Programming VIP

1. Export mongodb data, Tomas access information data, User-function Usage, right-click, Export Collection, can be saved as json or csv format. 2. In mongodb database, only the index contained in the primary key is duplicate data. An index is the same, not duplicate data. The primary key is the unique index of the collection. 1)mongodb data ...

Summary Jackson framework is a set of data processing tools based on Java platform, which is called "the best Java Json parser".   The Jackson framework contains three core libraries: streaming, databind and annotations. Jackson also contains other data processing class libraries, which are not explained. Jackson version: ...

In the process of Android application development, we often use some so-called architecture methods, such as mvp, mvvm, clean, etc.These methods are recommended because they greatly decouple the functional modules of our code, making it easier for our code to expand and maintain in the middle and later stages of the project. I personally rec ...

Step 1 of Dictionary to Model: Designing a Model Model properties, usually one-to-one correspondence with key s in a dictionary Question: Is it slow to generate model properties one by one? Requirements: Can you automatically generate corresponding attributes from a dictionary? Solution: Provide a categorization specifically to generate cor ...

since Previous At the end, we have completed the communication between the client and the server, i.e. sending requests to the server and returning data from the server to the client.However, we only pass data by url, and the RFC 3986 document specifies that only letters (a-z, A-Z), numbers (0-9), individual special characters, ...

Reprinted from Say JSON and JSONP, maybe you'll be clear-cut brief introduction What is jsonp JSONP(JSON with Padding) is a "usage mode" of JSON that can be used to solve cross-domain data access problems in mainstream browsers. Due to the homology policy, web pages located in server1.example.com in general cannot comm ...

I heard a long time ago about the convenience of automated packaging, but I haven't tried it. Recently, because of the project requirements, I have tried it myself. There are a lot of information about fastlane, how powerful the function is, automated testing, certificate management, screenshots and so on. But I only use the fu ...

When I first came into contact with the structure of mvp, a lot of searches on the Internet were theoretical. It was a headache to knock on it. Then I watched a wave of videos. It felt like a bright future, but the feeling of the screen was still a bit inappropriate. After watching the source code of other people in git, I changed it again. S ...

brief introduction vue and ajax AJAX, namely "Asynchronous Javascript And XML" (Asynchronous Javascript And XML), refers to a web page development technology for creating interactive web applications. Basic usage of ajax Vue itself does not support sending AJAX requests. It needs to be implemented with jquery, vue-resource s ...

Scene description -- Watch it today renren-security Source code, found that redis caches can be dynamically turned on/off in the configuration file: renren: redis: open: false #Whether to turn on redis cache true Turn on false Close If reren.redis.open=true, the data from the sys_config table will also be saved to redis If reren.red ...