Mybatis框架搭建

1、dynamicProject工程結構

2、全局配置文件mybais-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>
    <properties resource="db.properties"></properties>
	<!-- 爲User實體類設置別名 -->
	<typeAliases >
	    <typeAlias type="com.jie.mybatis.entity.User" alias="User"/>
	</typeAliases>
    <!-- 和spring整合後將去除environments配置 -->
    <environments default="development">
        <environment id="development">
            <!-- 使用jdbc事務管理，由mybatis管理 -->
            <transactionManager type="jdbc"></transactionManager>
            <!-- 數據庫連接池，由mybatis管理 -->
            <dataSource type="POOLED">
                <property name="driver" value="${driver}" />
				<property name="url" value="${url}" />
				<property name="username" value="${username}" />
				<property name="password" value="${password}" />
            </dataSource>
        </environment>
    </environments>   
    <!-- 配置映射文件 -->
    <mappers>
		<mapper resource="com/jie/mybatis/mapper/userMapper.xml" />
	</mappers> 
</configuration>

3、映射文件mapper.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">
  <!-- 命名空間指向dao接口 -->
<mapper namespace="com.jie.mybatis.dao.UserDao">
    <!-- id對應dao接口中方法的名字， parameterType指輸入類型，resultType是輸出類型，
    	正常是實體類對象，通過設置別名後不用寫報名加類名-->
    <select id="findUserById" parameterType="int" resultType="User">
        select * from userInfo where userId = #{id}
    </select>
</mapper>

4、測試類

public class MybatisTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			test1();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static void test1() throws IOException {
		// 加載配置文件得到sqlsessionFactory工廠
		// 構建sqlSessionFactor
		String resource = "mybatis-config.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
		// 通過工廠得到SqlSession
		SqlSession session = sessionFactory.openSession();
		UserDao userDao = session.getMapper(UserDao.class);
		User user = userDao.findUserById(1);
		System.out.println(user);
	}
}

5、輸出結果
User [userId=1, userName=嘿你傑哥, userPassword=123456, userSex=男]