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一、【操作规范】
1. 如无备注，则表中的第一个id字段一定是主键且为自动增长；
2. 如无备注，则数值类型的字段请使用UNSIGNED属性；
3. 如无备注，排序字段order_id在程序中默认使用降序排列；
4. 如无备注，所有字段都设置NOT NULL，并设置默认值；
5. 如无备注，所有的布尔值字段，如is_hot、is_deleted，都必须设置一个默认值，并设为0；
6. 所有的数字类型字段，都必须设置一个默认值，并设为0；
7. 针对varchar类型字段的程序处理，请验证用户输入，不要超出其预设的长度；
8. 建表时将数据字典中的字段中文名和属性备注写入数据表的备注中(“PK、自动增长”不用写)；
9. 如无说明，建表时一律采用innodb引擎；
二、【常用表名约定】
0. 说明：表前缀用项目名称首字母缩写；所以表名都小写，单词之间用下划线分开，单词都用单数形式
1. user
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