NHibernate一对多生成插入和更新
嗨,我有一个包含文档一对多映射的请求类 请求类NHibernate一对多生成插入和更新,nhibernate,one-to-many,insert-update,Nhibernate,One To Many,Insert Update,嗨,我有一个包含文档一对多映射的请求类 请求类 public class Request { virtual public int Id { get; set; } ... virtual public Iesi.Collections.Generic.ISet<Document> Documents { get; set; } } XML映射如下所示: 请求 及 我不明白为什么NHibernate
public class Request
{
virtual public int Id
{
get;
set;
}
...
virtual public Iesi.Collections.Generic.ISet<Document> Documents
{
get;
set;
}
}
XML映射如下所示:
请求
及
我不明白为什么NHibernate的更新字段已经有了正确的值,却生成了INSERT和UPDATE
我也找到了这个帖子
这是建议使用inverse,但当我将其添加到映射时,ParentEntityId将被0填充
谢谢将文档类更改为引用请求类而不是ParentEntityId
public class Document
{
public virtual int Id
{
get;
set;
}
public virtual Request ParentEntity
{
get;
set;
}
}
在尝试插入新请求时不会发出额外更新语句的文档上设置inverse=true
<set name="Documents" cascade="all-delete-orphan" **inverse="true"**>
<key column="doc_parent_ent_id" not-null="true"/>
<one-to-many class="xxxx.Domain.Document"/>
</set>
通过使inverse=false
(默认情况下,不需要设置ParentEntity属性),NHibernate将自动检测该关系。但它附带了额外的update语句,我们在这里试图避免它
最后,在文档映射中包含多对一关系
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="xxxx"
namespace="xxxx.Domain">
<class name="Document" table="tbl_doc">
<id name="Id" column="doc_id">
<generator class="native"></generator>
</id>
**<many-to-one cascade="none" class="xxx.Request" name="ParentEntity">
<column name="doc_parent_ent_id" not-null="true" />
</many-to-one>**
</class>
</hibernate-mapping>
**
**
谢谢。你的解决方案有效。我没有意识到相反的含义。
INSERT INTO tbl_doc (doc_digimage_code, doc_lnk_filename, doc_lnk_filepath, doc_timestamp, doc_author, doc_parent_ent_id) VALUES (@p0, @p1, @p2, @p3, @p4, @p5); select SCOPE_IDENTITY()',N'@p0 nvarchar(4000),@p1 nvarchar(4000),@p2 nvarchar(4000),@p3 datetime,@p4 int,@p5 int',@p0=N'1',@p1=NULL,@p2=NULL,@p3='2013-02-28 18:05:45',@p4=7353,@p5=174
UPDATE tbl_doc SET doc_parent_ent_id = @p0 WHERE doc_id = @p1',N'@p0 int,@p1 int',@p0=174,@p1=32
public class Document
{
public virtual int Id
{
get;
set;
}
public virtual Request ParentEntity
{
get;
set;
}
}
<set name="Documents" cascade="all-delete-orphan" **inverse="true"**>
<key column="doc_parent_ent_id" not-null="true"/>
<one-to-many class="xxxx.Domain.Document"/>
</set>
Request objRequest = new Request();
objRequest.Documents = new Iesi.Collections.Generic.ISet<Document>()
{
new Document() { Id = 1, ParentEntity = objRequest }
};
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="xxxx"
namespace="xxxx.Domain">
<class name="Document" table="tbl_doc">
<id name="Id" column="doc_id">
<generator class="native"></generator>
</id>
**<many-to-one cascade="none" class="xxx.Request" name="ParentEntity">
<column name="doc_parent_ent_id" not-null="true" />
</many-to-one>**
</class>
</hibernate-mapping>