mybatis3.0的使用

mybatis-3.0.6

1.首先是User类，对应数据库中的user table.

package com.mybatis.bean;

public class User {
 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 String toString() {
  return id + " " + name + " " + age;
 }
 
 
}

2.是User.xml,映射文件，

<?xml version="1.0" encoding="UTF-8" ?>   
<!DOCTYPE mapper   
PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"   
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">   
   
<mapper namespace="com.mybatis.bean.UserMapper">   
    <select id="selectOne" parameterType="int" resultType="com.mybatis.bean.User">   
        select * from [user] where id = #{id}   
    </select>   
   
    <select id="selectList" resultType="com.mybatis.bean.User">
     select * from [user]
    </select>
   
    <insert id="insertUser" parameterType="com.mybatis.bean.User">
     insert into [user] (id, name, age) values(#{id}, #{name}, #{age})
    </insert>
   
    <update id="updateUser" parameterType="com.mybatis.bean.User">
     update [user] set name = #{name} where id = #{id}
    </update>
   
    <delete id="deleteUser" parameterType="int">
     delete from [user] where id = #{id}
    </delete>
</mapper> 

3.配置文件configuration.xml

<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE configuration  
    PUBLIC "-//mybatis.org//DTD Config 3.0//EN"  
    "http://mybatis.org/dtd/mybatis-3-config.dtd">   

<configuration> 
    <environments default="development">  
        <environment id="development">  
            <transactionManager type="JDBC"/>  
            <dataSource type="POOLED">  
                <property name="driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>  
                <property name="url" value="jdbc:sqlserver://localhost;database=mydatabase;"/>  
                <property name="username" value="dba"/>  
                <property name="password" value="1234"/>  
            </dataSource>  
        </environment>  
    </environments>  
    <mappers>  
        <mapper resource="com/mybatis/bean/User.xml"/>  
    </mappers> 
</configuration>

4.写一个工具类.

package com.mybatis.until;

import java.io.IOException;
import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MybatisUntil {
 private static SqlSessionFactory sqlSessionFactory = null; 
     
 static { 
  String resource = "configuration.xml";  
     Reader reader = null; 
    
     try { 
      reader = Resources.getResourceAsReader(resource); 
     } catch (IOException e) { 
         e.printStackTrace(); 
     }        
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); 
   } 
      
    public static SqlSessionFactory getSqlSessionFactory(){ 
         return sqlSessionFactory; 
    } 

}

6.Dao类

package com.mybatis.dao;

import java.util.List;

import org.apache.ibatis.session.SqlSession;

import com.mybatis.bean.User;
import com.mybatis.until.MybatisUntil;

public class UserDao {
 
    public User query(int id){ 
     SqlSession session = MybatisUntil.getSqlSessionFactory().openSession(); 
     User user = null; 
    
     try{ 
      user = (User)session.selectOne("com.mybatis.bean.UserMapper.selectOne", id); 
     }catch(Exception e){ 
      e.printStackTrace(); 
     }finally{ 
      session.close(); 
     } 
    
     return user; 
    } 
   
    public List<User> queryAll(){
     SqlSession session = MybatisUntil.getSqlSessionFactory().openSession();
     List<User> list = null;
    
     try {
   list = session.selectList("com.mybatis.bean.UserMapper.selectList");
  } catch (Exception e) {
   e.printStackTrace();
  }finally{
   session.close();
  }
     return list;
    
    
    }
   
    public void insertUser(User user){
     SqlSession session = MybatisUntil.getSqlSessionFactory().openSession();
    
     try {
      session.insert("com.mybatis.bean.UserMapper.insertUser", user);
      session.commit();
     } catch (Exception e) {
      e.printStackTrace();
     }finally{
      session.close();
     }
    }
   
    public void updateUser(User user){
   SqlSession session = MybatisUntil.getSqlSessionFactory().openSession();
     
   try {
    session.update("com.mybatis.bean.UserMapper.updateUser", user);
    session.commit();
   } catch (Exception e) {
    e.printStackTrace();
   }finally{
    session.close();
   }
     
    }
   
    public void delete(int id){
     SqlSession session = MybatisUntil.getSqlSessionFactory().openSession();
    
     try {
   session.delete("com.mybatis.bean.UserMapper.deleteUser", id);
   session.commit();
  } catch (Exception e) {
   e.printStackTrace();
  }finally{
   session.close();
  }
    
    
    }

}

 

7.测试类

package com.mybatis.test;

import java.util.Iterator;
import java.util.List;

import com.mybatis.bean.User;
import com.mybatis.dao.UserDao;

public class MybatisTest {
 public static void main(String[] args) {
  UserDao userDao = new UserDao();
//  User user = userDao.query(1);
  
//  System.out.println(user);
  
//  List<User> list = userDao.queryAll();
//  System.out.println(list.size());
//  Iterator<User> iter = list.iterator();
//  
//  while(iter.hasNext()){
//   System.out.println(iter.next());
//  }
  
//  User user = new User();
//  user.setId(3);
//  user.setName("iori");
//  user.setAge(20);
//  userDao.insertUser(user);
  
//  User user = new User();
//  user.setId(3);
//  user.setName("iori");
//  user.setAge(20);
//  userDao.updateUser(user);
  
//  userDao.delete(3);
 }
}