CinemaDemo/target/classes/com/example/cinema/data/MovieLikeMapper.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.example.cinema.data.MovieLikeMapper">
    <insert id="insertOneLike" >
        insert into movie_like(user_id,movie_id)
        values(#{userId}, #{movieId})
    </insert>

    <select id="selectLikeMovie" resultType="int">
        select count(*) from movie_like where movie_id = #{movieId} and user_id=#{userId}
    </select>

    <select id="selectLikeNums" resultType="int">
        select count(*) from movie_like where movie_id = #{movieId}
    </select>

    <delete id="deleteOneLike">
        delete from movie_like where movie_id = #{movieId} and user_id=#{userId}
    </delete>
    
    <select id="getDateLikeNum" resultMap="MovieLike">
        select count(*) as like_num ,DATE(like_time) as `time` from movie_like ml where movie_id=#{movieId} GROUP BY DATE(ml.like_time)
    </select>

    <resultMap id="MovieLike" type="com.example.cinema.vo.DateLikeForm">
        <result column="time" property="likeTime"></result>
        <result column="like_num" property="likeNum"></result>
    </resultMap>

</mapper>