Programmer Think

🏷️ The current chapter is [MySQL basics] 07: view 🤖 🏷️ More: MySQL basic tutorial , take you to start MySQL database on a zero basis! 💪 🏷️ Welcome to praise 👍 Collection 🌟 Attention ❤️ Leaving a message. ✍️ Concept of view A virtual table composed of data queried by one or more tables in a database according to specific cond ...

Simply understand the selection of synchronized code block lock object 1. Readme Let me briefly explain my understanding: The selection of this lock object should meet one of the most basic conditions: uniqueness. We can imagine that the function of this lock is to lock resources (that is, lock the data information operated by the curre ...

preface In the last article, the core technology of lexical analysis, finite automata (DFA), and the use and working principle of two common lexical analyzers were introduced. On this basis, it will be much easier to see the lexical analysis source code of Go This paper mainly includes the following contents: Go compiled entry file and what ...

Python is one of the top programming languages. It has many hidden functions that many programmers have never used. In this article, I'll share 13 Python features you may never have used. Don't waste time, let's start. Click here to run the code 1. Data retrieval by step Knowledge points: list[start:stop:step] Start: start indexing. The de ...

matches() of the String class uses The matches() method is a global match. If regular can match the whole string, it returns true; otherwise, it returns false String value4 = "11111111112"; if (value4.matches("\\d+")) { System.out.println("matches Match successful"); }else{ System.out.println("ma ...

Multithreading tutorial (VII) monitor concept 1, Java object header java objects are usually composed of two parts in memory, one is the object header, and the other is the member variables in the object. Take the 32-bit virtual machine as an example, the object header is as follows: (1) Common object |------------------------------------- ...

Although most of my work is Java related development, I am exposed to Linux system every day, especially after using Mac. I work in the command line environment with black background every day I don't have a good memory. I can't remember many useful linux commands very well. Now I'll summarize them gradually for later viewing.basic operation Li ...

Sometimes we have such a demand: We define a Python method. The method receives some parameters, but we want to expose these parameters on the command line when calling. For example, here is a crawling method: import requests def scrape(url, timeout=10): response = requests.get(url, timeout=timeout) print(response.text) Here, a sc ...

Hello, I'm fried fish.Go1. Generics in 18 is a hot topic, although I have written many articles on the design and thinking of generics before. However, because the proposal for generics had not been finalized before, a complete introduction was not written.Now it has basically taken shape. Fried fish will take you to find out the Go generics. T ...

Reading harvest 👍🏻 Learn to customize spring boot starter👍🏻 Understand the principle of SpringBoot auto configuration Download the source code of this chapter ❤️Development starter❤️Test starter What is Starter Starter is a very important concept in Spring Boot. Starter is equivalent to a module. It can integrate the dependencies require ...