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c#sqlnhibernateoledb

NHibernate OleDB: Invalid program bind when using session.get<T>(id)

I'm using NHibernate for the first time. I've set it up to use OleDB to connect to a SQLBase database. I've set up a few of my classes and now tried the first short test to see if it works.

This is my test:

[TestClass]
public class Hibernate
{
    private ISessionFactory _sessionFactory;
    private Configuration _config;

    [TestInitialize]
    public void InitTest()
    {
        _config = new Configuration();
        _config.Configure();
        _config.AddAssembly(typeof(Coil).Assembly);
        _sessionFactory = _config.BuildSessionFactory();
    }


    [TestMethod]
    public void TestMethod1()
    {
        using (var session = _sessionFactory.OpenSession())
        {
            Int32 coilid = 12189;
            Coil coil = session.Get<Coil>(coilid);
            Assert.AreEqual(coil.CoilNumber, "6FEB13");
        }
    }
}

And here's the relevant part of the mapping:

<class name="Coil" table="COIL">
<id name="ID" column="COILID" type="integer">
  <generator class="hilo">
    <param name="table">DEFTAB</param>
    <param name="column">WERT1</param>
    <param name="max_lo">10</param>
    <param name="where">TBCODE='LFDNR' AND CODE='WGID'</param>
  </generator>
</id>
<property name="CoilNumber" column="COILNR" type="string" />
</class>

When I try to run my simple test, I get an GenericADOException: could not load an entity. [SQL: SELECT ... WHERE coil0_.COILID=?] ---> System.Data.OleDb.OleDbException: Invalid program bind variable.

When I copy the SELECT ... WHERE coil0_.COILID=12189 to a SQLbase client the query succeeds without any error. The problem is that somehow NHibernate doesn't put my id variable into the query and instead simply puts a ? there.

Am I just using a wrong syntax in my test or do I have some configuration problem?

At last my hibernate config file if it helps:

  <session-factory>
<property  name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="dialect">NHibernate.Dialect.GenericDialect</property>
<property name="connection.driver_class">NHibernate.Driver.OleDbDriver</property>
<property name="connection.connection_string">Provider=SQLBASEOLEDB.1;Password=XXX;User ID=XXX;Data Source=XXX</property>
<property name="show_sql">true</property>

Again, the SQL output is fine but I don't get why NHibernate doesn't put the ID I use for the function into the SQL query.

Edit: COILID is a normal INTEGER in the database table, and a int in the Coil class.

Edit2: Here's the stack trace

System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(OleDbHResult hr)
System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult)
System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult)
System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult)
System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior)
System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader()
NHibernate.AdoNet.AbstractBatcher.ExecuteReader(IDbCommand cmd)
NHibernate.Loader.Loader.GetResultSet(IDbCommand st, Boolean autoDiscoverTypes, Boolean callable, RowSelection selection, ISessionImplementor session)
NHibernate.Loader.Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)
NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)
NHibernate.Loader.Loader.LoadEntity(ISessionImplementor session, Object id, IType identifierType, Object optionalObject, String optionalEntityName, Object optionalIdentifier, IEntityPersister persister)
NHibernate.Loader.Loader.LoadEntity(ISessionImplementor session, Object id, IType identifierType, Object optionalObject, String optionalEntityName, Object optionalIdentifier, IEntityPersister persister)
NHibernate.Loader.Entity.AbstractEntityLoader.Load(ISessionImplementor session, Object id, Object optionalObject, Object optionalId)
NHibernate.Loader.Entity.AbstractEntityLoader.Load(Object id, Object optionalObject, ISessionImplementor session)
NHibernate.Persister.Entity.AbstractEntityPersister.Load(Object id, Object optionalObject, LockMode lockMode, ISessionImplementor session)
NHibernate.Event.Default.DefaultLoadEventListener.LoadFromDatasource(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options)
NHibernate.Event.Default.DefaultLoadEventListener.DoLoad(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options)
NHibernate.Event.Default.DefaultLoadEventListener.Load(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options)
NHibernate.Event.Default.DefaultLoadEventListener.ProxyOrLoad(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options)
NHibernate.Event.Default.DefaultLoadEventListener.OnLoad(LoadEvent event, LoadType loadType)
NHibernate.Impl.SessionImpl.FireLoad(LoadEvent event, LoadType loadType)
NHibernate.Impl.SessionImpl.Get(String entityName, Object id)
NHibernate.Impl.SessionImpl.Get(Type entityClass, Object id)
NHibernate.Impl.SessionImpl.Get[T](Object id)
Tests.Hibernate.TestMethod1() in "D:\Hibernate.cs": Zeile 36

The create table syntax for the Coil table is as follows:

CREATE TABLE COIL (
  COILID INTEGER NOT NULL, 
  COILNR VARCHAR(50), 
);

Edit5: Querying all entries works, but as soon as I want to get a specific entry from the table I get the ? error again :(

var allCoils = session.CreateCriteria<Coil>().List<Coil>();
Coil datCoil = allCoils.First<Coil>(coil => coil.CoilNumber == "6FEB13");
Assert.AreEqual(datCoil.CoilNumber, "6FEB13");

This test is successful at least

Edit6: The problem seems to be that nhibernate prepares the sql like this:

DEBUG NHibernate.SQL - SELECT coil0_.COILID as COILID1_0_, coil0_.COILNR as COILNR1_0_ FROM COIL coil0_ WHERE coil0_.COILID=?;p0 = 12189

but SQLbase wants prepared strings like

WHERE coil0_.COILID = :0
\
12189
/

What would I have to do to change the way nhibernate transforms the bind variables into SQL?

Solution

  • I was able to fix this problem by writing my own driver and dialect for SQLBase (from OleDbDriver and GenericDialect respectively). I can post the code if anyone else would need it to use SQLBase with NHibernate.