NHibernate

Question

我在保存具有关联的实体时遇到问题。下面是我的代码，它给出了错误

Fluent Class 继承自 Fluent Migration

 public override void Up()  //Update your changes to the database
 {
Create.Table("assinatura")
.WithColumn("id").AsInt32().Identity().PrimaryKey()
.WithColumn("usuario_id").AsInt32()
.WithColumn("isfreeplan").AsInt32()  //1 sim   0 nao
.WithColumn("gratuito_datafinal").AsDateTime()


Create.Table("usuarios")
.WithColumn("id").AsInt32().Identity().PrimaryKey()
.WithColumn("nomecompleto").AsString(256)     //Patricia dos Santos
.WithColumn("email").AsString(512)           //patricia@gmail.com
.WithColumn("password").AsString(128)        //123123123

Create.ForeignKey("IX_FK_AssinaturasUsuarios")
.FromTable("assinatura").ForeignColumn("usuario_id")
.ToTable("usuarios").PrimaryColumn("id");
}

Table"Usuario"

的映射

  public class UsuariosMap : ClassMapping<Usuario>
    {


  public enum Niveis { CADASTRADO = 0, REQUISITOU_PAGAMENTO = 1 }
        public virtual int id { get; set; }
        public virtual string nomecompleto { get; set; }
        public virtual string email { get; set; }
        public virtual string password { get; set; }

        public UsuariosMap()
        {
            Table("usuarios");
            Id(x => x.id, x => x.Generator(Generators.Identity));
            Property(x => x.nomecompleto, x => x.NotNullable(true));
            Property(x => x.email, x => x.NotNullable(true));
            Property(x => x.password, x => x.NotNullable(true));
            Bag(x => x.assinaturas, map => {
                map.Table("assinatura");
                map.Lazy(CollectionLazy.Lazy);
                map.Inverse(true);
                map.Key(k => k.Column(col => col.Name("usuario_id")));
                map.Cascade(Cascade.All); //set cascade strategy
            }, rel => rel.OneToMany());

        }

Table"Assinatura"

的映射

 public class Assinatura
    {
        public virtual int Id { get; set; }

        public virtual int usuario_id { get; set; }

        public virtual int isfreeplan { get; set; }
        public virtual DateTime gratuito_datafinal { get; set; }
        public virtual Usuario usuario { get; set; }

    }
   public class AssinaturaMap : ClassMapping<Assinatura>
    {
        public AssinaturaMap()
        {
            Table("assinatura");
            Id(x => x.Id, x => x.Generator(Generators.Identity));
            Property(x => x.usuario_id, x => x.NotNullable(true));
            Property(x => x.isfreeplan, x => x.NotNullable(true));
            Property(x => x.gratuito_datafinal, x => x.NotNullable(true));

            ManyToOne(x => x.usuario, x=>
            {
                x.Cascade(Cascade.DeleteOrphans);
                x.Column("usuario_id");
                x.ForeignKey("IX_FK_AssinaturasUsuarios");
            });
        }
    }

当我尝试更新用户 "Usuario" 添加新用户时 "Assinatura" 我收到错误消息

 var user = Database.Session.Load<Usuario>(1);
            var ass = new Assinatura
            {
                isfreeplan = 0,
                gratuito_datafinal = DateTime.Now,
                usuario = user
            };

            if (user != null)
            {
                user.assinaturas.Add(ass);
                Database.Session.SaveOrUpdate(user);
            }

An exception of type 'NHibernate.PropertyValueException' occurred in NHibernate.dll but was not handled in user code {"Error dehydrating property value for Test.Models.Assinatura.usuario"} Inner Exc: {"Parameter index is out of range."} Property Name: usuario

我只想在 Usuario table 和 Assinature table 之间建立一个基本的一对多关系（1 个用户有一个或多个 assinaturas）。

Answer 1

异常：

Parameter index is out of range

告诉我们，我们正在对一个数据库列进行两次处理。那是因为这个双重映射：

    Property(x => x.usuario_id, x => x.NotNullable(true));

    ManyToOne(x => x.usuario, x=>
    {
        x.Cascade(Cascade.DeleteOrphans);
        x.Column("usuario_id");
        ...

可以将一列用于更多属性（一种值类型，一种引用）..但仅用于读取（从数据库加载值）

对于插入/更新...我们只能使用其中之一。并且总是最好保留 read/write 参考，并且属性只读

    Property(x => x.usuario_id, x => {
        x.NotNullable(true)
        x.Insert(false)
        x.Update(false)
    })

NHibernate - 脱水属性值时出错 - 更新实体

NHibernate - Error dehydrating property value - updating entity

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NHibernate - 脱水 属性 值时出错 - 更新实体

NHibernate - Error dehydrating property value - updating entity

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nhibernate

NHibernate - 脱水属性值时出错 - 更新实体