question-bank-admin/src/main/resources/mapper/PaperMapper.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.tocean.app.mapper.PaperMapper">
    <select id="page" resultType="com.tocean.app.entity.Paper">
        SELECT * FROM t_paper p
        <where>
            <if test="request.name != null and request.name !=''">
                AND p.name LIKE CONCAT('%', #{request.name}, '%')
            </if>
            <if test="request.gradeName != null and request.gradeName !=''">
                AND p.grade_name = ('%', #{request.gradeName}, '%')
            </if>
            <if test="request.subject != null and request.subject !=''">
                AND p.subject = #{request.subject}
            </if>
            <if test="request.isDel != null">
                AND p.is_del = #{request.isDel}
            </if>
        </where>
        ORDER BY p.id DESC
    </select>

</mapper>