标签：cti www stand create poj inf 需要 nat ble
这篇文章主要讲解：
1>.对Hibernate使用的一些简单封装；
· 2>.在单元测试中，使用Hibernate的封装的工具进行增删改查的测试
1.目录结构展示
2.代码展示
2.0 配置文件 hibernate.cfg.xml
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- 数据库连接信息 --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 默认 localhost:3306 --> <property name="connection.url">jdbc:mysql:///test</property> <property name="connection.username">root</property> <property name="connection.password">root</property> <!-- 通用配置 --> <!-- 方言：hibernate要支持多种数据库，根据不同数据库生成对应的sql语句 告诉hibernate使用的什么数据库，以便生成对应数据库的sql --> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <!-- 打印sql语句 --> <property name="show_sql">true</property> <!-- 格式化sql --> <property name="format_sql">true</property> <!-- 映射信息 注意映射文件存放的是文档路径 需要用/ --> <mapping resource="cn/vincent/pojo/User.hbm.xml"/> </session-factory> </hibernate-configuration>
2.1 pojo 类
User
package cn.vincent.pojo; import java.io.Serializable; public class User implements Serializable { private int id; private String name; private int age; public int getId() { return id; } public void setId(int id) { this.id = id; } 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; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + age; result = prime * result + id; result = prime * result + ((name == null) ? 0 : name.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; User other = (User) obj; if (age != other.age) return false; if (id != other.id) return false; if (name == null) { if (other.name != null) return false; } else if (!name.equals(other.name)) return false; return true; } }
User.hbm.xml 即User的映射
<?xml version="1.0" encoding="UTF-8"?> <!-- 映射文件的头文件和hibernate.cfg.xml的头文件不一样 --> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="cn.vincent.pojo"> <class name="User" table="t_user"> <id name="id" column="id" type="int"> <generator class="native"></generator> </id> <property name="name" column="name" type="java.lang.String"/> <property name="age" column="age" type="int"/> </class> </hibernate-mapping>
2.2 util 工具类
package cn.vincent.util; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; import org.hibernate.service.ServiceRegistry; public class HibernateUtil { private static Configuration cfg; private static ServiceRegistry registry; private static SessionFactory factory; private static ThreadLocal<Session> session; static{ //初始化 cfg=new Configuration().configure(); registry=new StandardServiceRegistryBuilder() .applySettings(cfg.getProperties()) .build(); factory=cfg.buildSessionFactory(registry); session=new ThreadLocal<>(); } //获取连接 public static Session getSession(){ if(session.get()==null){ session.set(factory.openSession()); } return session.get(); } //释放资源 public static void close(){ if(session.get()!=null){ session.get().close(); session.set(null); } } }
2.3 单元测试
HibernateTest
package cn.vincent.hibernate; import java.util.List; import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.Test; import cn.vincent.pojo.User; import cn.vincent.util.HibernateUtil; public class HibernateTest { //根据id查询单个对象 @Test public void testGetById(){ Session session = HibernateUtil.getSession(); User user=(User)session.get(User.class, 2); System.out.println(user.getId()+"----"+user.getName()+"----"+user.getAge()); HibernateUtil.close(); } //添加数据 @Test public void testSave(){ Session session=null; Transaction tx =null; try { session = HibernateUtil.getSession(); User user= new User(); user.setName("金庸"); user.setAge(80); //开启事务 tx = session.beginTransaction(); //返回 被保存数据的id session.save(user); //提交事务 tx.commit(); System.out.println("保存数据成功"); } catch (Exception e) { e.printStackTrace(); //回滚事务 if(tx!=null) tx.rollback(); System.out.println("保存数据失败"); }finally{ HibernateUtil.close(); } } //删除数据 @Test public void testDelete(){ Session session=null; Transaction tx =null; try { session = HibernateUtil.getSession(); //开启事务 tx = session.beginTransaction(); User user =(User)session.get(User.class, 4); session.delete(user); //提交事务 tx.commit(); System.out.println("删除数据成功"); } catch (Exception e) { e.printStackTrace(); //回滚事务 if(tx!=null) tx.rollback(); System.out.println("删除数据失败"); }finally{ HibernateUtil.close(); } } //更新 @Test public void testUpdate(){ Session session=null; Transaction tx =null; try { session = HibernateUtil.getSession(); //开启事务 tx = session.beginTransaction(); User user =(User)session.get(User.class, 4); user.setName("本拉登"); session.update(user); //提交事务 tx.commit(); System.out.println("更新数据成功"); } catch (Exception e) { e.printStackTrace(); //回滚事务 if(tx!=null) tx.rollback(); System.out.println("更新数据失败"); }finally{ HibernateUtil.close(); } } //查询所有 @Test public void testFindAll(){ Session session=null; try { session = HibernateUtil.getSession(); List<User> list = session.createCriteria(User.class).list(); for(User u:list){ System.out.println(u); } } catch (Exception e) { e.printStackTrace(); }finally{ HibernateUtil.close(); } } }
3.单元测试运行效果
运行单元测试
如下图：
标签：cti www stand create poj inf 需要 nat ble
原文地址：https://www.cnblogs.com/Vincent-yuan/p/11198327.html
