Question

症状和单词，具有多对多关系。我想要Symptom.Words和Word.Symptoms属性。我将这些部分添加到映射中：

单词映射

Set(x => x.Symptoms, s =>
{
    s.Table("SymptomWords");
    s.Key(k =>
    {
        k.Column("WordID");
    });
}, r =>
{
    r.ManyToMany(x =>
    {
        x.Column("SymptomID");
        x.Class(typeof(Symptom));
    });
});

症状映射

Set(x => x.Words, s =>
{
    s.Table("SymptomWords");
    s.Key(k =>
    {
        k.Column("SymptomID");
    });
}, r =>
{
    r.ManyToMany(x =>
    {
        x.Column("WordID");
        x.Class(typeof(Word));
    });
});

当我按new SchemaExport(cfg).SetOutputFile("p:\\schema.sql").Execute(true, false, false)导出架构时，交集表的主键出错：

create table SymptomWords (
    Id INT not null,
   SymptomID  integer primary key autoincrement,
   WordID INT,
   constraint FKD8EFCF9E46390459 foreign key (SymptomID) references Symptom,
   constraint FKD8EFCF9EA79E50D0 foreign key (WordID) references Word
);

映射有什么问题？

更新

我发现使用Bag代替Set会给出正确的sql：

create table SymptomWords (
    Id  integer primary key autoincrement,
   SymptomID INT,
   WordID INT,
   constraint FKD8EFCF9E46390459 foreign key (SymptomID) references Symptom,
   constraint FKD8EFCF9EA79E50D0 foreign key (WordID) references Word
)

如何处理，相同的单词和症状在关系的另一面不会出现两次，所以Set更适合这里？

Nhibernate：错误的主键

0 个答案: