MyBatis的简单使用 基于MyBatis的简单使用(推荐)

<?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.mysql.jdbc.Driver"/>
  <property name="url" value="jdbc:mysql://localhost:3306/mobile"/>
  <property name="username" value="zhou"/>
  <property name="password" value="123456"/>
  </dataSource>
 </environment>
 </environments>
 <mappers>
 <mapper resource="com/entity/UserMapper.xml"/>
 </mappers>
</configuration>

<!-- 配置文件的根元素 --> 
<configuration> 
 <!-- 属性：定义配置外在化 --> 
 <properties></properties> 
 <!-- 设置：定义mybatis的一些全局性设置 --> 
 <settings> 
  <!-- 具体的参数名和参数值 --> 
  <setting name="" value=""/> 
 </settings> 
 <!-- 类型名称：为一些类定义别名 --> 
 <typeAliases></typeAliases> 
 <!-- 类型处理器：定义Java类型与数据库中的数据类型之间的转换关系 --> 
 <typeHandlers></typeHandlers> 
 <!-- 对象工厂 --> 
 <objectFactory type=""></objectFactory> 
 <!-- 插件：mybatis的插件,插件可以修改mybatis的内部运行规则 --> 
 <plugins> 
  <plugin interceptor=""></plugin> 
 </plugins> 
 <!-- 环境：配置mybatis的环境 --> 
 <environments default=""> 
  <!-- 环境变量：可以配置多个环境变量，比如使用多数据源时，就需要配置多个环境变量 --> 
  <environment id=""> 
   <!-- 事务管理器 --> 
   <transactionManager type=""></transactionManager> 
   <!-- 数据源 --> 
   <dataSource type=""></dataSource> 
  </environment> 
 </environments> 
 <!-- 数据库厂商标识 --> 
 <databaseIdProvider type=""></databaseIdProvider> 
 <!-- 映射器：指定映射文件或者映射类 --> 
 <mappers></mappers> 
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- namespace可以不加xml后缀 -->
<mapper namespace="com.entity.UserMapper">
<!-- 单个对象查询 -->
 <select id="selectUser" parameterType="int" resultType="com.entity.User">
 select * from user where id = #{id}
 </select>
 <!--查询列表 -->
 <resultMap id="userList" type="com.entity.User">
 <result property="id" column="id" />
 <result property="username" column="username"/>
 <result property="password" column="password"/>
</resultMap>
 <select id="selectAll" resultMap="userList">
 select * from user
 </select>
 <!--插入数据 -->
 <insert id="insert" >
 insert into User (username,password) values(#{username},#{password})
 </insert>
 <!--更新数据 -->
<update id="update">
 update User set username = #{username},password = #{password} where id = #{id}
</update>
<!--删除数据 -->
<delete id="delete">
 delete from User where id = #{id}
</delete>
</mapper>

package com.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

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

import com.entity.User;
/**
 * 
 * @author 坚持到你GL
 *
 */
public class Test {
 private static SqlSession session=null;
 public static SqlSession mySession() {
  //你的MyBatis的配置文件地址
  String resource = "mybatis-config.xml";
  InputStream inputStream=null;
  try {
   //IO解析xml文件
   inputStream = Resources.getResourceAsStream(resource);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  //创建一个SqlSessionFactoryBuilder对象，获得SqlSessionFactory 的实例
  SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
  //开启SqlSession
   session=sqlSessionFactory.openSession();
  return session;
 }
 private static void select(){
  //selectUser是实体类映射文件的中设置的id
  User user=mySession().selectOne("selectUser",2);
  System.out.println(user);
 }
 private static void selectAll() {
  List<User> list=mySession().selectList("selectAll");
  for (User user : list) {
   System.out.println(user);
  }
 }
 private static void insert() {
  User insertuser=new User("zhou","123456");
  mySession().insert("insert",insertuser);
  session.commit();
 }
 private static void update() {
  User updateuser =new User(9,"admin","admin");
  mySession().update("update", updateuser);
  session.commit();
 }
 private static void delect() {
  mySession().delete("delete", 10);
  session.commit();
 }
 public static void main(String[] args) {
 
 selectAll();
 }
}