标签：基于 Hibernate void CRUD Teacher teacher teacherdao null public
一个简单的练习项目：基于Hibernate实现CRUD
共有两个表，Teacher表、College表。单向的多对一映射关系。以下是我的代码实现。
1.项目的目录结构：
2.HibernateUtil.java:
//SessionFaction单态模式
public class HibernateUtil {
private static SessionFactory sf=null;
private static Configuration cfg=null;
static {//在类加载的时候只能加载一次
try {
cfg = new Configuration().configure();
sf=cfg.buildSessionFactory();
} catch (HibernateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static SessionFactory getSessionFactory() {
return sf;
}
public static void closeSessionFactory(){
sf.close();
}
}3.Hibernate.cfg.xml:
<hibernate-configuration>
<session-factory >
<property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<property name="hibernate.connection.driver_class ">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernateTest?useSSL=false</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password"> </property>
<property name="show_sql">true</property>
<!-- 保证每个读写线程有唯一的session实例 -->
<property name="hibernate.current_session_context_class">thread</property>
<mapping resource="cn/hrbust/pojo/Teacher.hbm.xml"/>
<mapping resource="cn/hrbust/pojo/College.hbm.xml"/>
</session-factory>
</hibernate-configuration>4.Teacher.hbm.xml
<hibernate-mapping>
<class name="cn.hrbust.pojo.Teacher" table="T_Teacher" select-before-update="true" dynamic-update="true">
<id name="id" column="id">
<generator class="native"/>
</id>
<property name="name"/>
<property name="gender"/>
<property name="age"/>
<property name="course"/>
<property name="phone"/>
<many-to-one name="college" column="collegeid" class="cn.hrbust.pojo.College" cascade="save" not-null="true" />
</class>
</hibernate-mapping>5.College.hbm.xml
<hibernate-mapping>
<class name="cn.hrbust.pojo.College" table="T_College" select-before-update="true" dynamic-update="true">
<id name="id" column="id">
<generator class="native"/>
</id>
<property name="name" column="name" />
</class>
</hibernate-mapping>
6.Dao层接口
public interface TeacherDao {
void addTeacher(Teacher t);
void deleteTeacher(int id);
void updateTeacher(Teacher t,College c);
List<Teacher> queryTeacher();
}
7.Dao层的实现类
public class TeacherDaoImpl implements TeacherDao {
private SessionFactory sf = HibernateUtil.getSessionFactory();
private Session session = sf.getCurrentSession();
private Transaction ts = session.beginTransaction();
private Query query = null;
@Override
public void addTeacher(Teacher t) {
// TODO Auto-generated method stub
session.save(t);
ts.commit();
}
@Override
public void deleteTeacher(int id) {
// TODO Auto-generated method stub
Teacher teacher = session.get(Teacher.class, id);//先获得对象
session.delete(teacher);//再删除对象
ts.commit();
}
@Override
public void updateTeacher(Teacher t,College c) {
// TODO Auto-generated method stub
Teacher teacher =new Teacher();
teacher.setId(t.getId());
teacher.setName(t.getName());
teacher.setName(t.getName());
teacher.setGender(t.getGender());
teacher.setAge(t.getAge());
teacher.setCourse(t.getCourse());
teacher.setPhone(t.getPhone());
teacher.setCollege(t.getCollege());
session.update(teacher);
ts.commit();
}
@Override
public List<Teacher> queryTeacher() {
// TODO Auto-generated method stub
query = session.createQuery(" from Teacher");
List<Teacher> list = query.list();
return list;
}
}8.测试类：
public class manageTeacher extends TestCase{
public void testAdd() {
TeacherDao teacherdao = null;
Teacher teacher = null;
try {
teacherdao = new TeacherDaoImpl();
College c=new College();
c.setName("哈尔滨理工大学");
Teacher t=new Teacher();
t.setName("小美");
t.setGender("女");
t.setAge(33);
t.setCourse("工科");
t.setPhone(1234566666);
t.setCollege(c);
teacherdao.addTeacher(t);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void testDelete(){
TeacherDao teacherdao = null;
Teacher teacher = null;
try {
teacherdao = new TeacherDaoImpl();
teacherdao.deleteTeacher(14);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void testUpdate() {
TeacherDao teacherdao = null;
Teacher teacher = null;
try {
teacherdao = new TeacherDaoImpl();
College c=new College();
c.setName("哈尔滨理工大学");
Teacher t=new Teacher();
t.setId(13);
t.setName("小美老师");
t.setGender("女");
t.setAge(28);
t.setCourse("工科");
t.setPhone(88888888);
t.setCollege(c);
teacherdao.updateTeacher(t,c);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void testQuery() {
TeacherDao teacherdao = null;
Teacher teacher = null;
try {
teacherdao = new TeacherDaoImpl();
List<Teacher> teachers = teacherdao.queryTeacher();
for (int i=0;i<teachers.size();i++) {
Teacher t=(Teacher)teachers.get(i);
System.out.println(t.getName()+" —— "+t.getGender()+" —— "+t.getAge()+" —— "+t.getCourse()+" —— "+t.getPhone()+" —— "+"所属学校:"+t.getCollege().getName());
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}实验结果：
增加操作：
删除操作
删除前：
删除后：
修改操作
修改前：
修改后：
查询操作
标签：基于,Hibernate,void,CRUD,Teacher,teacher,teacherdao,null,public 来源： https://blog.csdn.net/qq_42962315/article/details/117914222
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