昨日回顾

1 celery: 分布式异步任务框架,独立的
2 celery可以做的事-异步任务: 提交任务-任务函数.delay()---消息中间件(redis/rabbitmq)---worker消费---结果存储(redis)-延迟任务:任务函数.apply_async(args=(),时间对象)---消息中间件(redis/rabbitmq)---worker消费---结果存储(redis)-定时任务:启动beat(负责提交定时任务)---消息中间件(redis/rabbitmq)---worker消费---结果存储(redis)
3 单文件celery的使用(用得少)
4 包结构的celery-celery_task-celery.py   :app对象，app的配置（可以直接写，也可以再使用另外一个文件配置）可以参照官网                      修改部分参数，-task1.py :   task可能直接放在项目中app01下-task2.py :   任务5 celery集成到django中使用，需要配置import os# 执行django配置文件，环境变量加入os.environ.setdefault("DJANGO_SETTINGS_MODULE", "luffyapi.settings.dev")6 启动worker
7 启动beat
8 django-celery：第三方，让celery再django中更方便的集成-celery的配置文件直接写在django的配置文件中-启动worker，beat， python manage.py -咱们不用，问题在：django 1.11.9    4.x  ---》最新的django-celery-https://www.celerycn.io/fu-lu/django9 celery做集群，本质是搭建消息队列的集群（redis的集群搭建）10 后期如果使用rabbitmq，只需要把broker更改成broker='amqp://localhost:port'  # 消息队列的url11 首页轮播图做缓存，所有的接口缓存都这么写-redis+mysql：双写一致性-定期更新（取决于接口）,对数据准确性要求不是特别高的接口-先更新数据库，再更新缓存-先删除缓存，再更新数据库-先更新数据库，再删除缓存12 celery配置文件参数（了解）#有些情况可以防止死锁CELERYD_FORCE_EXECV=True# 设置并发worker数量CELERYD_CONCURRENCY=4#允许重试CELERY_ACKS_LATE=True# 每个worker最多执行100个任务被销毁，可以防止内存泄漏CELERYD_MAX_TASKS_PER_CHILD=100# 超时时间CELERYD_TASK_TIME_LIMIT=12*30补充 Supervisor：进程管理工具，python写的，在linux上，通过配置，保证，进程如果挂掉了，自动重启

内存与数据库的双写一致性:

