MyBatis的一个小例子

1.书写MyBatis-Config-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>    <typeAliases>        <typeAlias alias="User" type="cn.swt.entity.UserInfo" />    </typeAliases>    <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/message" />                <property name="username" value="root" />                <property name="password" value="123456" />            </dataSource>        </environment>    </environments>    <mappers>          <mapper resource="UserDao.xml"></mapper>    </mappers></configuration>

2.书写UserDao.xml 

<?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"><mapper namespace="cn.swt.dao.UserDao1">    <select id="all" resultType="User">        select id,name,pwd from userinfo where id=#{id}    </select></mapper>

3.书写接口

package cn.swt.dao;import cn.swt.entity.UserInfo;import org.apache.ibatis.annotations.Param;import java.util.List;/** * Created by Administrator on 2017/6/28. */public interface UserDao1 {   public UserInfo all(@Param("id") int id);}
4.书写测试类

//psvmString resource="MyBatis-Config.xml";try {    Reader reader = Resources.getResourceAsReader(resource);    SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);    SqlSession session = ssf.openSession();    UserDao1 mapper = session.getMapper(UserDao1.class);    System.out.println(mapper.all(1).getName());    session.close();} catch (Exception e) {    e.printStackTrace();} finally {}