课程管理模块设计及分析
1 课程管理模块的需求分析
2.课程相关表分析
数据建表过程如下。
CREATE TABLE `edu_course_description` (
`id` char(19) NOT NULL COMMENT '课程ID',
`description` text COMMENT '课程简介',
`gmt_create` datetime NOT NULL COMMENT '创建时间',
`gmt_modified` datetime NOT NULL COMMENT '更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='课程简介';
#
# Data for table "edu_course_description"
#
INSERT INTO `edu_course_description` VALUES ('1104870479077879809','<p>11</p>','2019-03-11 06:23:44','2019-03-11 06:23:44'),('1192252213659774977','<p>测试</p>','2019-11-07 09:27:33','2019-11-13 16:21:28'),('14','','2019-03-13 06:04:43','2019-03-13 06:05:33'),('15','','2019-03-13 06:03:33','2019-03-13 06:04:22'),('18','<p>本套Java视频完全针对零基础学员，课堂实录，自发布以来，好评如潮！Java视频中注重与学生互动，讲授幽默诙谐、细致入微，覆盖Java基础所有核心知识点，同类Java视频中也是代码量大、案例多、实战性强的。同时，本Java视频教程注重技术原理剖析，深入JDK源码，辅以代码实战贯穿始终，用实践驱动理论，并辅以必要的代码练习。</p>\n<p>------------------------------------</p>\n<p>视频特点：</p>\n<p>通过学习本Java视频教程，大家能够真正将Java基础知识学以致用、活学活用，构架Java编程思想，牢牢掌握\"源码级\"的Javase核心技术，并为后续JavaWeb等技术的学习奠定扎实基础。<br /><br />1.通俗易懂，细致入微：每个知识点高屋建瓴，深入浅出，简洁明了的说明问题<br />2.具实战性：全程真正代码实战，涵盖上百个企业应用案例及练习<br />3.深入：源码分析，更有 Java 反射、动态代理的实际应用等<br />4.登录尚硅谷官网，技术讲师免费在线答疑</p>','2019-03-06 18:06:36','2019-10-30 19:58:36');
CREATE TABLE `edu_video` (
`id` char(19) NOT NULL COMMENT '视频ID',
`course_id` char(19) NOT NULL COMMENT '课程ID',
`chapter_id` char(19) NOT NULL COMMENT '章节ID',
`title` varchar(50) NOT NULL COMMENT '节点名称',
`video_source_id` varchar(100) DEFAULT NULL COMMENT '云端视频资源',
`video_original_name` varchar(100) DEFAULT NULL COMMENT '原始文件名称',
`sort` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '排序字段',
`play_count` bigint(20) unsigned NOT NULL DEFAULT '0' COMMENT '播放次数',
`is_free` tinyint(1) unsigned NOT NULL DEFAULT '0' COMMENT '是否可以试听：0收费 1免费',
`duration` float NOT NULL DEFAULT '0' COMMENT '视频时长（秒）',
`status` varchar(20) NOT NULL DEFAULT 'Empty' COMMENT 'Empty未上传 Transcoding转码中 Normal正常',
`size` bigint(20) unsigned NOT NULL DEFAULT '0' COMMENT '视频源文件大小（字节）',
`version` bigint(20) unsigned NOT NULL DEFAULT '1' COMMENT '乐观锁',
`gmt_create` datetime NOT NULL COMMENT '创建时间',
`gmt_modified` datetime NOT NULL COMMENT '更新时间',
PRIMARY KEY (`id`),
KEY `idx_course_id` (`course_id`),
KEY `idx_chapter_id` (`chapter_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ROW_FORMAT=COMPACT COMMENT='课程视频';
#
# Data for table "edu_video"
#
INSERT INTO `edu_video` VALUES ('1182499307429339137','18','32','第一节','','',0,0,0,0,'',0,1,'2019-10-11 11:32:59','2019-10-11 11:57:38'),('1185312444399071234','14','1','12','','',0,0,0,0,'Empty',0,1,'2019-10-19 05:51:23','2019-10-19 05:51:33'),('1189434737808990210','18','44','测试','','',1,0,0,0,'Empty',0,1,'2019-10-30 14:51:55','2019-10-30 14:51:55'),('1189471423678939138','18','1181729226915577857','test','2b887dc9584d4dc68908780ec57cd3b9','视频',1,0,0,0,'Empty',0,1,'2019-10-30 17:17:41','2019-10-30 17:17:41'),('1189476403626409986','18','1181729226915577857','22','5155c73dc112475cbbddccf4723f7cef','视频.mp4',0,0,0,0,'Empty',0,1,'2019-10-30 