[nhibernate-issues] [NHJIRA] Updated: (NH-2500) NH 3.0 Linq provider uses query parameters from first call in subsequent calls.

[Nicola T. (JIRA) <nh...@gm...>]

     [ http://216.121.112.228/browse/NH-2500?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicola Tuveri updated NH-2500:
------------------------------

    Attachment: NH-2500.patch

Attached a patch that fix the issue. The patch is generated targeting revision 5365.

Constants were compiled into the lambda used to shape the result.
In the patch constants are converted into parameters and refreshed each execution of a cached query. 
The issue is the same demonstrated in the test attached to NH-2397 by Joao Braganca.


> NH 3.0 Linq provider uses query parameters from first call in subsequent calls.
> -------------------------------------------------------------------------------
>
>                 Key: NH-2500
>                 URL: http://216.121.112.228/browse/NH-2500
>             Project:  NHibernate
>          Issue Type: Bug
>          Components: Linq Provider
>    Affects Versions: 3.0.0.GA
>            Reporter: Andrey Titov
>            Priority: Critical
>         Attachments: NH-2500.patch, NHTest3.zip
>
>
> NH 3.0 Linq provider uses query parameters from first call in subsequent calls if this parameters are not propagated to SQL.
> //in first session
> this.number = 545;
> var cats = session.Query<Cat>().Select(cat => new CatInfo { Name = cat.Name, SomeNumber = this.number }).ToList();
> // all works perfect: all CatInfos contains 545
> //later in another session
> this.number = 842;
> var cats = session.Query<Cat>().Select(cat => new CatInfo { Name = cat.Name, SomeNumber = this.number }).ToList();
> // magic happens: all CatInfos contains 545 again
> I've debugged NH and found that in second query it gets QueryPlan from cache in NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan() and it contains parameters from first call of query (NHibernate.Linq.NhLinqExpression.ParameterValuesByName) and then fails to replace them in NHibernate.Linq.NhQueryProvider.SetParameters() because they are not actual SQL parameters (query.NamedParameters).
> Sample solution is attached (VS2010, SQL Server Express DB). Put NH and LinFu.DynamicProxy binaries to .Libraries\NHibernate before build.
> I think actual parameters should be cleared from query (set to default(T)) before putting plan in QueryPlanCache to let them be garbage collected and prevent real magic happen in case of similar bugs.

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