2021-9-24 Linux operating system experiment 2: process communication

Experiment 2 of Linux operating system: process communication Title: [purpose] Further improve the ability of C programming in Linux environment, understand and be familiar with a variety of IPC mechanisms supported by Linux. As a multi task and multi process operating system, information interaction between processes is inevitable. Inter pr ...

Posted by hobeau on Fri, 24 Sep 2021 12:17:51 +0200

Mengxin image processing

Principle of image http://www.lizibuluo.com/8bit/ This website is a random drawing website, you can see a lot of small squares. These small squares are pixels. Pixels are composed of small squares of an image. These squares have a clear position and assigned color value. The color and position of the small squares determine the appearance of th ...

Posted by sovtek on Fri, 24 Sep 2021 12:05:45 +0200

[Oracle] CentOS 7.4 installation and deployment Oracle19c

[Oracle] CentOS 7.4 installation and deployment Oracle19c Project requirements         In the production environment, according to the business development and project requirements of the enterprise, the business database will be selected according to the importance of the business, and the data model and database design ...

Posted by delfa on Fri, 24 Sep 2021 11:06:27 +0200

Several common string operation functions (strlen, strcpy, strcmp, strcat, strstr, strtok, strerror, strncpy, strncmp, strncat)

We all know that C language provides us with many built-in library functions, and these library functions need to refer to their respective header files when they are used. This article is about several string related functions in < string. H >. catalogue 1.strlen() - count the number of characters in the string one point one &nbsp ...

Posted by sweyhrich on Fri, 24 Sep 2021 10:28:34 +0200

Beginners learn spring transaction processing

Transaction processing in Spring question answering 1. What is a transaction speak mysql When a transaction is proposed, a transaction refers to a group sql A collection of statements with multiple entries in the collection sql sentence It may be insert, update, select, delete or a combination. We hope these multiple sql statements can suc ...

Posted by pearllysun on Fri, 24 Sep 2021 10:17:06 +0200

Dahua design pattern - Reading Notes - technology - updating

Clue barNote barWrite a calculator programSee Appendix 1Why is movable type printing called one of the four great inventions in ancient China?As shown in Figure 1-1 1. Words can be directly replaced and maintainable.2. The completed words can be reused. 3. Words can be expanded freely 4. The characters can be arranged horizontally and vertica ...

Posted by spillage on Fri, 24 Sep 2021 02:50:31 +0200

Use the Canal ClientAdapter to synchronize the DDL and DML of Mysql to PostgreSQL

1. Description The description of each component is shown in the table below: assemblyeditionThe serverInstallation tutorialeffectcanal1.1.5canal1, canal2, canal3canal HA installation + mysql multi node automatic switchingzookeeper3.6.3canal1, canal2, canal3zookeeper fully distributed installationmysql8.0.25canal1, canal2MySQL master mast ...

Posted by jalperin on Fri, 24 Sep 2021 00:36:17 +0200

Java methods refer to beginners'introductory notes

Interface Composition With the updating of java, the composition of the interface has introduced some new content as follows. Composition of the interface Constant: public static final (this default modifier can be omitted)Abstract method: public abstract (this default modifier can also be omitted)Default method (Java8 started)Static met ...

Posted by menios on Thu, 23 Sep 2021 21:25:18 +0200

How to use Java to determine if a given number is a prime number

Concerning the definition of prime number: prime number is also called prime number. A natural number greater than 1 is called a prime number if it cannot be divided by any other natural number except 1 and itself; otherwise it is called a total number (specifying that 1 is neither a prime number nor a sum). Algorithms for generating prime num ...

Posted by phpstuck on Thu, 23 Sep 2021 21:10:41 +0200

Amazingly, how easy is Spring JdbcTemplate to write, delete, and check?

This article was intended to write about spring transactions, but JdbcTemplate-related functionality is used in most cases of transactions, so let's start with JdbcTemplate. What is JdbcTemplate? To review, the original way to operate db in java is pure jdbc. Whether every operation db needs to load database drivers, get connections, get Prep ...

Posted by buckboru on Thu, 23 Sep 2021 18:39:19 +0200