17:37:29','2019-10-30 17:37:29'),('1192252824606289921','1192252213659774977','1192252428399751169','第一课时','756cf06db9cb4f30be85a9758b19c645','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,0,0,'Empty',0,1,'2019-11-07 09:29:59','2019-11-07 09:29:59'),('1192628092797730818','1192252213659774977','1192252428399751169','第二课时','2a02d726622f4c7089d44cb993c531e1','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,1,0,'Empty',0,1,'2019-11-08 10:21:10','2019-11-08 10:21:22'),('1192632495013380097','1192252213659774977','1192252428399751169','第三课时','4e560c892fdf4fa2b42e0671aa42fa9d','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,1,0,'Empty',0,1,'2019-11-08 10:38:40','2019-11-08 10:38:40'),('1194117638832111617','1192252213659774977','1192252428399751169','第四课时','4e560c892fdf4fa2b42e0671aa42fa9d','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,0,0,'Empty',0,1,'2019-11-12 13:00:05','2019-11-12 13:00:05'),('1196263770832023554','1192252213659774977','1192252428399751169','第五课时','27d21158b0834cb5a8d50710937de330','eae2b847ef8503b81f5d5593d769dde2.mp4',5,0,0,0,'Empty',0,1,'2019-11-18 11:08:03','2019-11-18 11:08:03'),('17','18','15','第一节：Java简介','196116a6fee742e1ba9f6c18f65bd8c1','1',1,1000,1,100,'Draft',0,1,'2019-01-01 13:08:57','2019-10-11 11:26:39'),('18','18','15','第二节：表达式和赋值语句','2d99b08ca0214909899910c9ba042d47','7 - How Do I Find Time for My ',2,999,1,100,'Draft',0,1,'2019-01-01 13:09:02','2019-03-08 03:30:27'),('19','18','15','第三节：String类','51120d59ddfd424cb5ab08b44fc8b23a','eae2b847ef8503b81f5d5593d769dde2.mp4',3,888,0,100,'Draft',0,1,'2019-01-01 13:09:05','2019-11-12 12:50:45'),('20','18','15','第四节：程序风格','2a38988892d84df598752226c50f3fa3','00-day10总结.avi',4,666,0,100,'Draft',0,1,'2019-01-01 13:09:05','2019-10-11 09:20:09');
CREATE TABLE `edu_course` (
`id` char(19) NOT NULL COMMENT '课程ID',
`teacher_id` char(19) NOT NULL COMMENT '课程讲师ID',
`subject_id` char(19) NOT NULL COMMENT '课程专业ID',
`subject_parent_id` char(19) NOT NULL COMMENT '课程专业父级ID',
`title` varchar(50) NOT NULL COMMENT '课程标题',
`price` decimal(10,2) unsigned NOT NULL DEFAULT '0.00' COMMENT '课程销售价格，设置为0则可免费观看',
`lesson_num` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '总课时',
`cover` varchar(255) CHARACTER SET utf8 NOT NULL COMMENT '课程封面图片路径',
`buy_count` bigint(10) unsigned NOT NULL DEFAULT '0' COMMENT '销售数量',
`view_count` bigint(10) unsigned NOT NULL DEFAULT '0' COMMENT '浏览数量',
`version` bigint(20) unsigned NOT NULL DEFAULT '1' COMMENT '乐观锁',
`status` varchar(10) NOT NULL DEFAULT 'Draft' COMMENT '课程状态 Draft未发布 Normal已发布',
`is_deleted` tinyint(3) DEFAULT NULL COMMENT '逻辑删除 1（true）已删除， 0（false）未删除',
`gmt_create` datetime NOT NULL COMMENT '创建时间',
`gmt_modified` datetime NOT NULL COMMENT '更新时间',
PRIMARY KEY (`id`),
KEY `idx_title` (`title`),
KEY `idx_subject_id` (`subject_id`),
