mybatis实战教程一：开发环境搭建

<?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>
　　<!--定义别名-->
    <typeAliases>
        <typeAlias alias="User" type="com.yihaomen.mybatis.model.User"/>
    </typeAliases>
    <!--定义数据库信息，默认使用development数据库构建环境-->
    <environments default="development">
        <environment id="development">
　　　　　　　<!--采用JDBC事务管理-->
            <transactionManager type="JDBC"/>
　　　　　　  <!--配置数据库连接信息-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis-learn" />
                <property name="username" value="root"/>
                <property name="password" value="tiger"/>
            </dataSource>
        </environment>
    </environments>
    <!--定义映射器-->
    <mappers>
        <mapper resource="com/yihaomen/mybatis/model/User.xml"/>
    </mappers>
</configuration>

public class User {
    private int id;
    private String userName;
    private String userAge;
    private String userAddress;
　　setters & getters
}

<?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="com.yihaomen.mybatis.models.UserMapper">
    <select id="selectUserByID" parameterType="int" resultType="User">
        select * from `user` where id = #{id}
    </select>
</mapper>

import com.yihaomen.mybatis.model.User;
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 java.io.IOException;
import java.io.Reader;

public class Test {
    private static SqlSessionFactory sqlSessionFactory;
    private static Reader reader;
    static {
        try {
            reader = Resources.getResourceAsReader("configuration.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static SqlSessionFactory getSession() {
        return sqlSessionFactory;
    }

    public static void main(String[] args) {
        SqlSession session = sqlSessionFactory.openSession();
        try {
            User user = (User) session.selectOne("com.yihaomen.mybatis.models.UserMapper.selectUserByID", 1);
            System.out.println(user.getUserAddress());
        } finally {
            session.close();
        }
    }
}