Question

I try to use this tutorial: Hello NHibernate

This is my config NHibernate file:

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="hibernate-configuration" requirePermission="false" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate"/>
  </configSections>
  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <reflection-optimizer use="false"/>
    <session-factory>
      <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
      <property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
      <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
      <property name="connection.connection_string">Data Source=.\SQLEXPRESS; Initial Catalog=dbTest; Trusted_Connection=true;</property>
      <property name="proxyfactory.factory_class">NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property>
      <property name="show_sql">true</property>
      <mapping resource="TestNHibernate.user.hbm.xml" assembly="TestNHibernate"/>
    </session-factory>
  </hibernate-configuration></configuration>

This is my mapping file:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                           assembly="TestNHibernate"
                           namespace="TestNHibernate">
  <class name="user" table="user">
    <id name="Id">
      <generator class="identity"/>
    </id>
    <property name="Name"  />
  </class>
</hibernate-mapping>

Class user:

 class user
    {

        public virtual int Id { get;set; }
        public virtual string Name { get; set; }
    }

and here is query code:

 Configuration config = new Configuration();
                config.AddAssembly(typeof(user).Assembly);
                ISessionFactory sessionFactory = config.BuildSessionFactory();

                using (var session = sessionFactory.OpenSession())
                {                   
                    IQuery query = session.CreateQuery("from user as u");
                    IList<user> lst = query.List<user>();
                    foreach (var user in lst)
                    {
                        Console.WriteLine(user.Name);
                    }
                }

It’s always show error:

could not execute query [ select
user0_.Id as Id0_, user0_.Name as
Name0_ from user user0_ ] [SQL: select
user0_.Id as Id0_, user0_.Name as
Name0_ from user user0_]

I tried to insert, update but it’s also show could not insert, update. Where is my problem?

Is there my mapping file?
Please give me advice! Thanks!

Answer 1

Two things:

(1) In your mapping file, you should be enclosing the User table in square brackets, e.g. [User]. User is a reserved keyword in SQL Server (and most other SQL systems).

<class name="user" table="[user]">

(2) Whenever you get an exception in NHibernate, go into debug mode and look at the inner exceptions. Those usually provide hints as to what the problem is.