通过代码错误消息的NHibernate映射无法执行查询

Question

我是c＃和NHibernate的新手，所以如果这个问题不合适，请原谅我。

我正在通过代码在Nhibernate中映射表我不断收到此错误：

could not execute query

我创建了以下类

class PoliceData
{     
    virtual public int policyNumber { get; set; }
    virtual public String product { get; set; }
    virtual public String Navn { get; set; }
    virtual public String Adresse { get; set; }
    virtual public String Husnr { get; set; }
    virtual public String Postnr { get; set; }
    virtual public String By { get; set; }
    virtual public String Lattitude { get; set; }
    virtual public String Longitude { get; set; }
    virtual public String Cell100M { get; set; }
    virtual public String Cell1KM { get; set; }
    virtual public String Cell10KM { get; set; }
}    
class PoliceDataMap   : ClassMapping<PoliceData>
{
    public PoliceDataMap()
    {
        Table("policeDataView");
        Lazy(true);
        Property(x => x.policyNumber, map => map.NotNullable(true));
        Property(x => x.product, map => map.NotNullable(true));
        Property(x => x.Navn, map => map.NotNullable(true));
        Property(x => x.Adresse, map => map.NotNullable(true));
        Property(x => x.Husnr, map => map.NotNullable(true));
        Property(x => x.Postnr, map => map.NotNullable(true));
        Property(x => x.By, map => map.NotNullable(true));
        Property(x => x.Lattitude, map => map.NotNullable(true));
        Property(x => x.Longitude, map => map.NotNullable(true));
        Property(x => x.Cell100M, map => map.NotNullable(true));
        Property(x => x.Cell1KM, map => map.NotNullable(true));
        Property(x => x.Cell10KM, map => map.NotNullable(true));
    }        
}

我正在运行以下查询

public DbFactory()
{
    using (ISession session = OpenSession())
    {
        IList<PoliceData> policedata = session.Query<PoliceData>().Where(p => p.policyNumber == 053126703).ToList();
        //IList<Pet> pets = query.List<Pet>();
        // Console.Out.WriteLine("pets.Count = " + pets.Count);
        // pets.ToList().ForEach(p => Console.WriteLine(p.PetName));
        // Console.Read();
    }
}

以异常方式结束，并显示以下消息

无法执行查询：

  

[选择policedata0_.id如id0_，policedata0_.policyNumber如policyNu2_0_，policedata0_.product如product0_，policedata0_.Navn如Navn0_，policedata0_.Adresse如Adresse0_，policedata0_.Husnr如Husnr0_，policedata0_.Postnr如Postnr0_，policedata0_.Bynavn as Bynavn0_，policedata0_.Lattitude as Lattitude0_，policedata0_.Longitude as Longitude0_，policedata0_.Cell100M as Cell11_0_，policedata0_.Cell1KM as Cell12_0_，policedata0_.Cell10KM as Cell13_0_ from policeDataView policedata0_ where policedata0_.policyNumber=@p0]

在我看来，NhiberNate想要一个Id列，即使表中没有。

所以我尝试通过将其添加到类PoliceData

来尝试在代码中创建Id

virtual public int Id { get; set; }

并将其添加到PoliceDataMap

Id(x => x.id, map => map.Generator(Generators.Identity));

现在我得到编译错误：

the name 'map' does not exits in the current context 

我能做些什么来解决这个问题，NHibernate是否需要通过

在地图类中定义一个列

map.Generator（Generators.Identity））;

它做什么？

Answer 1

任何映射的实体都必须映射 ID ，因此您必须提供一些。但如果您有 ID ，请执行以下操作：

virtual public int Id { get; set; }

映射应该是

//Id(x => x.id, map => map.Generator(Generators.Identity));
Id(x => x.Id, map => map.Generator(Generators.Identity));

同时检查

Mapping-by-Code - Id, NaturalId

摘录如何mapp ID ：

Id(x => x.Id, m =>
{
    m.Column("id");

    m.Generator(Generators.Native, g => g.Params(new
    {
        // generator-specific options
    }));

    m.Length(10);
    m.Type(new Int32Type());
    m.Access(Accessor.Field);
});