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In-depth analysis based on Discuz security.inc.php code

This article is a detailed analysis and introduction to the code of Discuz security.inc.php. Friends in need can refer to it.

Dec 13, 2016 am 10:42 AM

Zend Framework database operation method example summary

This article mainly introduces the Zend Framework database operation method, and summarizes and analyzes the Zend Framework database operation-related function usage skills and precautions in the form of examples. Friends in need can refer to the following

Dec 13, 2016 am 10:39 AM

framework

Detailed explanation of linux yum command

yum (full name Yellow dog Updater, Modified) is a Shell front-end package manager in Fedora, RedHat and SUSE. Based on RPM package management, it can automatically download and install RPM packages from designated servers, automatically handle dependencies, and install all dependent software packages at once, without the need to download and install them again and again. yum provides commands to find, install, and delete a certain, a group, or even all software packages, and the commands are concise and easy to remember.

Dec 13, 2016 am 10:33 AM

Detailed explanation of SOCKET programming in Linux

Dec 13, 2016 am 10:30 AM

Detailed explanation of Socket

We are well aware of the value of information exchange, so how do processes in the network communicate? For example, when we open the browser to browse the web every day, how does the browser process communicate with the web server? When you use QQ to chat, how does the QQ process communicate with the server or the QQ process where your friends are? Do all these rely on sockets? So what is a socket? What are the types of sockets? There are also basic functions of socket, which are what this article wants to introduce. The main contents of this article are as follows:

Dec 13, 2016 am 10:17 AM

Socket

Introduction to socket communication

Dec 13, 2016 am 10:09 AM

socket

Detailed tutorial on linux multi-thread programming (threads implement communication code through semaphores)

This article mainly introduces a detailed tutorial on Linux multi-thread programming and provides code for threads to communicate through semaphores. Please refer to it for reference.

Dec 13, 2016 am 09:57 AM

The difference between TCP/IP, HTTP and Socket

The network is divided from bottom to top into the physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer. Through preliminary understanding, I know that the IP protocol corresponds to the network layer, the TCP protocol corresponds to the transport layer, and the HTTP protocol corresponds to the application layer. The three are essentially incomparable. Socket is the encapsulation and encapsulation of the TCP/IP protocol. Application (programmer level). It can also be said that TPC/IP protocol is a transport layer protocol, which mainly solves how to transmit data in the network, while HTTP is an application layer protocol, which mainly solves how to package data.

Dec 13, 2016 am 09:54 AM

Simple understanding of Sockets

To understand sockets, you must first familiarize yourself with the TCP/IP protocol family. TCP/IP (Transmission Control Protocol/Internet Protocol) is the Transmission Control Protocol/Internet Protocol, which defines how hosts connect to the Internet and how data is transmitted between them. Standard, literally speaking, TCP/IP is the collective name of TCP and IP protocols, but in fact, TCP/IP protocol refers to the entire TCP/IP protocol family of the Internet. Different from the seven layers of the ISO model, the TCP/IP protocol reference model classifies all TCP/IP series protocols into four abstraction layers

Dec 13, 2016 am 09:53 AM

socket

Detailed explanation of the use of linux awk command

This article introduces the detailed explanation of the use of Linux awk command. I hope it can help everyone.

Dec 13, 2016 am 09:51 AM

awk command

Thoughts triggered by a distinct question

The data here has the following characteristics: in one DepartmentId, there may be multiple Names, and vice versa. That is to say, Name and DepartmentId have a many-to-many relationship. Now I want to implement such a query: after sorting by DepartmentID (the first step), then obtain the unique values ??of the Name column (the second step), and retain the relative order after the first step. In this example, the three values ??that should be returned are: ACB

Dec 13, 2016 am 09:45 AM

distinct

Oracle-distinct usage

The distinct keyword is used to filter out redundant duplicate records and keep only one, but it is often only used to return the number of unique records, rather than using it to return all values ??of non-duplicate records. The reason is that distinct can only be solved by double loop query, which will undoubtedly directly affect the efficiency of a website with a very large amount of data.

Dec 13, 2016 am 09:33 AM

Usage of distinct in SQL (analysis of four examples)

The distinct keyword is used to filter out redundant duplicate records and keep only one, but it is often only used to return the number of unique records, rather than using it to return all values ??of non-duplicate records. The reason is that distinct can only return its target field, but cannot return other fields. Next, I will share with you the usage of distinct in SQL through this article. Friends who need it can refer to it.

Dec 13, 2016 am 09:31 AM

distinct

Usage of distinct in SQL

Tables may contain duplicate values. This is not a problem, but sometimes you may want to just list distinct values. The keyword distinct is used to return uniquely distinct values.

Dec 13, 2016 am 09:25 AM

distinct