症状为空，抛出异常

zqy

2024-05-20 defde121e8da3baa0e9ace575d6c2cf42a54e933

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<?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">
<!--namespace=绑定一个对应的Dao/Mapper接口-->
<mapper namespace="com.ruoyi.mapper.MemoBookMapper">
 
</mapper>