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我有3个表(多对多的关系)下面的Fluent NHibernate映射有什么问题?
- 资源{RESOURCEID,说明}
- 角色{角色ID,说明}
- 权限{RESOURCEID,角色ID}
我试图在流利的nHibernate中映射上面的表。这是我想要做的。
var aResource = session.Get<Resource>(1); // 2 Roles associated (Role 1 and 2)
var aRole = session.Get<Role>(1);
aResource.Remove(aRole); // I try to delete just 1 role from permission.
但在这里生成的SQL是(这是错误的)
Delete from Permission where ResourceId = 1
Insert into Permission (ResourceId, RoleId) values (1, 2);
代替(正道)
Delete from Permission where ResourceId = 1 and RoleId = 1
为什么NHibernate的这样的表现?映射有什么问题?我甚至尝试过使用Set而不是IList。这是完整的代码。
实体
public class Resource
{
public virtual string Description { get; set; }
public virtual int ResourceId { get; set; }
public virtual IList<Role> Roles { get; set; }
public Resource()
{
Roles = new List<Role>();
}
}
public class Role
{
public virtual string Description { get; set; }
public virtual int RoleId { get; set; }
public virtual IList<Resource> Resources { get; set; }
public Role()
{
Resources = new List<Resource>();
}
}
映射这里
// Mapping ..
public class ResourceMap : ClassMap<Resource>
{
public ResourceMap()
{
Id(x => x.ResourceId);
Map(x => x.Description);
HasManyToMany(x => x.Roles).Table("Permission");
}
}
public class RoleMap : ClassMap<Role>
{
public RoleMap()
{
Id(x => x.RoleId);
Map(x => x.Description);
HasManyToMany(x => x.Resources).Table("Permission");
}
}
计划
static void Main(string[] args)
{
var factory = CreateSessionFactory();
using (var session = factory.OpenSession())
{
using (var tran = session.BeginTransaction())
{
var aResource = session.Get<Resource>(1);
var aRole = session.Get<Role>(1);
aResource.Remove(aRole);
session.Save(a);
session.Flush();
tran.Commit();
}
}
}
private static ISessionFactory CreateSessionFactory()
{
return Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2008
.ConnectionString("server=(local);database=Store;Integrated Security=SSPI"))
.Mappings(m =>
m.FluentMappings.AddFromAssemblyOf<Program>()
.Conventions.Add<CustomForeignKeyConvention>())
.BuildSessionFactory();
}
public class CustomForeignKeyConvention : ForeignKeyConvention
{
protected override string GetKeyName(FluentNHibernate.Member property, Type type)
{
return property == null ? type.Name + "Id" : property.Name + "Id";
}
}
谢谢, 阿什拉夫。
完美。谢谢stoto。因为我使用Resource作为我的主要实体。我需要翻转许多映射。 在ResourceeMap中。 HasManyToMany(x => x.Roles).AsSet()。Cascade.SaveUpdate()。Table(“Permission”); 在RoleMap中。 HasManyToMany(x => x.Resources).AsSet()。Inverse()。Table(“Permission”); – ashraf 2010-03-26 17:15:43
也有人博客关于它。 http://www.codinginstinct.com/2010/03/nhibernate-tip-use-set-for-many-to-many.html – ashraf 2010-03-26 20:13:53