VIP23/novel-demo/src/main/resources/mapper/BookInfoMapper.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="com.sf.mapper.BookInfoMapper">
    <!-- 点击量+1 -->
    <update id="addVisitCount">
        update book_info set visit_count = visit_count +1
        where id = #{bookId}
    </update>
</mapper>