[django] - CRUD operation of models

  Increase Create 1. preservation To create an object, use the keyword parameter of the model class to instantiate it, then call save() to save it to the database. #Method 1: the Test module usually creates and saves objects in one step models.Entity.objects.create(c1='xx', c2='oo') # Add a p ...

Posted on Mon, 10 Feb 2020 23:41:13 -0800 by jamessw

109. Processing of large csv files

The HttpResponse object will return the responded data as a whole, at which point if the data is very large, the browser will exceed the default timeout and return the timeout if it does not get a response from the server for a long time.Streaming HttpResponse, on the other hand, returns the responded ...

Posted on Mon, 10 Feb 2020 17:29:30 -0800 by mebar3

Seven IPC communication mechanisms

Article directory 1.pipe 2.fifo: named pipe 3.signal: signal 4. shared memory 5. message queue 6. semaphore 7. Socket 1.pipe A pipeline allows one process to communicate with another process that has a common ancestor with it, that is, it can only be used to communicate between processes that hav ...

Posted on Mon, 10 Feb 2020 03:09:34 -0800 by sasori

Go Memory Management

Go Memory Management Go Memory management is based on TCMalloc, using continuous virtual addresses, managed in page (8k) units and multilevel caches; when allocating memory, size needs to be aligned, suitable mspan found according to best-fit, and unused memory will be split into other size mspans to ...

Posted on Sat, 08 Feb 2020 16:44:49 -0800 by tempa

Leetcode top 100 raised questions 25. Reverse nodes in k-group (Java version; Hard)

welcome to my blog Leetcode top 100 raised questions 25. Reverse nodes in k-group (Java version; Hard) Title Description Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer and is less than or equal to the length of the linked ...

Posted on Sat, 08 Feb 2020 07:16:57 -0800 by dimitris

Learning three: v-on, v-if, v-for

v-on,v-if,v-for 1 v-on 1.1 parameter If you do not need to pass parameters to v-on binding methods, you can leave the parameters blank When parentheses are omitted, the bound method can receive the event of the page as a parameter <div id="app"> <h1 @click="test1">123</h1> ...

Posted on Sat, 08 Feb 2020 04:15:01 -0800 by onedumbcoder

How to compare strings in Java?

In this article, you will learn how to compare strings and the problems that occur when you compare strings using the equal (=) operator. introduce String is a special class in Java. We use string regularly in Java programs, so comparing two strings is a common practice in Java. In this article, I try to answer the most common questions about ...

Posted on Sat, 08 Feb 2020 00:28:43 -0800 by ManWithNoName

Redis Actual - Data Structure Set Actual Get Randomized Unique Test Title

Overview: This series of blogs covers relevant content from a hands-on course recorded by debug: Getting Started with Cache Middleware Redis Technology and Application Scenario Actual Warfare (SpringBoot2.x +Redback System Design and Warfare) , interested little buddies can click to learn on their ow ...

Posted on Fri, 07 Feb 2020 18:49:51 -0800 by bongbong

ES6 - Web Music Case ideas and writing methods

Thinking and writing method of Web Music cases In some cases, we often receive the data from the background, and then write the page for the data Basic page frame <h2 class="title">Baidu Music List</h2> <ul id="list"> </ul> <footer class="footer"> <label> ...

Posted on Fri, 07 Feb 2020 06:23:11 -0800 by The_Anomaly

Summary of knowledge points of css

Preface css is not only the makeup artist of the page, but also the foundation that every front-end must master. In the work, it is often too frequent for business, so it can't be very good to precipitate the technology. This paper is mainly the notes that the author learned from his spare time. It ma ...

Posted on Fri, 07 Feb 2020 01:24:07 -0800 by nawhaley2265