[英]Nhibernate mapping by code: many to many
I have problems understanding proper mapping (mapping by code) for updating my data. 我在理解正确的映射(通过代码映射)以更新数据时遇到问题。 Here it is (simplified for the sake of clarity).
在这里(为清楚起见简化了)。
I can't figured it out how to properly map my classes. 我不知道如何正确映射我的班级。 No matter what kind of cascade I set I can't get nhibernate to: - NOT modify person records, - properly delete or modify records from objectperson table - it mostly just try to add new ones.
无论我设置哪种类型的层叠,我都无法使它休眠:-不修改个人记录,-从对象人表中正确删除或修改记录-它大多只是尝试添加新记录。 I suspect my mappings are completely wrong but cant figure it out.
我怀疑我的映射是完全错误的,但无法弄清楚。
I also tried to make composite key for objectperson table (makes more sense) but found out it is for some reason discouraged in nhibernate. 我还尝试为对象人表创建复合键(更合理),但由于某种原因,它在nhibernate中不建议使用。 That's why I added separate autoid column.
这就是为什么我添加了单独的autoid列。
I managed to make selecting records work (sample below) but SaveOrUpdate never works as expected... where I gone wrong? 我设法使选择记录起作用(下面的示例),但是SaveOrUpdate却无法按预期工作...我哪里出错了?
My classes: 我的课程:
t_object
{
public virtual int ID { get; set; }
public virtual string Number { get; set; }
public virtual IEnumerable<t_objectperson> Persons { get; set; }
}
t_person
{
public virtual int ID { get; set; }
public virtual string Name { get; set; }
public virtual string Surename { get; set; }
public virtual IEnumerable<t_objectperson> Objects { get; set; }
}
t_objectperson
{
public virtual int ID { get; set; }
public virtual t_object Object { get; set; }
public virtual t_person Person { get; set; }
public virtual int Status { get; set; }
public virtual DateTime Added { get; set; }
public virtual DateTime? Expired { get; set; }
}
My mappings: 我的映射:
public t_object_map()
{
this.Table("rs_object");
this.Id(c => c.ID, m =>
{
m.Column("Id");
m.Generator(Generators.Identity);
});
this.Property(c => c.Number);
Set(x => x.Persons
, c => {
c.Key(k => k.Column("IdObject"));
c.Cascade(Cascade.All);
}
, map => map.OneToMany(p => p.Class(typeof(t_objectperson)))
);
}
public t_objectperson_map()
{
this.Table("rs_objectperson");
this.Id(c => c.ID, m =>
{
m.Column("Id");
m.Generator(Generators.Identity);
});
this.Property(c => c.ID);
this.ManyToOne(p => p.Object, m =>
{
m.Column("IdObject");
m.Cascade(Cascade.All);
//m.NotNullable(true);
m.Unique(false);
});
this.ManyToOne(p => p.Person, m =>
{
m.Column("IdPerson");
//m.Cascade(Cascade.All);
//m.NotNullable(true);
m.Unique(false);
});
}
public t_person_map()
{
this.Table("rs_person");
this.Id(c => c.ID, m =>
{
m.Column("Id");
m.Generator(Generators.Identity);
});
this.Property(c => c.Name);
this.Property(c => c.Surename);
}
How I get data: 我如何获取数据:
var query = session
.QueryOver<t_object>()
.Where(c => c.ID == ID)
.Fetch(c => c.Persons).Eager
.Fetch(x => x.Persons.First().Object).Eager
.OrderBy(c => c.Number).Asc
.List<t_object>();
Are you missing the collection mapping on t_person_map? 您是否错过了t_person_map上的集合映射?
You need to set Inverse(true) Set collection. 您需要设置Inverse(true)Set集合。
Here's a quick explanation of when to set inverse: 这是何时设置逆的简要说明:
one-to-many -> many-to-one 一对多->多对一
right side should be active (left with inverse="true"), to save on UPDATEs (unless left side is explicitly ordered) 右侧应处于活动状态(左侧带有inverse =“ true”),以保存UPDATE(除非明确指定左侧)
ie one side has to take control of relationship and you need to be consistent in the way you do this. 也就是说,一方必须控制关系,并且您需要保持一致的方式。
from: http://notherdev.blogspot.com/2012/04/nhibernates-inverse-what-does-it-really.html 来自: http : //notherdev.blogspot.com/2012/04/nhibernates-inverse-what-does-it-really.html
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