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如图所示
我的项目需要将已经爬取的coursera数据导入数据库,以备后续工作使用,如php等
现在数据已经爬取完毕,如图格式存在文件夹中,图片所示属于一个目录,我是一个数据菜鸟,不知道如何设计数据库才能将这几级数据正确的存在mysql中呢?(使用navicat),望各位高手不吝赐教,小弟感激不尽!
如图所示
我的项目需要将已经爬取的coursera数据导入数据库,以备后续工作使用,如php等
现在数据已经爬取完毕,如图格式存在文件夹中,图片所示属于一个目录,我是一个数据菜鸟,不知道如何设计数据库才能将这几级数据正确的存在mysql中呢?(使用navicat),望各位高手不吝赐教,小弟感激不尽!
很简单,你需要把课程和目录分开保存,我举个例子:
<code class="sql">create table course( id int not null auto_increment, course_name varchar(32), url varchar(64), category_id int, course_desc varchar(512), primary key (id), foreign key (category_id) references category(id) on delete cascade ); create table category( id int not null auto_increment, category_name varchar(32), parent_id int, primary key (id), foreign key (parent_id) references category(id) on delete cascade ); insert into category(id, category_name, parent_id) values (1, "Computer science", null), (2, "Algorithms", 1), (3, "Design & Product", 1), (4, "Software development", 1); insert into course(id, course_name, url, category_id, course_desc) values (1, "Software Engineering Management", "https://course.scut.cn/sem", 4, "Software engineering management could be described simply as a management position in the software industry. "); </code>
外键是让你看清楚表的关系,并不是一定要有。
<code>mysql> select * from course \G *************************** 1. row *************************** id: 1 course_name: Software Engineering Management url: https://course.scut.cn/sem category_id: 4 course_desc: Software engineering management could be described simply as a management position in the software industry. 1 row in set (0.00 sec) mysql> select * from category; +----+----------------------+-----------+ | id | category_name | parent_id | +----+----------------------+-----------+ | 1 | Computer science | NULL | | 2 | Algorithms | 1 | | 3 | Design & Product | 1 | | 4 | Software development | 1 | +----+----------------------+-----------+ 4 rows in set (0.00 sec)</code>
id 课程编号
pid 课程父节点编号
name 课名
desc 课信息
url 课程url
...