1th. Database 1.1 Database Overviewl What is a databaseThe database is the warehouse that stores the data, its essence is a file system, the data is stored in the specific format, the user can add, modify, delete and query the data in the database.l
is the 5.0 version of the character type in MySQL
String type
Bytes
Description and storage requirements
CHAR (M)
M
M is an integer between 0~255
VARCHAR (M)
M is an
An article about the performance analysis of the method of string null judgement, the experimental results have been given by the author, the conclusion is to use. Length==0 judgment is the most efficient, but the end of the article only a word,
-Frequently used commands detailed
Basic Commands
$ tcpdump//default crawl all packets of the first NIC interface
$ tcpdump–i ens33//crawl NIC ENS33 packet
$ tcpdump host 47.95.224.4// Listen for host 47.95.224.4 receive all packets sent
$tcpdump
Supports multiple input boxes! You can only support one input box because the information of multiple input boxes is not easy to save. Now, you can use the alt attribute of the input box to save the content before modification. Therefore, you can
Summary
This article discusses how to use C # To develop a simple web server application. Although we can use any programming language that supports. net, I chose C #. The code in this article is compiled using Microsoft's Visual C # compiler
By understanding the status of TCP, We Can troubleshoot and locate network or system faults.
I. TCP status
Listening: listens for connection requests from remote TCP ports.
First, the server needs to open a socket for listening, and the status is
This is just a simple WEB server written in C #. It only implements get requests for html files. Interested friends can continue to develop more functions on this basis, I learned c # From my younger brother soon. If you have any mistakes, please
This is just a simple WEB server written in C #. It only implements get requests for html files. Interested friends can continue to develop more functions on this basis, I learned c # From my younger brother soon. If you have any mistakes, please
C # No class is provided for playing audio files such as MP3. To write audio file programs such as MP3, you must use third-party controls or classes. This article uses the API function mcisendstring to compile a class for playing audio files such as
1. Automatic carousel + after the dot scrolling + mouse stay at the point of Pause + leave the dot auto carousel:
Copy Code code as follows:
2. Automatic carousel + mouse click Dot scrolling + leave dot automatic carousel:
C # No class is provided for playing audio files such as MP3. To write audio file programs such as MP3, you must use third-party controls or classes. This article uses the API function mciSendString to compile a class for playing audio files such as
Practice. It is not enough to know some knowledge. You need to practice it first. Now we have learned about the SIP protocol. Here we will share the practice process of a netizen's sip invite. I hope it will be useful to everyone.
Request sent by
Linked list is an important data structure and plays an important role in programming. In C and C ++, pointers are used to implement the linked list structure. Because pointers are not provided in Java, some people think that linked lists cannot be
Supports multiple input boxes! You can only support one input box because the information of multiple input boxes is not easy to save. Now, you can use the alt attribute of the input box to save the content before modification. Therefore, you can
C # No category for playing audio files such as MP3. You need to compile audio files such as MP3 for playing. Program Third-party controls or classes must be used. This article uses the API function mcisendstring to compile a class for playing audio
How HTTP worksWWW is an application system that uses the Internet as the transmission media. The most basic transmission unit on WWW is web pages. WWW is based on the client/server computing
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