目录前言一、SQL server的操作二、VS2022的操作（一）浏览客户信息表（二）添加公共控件对表进行查询、删除、插入操作（三）设置系统主界面，通过按键打开另一个窗口总结前言
Let\'s say I have 2 instance of a class called \'Animal\'. Animal has 3 fields: Name, Age, and Type The name field is nullable, so before I insert an instance of Animal as a Lucene indexed document,
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