https://www.cnblogs.com/liuqingzheng/p/11080680.html

今日内容

1 课程页面前端

<script>import Header from "@/components/Header"// import Footer from "@/components/Footer"export default {name: "Course",data() {return {category: 0,}},components: {Header,// Footer,}}
</script><style scoped>.course {background: #f6f6f6;}.course .main {width: 1100px;margin: 35px auto 0;}.course .condition {margin-bottom: 35px;padding: 25px 30px 25px 20px;background: #fff;border-radius: 4px;box-shadow: 0 2px 4px 0 #f0f0f0;}.course .cate-list {border-bottom: 1px solid #333;border-bottom-color: rgba(51, 51, 51, .05);padding-bottom: 18px;margin-bottom: 17px;}.course .cate-list::after {content: "";display: block;clear: both;}.course .cate-list li {float: left;font-size: 16px;padding: 6px 15px;line-height: 16px;margin-left: 14px;position: relative;transition: all .3s ease;cursor: pointer;color: #4a4a4a;border: 1px solid transparent; /* transparent 透明 */}.course .cate-list .title {color: #888;margin-left: 0;letter-spacing: .36px;padding: 0;line-height: 28px;}.course .cate-list .this {color: #ffc210;border: 1px solid #ffc210 !important;border-radius: 30px;}.course .ordering::after {content: "";display: block;clear: both;}.course .ordering ul {float: left;}.course .ordering ul::after {content: "";display: block;clear: both;}.course .ordering .condition-result {float: right;font-size: 14px;color: #9b9b9b;line-height: 28px;}.course .ordering ul li {float: left;padding: 6px 15px;line-height: 16px;margin-left: 14px;position: relative;transition: all .3s ease;cursor: pointer;color: #4a4a4a;}.course .ordering .title {font-size: 16px;color: #888;letter-spacing: .36px;margin-left: 0;padding: 0;line-height: 28px;}.course .ordering .this {color: #ffc210;}.course .ordering .price {position: relative;}.course .ordering .price::before,.course .ordering .price::after {cursor: pointer;content: "";display: block;width: 0px;height: 0px;border: 5px solid transparent;position: absolute;right: 0;}.course .ordering .price::before {border-bottom: 5px solid #aaa;margin-bottom: 2px;top: 2px;}.course .ordering .price::after {border-top: 5px solid #aaa;bottom: 2px;}.course .course-item:hover {box-shadow: 4px 6px 16px rgba(0, 0, 0, .5);}.course .course-item {width: 1100px;background: #fff;padding: 20px 30px 20px 20px;margin-bottom: 35px;border-radius: 2px;cursor: pointer;box-shadow: 2px 3px 16px rgba(0, 0, 0, .1);/* css3.0 过渡动画 hover 事件操作 */transition: all .2s ease;}.course .course-item::after {content: "";display: block;clear: both;}/* 顶级元素 父级元素  当前元素{} */.course .course-item .course-image {float: left;width: 423px;height: 210px;margin-right: 30px;}.course .course-item .course-image img {width: 100%;}.course .course-item .course-info {float: left;width: 596px;}.course-item .course-info h3 {font-size: 26px;color: #333;font-weight: normal;margin-bottom: 8px;}.course-item .course-info h3 span {font-size: 14px;color: #9b9b9b;float: right;margin-top: 14px;}.course-item .course-info h3 span img {width: 11px;height: auto;margin-right: 7px;}.course-item .course-info .teather-info {font-size: 14px;color: #9b9b9b;margin-bottom: 14px;padding-bottom: 14px;border-bottom: 1px solid #333;border-bottom-color: rgba(51, 51, 51, .05);}.course-item .course-info .teather-info span {float: right;}.course-item .lesson-list::after {content: "";display: block;clear: both;}.course-item .lesson-list li {float: left;width: 44%;font-size: 14px;color: #666;padding-left: 22px;/* background: url("路径") 是否平铺 x轴位置 y轴位置 */background: url("/src/assets/img/play-icon-gray.svg") no-repeat left 4px;margin-bottom: 15px;}.course-item .lesson-list li .lesson-title {/* 以下3句，文本内容过多，会自动隐藏，并显示省略符号 */text-overflow: ellipsis;overflow: hidden;white-space: nowrap;display: inline-block;max-width: 200px;}.course-item .lesson-list li:hover {background-image: url("/src/assets/img/play-icon-yellow.svg");color: #ffc210;}.course-item .lesson-list li .free {width: 34px;height: 20px;color: #fd7b4d;vertical-align: super;margin-left: 10px;border: 1px solid #fd7b4d;border-radius: 2px;text-align: center;font-size: 13px;white-space: nowrap;}.course-item .lesson-list li:hover .free {color: #ffc210;border-color: #ffc210;}.course-item .pay-box::after {content: "";display: block;clear: both;}.course-item .pay-box .discount-type {padding: 6px 10px;font-size: 16px;color: #fff;text-align: center;margin-right: 8px;background: #fa6240;border: 1px solid #fa6240;border-radius: 10px 0 10px 0;float: left;}.course-item .pay-box .discount-price {font-size: 24px;color: #fa6240;float: left;}.course-item .pay-box .original-price {text-decoration: line-through;font-size: 14px;color: #9b9b9b;margin-left: 10px;float: left;margin-top: 10px;}.course-item .pay-box .buy-now {width: 120px;height: 38px;background: transparent;color: #fa6240;font-size: 16px;border: 1px solid #fd7b4d;border-radius: 3px;transition: all .2s ease-in-out;float: right;text-align: center;line-height: 38px;}.course-item .pay-box .buy-now:hover {color: #fff;background: #ffc210;border: 1px solid #ffc210;}
</style>

2 课程表分析,编写

1 免费课:FreeCourse
2 实战课: ActualCourse
3 轻课:LiteCourse4 以实战课为例,写一套流程-字段和关联表:课程分类表实战课表章节表课时表老师表

