所在cascade，就是說我在更新一方的時候，可以根據這一方對象之間的關聯關系，去對被關聯方進行持久化，比如說Team和Student之間的1對多關系，使用cascade,可以在team方維護其持有的student集合時，自動對其新增，修改，刪除的student對象進行持久化，而沒必要顯示的進行session.save(student)操作，cascade="delete"的意思就是說，我在session.delete(team)的時候，可以一并刪除其所有的student
數據庫腳本：
?
create
?
table
?student(id?
varchar
(
32
)?
primary
?
key
,
?????????????????????team_id?
varchar
(
32
),
?????????????????????name?
varchar
(
32
),
?????????????????????cardid?
varchar
(
32
),
?????????????????????age?
int
);
create
?
table
?team(id?
varchar
(
32
)?
primary
?
key
,
??????????????????team_id?
varchar
(
32
),
??????????????????teamname?
varchar
(
32
));
?????????????????????????
insert
?
into
?team?
values
("
1
","
1
","team1");
insert
?
into
?student?
values
("
1
","
1
","stu1","
20070101
",
22
);
insert
?
into
?student?
values
("
2
","
1
","stu2","
20070102
",
23
);
?
持久化JavaBean
?
package
?Cascade.saveUpdate;
public
?
class
?Student?
{
??
private
?String?id;
??
private
?String?cardid;
??
private
?String?name;
??
private
?
int
?age;
??
private
?Team?team;
public
?String?getId()?
{
????
return
?id;
}
public
?
void
?setId(String?id)?
{
????
this
.id?
=
?id;
}
public
?String?getCardid()?
{
????
return
?cardid;
}
public
?
void
?setCardid(String?cardid)?
{
????
this
.cardid?
=
?cardid;
}
public
?String?getName()?
{
????
return
?name;
}
public
?
void
?setName(String?name)?
{
????
this
.name?
=
?name;
}
public
?
int
?getAge()?
{
????
return
?age;
}
public
?
void
?setAge(
int
?age)?
{
????
this
.age?
=
?age;
}
public
?Team?getTeam()?
{
????
return
?team;
}
public
?
void
?setTeam(Team?team)?
{
????
this
.team?
=
?team;
}
}
package
?Cascade.saveUpdate;
import
?java.util.HashSet;
import
?java.util.Set;
public
?
class
?Team?
{
???
private
?String?id;
???
private
?Set?students
=
new
?HashSet();
???
private
?String?teamName;
public
?String?getId()?
{
????
return
?id;
}
public
?
void
?setId(String?id)?
{
????
this
.id?
=
?id;
}
public
?Set?getStudents()?
{
????
return
?students;
}
public
?
void
?setStudents(Set?students)?
{
????
this
.students?
=
?students;
}
public
?String?getTeamName()?
{
????
return
?teamName;
}
public
?
void
?setTeamName(String?teamName)?
{
????
this
.teamName?
=
?teamName;
}
}
?
Hibernate.cfg.xml
?
<?
xml?version='1.0'?encoding='UTF-8'
?>
<!
DOCTYPE?hibernate-configuration?PUBLIC
??????????"-//Hibernate/Hibernate?Configuration?DTD?3.0//EN"
??????????"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"
>
<!--
?Generated?by?MyEclipse?Hibernate?Tools.???????????????????
-->
<
hibernate-configuration
>
<
session-factory
>
????
<
property?
name
="connection.username"
>
root
</
property
>
????
<
property?
name
="connection.url"
>
????????jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312
&
useUnicode=true
????
</
property
>
????
<
property?
name
="dialect"
>
????????org.hibernate.dialect.MySQLDialect
????
</
property
>
????
<
property?
name
="myeclipse.connection.profile"
>
mysql
</
property
>
????
<
property?
name
="connection.password"
>
1234
</
property
>
????
<
property?
name
="connection.driver_class"
>
????????com.mysql.jdbc.Driver
????
</
property
>
????
<
property?
name
="hibernate.dialect"
>
????????org.hibernate.dialect.MySQLDialect
????
</
property
>
????
<
property?
name
="hibernate.show_sql"
>
true
</
property
>
????
<
property?
name
="current_session_context_class"
>
thread
</
property
>
????
<
property?
name
="jdbc.batch_size"
>
15
</
property
>
????
<
mapping?
resource
="Cascade/delete/Student.hbm.xml"
?
/>
????
<
mapping?
resource
="Cascade/delete/Team.hbm.xml"
?
/>
</
session-factory
>
</
hibernate-configuration
>
?
Student.hbm.xml
?
<?
xml?version="1.0"?encoding="utf-8"
?>
<!
DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"
>
<!--
?
????Mapping?file?autogenerated?by?MyEclipse?-?Hibernate?Tools
-->
<
hibernate-mapping
>
<
class?
name
="Cascade.delete.Student"
?table
="student"
>
??
<
id?
name
="id"
?unsaved-value
="null"
>
????
<
generator?
class
="uuid.hex"
></
generator
>
??
</
id
>
??
<
property?
name
="cardid"
?type
="string"
/>
??
<
property?
name
="name"
?type
="string"
/>
??
<
property?
name
="age"
?type
="int"
/>
??
<
many-to-one?
name
="team"
?
???????????????column
="team_id"
???????????????class
="Cascade.delete.Team"
???????????????lazy
="no-proxy"
>
??
</
many-to-one
>
</
class
>
</
hibernate-mapping
>
?
Team.hbm.xml
?
<?
xml?version="1.0"?encoding="utf-8"
?>
<!
DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"
>
<!--
?
????Mapping?file?autogenerated?by?MyEclipse?-?Hibernate?Tools
-->
<
hibernate-mapping
>
<
class?
name
="Cascade.delete.Team"
?table
="team"
?lazy
="true"
>
???????
<
id?
name
="id"
?column
="id"
>
?????????
<
generator?
class
="uuid.hex"
></
generator
>
???????
</
id
>
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