mysql编写数据库设计说明文档

SELECT 
COLUMN_NAME AS 字段名称, 
COLUMN_COMMENT AS 字段描述, 
COLUMN_TYPE AS 类型 ,
(CASE WHEN  IS_NULLABLE = 'YES' THEN '是' ELSE '否' END) AS 是否为空
FROM information_schema.`COLUMNS`   
WHERE  TABLE_SCHEMA = (select database()) AND  TABLE_NAME = ('Dev_mail')
ORDER BY  ORDINAL_POSITION;

效果：

 导出数据：

然后一直下一步即可。