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1, Trigger definition Oracle trigger is a segment of PL/SQL program code that is triggered when the user makes a specific operation on the object of Oracle database. Triggered events include DML operations on tables, DDL operations of users, database events, etc. 2, Trigger classification Triggers are divided into statement level triggers an ...

1. Requirements of chat program Through the previous study, we can see that the client and server can interact normally, so can we make a chat applet ourselves? Now we can define some requirements ourselves, such as: 1. After the server receives a message from the client establishment request, we need to push the message to other clients, whic ...

In android development, images are very easy to cause OOM exceptions. In most cases, images need to be compressed and displayed. This paper mainly records several common image compression methods in development 1, Mass compression Change the bit depth and transparency of the picture on the premise of maintaining the pixels (that is, erase (as ...

Code address, logger branch: https://gitee.com/lsjWeiYi/go-admin/tree/logger/ Go admin's log system looks very detailed. It really records every process of the whole process, and it runs through the whole framework. It encapsulates a lot of modules. It is strongly coupled with the log system. advantage: Rich logs are very helpful for the oper ...

explain Linux MYCAT installation configuration to realize MySQL master-slave replication + read-write separation.In this case, you have installed MySQL master-slave replication by default. Please refer to my related articles for details.Mycat has a single server and MySQL has a master server and a slave server. There are three servers in total ...

function //Basic grammar func Function name (parameter list ) (Return value list) { Function body } The naming rules of functions follow the identifier naming standard. Functions with uppercase letters can be used by this package file and other files, similar to public; Files with lowercase initials can only be used by this package, whic ...

preface I got the Nezha development board in advance. When I was excited, I began to study how to run my bare metal program, which is called operating system Unlike mcu, sbc level cpu is much more complex to run, but fortunately, in the field of system level, the division of labor of different software is clear. Our bare metal program, as the ...

String function The common system functions and built-in functions in string are not very different from those in python, and their names are also very similar **Len function: * * returns the length of the string. Unlike python's len() function, golang is utf-8 encoded, so Chinese characters will become three lengths. func main() { str : ...

Hello, friends (^ - ^) 🌹🌹🌹， I'm Yang Zhi, a dull blogger who is taking steps in the field of algorithms~ At present, it is still a pure vegetable Wang 🐶. The typical kind of food is noisy 👀， I can't do a lot of things well, I can't say a lot of things well, and I can't write questions 😅, Still working, still moving forward 👣. Becaus ...

Django template development & rewriting & using bootstrap This paper uses Django's own template system base.html Django's template system is inseparable from base Html is a template file, which is equivalent to a large framework. It is spliced through various block blocks, which is similar to vue's template. You can do it at ba ...