<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.ruoyi.system.mapper.config.ArticleMapper">
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<update id="deleteArticleClass">
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UPDATE t_article SET class_id = null WHERE class_id = #{classId}
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</update>
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</mapper>
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