2021.6.10

今天做搜索

搜索就是模糊查询，三个条件，用普通的sql语句不能实现，因为需要三个并列

所以用到了动态SQL语句，模糊查询还是一样的，只不过变成了if else

<select id="searchpaper" resultType="com.cvpr.bean.paper" parameterType="com.cvpr.bean.search">
        select * from cvpr.papers
        <where>
            1=1
            <if test="title != null">
                and title like CONCAT('%',#{title},'%')
            </if>
            <if test="authors!=null">
                and authors like CONCAT('%',#{authors},'%')
            </if>
            <if test="keywords !=null">
                and keywords like CONCAT('%',#{keywords},'%')
            </if>
            <if test="times !=null">
                <if test="times == '1'">
                    and original_link like CONCAT('%','2020','%')
                </if>
                <if test="times == '2'">
                    and original_link like CONCAT('%','2020','%') or original_link like CONCAT('%','2019','%')
                </if>
            </if>
        </where>
</select>