想通过学生查找班级
学生能查到 班级就是查不到
public List selectallstudent() {
List<Student> list=getHibernateTemplate().find("from Student ");
return list;
}
取值
<s:if test="#request.list!=null">
<s:iterator value="#request.list" var="req">
${StuId}
${StuName}
${classes.ClassName}
</s:iterator>
</s:if>
private int StuId;
private String StuName;
//private int ClassId;
private Classes classes;
public int getStuId() {
return StuId;
}
public void setStuId(int stuId) {
StuId = stuId;
}
public String getStuName() {
return StuName;
}
public void setStuName(String stuName) {
StuName = stuName;
}
public Classes getClasses() {
return classes;
}
public void setClasses(Classes classes) {
this.classes = classes;
}
public Student(int stuId, String stuName, Classes classes) {
StuId = stuId;
StuName = stuName;
this.classes = classes;
}
public Student() {
super();
// TODO Auto-generated constructor stub
}
学生类
班级类
private int ClassId;
private String ClassName;
public int getClassId() {
return ClassId;
}
public void setClassId(int classId) {
ClassId = classId;
}
public String getClassName() {
return ClassName;
}
public void setClassName(String className) {
ClassName = className;
}
public Classes(int classId, String className) {
ClassId = classId;
ClassName = className;
}
public Classes() {
super();
// TODO Auto-generated constructor stub
}
学生的hbm.xml文件
<?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>
<class name="vo.Student" table="student">
<id name="StuId" column="StuId">
<generator class="increment">
</generator>
</id>
<property name="StuName" column="StuName" ></property>
<many-to-one name="classes" class="vo.Classes" column="ClassId"
fetch="select" cascade="all" lazy="false">
</many-to-one>
</class>
<class name="vo.Classes" table="classes">
<id name="ClassId" column="ClassId">
<generator class="increment"></generator>
</id>
<property name="ClassName" column="ClassName"></property>
</class>
</hibernate-mapping>
------解决思路----------------------
到前台时hibernate中的session已经关闭了，你就算把懒加载（lazy="false"）设为false,因此你在前台不可使用，不过可以在后台可以使用（在一个事务内）（我看的hibernate视频上说的，好像你要解决这个问题需要配置web.xml和其他的，具体的我忘了，你google吧）