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1, Overview of relational database and non relational database 1. Relational database Relational database is a structured database, which is created on the basis of relational model (two-dimensional table model) and is generally record oriented. SQL statement (standard data query language) is a language based on relational database, whic ...

1, Use Dongtai Iast to detect S2-001 vulnerability 1. Start the online shooting range Log in to the online shooting range: http://labs.iast.huoxian.cn:8081 , start the 'S2-001' environment. After waiting for the environment to start, click the * * access range * * button to go to the range environment. This environment comes from 'vulhub' and ...

iterator Iteration is one of the most powerful functions of python and a way to access collection elementsAn iteration is an object that can remember the traversal positionThe object of the iterator is accessed from the first object of the collection until the access is over, and the iterator only moves forwardThe basic methods of iterators: ...

1, Overview of classes Handle (spatial pointer) Object (storage space) Transaction t1, t2;//Declare handle t1, t2 t1 = new();//Instantiate the object and assign its handle to t1 t2 = t1;//Assign the value of t1 to t2, that is, t1 and t2 point to the same object t1 = new();//Instantiate the second object and give its handle to t1 //At thi ...

1 installation Download the compressed package on the official website of Redis: Use Xftp to put the Redis compressed package in the / opt directory and use the command: tar -zxvf Redis-6.2.2 tar. GZ decompression. Because Redis is implemented based on C + +, it needs to rely on two additional packages: GCC and gcc-c + +. Use the commands ...

In the concurrent environment, in order to ensure the thread safety of sharing variable data, we need to use the locking mechanism. If the lock is not used properly, it may cause deadlock, thread starvation and other problems. If a deadlock occurs in a Java application, the program cannot be recovered automatically, which will seriously cause ...

Tired of being tossed by vue routing parameters, summarize your experience and dedicate it to the students who use vue routing parameters for the first time. If you don't understand anything, you can leave me a message. This article demonstrates the environment: vue version 2.6 and vue element admin framework 1. Pass parameters through name/pa ...

Introduction and comparison of a common redis client Jedis api online web address: http://tool.oschina.net/uploads/apidocs/redis/clients/jedis/Jedis.html Redisson website address: https://redisson.org/ redisson git project address: https://github.com/redisson/redisson Letuce website address: https://lettuce.io/ Letuce git project ad ...

Copyright notice: This article is the original article of shining sun and follows the CC 4.0 BY-SA copyright agreement. For reprint, please attach the source link of the original text and this notice. Original link: https://blog.csdn.net/qq_16804847/article/details/116116965OP 1.AOP 1.1 AOP case introduction 1.1.1 database transaction descri ...

Original address: https://circuitdigest.com/microcontroller-projects/automatic-door-opener-project-using-arduino Automatic door opener using Arduino ARDUINO Pass by** Saddam **July 12, 2015 96 You must have seen automatic door openers in shopping malls and other commercial buildings. When someone approaches the entrance, they open the door ...