mybatis 基本配置

kution

　　props.properties
　　是一个jdbc的属性文件， 内容略
　　配置文件
　　<?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><properties resource="props.properties"></properties><environments default="development"><environment id="development"><transactionManager type="JDBC" /><dataSource type="POOLED"><property name="driver" value="${jdbc.driverClassName}" /><property name="url" value="${jdbc.url}" /><property name="username" value="${jdbc.username}" /><property name="password" value="${jdbc.password}" /></dataSource></environment></environments><mappers><mapper resource="cn/ibatis/UserMapper.xml" /></mappers></configuration>
　　映射文件
　　<?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.ibatis.User"><select  id="selectUser"  parameterType="int" resultType="cn.ibatis.User">select *from t_user where id = #{id}</select></mapper>
　　测试
　　package cn.ibatis;import java.io.IOException;import java.io.Reader;import org.apache.ibatis.io.Resources;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;public class UserDemo {public static void main(String[] args) throws IOException {String resource = "SqlMapConfig.xml";Reader reader = Resources.getResourceAsReader(resource);SqlSessionFactory sqlMapper = new SqlSessionFactoryBuilder().build(reader);SqlSession session = sqlMapper.openSession();User user = (User) session.selectOne("cn.ibatis.User.selectUser", 1);System.out.println(user.getUsername());}}
　　注释略
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