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POMapping Error in NHibernate
 

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  1. POMapping Error in NHibernate
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    <p>I am trying to use NHibernate to connect to a Northwind database. But for some reason, I am not able to load the Entity Type. </p> <p>This is my Entity class </p> <pre><code>public class Product { public virtual Int32 ProductId { get; set; } public virtual String Desc { get; set; } } </code></pre> <p>Here is my Mapping </p> <pre><code> &lt;class name="Product" table="Products"&gt; &lt;id name="ProductId" column="ProductId" type="Int32"&gt; &lt;generator class="identity"&gt;&lt;/generator&gt; &lt;/id&gt; &lt;property name="Desc" column="ProductName" type="String" length="60"&gt; &lt;/property&gt; &lt;/class&gt; </code></pre> <p>I am getting the following error message</p> <p>could not load an entity: [OracleLinq.Product#12][SQL: SELECT product0_.ProductId as ProductId0_0_, product0_.ProductName as ProductN2_0_0_ FROM Products product0_ WHERE product0_.ProductId=?] </p> <p>Here is the stack Trace</p> <pre><code> at NHibernate.Loader.Loader.LoadEntity(ISessionImplementor session, Object id, IType identifierType, Object optionalObject, String optionalEntityName, Object optionalIdentifier, IEntityPersister persister) at NHibernate.Loader.Entity.AbstractEntityLoader.Load(ISessionImplementor session, Object id, Object optionalObject, Object optionalId) at NHibernate.Loader.Entity.AbstractEntityLoader.Load(Object id, Object optionalObject, ISessionImplementor session) at NHibernate.Persister.Entity.AbstractEntityPersister.Load(Object id, Object optionalObject, LockMode lockMode, ISessionImplementor session) at NHibernate.Event.Default.DefaultLoadEventListener.LoadFromDatasource(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options) at NHibernate.Event.Default.DefaultLoadEventListener.DoLoad(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options) at NHibernate.Event.Default.DefaultLoadEventListener.Load(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options) at NHibernate.Event.Default.DefaultLoadEventListener.OnLoad(LoadEvent event, LoadType loadType) at NHibernate.Impl.SessionImpl.FireLoad(LoadEvent event, LoadType loadType) at NHibernate.Impl.SessionImpl.ImmediateLoad(String entityName, Object id) at NHibernate.Proxy.AbstractLazyInitializer.Initialize() at NHibernate.Proxy.AbstractLazyInitializer.GetImplementation() at NHibernate.Proxy.Poco.Castle.CastleLazyInitializer.Intercept(IInvocation invocation) at Castle.DynamicProxy.AbstractInvocation.Proceed() at ProductProxy4c67cf5bf6e640ab82d8c21a90e2a62b.set_Desc(String value) at OracleLinq.Form1.Form1_Load(Object sender, EventArgs e) </code></pre> <p>Am I doing anything wrong?</p>
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    1. COIs there an inner exception inside the exception?
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    2. COUsually whenever I get this nhibernate error, I try and copy and paste the SQL (With the parameters replaced) in Sql Management studio to make sure that I didn't do something silly and misspell a column.
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