nhibernate - NH 3.3 Composite-ID 通过代码映射

Question

我在这里拉我的头发试图弄清楚如何映射下面列出的 UsersRoles 表。我不好看秃头所以请帮忙:)

//这里是实体

public class UsersRole
{
    public UsersRole() { }
    public virtual User User { get; set; }
    public virtual Role Role { get; set; }
    public virtual System.Guid UserId { get; set; }
    public virtual System.Guid RoleId { get; set; }


}

//这是到目前为止的映射

public class UsersRoleMap : ClassMapping<UsersRole>
{
    public UsersRoleMap()
    {
        Table("UsersRoles");
        Lazy(true);

       // ComponentAsId(); How does this work??


        Property(x => x.UserId, map => map.Column(c =>
            {
                c.Name("UserId");
                c.NotNullable(true);
                c.Length(30);
                c.SqlType("uniqueidentifier");
            }));
        Property(x => x.RoleId, map => map.Column(c =>
            {
                c.Name("RoleId");
                c.NotNullable(true);
                c.Length(30);
                c.SqlType("uniqueidentifier");
            }));
    }
}

请参阅 ComponentAsId 映射中的注释

提前致谢，如果有人能让我走上正轨

Answer 1

您正在寻找的方法称为 ComposedId :

public class UsersRoleMap : ClassMapping<UsersRole>
{
    public UsersRoleMap()
    {
        ComposedId(map => 
        {
            map.Property(x => x.UserId);
            map.Property(x => x.RoleId);
        });
    }
}

回答你的问题 ComponentAsId作品。你应该有以下类来使用 ComponentAsId方法

public class UsersRoleId
{
    public System.Guid UserId { get; set; }
    public System.Guid RoleId { get; set; }
}

public class UsersRole
{
    public virtual User User { get; set; }
    public virtual Role Role { get; set; }
    public virtual UsersRoleId Id { get; set; }
}

现在您可以将 UsersRole.Id 映射为 ComponentAsId

public class UsersRoleMap : ClassMapping<UsersRole>
{
    public UsersRoleMap()
    {
        ComponentAsId(x => x.Id);
    }
}

PS:为什么需要映射 UsersRoles table ？我建议您将用户映射到多对多关系的角色。

public class UsersMap : ClassMapping<User>
{
    public UsersMap()
    {
        Set(x => x.Roles, x => { }, x => x.ManyToMany());
    }
}

public class RolesMap : ClassMapping<Role>
{
    public RolesMap()
    {
        Set(x => x.Users, x => { }, x => x.ManyToMany());
    }
}