from utils.models import BaseModel# 分类表：继承BaseModel
class CourseCategory(BaseModel):"""分类"""name = models.CharField(max_length=64, unique=True, verbose_name="分类名称")class Meta:db_table = "luffy_course_category"verbose_name = "分类"verbose_name_plural = verbose_namedef __str__(self):return "%s" % self.nameclass Course(BaseModel):"""课程"""course_type = ((0, '付费'),(1, 'VIP专享'),(2, '学位课程'))level_choices = ((0, '初级'),(1, '中级'),(2, '高级'),)status_choices = ((0, '上线'),(1, '下线'),(2, '预上线'),)name = models.CharField(max_length=128, verbose_name="课程名称")course_img = models.ImageField(upload_to="courses", max_length=255, verbose_name="封面图片", blank=True, null=True)course_type = models.SmallIntegerField(choices=course_type, default=0, verbose_name="付费类型")brief = models.TextField(max_length=2048, verbose_name="详情介绍", null=True, blank=True)level = models.SmallIntegerField(choices=level_choices, default=0, verbose_name="难度等级")pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)period = models.IntegerField(verbose_name="建议学习周期(day)", default=7)attachment_path = models.FileField(upload_to="attachment", max_length=128, verbose_name="课件路径", blank=True,null=True)status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="课程状态")students = models.IntegerField(verbose_name="学习人数", default=0)sections = models.IntegerField(verbose_name="总课时数量", default=0)pub_sections = models.IntegerField(verbose_name="课时更新数量", default=0)price = models.DecimalField(max_digits=6, decimal_places=2, verbose_name="课程原价", default=0)teacher = models.ForeignKey("Teacher", on_delete=models.DO_NOTHING, null=True, blank=True, verbose_name="授课老师")course_category = models.ForeignKey("CourseCategory", on_delete=models.SET_NULL, db_constraint=False, null=True, blank=True,verbose_name="课程分类")class Meta:db_table = "luffy_course"verbose_name = "课程"verbose_name_plural = "课程"def __str__(self):return "%s" % self.nameclass Teacher(BaseModel):"""导师"""role_choices = ((0, '讲师'),(1, '导师'),(2, '班主任'),)name = models.CharField(max_length=32, verbose_name="导师名")role = models.SmallIntegerField(choices=role_choices, default=0, verbose_name="导师身份")title = models.CharField(max_length=64, verbose_name="职位、职称")signature = models.CharField(max_length=255, verbose_name="导师签名", help_text="导师签名", blank=True, null=True)image = models.ImageField(upload_to="teacher", null=True, verbose_name="导师封面")brief = models.TextField(max_length=1024, verbose_name="导师描述")class Meta:db_table = "luffy_teacher"verbose_name = "导师"verbose_name_plural = verbose_namedef __str__(self):return "%s" % self.nameclass CourseChapter(BaseModel):"""章节"""course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE, verbose_name="课程名称")chapter = models.SmallIntegerField(verbose_name="第几章", default=1)name = models.CharField(max_length=128, verbose_name="章节标题")summary = models.TextField(verbose_name="章节介绍", blank=True, null=True)pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)class Meta:db_table = "luffy_course_chapter"verbose_name = "章节"verbose_name_plural = verbose_namedef __str__(self):return "%s:(第%s章)%s" % (self.course, self.chapter, self.name)class CourseSection(BaseModel):"""课时"""section_type_choices = ((0, '文档'),(1, '练习'),(2, '视频'))chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE,verbose_name="课程章节")name = models.CharField(max_length=128, verbose_name="课时标题")orders = models.PositiveSmallIntegerField(verbose_name="课时排序")section_type = models.SmallIntegerField(default=2, choices=section_type_choices, verbose_name="课时种类")section_link = models.CharField(max_length=255, blank=True, null=True, verbose_name="课时链接",help_text="若是video，填vid,若是文档，填link")duration = models.CharField(verbose_name="视频时长", blank=True, null=True, max_length=32)  # 仅在前端展示使用pub_date = models.DateTimeField(verbose_name="发布时间", auto_now_add=True)free_trail = models.BooleanField(verbose_name="是否可试看", default=False)class Meta:db_table = "luffy_course_Section"verbose_name = "课时"verbose_name_plural = verbose_namedef __str__(self):return "%s-%s" % (self.chapter, self.name)

