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Exercise notes Recurrence Code: index.php <?php require 'config.php'; if(isset($_REQUEST['username'])){ if(preg_match("/(?:\w*)\W*?[a-z].*(R|ELECT|OIN|NTO|HERE|NION)/i", $_REQUEST['username'])){ die("Attack detected!!!"); } } if(isset($_REQUEST['password'])){ if(preg_match( ...

1. String function length(a) gets the length of string a concat(a,b,c) splices multiple values into a string trim(a) remove the space at the beginning and end of string a replace(a,b,c) replace the b string in string a with C subString(str,index,len) intercepts the string str from the index char ...

One reflection In Python, reflection refers to manipulating the properties of an object through a string, involving the use of four built-in functions (all objects in Python, classes and objects can use the following four methods) class Teacher: def __init__(self,full_name): self.full_name =full_name t=Teacher('Egon Lin') # hasa ...

Learning objectives: master the following sql functions Digital function: format ABS mod ceil floor ground expCharacter function: upper lower char > length concat instrDate function: now date? Format date? Add DateDiff if ifnullConditional function: Numeric function First batch of digital functi ...

This series: Chapter 1: Nine analysis takes you easy to finish the installation of helm3 The second chapter: Nine analysis takes you to the public warehouse of helm3 The third chapter: Nine analysis takes you through the explosion of helm3 private warehouse easily The fourth chapter: Nine analysis takes you easy The fifth chapter: Nine analy ...

Preface MySQL is a kind of relational database, which has strong query function, high data consistency, high data security and supports secondary index. However, the performance is slightly inferior to that of non relational databases, especially for data above one million levels, which is easy to cause slow query. At this time, we need to ana ...

Environmental preparation Previous articles paved the way for MySQL master slave building: Article 1: Common settings for Binlog in MySQL Article 2: MySQL Master-Slave Synchronization-Principle-Practice Start the two mysql servers for Master and Slave with the following information: ➜ ~ docker ps -a CONTAINER ID IMAGE ...

What is mysql's master-slave replication? MySQL master-slave replication refers to the replication of data from one MySQL database server master node to one or more slave nodes.MySQL replicates asynchronously by default, so that the master server is not always accessed by the slave node to update its own data, which can be updated over a remote ...

Author: Du Kaisheng Contents: 1, Connection related 2, Long affairs 3, Metadata lock 4, Lock wait 5, Global read lock 6, Memory usage monitoring 7, Partition table 8, Database information overview 9, Tables not updated for a long time 10, Primary key, index 11, Storage engine 12, Real time load Reading tips: 1) This article involves a lar ...

Dockerfile overview   Dockerfile is the description file of the image file in docker. The straight white point is exactly what the image file is composed of step by step.  for example: you bought a hanger on Taobao, but the seller did not send you a complete hanger, but some components and a drawing. You assemble the hanger step by ...