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hsr555
 Post subject: Error on param id when loading an object
PostPosted: Fri Sep 30, 2005 6:36 am 
Newbie

Joined: Wed Sep 28, 2005 3:44 pm
Posts: 5
I am newbie to nHibernate.

I need to update info via this object . I am getting error "identifier type mismatch Parameter name: id " on the page load.

Code:
int id = Convert.ToInt32(Request.QueryString["id"]);
Configuration cfg = new Configuration();
cfg.AddAssembly("Domain");
ISessionFactory factory = cfg.BuildSessionFactory();
ISession session = factory.OpenSession();
Coupon objCoupon = null;
objCoupon = (Coupon)session.Load(typeof(Coupon),id);  <--- the error
txtCouponTitle.Text = objCoupon.CouponTitle;
imgCoupon.ImageUrl = "uploadimages\\" + objCoupon.CouponImage;
session.Close();


Stack trace:
Code:
[ArgumentException: identifier type mismatch
Parameter name: id]
   NHibernate.Engine.Key..ctor(Object id, IType identifierType, Object identifierSpace, Type clazz, Boolean isBatchLoadable) +188
   NHibernate.Impl.SessionImpl.DoLoad(Type theClass, Object id, Object optionalObject, LockMode lockMode, Boolean checkDeleted) +231
   NHibernate.Impl.SessionImpl.DoLoadByClass(Type clazz, Object id, Boolean checkDeleted, Boolean allowProxyCreation) +185
   NHibernate.Impl.SessionImpl.Load(Type clazz, Object id) +37
   WebUI.EditCoupon.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\webui\editcoupon.aspx.cs:52
   System.Web.UI.Control.OnLoad(EventArgs e) +67
   System.Web.UI.Control.LoadRecursive() +35
   System.Web.UI.Page.ProcessRequestMain() +731


HBM.XML File:
Code:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
   <!-- generated using NHibernate.hbm.cst, see http://www.intesoft.net/nhibernate for notes and latest version -->
   <class name="Domain.Coupon, Domain" table="Coupon">
      <id name="Id" type="Decimal" unsaved-value="0">
         <column name="CouponID" sql-type="Int32" not-null="true" unique="true" index="PK_SGCoupon"/>
         <generator class="native" />
      </id>
      <property name="CouponTitle" type="String">
         <column name="CouponTitle" length="250" sql-type="varchar" not-null="false"/>
      </property>
      <property name="CouponImage" type="String">
         <column name="CouponImage" length="250" sql-type="varchar" not-null="false"/>
      </property>
      <property name="CouponType" type="Byte">
         <column name="CouponType" sql-type="tinyint" not-null="false"/>
      </property>
      <many-to-one name="Store" class="Domain.Store, Domain">
         <column name="StoreId" sql-type="numeric" not-null="false"/>
      </many-to-one>
   </class>
</hibernate-mapping>


Any solution to this? Am I going somewhere wrong with the Session.Load()?
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sergey
 Post subject:
PostPosted: Fri Sep 30, 2005 6:47 am 
Contributor
Contributor

Joined: Wed May 11, 2005 4:59 pm
Posts: 1766
Location: Prague, Czech Republic
Id is mapped as a Decimal, but you are passing Int32 to Load. That's the problem.
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hsr555
 Post subject:
PostPosted: Fri Sep 30, 2005 7:32 am 
Newbie

Joined: Wed Sep 28, 2005 3:44 pm
Posts: 5
I changed it to
Decimal id = Convert.ToInt32(Request.QueryString["id"]);
....
...
objCoupon = (Coupon)session.Load(typeof(Coupon),id);

and Now I am recieving this error "identifier type mismatch Parameter name: id "

??
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hsr555
 Post subject:
PostPosted: Fri Sep 30, 2005 7:36 am 
Newbie

Joined: Wed Sep 28, 2005 3:44 pm
Posts: 5
Herez the exact code

Code:
Decimal id = Convert.ToDecimal(Request.QueryString["id"]);
Configuration cfg = new Configuration();
cfg.AddAssembly("Domain");
ISessionFactory factory = cfg.BuildSessionFactory();
ISession session = factory.OpenSession();
Coupon objCoupon = (Coupon)session.Load(typeof(Coupon),id);
session.Close();


Code:
Error : identifier type mismatch Parameter name: id

Stack Trace :
[ArgumentException: identifier type mismatch
Parameter name: id]
   NHibernate.Engine.Key..ctor(Object id, IType identifierType, Object identifierSpace, Type clazz, Boolean isBatchLoadable) +188
   NHibernate.Impl.SessionImpl.DoLoad(Type theClass, Object id, Object optionalObject, LockMode lockMode, Boolean checkDeleted) +231
   NHibernate.Impl.SessionImpl.DoLoadByClass(Type clazz, Object id, Boolean checkDeleted, Boolean allowProxyCreation) +185
   NHibernate.Impl.SessionImpl.Load(Type clazz, Object id) +37
   WebUI.EditCoupon.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\webui\editcoupon.aspx.cs:51
   System.Web.UI.Control.OnLoad(EventArgs e) +67
   System.Web.UI.Control.LoadRecursive() +35
   System.Web.UI.Page.ProcessRequestMain() +731
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hsr555
 Post subject:
PostPosted: Fri Sep 30, 2005 7:48 am 
Newbie

Joined: Wed Sep 28, 2005 3:44 pm
Posts: 5
The HBM file was not properly configured. I didnt realize that the field was numeric instead of integer.

Thanks for the tip, anyways :)
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