Hibernate映射问题

Question

Hibernate的set映射怎么提取不到数据啊！！！！！！！！！

Answer 1

把laze="false" 试下。

Answer 2

双向一对多    
1一的一方
<?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" >
<hibernate-mapping package="com.hystu.entity">
<class name="Category" table="shop_category">
<id name="id" column="id" type="long">
<generator class="hilo">
<param name="table">hilo</param>
<param name="column">next_hi</param>
</generator>
</id>
<property name="name" column="name" type="string"/>
<set name="secondcategory" table="shop_second_category"  cascade="all" lazy="false" fetch="select">
<key>
<column name="id" />
</key>
<one-to-many class="com.hystu.entity.SecondCategory"/>
</set>
</class>
</hibernate-mapping>2多的一方
<?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" >
<hibernate-mapping package="com.hystu.entity">
<class name="SecondCategory" table="shop_second_category">
<id name="id" column="id" type="long">
<generator class="hilo">
<param name="table">hilo</param>
<param name="column">next_hi</param>
</generator>
</id>
<property name="name" column="name" type="string"/>
<many-to-one name="category" column="categoryid" class="Category" lazy="false"/>
</class>
</hibernate-mapping>