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时宜，请原谅我。

我正在通过代码在 Nhibernate 中映射 table，我不断收到此错误：

could not execute query

我创建了以下 classes

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));
    }        
}

我运行下面的查询

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();
    }
}

它以异常结束并显示以下消息

无法执行查询：

[ select policedata0_.id as id0_, policedata0_.policyNumber as policyNu2_0_, policedata0_.product as product0_, policedata0_.Navn as Navn0_, policedata0_.Adresse as Adresse0_, policedata0_.Husnr as Husnr0_, policedata0_.Postnr as 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 table 中有 none。

所以我确实尝试通过将其添加到 class PoliceData

在代码中创建一个 Id

virtual public int Id { get; set; }

并将其添加到 PoliceDataMap

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

现在我收到编译错误：

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

我该怎么做才能解决这个问题，NHibernate 是否需要

在映射 class 中定义的列

map.Generator(Generators.Identity));

它有什么作用？

Answer 1

任何映射的实体都必须映射 ID，因此您必须提供一些。但是如果你有这样的 ID：

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

片段如何映射 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);
});

代码错误消息的 NHibernate 映射无法执行查询

NHibernate mapping by code error message could not execute query

c#

nhibernate

nhibernate-mapping

fluent-nhibernate

nhibernate-mapping-by-code

Mapping-by-Code - Id, NaturalId