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Foreword: In actual development projects, an exposed interface often faces many requests. Let's explain the concept of idempotency: the impact of any multiple execution is the same as that of a single execution. According to this meaning, the ultimate meaning is that the impact on the database can only be one-time and can not be repeated. How t ...

brief introduction Sometimes the installation and deployment of the server, each time in some process, forgot to always find out the previous notes, now the whole process will be sorted out. This is Centos 7.2, which will help you to spend less time looking for notes in the future. Blog Address My github address Welcome your attention Servi ...

1. There is a test method in MainController.class.php controller, and there is also a deng method. I want to use the deng method in the test method. Expressed as <?php namespace Home\Controller; use Think\Controller; class MainController extends controller { public function test() { $this->deng(); } 2. There is a test ...

What is rest_framework serialization? When writing a project that does not separate the front and back ends: We have form components to help us do data validation We have template syntax, and queryset objects extracted from the database do not need to be reformatted artificially. When we write front-end and back-end separation projects: We ...

python third day of study First, make up for yesterday's arrears: for loop A for loop in python can loop items of any sequence, such as a list or a string Each element in a list can be looped Grammar: lb = 'asdasd' for a in lb: print(a) Result entered: a s d a s d for can be indexed independently and is a general ...

Introduction to Log AnalyrThe Log Analyzer tool provides an easy-to-use, powerful front-end for searching, viewing and analyzing network activity data, including system logs, event logs and many other log sources. Since it only presents data to our users, the data itself needs to be collected by another program, such as syslogd, rsyslog (now th ...

Background: Before I looked at the company's data import platform, imported user order records, using SpringBook's own Scheduled task scheduling function, and then notified developers by e-mail whether the task scheduling was successful. Overall, the function is to support the existing business, but developers can not clearly understand the sta ...

The replacement process for the first page starts with making a static page and getting it here:   You will find that there are no pictures and no stylesheets in this page. Because we just throw web pages over, the corresponding pictures and stylesheets aren't thrown over Pictures or anything should be thrown in: Then open the index.html home ...

Algorithm Task Given a sequence of length \(n\), support for single point modification and interval \(kth\) queries is required to force online. Limitation If the input data is considered to be all of the same order as \(n\), the space-time complexity of the algorithm is required \(O(n \log^2n)\) Solution In fact, there is no half-money relatio ...

1. Node planning: Two ways: one master + many slaves, many to many slaves, the second way to share the master node, easy to expand and reduce capacity. Container name container IP address Map port number Service Running Mode Redis-master1 172.1.50.11 6391->6379,16391->6379 master ...