Course Elementary 1881
Course Introduction:Python visualization video series using matplotlib, seaborn, pyecharts, combined with real data sets; this video is reproduced from Bilibili: BV1gz411v7F5
Course Intermediate 4516
Course Introduction:There are two main purposes for studying this course: 1. Visual panel layout adapts to the screen 2. Use ECharts to realize histogram display Core Technology: -Based on flexible.js + rem smart large screen adaptation - VScode cssrem plug-in - Flex layout - Less to use - Based on ECharts data visualization display - ECharts histogram data settings - ECharts map introduction
Course Intermediate 4740
Course Introduction:Make your own PHP framework to help you become an architect step by step. Improve the framework step by step, which involves composer, database chain operations, and various excel and pdf tools. As well as scheduled tasks, image processing, image search, command line operations, dependency injection, annotation routing, middleware, aop aspect programming, the use of mysql pessimistic locks, optimistic locks, and various PHP issues such as dealing with high concurrency.
Course Intermediate 5951
Course Introduction:Flume is a distributed, reliable system. It can efficiently collect and integrate data, and can also move large amounts of data from different sources to data centers for storage. Flume is a top-level project under Apache. Flume can not only collect and integrate log data, because the data source can be customized, Flume can be used to transmit large amounts of log data, which includes not only network transmission data, data generated by social media, email information, etc.
Can java be used as the backend of the web?
2021-07-14 11:53:01 0 2 1244
Why can backend proxies cross domains?
Why can the back-end proxy settings be cross-domain? Don't quite understand
2017-06-14 10:52:51 0 3 657
javascript - Why can't the function foo(x = x+1){ }; parameter be x=x+1?
2017-05-19 10:44:17 0 3 557
Why can you add view to $this->view->assign()
Why can you add view to $this->view->assign()
2018-04-07 14:30:57 0 3 2866
Course Introduction:The mysql field can be empty for the following reasons: 1. Data optionality, the value of some fields may be optional, and not every record needs to provide the value of this field; 2. Data integrity, the value of some fields The value may be unknown or temporarily unavailable. Allowing fields to be empty can maintain the integrity of the data; 3. Data migration and compatibility. When performing data migration or integrating with other systems, allowing fields to be empty can simplify data processing.
2023-07-25 comment 0 2332
Course Introduction:Foreign keys in MySQL can be null, supporting certain business scenarios such as optional relationships, cascading deletes, and data integrity. When set to NULL, child table rows can have no matching association with the parent table.
2024-05-01 comment 0 642
Course Introduction:Can Huawei's Hongmeng system be regarded as an extension of Android? With the increasing popularity of smartphones, mobile operating systems have become an indispensable part of people's daily lives. Among them, the Android system has always been favored by the majority of users for its openness and rich application ecosystem. However, Huawei recently launched its own new operating system, Hongmeng OS, which has attracted widespread attention and discussion. People have speculated whether Huawei's Hongmeng system can be regarded as an extension of Android, or can it become a replacement for Android? Let's discuss it together
2024-03-23 comment 0 1103
Course Introduction:Can DATE type be null in Oracle? Yes, you can use NULL values to represent empty date values.
2024-05-03 comment 0 771
Course Introduction:The reasons why Huawei mobile phones cannot be monitored may be the security of the operating system, security chips and encryption technology, security updates and vulnerability fixes, security audits and compliance, etc. Detailed introduction: 1. Operating system security. The operating system used by Huawei mobile phones is Android, but it has its own customized version, namely EMUI. Huawei has added some additional security features and optimizations to EMUI to improve system security. These security features include application permission management, automatic application freezing, application locking and privacy protection, etc., which can help users protect personal privacy and so on.
2023-09-22 comment 0 2274