HIbernate实现增删改查。

Posted 2020-08-04 李泽阳

//大配置
<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!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>
        <property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
        <property name="connection.username">sb</property>
        <property name="connection.password">sb</property>
        
        <!-- 输出所有 SQL 语句到控制台。 -->
        <property name="hibernate.show_sql">true</property>
        
        <!-- 在 log 和 console 中打印出 SQL。 -->
        <property name="hibernate.format_sql">true</property>
        <!-- 方言 -->
        <property name="hibernate.dialect">    org.hibernate.dialect.Oracle10gDialect</property>
    
    
       <!-- 关联小配置 -->
<property name="hbm2ddl.auto">update</property>  
    
//与小配置进行关联     
<mapping  resource="entity/Student.hbm.xml"/>
   </session-factory>

</hibernate-configuration>

 

//小配置
<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 
 <hibernate-mapping package="entity">
     <class name="Student" table="Student">
         <id name="id" type="int" column="id">
         </id>
         <property name="name" type="string" column="name"/>
         <property name="age" type="int" column="age"/>
     </class>    
 </hibernate-mapping>

 

package entity;
//学生实体类
public class Student {
 private Integer age;
 private String name;
 private Integer id;
@Override
public String toString() {
    return "Student [age=" + age + ", name=" + name + ", id=" + id + "]";
}
public Integer getAge() {
    return age;
}
public void setAge(Integer age) {
    this.age = age;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public Integer getId() {
    return id;
}
public void setId(Integer id) {
    this.id = id;
}
}

 

//工具类 方便调用 更简洁
package Util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
    private static Configuration cf=new Configuration().configure();
    private static SessionFactory sf=cf.buildSessionFactory();
    public static  Session getSession(){
        return sf.openSession();
    }
    public static void  CloseSession(){
    getSession().close();
    }
}

 

1 public static void main(String[]args){
2  Class clazz=Student.class();
3  System.out.println(clazz);
4 }

Session session;
Transaction tx;
@Before   //方法执行前
public void beffore(){
  session=HibernateUtil.getSession();
  tx=Session.beginTransaction;
}
@After     //方法之前后
public void after(){
tx.commit();
HibernateUtil.CloseSession;
}

1.增加

public void addtest(){
//创建学生对象
 Student stu=new Studetn();
 stu.setId(1);
 stu.setName("李泽阳");
 stu.sestage(23);
 
//找到和数据库的接口 Session---SessionFactory---configur.buidSessionFactory();
 Configuration cf=new Configurration().Configur("Hibernate.cfg.xml");
 SessionFactory sf=cf.buildSessionFactory();
 session=sf.openSession();
 tx=Session.beginTransaction();
//保存
Session.save(stu);
}

2.删除

public void deltest(){
 Student stu=new Student();
 stu.setId(1);
 Session.delect(stu);
 System.out.println("delect OK!");
}

3.修改

public void updatetest(){
 Student stu=(Student)Session.get(Student.class,1);
 stu.setName("阳阳阳");
 Session.update(stu);
 System.out.println("update OK!");
}

4.查询

public void selecttest(){
 Student stu=(Student)Session.get(Student.class,1);
 System.out.println("select OK!");
}