映射文件:user
<hibernate-mapping>
<class name="com.cui.beans.Event" table="event">
<id name="eid" type="integer">
<column name="eid" />
<generator class="native" />
</id>
<many-to-one name="user" class="com.cui.beans.User" fetch="select">
<column name="u_id" />
</many-to-one>
<property name="title" type="string">
<column name="title" length="40" />
</property>
<property name="content" type="string">
<column name="content" length="1000" />
</property>
<property name="eventDate" type="date">
<column name="event_date" length="0" />
</property>
</class>
</hibernate-mapping>event:
<hibernate-mapping>
<class name="com.cui.beans.Event" table="event">
<id name="eid" type="integer">
<column name="eid" />
<generator class="native" />
</id>
<many-to-one name="user" class="com.cui.beans.User" fetch="select">
<column name="u_id" />
</many-to-one>
<property name="title" type="string">
<column name="title" length="40" />
</property>
<property name="content" type="string">
<column name="content" length="1000" />
</property>
<property name="eventDate" type="date">
<column name="event_date" length="0" />
</property>
</class>
</hibernate-mapping>
<hibernate-mapping>
<class name="com.cui.beans.Event" table="event">
<id name="eid" type="integer">
<column name="eid" />
<generator class="native" />
</id>
<many-to-one name="user" class="com.cui.beans.User" fetch="select">
<column name="u_id" />
</many-to-one>
<property name="title" type="string">
<column name="title" length="40" />
</property>
<property name="content" type="string">
<column name="content" length="1000" />
</property>
<property name="eventDate" type="date">
<column name="event_date" length="0" />
</property>
</class>
</hibernate-mapping>event:
<hibernate-mapping>
<class name="com.cui.beans.Event" table="event">
<id name="eid" type="integer">
<column name="eid" />
<generator class="native" />
</id>
<many-to-one name="user" class="com.cui.beans.User" fetch="select">
<column name="u_id" />
</many-to-one>
<property name="title" type="string">
<column name="title" length="40" />
</property>
<property name="content" type="string">
<column name="content" length="1000" />
</property>
<property name="eventDate" type="date">
<column name="event_date" length="0" />
</property>
</class>
</hibernate-mapping>
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<hibernate-mapping>
<class name="com.cui.beans.User" table="user">
<id name="uid" type="integer">
<column name="uid" />
<generator class="native" />
</id>
<property name="username" type="string">
<column name="username" length="20" />
</property>
<property name="password" type="string">
<column name="password" length="20" />
</property>
<property name="age" type="integer">
<column name="age" />
</property>
<property name="email" type="string">
<column name="email" length="20" />
</property>
<set name="events" inverse="true" cascade="all">
<key>
<column name="u_id" />
</key>
<one-to-many class="com.cui.beans.Event" />
</set>
</class>
</hibernate-mapping>
User user=ud.findById(uid);
user.setEvents(events);
//加一句 就OK啦
events.setUser(user);或者将你的inverse="false" 也应该可以.
建议用第一种方法。
刚开始我没做user那块,以为是级联更新所以没做,可是不能添加uid,我又特意在user里把event添加了下;
怪了,我event.getU_id()能拿到uid啊,难道是我从表的u_id和主表uid不一样缘故吗?
两个表的字段名不需要一样也可以吧?我用测试类可以正确添加啊,到着不知道怎么了就不行了.
下面是控制台打印信息:Hibernate: select user0_.uid as uid0_, user0_.username as username0_, user0_.password as password0_, user0_.age as age0_, user0_.email as email0_ from user user0_
1
add event:1
Hibernate: insert into event (u_id, title, content, event_date) values (?, ?, ?, ?)
1
add event:1
Hibernate: select user0_.uid as uid0_0_, user0_.username as username0_0_, user0_.password as password0_0_, user0_.age as age0_0_, user0_.email as email0_0_ from user user0_ where user0_.uid=?
Hibernate: insert into event (u_id, title, content, event_date) values (?, ?, ?, ?)
当我建立映射时,自动生成的event类带有user属性,而u_id属性是我自己加的可是不行,不知道为啥...