3 课程表数据录入


-- 导师数据
INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (1, 1, 1, 0, '2019-07-14 13:44:19.661327', '2019-07-14 13:46:54.246271', 'Alex', 1, '老男孩Python教学总监', '金角大王', 'teacher/alex_icon.png', '老男孩教育CTO & CO-FOUNDER 国内知名PYTHON语言推广者 51CTO学院2016\2017年度最受学员喜爱10大讲师之一 多款开源软件作者 曾任职公安部、飞信、中金公司、NOKIA中国研究院、华尔街英语、ADVENT、汽车之家等公司');
INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (2, 2, 1, 0, '2019-07-14 13:45:25.092902', '2019-07-14 13:45:25.092936', 'Mjj', 0, '前美团前端项目组架构师', NULL, 'teacher/mjj_icon.png', '是马JJ老师, 一个集美貌与才华于一身的男人，搞过几年IOS，又转了前端开发几年，曾就职于美团网任高级前端开发，后来因为不同意王兴(美团老板)的战略布局而出家做老师去了，有丰富的教学经验，开起车来也毫不含糊。一直专注在前端的前沿技术领域。同时，爱好抽烟、喝酒、烫头(锡纸烫)。 我的最爱是前端，因为前端妹子多。');
INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (3, 3, 1, 0, '2019-07-14 13:46:21.997846', '2019-07-14 13:46:21.997880', 'Lyy', 0, '老男孩Linux学科带头人', NULL, 'teacher/lyy_icon.png', 'Linux运维技术专家，老男孩Linux金牌讲师，讲课风趣幽默、深入浅出、声音洪亮到爆炸');-- 分类表INSERT INTO luffy_course_category(id, orders, is_show, is_delete, created_time, updated_time, name) VALUES (1, 1, 1, 0, '2019-07-14 13:40:58.690413', '2019-07-14 13:40:58.690477', 'Python');INSERT INTO luffy_course_category(id, orders, is_show, is_delete, created_time, updated_time, name) VALUES (2, 2, 1, 0, '2019-07-14 13:41:08.249735', '2019-07-14 13:41:08.249817', 'Linux');
-- 课程表INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (1, 1, 1, 0, '2019-07-14 13:54:33.095201', '2019-07-14 13:54:33.095238', 'Python开发21天入门', 'courses/alex_python.png', 0, 'Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土', 0, '2019-07-14', 21, '', 0, 231, 120, 120, 0.00, 1, 1);INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (2, 2, 1, 0, '2019-07-14 13:56:05.051103', '2019-07-14 13:56:05.051142', 'Python项目实战', 'courses/mjj_python.png', 0, '', 1, '2019-07-14', 30, '', 0, 340, 120, 120, 99.00, 1, 2);INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (3, 3, 1, 0, '2019-07-14 13:57:21.190053', '2019-07-14 13:57:21.190095', 'Linux系统基础5周入门精讲', 'courses/lyy_linux.png', 0, '', 0, '2019-07-14', 25, '', 0, 219, 100, 100, 39.00, 2, 3);
-- 章节表INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (1, 1, 1, 0, '2019-07-14 13:58:34.867005', '2019-07-14 14:00:58.276541', 1, '计算机原理', '', '2019-07-14', 1);INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (2, 2, 1, 0, '2019-07-14 13:58:48.051543', '2019-07-14 14:01:22.024206', 2, '环境搭建', '', '2019-07-14', 1);INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (3, 3, 1, 0, '2019-07-14 13:59:09.878183', '2019-07-14 14:01:40.048608', 1, '项目创建', '', '2019-07-14', 2);INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (4, 4, 1, 0, '2019-07-14 13:59:37.448626', '2019-07-14 14:01:58.709652', 1, 'Linux环境创建', '', '2019-07-14', 3);
-- 课时表INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (1, 1, 0, '2019-07-14 14:02:33.779098', '2019-07-14 14:02:33.779135', '计算机原理上', 1, 2, NULL, NULL, '2019-07-14 14:02:33.779193', 1, 1);INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (2, 1, 0, '2019-07-14 14:02:56.657134', '2019-07-14 14:02:56.657173', '计算机原理下', 2, 2, NULL, NULL, '2019-07-14 14:02:56.657227', 1, 1);INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (3, 1, 0, '2019-07-14 14:03:20.493324', '2019-07-14 14:03:52.329394', '环境搭建上', 1, 2, NULL, NULL, '2019-07-14 14:03:20.493420', 0, 2);INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (4, 1, 0, '2019-07-14 14:03:36.472742', '2019-07-14 14:03:36.472779', '环境搭建下', 2, 2, NULL, NULL, '2019-07-14 14:03:36.472831', 0, 2);INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (5, 1, 0, '2019-07-14 14:04:19.338153', '2019-07-14 14:04:19.338192', 'web项目的创建', 1, 2, NULL, NULL, '2019-07-14 14:04:19.338252', 1, 3);INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (6, 1, 0, '2019-07-14 14:04:52.895855', '2019-07-14 14:04:52.895890', 'Linux的环境搭建', 1, 2, NULL, NULL, '2019-07-14 14:04:52.895942', 1, 4);

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171-路飞12-课程页面和课程数据表构建

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1 课程页面前端

2 课程表分析,编写

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