代码整理，及应用MybatisPlus，使得可不用mapper.xml配置文件进行查询demo实现

liurunyu

2023-11-08 30bcaac63cafe8ed46a7ab09eac6b90fa7aea1d5

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distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.5/apache-maven-3.9.5-bin.zip
wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar