AssertionFailure：“空标识符” - FluentNH + SQLServerCE [英] AssertionFailure: "null identifier" - FluentNH + SQLServerCE

问题描述

代码在

  session.Save（employee）;  

上失败，并带有AssertionFailurenull identifier。我在做什么错？

 使用FluentNHibernate.Cfg; 
使用FluentNHibernate.Cfg.Db; 
使用FluentNHibernate.Mapping; 
使用NHibernate; 
使用NHibernate.Cfg; 
使用NHibernate.Tool.hbm2ddl; 
 
 namespace FNHTest 
 {
 public class Employee 
 {
 public virtual int Id 
 {
 get; 
私人设置; 
} 
 
公共虚拟字符串名称
 {
 get; 
 set; 
} 
 
公共虚拟字符串姓
 {
 get; 
 set; 
 
 
 $ b public class EmployeeMap：ClassMap 
 {
 public EmployeeMap（）
 {
 Id（e => e.Id）; 
地图（e => e.Name）; 
地图（e => e.Surname）; 
 
 
 
 public class DB 
 {
 private static ISessionFactory mySessionFactory = null; 
 
 private static ISessionFactory SessionFactory 
 {
 get 
 {
 if（mySessionFactory == null）
 {
 mySessionFactory =流利.Configure（）
 .Database（MsSqlCeConfiguration.Standard 
 .ConnectionString（Data Source = MyDB.sdf））
 .Mappings（m => m.FluentMappings.AddFromAssemblyOf（））
 .ExposeConfiguration（BuildSchema）
 .BuildSessionFactory（）; 
} 
返回mySessionFactory; 
 
 
 $ b $ private static void BuildSchema（Configuration configuration）
 {
 SchemaExport schemaExport = new SchemaExport（configuration）; 
 schemaExport.Execute（false，true，false）; 
 
 $ b $ public static ISession OpenSession（）
 {
 return SessionFactory.OpenSession（）; 
 
 
 
 public class Program 
 {
 public static void Main（string [] args）
 {
 var employee = new Employee 
 {
 Name =John，
 Surname =Smith
}; 
 
 using（ISession session = DB.OpenSession（））
 {
 session.Save（employee）; 
 
 
 
 
 $ b $ div class =h2_lin>解决方案在使用NHibernate和SQL CE标识列时有一个bug。有两个解决方法，我知道：
 $ b $ 1设置 connection.release_mode 属性为 on_close 在配置中： 
 
 
  mySessionFactory =流利的.Configure（）
 .Database （MsSqlCeConfiguration.Standard 
 .ConnectionString（Data Source = MyDB.sdf））
 .Mappings（m => m.FluentMappings.AddFromAssemblyOf（））
 .ExposeConfiguration（BuildSchema）
 .ExposeConfiguration（x => x.SetProperty（connection.release_mode，on_close））
 .BuildSessionFactory（）; 
  
 2  - 在事务中执行插入：
 
 <使用（ISession session = DB.OpenSession（））
 using（ITransaction txn = session.BeginTransaction（））
 {
 session.Save（pre $）雇员）; 
 txn.Commit（）; 
} 
  

我意识到这个问题已经超过一个月了，但我希望这个答案是仍然对你有用。

The code fails at

session.Save(employee);

with AssertionFailure "null identifier". What am I doing wrong?

using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using FluentNHibernate.Mapping;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;

namespace FNHTest
{
    public class Employee
    {
        public virtual int Id
        {
            get;
            private set;
        }

        public virtual string Name
        {
            get;
            set;
        }

        public virtual string Surname
        {
            get;
            set;
        }
    }

    public class EmployeeMap : ClassMap
    {
        public EmployeeMap()
        {
            Id(e => e.Id);
            Map(e => e.Name);
            Map(e => e.Surname);
        }
    }

    public class DB
    {
        private static ISessionFactory mySessionFactory = null;

        private static ISessionFactory SessionFactory
        {
            get
            {
                if (mySessionFactory == null)
                {
                    mySessionFactory = Fluently.Configure()
                        .Database(MsSqlCeConfiguration.Standard
                                    .ConnectionString("Data Source=MyDB.sdf"))
                        .Mappings(m => m.FluentMappings.AddFromAssemblyOf())
                        .ExposeConfiguration(BuildSchema)
                        .BuildSessionFactory();
                }
                return mySessionFactory;
            }
        }

        private static void BuildSchema(Configuration configuration)
        {
            SchemaExport schemaExport = new SchemaExport(configuration);
            schemaExport.Execute(false, true, false);
        }

        public static ISession OpenSession()
        {
            return SessionFactory.OpenSession();
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            var employee = new Employee
            {
                Name = "John",
                Surname = "Smith"
            };

            using (ISession session = DB.OpenSession())
            {
                session.Save(employee);
            }
        }
    }
}

解决方案

There's a "bug" when using NHibernate with SQL CE identity columns. There are two workarounds that I know of:

1 - Set the connection.release_mode property to on_close in configuration:

mySessionFactory = Fluently.Configure()
    .Database(MsSqlCeConfiguration.Standard
    .ConnectionString("Data Source=MyDB.sdf"))
    .Mappings(m => m.FluentMappings.AddFromAssemblyOf())
    .ExposeConfiguration(BuildSchema)
    .ExposeConfiguration(x => x.SetProperty("connection.release_mode", "on_close"))
    .BuildSessionFactory();

2 - Perform inserts in a transaction:

    using (ISession session = DB.OpenSession())
    using (ITransaction txn = session.BeginTransaction())
    {
        session.Save(employee);
        txn.Commit();
    }

I realize the question is more than a month old but I hope this answer is still of use to you.

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