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Fluent nhibernate 断言失败:“;空标识符";-FluentNH+;SQLServerCE_Fluent Nhibernate_Sql Server Ce - Fatal编程技术网

Fluent nhibernate 断言失败:“;空标识符";-FluentNH+;SQLServerCE

Fluent nhibernate 断言失败:“;空标识符";-FluentNH+;SQLServerCE,fluent-nhibernate,sql-server-ce,Fluent Nhibernate,Sql Server Ce,代码在处失败,断言失败为“空标识符”。我做错了什么 session.Save(employee); using FluentNHibernate.Cfg; using FluentNHibernate.Cfg.Db; using FluentNHibernate.Mapping; using NHibernate; using NHibernate.Cfg; using NHibernate.Tool.hbm2ddl; namespace FNHTest { public class

代码在处失败,断言失败为“空标识符”。我做错了什么

session.Save(employee);
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);
            }
        }
    }
}
将NHibernate与SQL CE标识列一起使用时存在一个“bug”。我知道有两种变通方法:

1-设置
连接。在配置中,在关闭时将\u mode
属性释放为

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-在事务中执行插入:

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

我知道这个问题已经问了一个多月了,但我希望这个答案对你仍然有用。

仍然是正确的。即使第一次调用SELECT@@IDENTITY也会返回corect值,但第二次调用返回null

我用

*connection.driver\u class=NHibernate.driver.SqlServerCeDriver 方言:NHibernate.dial.MsSqlCeDialect*

添加属性后 *connection.release\u模式:打开\u关闭*
对于我的NHIbernate配置,它工作起来

只是出于兴趣-解决方案是什么,选项1或2(或其他)?:-)我也有同样的问题。当我使用选项1时,insert非常有效,但update根本不起作用。当我使用选项2时,insert和update都会按预期工作,但执行时间要慢2倍。无论如何,在使用NHibernate时,最好总是将所有数据库交互包装在一个事务中。所以我只会推荐选项2。只是出于兴趣-解决方案是什么,选项1或2(或其他)?:-)