>
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    1. COany particular reason to use Criteria and not HQL here?
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      1. USDiego Mijelshon
    2. COJust for consistency across the repository. Its a pain getting to the end of writing the query then finding it doesn't work and having to convert it all over to HQL.
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    3. COhave you considered using Linq2Nhibernate ? take a look at this post :http://stackoverflow.com/questions/624609/linq-to-nhibernate
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