> I am posting here an issue that i observed with NHibernate. Sorry to post
> here if this is already (if so please redirect me to the same).
>
> Details of my project:
> NHibernate version used - 1.2
> Underlying database - Oracle 11g.
> .NET language - C#, .NET Framework - 3.5
>
> Issue:
>
> Code:
> Attempted to read or write protected memory. This is often an indication
> that other memory is corrupt.
Likely a problem with ODP.NET. I'm not sure which version of ODP.NET
you're using, but be sure you're using a recent build and also that you
install the proper version for your OS, so the 64bit version for your 64bit
OS or the 32bit version for the 32bit OS.
ODP.NET is a .NET wrapper around a Java based client, and the
exception occurs inside the client, not the code calling it.
FB
>
> The inner exception is:
> An exception of type 'NHibernate.ADOException' occurred in method 'DoList'
> of class 'Loader'
>
> The stack trace given is:
> at NHibernate.Loader.Loader.DoList(ISessionImplementor session,
> QueryParameters queryParameters) in C:\Documents and Settings\test
> \Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line
> 1803
> at
> NHibernate.Loader.Loader.ListIgnoreQueryCache(ISessionImplementor
> session, QueryParameters queryParameters) in C:\Documents and Settings
> \test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader
> \Loader.cs:line 1745
> at NHibernate.Loader.Loader.List(ISessionImplementor session,
> QueryParameters queryParameters, ISet querySpaces, IType[]
> resultTypes) in C:\Documents and Settings\test\Desktop
\NHibernate-1.2.1.GA-
> src\src\NHibernate\Loader\Loader.cs:line 1733
> at NHibernate.Impl.SessionImpl.Find(CriteriaImpl criteria, IList
> results) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-
> src\src\NHibernate\Impl\SessionImpl.cs:line 4963
> at NHibernate.Impl.SessionImpl.Find[T](CriteriaImpl criteria) in C:
> \Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src
> \NHibernate\Impl\SessionImpl.cs:line 4914
> at NHibernate.Impl.CriteriaImpl.List[T]() in C:\Documents and
> Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Impl
> \CriteriaImpl.cs:line 323
>
> The inner exception is:
> An exception of type 'System.AccessViolationException' occurred in method
> 'Read' of class 'OpsDac'
>
> The stack trace given is:
> at Oracle.DataAccess.Client.OpsDac.Read(IntPtr opsConCtx, IntPtr
> opsErrCtx, IntPtr opsSqlCtx, IntPtr& opsDacCtx, OpoSqlValCtx*
pOpoSqlValCtx,
> OpoMetValCtx* pOpoMetValCtx, OpoDacValCtx*
> pOpoDacValCtx)
> at Oracle.DataAccess.Client.OracleDataReader.Read()
> at NHibernate.Loader.Loader.DoQuery(ISessionImplementor session,
> QueryParameters queryParameters, Boolean returnProxies) in C:
> \Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src
> \NHibernate\Loader\Loader.cs:line 440
> at
>
NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImpl
> ementor
> session, QueryParameters queryParameters, Boolean returnProxies) in C:
> \Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src
> \NHibernate\Loader\Loader.cs:line 181
> at NHibernate.Loader.Loader.DoList(ISessionImplementor session,
> QueryParameters queryParameters) in C:\Documents and Settings\test
> \Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line
> 1793
>
>
> Code Accessing NHibernate:
> I save an object say 'OBJ1' in database using ADO.NET, and then i try to
> load it from NHibernate, but at this time i get the above reported
> exception.
>
> Below is the sample code.
>
> Code:
> public void Main()
> {
> //Placeholder for saving ID of new record that is saved through ADO.
> decimal static ADOSavedObjectID;
>
> ADONewTestRecord obj = new ADONewTestRecord();
>
> //ADO.NET code to save this returns saved object db ID.
> ADOSavedObjectID = SaveThroughADO(obj);
>
> //Fetch the Saved record through NHibernate.
> TestNewRecordFromNHibernate =
> GetTestRecordThroughNHibernate(ADOSavedObjectID)
>
> public decimal SaveThroughADO(ADONewTestRecord obj)
> {
> //ADO code.
> }
>
> public TestNewRecordFromNHibernate
> GetTestRecordThroughNHibernate(decimal ADOSavedObjectID)
> {
> return LoadNHibernateObject(ADOSavedObjectID);
> }
>
> public TestNewRecordFromNHibernate LoadNHibernateObject(decimal
> ADOSavedObjectID)
> {
> //NHibernate session is already opened, i am not providing
details.
> Session.Clear();
> IList<TestNewRecordFromNHibernate> results;
> ICriteria criteria = Session.CreateCriteria(typeof
> (TestNewRecordFromNHibernate));
> criteria.Add(Expression.Eq("ID", ADOSavedObjectID));
> //In this line i get the reported exception see above.
> results = criteria.List<TestNewRecordFromNHibernate>();
> return results[0];
> }
> }
>
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