Programmer Think

Quick Start for PyQt5 (8) PyQt5 database operations 1. SQLite database 1. Introduction to SQLite SQLite is a lightweight database that implements a self-contained, server-free, zero-configuration, transactional SQL database engine, mainly used as a database for mobile applications and small desktop applications.Official website:https://www.sql ...

1. What is BeanPostProcessor?When does it trigger?What can I do with it? 1. What is it? First it is an interface that defines two methods: public interface BeanPostProcessor { @Nullable //Trigger this method before all bean s are initialized default Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansExcept ...

The positioning of this series is to study XTTS and related technologies in depth. As the beginning of this series, in line with the principle of practicality, I first refine and simplify the actual implementation plan of U2L migration in an actual production environment, aiming at clearly explaining how to use XTTS as a solution for U2L migrat ...

Subquery Subqueries refer to SELECT clauses that appear in other SQL statements. For example: SELECT * FROM t1 WHERE col1 = (SELECT col2 FROM t2); Among them, SELECT * FROM t1 is called Outer Query/ Outer Statement (that is, the outer query) SELECT col2 FROM t2, called SubQuery Subqueries are nested w ...

The anti-pickpocket mechanism of Taobao is much higher than that of other websites. Let's first talk about the problems I encounter in data acquisition. First of all, when I started with the request, I found that when the right-click open source code, the web page information could not be found at ...

Originality: Yang Taotao MySQL has always supported regular matching, but regular substitution was not supported until MySQL 8.0. For such scenarios, it used to be either processed on MySQL or processed on Application side. For example, I want to replace the substring of the third action in the column str1 of table y1 with dble. 1. Write you ...

Preface Anyone who can read this article must know the power and benefits of the separation of reading and writing from the database, so let's cut the crap and get right to the point. For convenience, you can configure database remote connection privileges first use mysql ; update user set host = '% ...

If you want to modify the storage engine of MySQL database, you must understand the two engines, and clearly understand the difference between the two engines. MySQL database supports two common storage engines: InnoDB engine: Provides support for database ACID transactions, and implements four isolation levels of the SQL standard. The engine ...

affair Transaction actually refers to a set of operations that contain many single logic. As long as one logic fails to execute successfully, it fails. All data is returned to its original state (rollback) Why do we have business? To ensure the success of logic. Example: Bank transfer. Demonstrate transactions using the command line. Op ...

The basic introduction and basic usage of nmap have been submitted in the dark cloud knowledge base, and the details are more detailed, which will not be described in this article. Specific links: /tips/?id=2002 This article mainly explains the use of many scripts of nmap, especially when penetrating the intranet. 0x01 nmap Scanning by Script ...