Programmer Think

1. What is thread pool When we want to use a thread, we can create a thread, but if we want to use multiple threads, we need to create multiple threads. But threads are a kind of restricted system resources, which can not be generated indefinitely, and the creation and destruction of threads will produce corresponding overhead. If threads are c ...

ABSTRACT: Before doing a small game platform project, there was a "user center" module, which involved the function of uploading avatars. When uploading pictures on mobile terminals, they are all local pictures of mobile phones, and the local pictures are generally relatively large. Take smart phones today, usually ma ...

1. Index: Two new tables, T1 and T2, are created as follows: When both tables are queried the same way, the T1 table uses an index, but the T2 table does not scan the full table. select * from t1 where id=10; select * from t2 where id=10; This is mainly because the values of the clustering factor in the T1 table ...

Reprinted please indicate the source! I. concept Balanced Binary Tree is a special Binary Search Tree. For Binary Search Tree, please check the previous blog. java implementation of binary search tree What's special about binary search tree? It's clear to understand the basic of binary search tree. Inserting values into binary search tree seque ...

Contents of this article:1.update statement2.delete statement　2.1 Form Delete　2.2 Multi-table Deletion3.truncate table 1.update statement update is used to modify records in a table. # Form update syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference [PARTITION (partition_list)] SET col1={expr1|DEFAULT} [,col2={expr2|DEFAULT}] ...

Initial users of CMake or those who don't know much about it may often be stumbled by such issues as path inclusion, library search paths, link paths, RPath, which are easy tasks when performing gcc manually or writing makefile s. In fact, I had a lot of doubts, but after a long time of practice and reading manual, I finally got a relatively c ...

My own project used Baidu Map api, I will explain the part I used. First, let's look at a few websites. http://lbsyun.baidu.com/ This is the home page of Baidu Map Open Platform. http://lbsyun.baidu.com/index.php?title=jspopular/openlibrary This is the home page of the javascript docking Baidu Map api. http://lbsyun.baidu.com/i ...

Interview algorithm code knowledge combing series Algorithmic knowledge combing (1) - sorting algorithmAlgorithmic Knowledge Combing (2) - String Algorithms Part 1Algorithmic Knowledge Combing (3) - String Algorithms Part 2Combing Algorithmic Knowledge (4) - Array Part 1Algorithmic Knowledge Combing (5) - Array Part 2Combing Algorithmic Knowled ...

1. variable Less's variable name starts with the @ symbol: @mainColor: #0982c1; @siteWidth: 1024px; @borderStyle: dotted; body { color: @mainColor; border: 1px @borderStyle @mainColor; max-width: @siteWidth; } The preprocessor will eventually produce the same result: body { color: #0982c1; border: 1px ...

JQuery is a very convenient library for operating DOM. Although jQuery is used less and less with the popularity of frameworks such as React and Vue nowadays, many of these ideas are worth learning. This article will introduce how to implement a simplified version of jQuery from scratch. Here, I name this library Clus(class homophonic) The foll ...