nhibernate学习之集合组合依赖

1.学习目标
还是学习compenent的用法，上节实现了简单字段的组合，这节中将讨论两个问题：1.依赖对象有一个指向容器对象的引用。2。集合依赖
2.开发环境和必要准备
开发环境为:windows 2003,Visual studio .Net 2005,Sql server 2005 developer edition
必要准备：学习前六篇nhibernate学习系列 Nhibernate学习之起步篇-1 , Nhibernate学习起步之many-to-one篇 , Nhibernate学习之many-to-many篇 , nhibernate学习之三级联(Ternary Associations)篇 ， Nhibernate学习之性能改善1 ， nhibernate性能之二级缓存篇 , nhibernate学习之简单组合的映射
3.通过parent为依赖组合对象映射一个指向容器对象的引用
CompositeUser.cs

<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>-->publicclassCompositeUser
{
int_uid;
UserName_name;
publicintUid
{
get
{
return_uid;
}
set
{
_uid=value;
}
}

publicUserNameName
{
get
{
return_name;
}
set
{
_name=value;
}
}
}

UserName.cs

<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>-->publicclassUserName
{
privatestring_firstName;
privatestring_lastName;
CompositeUser_user;
publicstringFirstName
{
get
{
return_firstName;
}
set
{
_firstName=value;
}
}
publicstringLastName
{
get
{
return_lastName;
}
set
{
_lastName=value;
}
}
publicCompositeUserUser
{
get
{
return_user;
}
set
{
_user=value;
}
}
}

映射文件:CompositeUser.hbm.xml

<? xmlversion="1.0"encoding="utf-8" ?>
< hibernate-mapping xmlns ="urn:nhibernate-mapping-2.2" >
< class name ="NhibernateSample1.CompositeUser,NhibernateSample1" table ="CompositeUser" lazy ="false" >
< id name ="Uid" column ="Uid" unsaved-value ="0" >
< generator class ="native" />
</ id >
< component name ="Name" class ="NhibernateSample1.UserName,NhibernateSample1" >
< parent name ="User" ></ parent >
< property name ="FirstName" column ="FirstName" ></ property >
< property name ="LastName" column ="LastName" ></ property >
</ component >
</ class >
</ hibernate-mapping >

注意parent是指向容器对象的引用
加载一个CompositeUser对象，结果如图

4. 集合组合依赖
Composite.cs

<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>-->publicclassCompositeUser
{
int_uid;
UserName_name;
ISet_userNames=newHashedSet();
DateTime_birthDay=DateTime.Now;
publicintUid
{
get
{
return_uid;
}
set
{
_uid=value;
}
}
publicISetUserNames
{
get
{
return_userNames;
}
set
{
_userNames=value;
}
}
publicDateTimeBirthDay
{
get
{
return_birthDay;
}
set
{
_birthDay=value;
}
}
}

UserName.cs

<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>-->publicclassUserName
{
privatestring_firstName;
privatestring_lastName;
CompositeUser_user;
publicstringFirstName
{
get
{
return_firstName;
}
set
{
_firstName=value;
}
}
publicstringLastName
{
get
{
return_lastName;
}
set
{
_lastName=value;
}
}
publicCompositeUserUser
{
get
{
return_user;
}
set
{
_user=value;
}
}
}

映射文件CompositeUser.hbm.xml

<? xmlversion="1.0"encoding="utf-8" ?>
< hibernate-mapping xmlns ="urn:nhibernate-mapping-2.2" >
< class name ="NhibernateSample1.CompositeUser,NhibernateSample1" table ="CompositeUser" lazy ="false" >
< id name ="Uid" column ="Uid" unsaved-value ="0" >
< generator class ="native" />
</ id >
< set name ="UserNames" table ="UserNames" lazy ="true" >
< key column ="Uid" />
< composite-element class ="NhibernateSample1.UserName,NhibernateSample1" >
< property name ="FirstName" column ="FirstName" ></ property >
< property name ="LastName" column ="LastName" ></ property >
</ composite-element >
</ set >
< property name ="BirthDay" type ="DateTime" ></ property >
</ class >
</ hibernate-mapping >

注意：Composite可以包含集合也可以不包含集合，上面这样的配置就不包括集合，映射的属性可以选择为List,map,bag,idbag
运行添加一个Composite的测试代码，会在数据库中建立两个数据表 CompositeUser和UserNames
效果图