mapper.xml映射文件的头部代码

<?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="XXXXX">
  <select id="XXXX" resultType="XXX">
    //数据库的语句
  </select>
</mapper>