KEY `idx_teacher_id` (`teacher_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ROW_FORMAT=COMPACT COMMENT='课程';
#
# Data for table "edu_course"
#
INSERT INTO `edu_course` VALUES ('1192252213659774977','1189389726308478977','1178214681139539969','1178214681118568449','java基础课程：test',0.01,2,'https://guli-file-190513.oss-cn-beijing.aliyuncs.com/cover/default.gif',4,387,1,'Normal',0,'2019-11-07 09:27:33','2019-11-18 13:35:03'),('14','1189389726308478977','1101348944971091969','1101348944920760321','XHTML CSS2 JS整站制作教程课程学习',0.00,3,'http://guli-file.oss-cn-beijing.aliyuncs.com/cover/2019/03/13/d0086eb0-f2dc-45f7-bba1-744d95e5be0f.jpg',3,44,15,'Normal',0,'2018-04-02 18:33:34','2019-11-16 21:21:45'),('15','1189389726308478977','1101348944971091969','1101348944920760321','HTML5入门课程学习',0.00,23,'http://guli-file.oss-cn-beijing.aliyuncs.com/cover/2019/03/13/22997b8e-3606-4d2e-9b4f-09f48418b6e4.jpg',0,51,17,'Normal',0,'2018-04-02 18:34:32','2019-11-12 10:19:20'),('18','1189389726308478977','1178214681139539969','1178214681118568449','Java精品课程',0.01,20,'http://guli-file.oss-cn-beijing.aliyuncs.com/cover/2019/03/06/866e9aca-b530-4f71-a690-72d4a4bfd1e7.jpg',151,737,6,'Normal',0,'2018-04-02 21:28:46','2019-11-18 11:14:52');
CREATE TABLE `edu_chapter` (
`id` char(19) NOT NULL COMMENT '章节ID',
`course_id` char(19) NOT NULL COMMENT '课程ID',
`title` varchar(50) NOT NULL COMMENT '章节名称',
`sort` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '显示排序',
`gmt_create` datetime NOT NULL COMMENT '创建时间',
`gmt_modified` datetime NOT NULL COMMENT '更新时间',
PRIMARY KEY (`id`),
KEY `idx_course_id` (`course_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ROW_FORMAT=COMPACT COMMENT='课程';
#
# Data for table "edu_chapter"
#
INSERT INTO `edu_chapter` VALUES ('1','14','第一章：HTML',0,'2019-01-01 12:27:40','2019-01-01 12:55:30'),('1181729226915577857','18','第七章：I/O流',70,'2019-10-09 08:32:58','2019-10-09 08:33:20'),('1192252428399751169','1192252213659774977','第一章节',0,'2019-11-07 09:28:25','2019-11-07 09:28:25'),('15','18','第一章：Java入门',0,'2019-01-01 12:27:40','2019-10-09 09:13:19'),('3','14','第二章：CSS',0,'2019-01-01 12:55:35','2019-01-01 12:27:40'),('32','18','第二章：控制台输入和输出',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('44','18','第三章：控制流',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('48','18','第四章：类的定义',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('63','18','第五章：数组',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('64','18','第六章：继承',61,'2019-01-01 12:27:40','2019-10-09 08:32:47');
3.添加课程分析
修改codeGenerator中的表。
生成代码。
由于课程简介不需要单独提供接口访问，而是在配合课程使用，我们可以将EduCourseDescriptionController删除。EduCourseController增加注解@CrossOrigin。
课程管理模块的主要功能和数据库建表都完成了，不过在实现功能前还需要考虑以下问题。
(1)数据怎么封装？
根据之前的经验，前端添加的数据可以通过json数据传递给后端，不过传递的数据类型是什么？传递EduCourse可以满足大部分课程信息的传递，不过无法传递课程简介，因此我们需要创建一个vo类专门用于前后端数据的传递。
(2)数据怎么添加到数据库
可能一个数据对应多张数据表，比如课程信息和课程简介。
(3)二级联动问题
选择课程分类时，通过下拉列表实现，选择一级课程分类，二级课程分类的下拉框要属于前面选择的课程分类。
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