Mybatis开发环境搭建实现数据的增删改查功能

<?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><!-- 拿到数据库信息，这是db.properties的内容driver=com.MySQL.jdbc.Driverurl=jdbc:mysql://localhost:3306/usertestusername=rootpassword=root--!><properties resource="db.properties"></properties><!-- 别名优化--!><typeAliases><!-- <package name="com.leige.entity" /> --><typeAlias type="com.leige.entity.User" alias="user"/></typeAliases><!--设置框架工作模式development开发者模式 ，work是工作模式 --><environments default="development"><environment id="development"><transactionManager type="jdbc"></transactionManager><!-- 配置数据源 --><dataSource type="POOLED"><!-- 注册驱动 --><property name="driver" value="${driver}"/><!-- 连接数据库 --><property name="url" value="${url}"/><!-- 密码帐号登录 --><property name="username" value="${username}"/><property name="password" value="${password}"/></dataSource></environment></environments><!-- 使用xml，mapper resource需要设置--!><!-- <mappers><mapper resource="com/leige/entity/UserMappen.xml"></mapper></mappers> --><!--使用注解，mapper配置class，查询方法写在接口中--!><mappers><mapper class="com.leige.impl.UserImpl"/></mappers>

<?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"><!-- 建立表与类的映射关系有两种：一个是xml(倾向)，另一个是注解 --><mapper namespace="com.leige.entity.UserMappen"><!-- 查询全部 --><select id="selectAll" resultType="user">select * from user</select><!-- 增加用户 --><update id="insertUser" parameterType="user">insert into user values (null,#{name},#{password},#{age})</update></mapper>使用注解则用接口public interface UserImpl {//更新用户，更新用@update，查询用@select，插入用@insert，删除使用@delete这些注解@Update("update user set name=#{name} where id=#{id}")public void updateUser(User user);}demo测试代码public class Demo {static InputStream in = null;static SqlSessionFactory ssf = null;static{in = Demo.class.getClassLoader().getResourceAsStream("config.xml");ssf = new SqlSessionFactoryBuilder().build(in);}public static void main(String[] args) {//selectAll();//insertUser();updateUser();}//查询全部public static void selectAll(){SqlSession session = ssf.openSession();List<User> list = session.selectList("com.leige.entity.UserMappen.selectAll");System.out.println(list);session.close();}//增加用户public static void insertUser(){SqlSession session = ssf.openSession();User user = new User();user.setName("小霸王");user.setPassword("aaaaa");user.setAge(25);int num = session.insert("com.leige.entity.UserMappen.insertUser",user);session.commit();System.out.println(num);session.close();}//修改用户信息public static void updateUser(){SqlSession session = ssf.openSession();UserImpl userImpl = session.getMapper(UserImpl.class);User user = new User();user.setName("我是大头鬼");user.setPassword("aaaaa");user.setAge(25);user.setId(79);userImpl.updateUser(user);session.commit();session.close();}}</configuration>