Use explain() to view the execution plan of the mongodb query statement Similar to relational databases such as MySQL and Oracle, MongoDB calculates the optimal query plan for each query statement through the query optimizer, including selected indexes, query time, scanned records, number of scanned indexes, alternative execution plans, etc. information. This article introduces using […]
Tag: state
(StateFlow & ShareFlow) VS (Flow & LiveData)
Table of Contents data flow General process Switch thread StateFlow & ShareFlow StateFlow Build StateFlow &ShareFlow In the previous articles on Flow, collect function analysis and imitation of Flow builder to create data flow articles, we explored the simple use of flow and its simple principles. However, during the production process, we often borrow these […]
How to understand C language branches and loop statements
1. Branch statement~ Branch statements are also called conditional judgment statements, which are divided into if statements and switch statements; 1.1 What is a branch statement: A branch statement is also called a selection structure Simple example (hypothesis): If you study hard, you can get good grades and find a good job. On the other […]
[HDLBits question] Sequential Logic — Finite State Machines (III)
(Continued from 2.5Finite State Machine(II)) 2.5.24 Q3a:FSM [Exams/2014 q3fsm] Problem description Consider a finite state machine with inputs s and w. Assume that the FSM starts from a reset state called A, as shown below, the FSM remains in state A as long as s=0, and when s=1, the A state transitions to the B […]
[Lie group Lie algebra] [manif] 2D robot positioning based on fixed beacons (Error State Kalman Filter)…
demo demo operation result We consider a robot on a plane surrounded by a small number of punctual landmarks or beacons. The robot receives control actions in the form of axial and angular velocities and is able to measure the position of the beacon relative to its own reference frame. The robot pose X is […]
Real estate sales data analysis based on big data-recommended topics for computer graduation projects in 2023-2024
Author: IT Jump Valley Final Exhibition Personal profile: I have been engaged in computer professional training and teaching for a long time. I also love teaching. I am good at Java, WeChat applets, Python, Golang, Android, etc. I usually do some customized project development, code explanation, defense teaching, document writing, and also know some weight […]
Stable Diffusion: A state-of-the-art image model for text generation
Stable diffusion Generative AI technology is advancing rapidly and can now generate text and images simply from text input. Stable Diffusion is a text-to-image model that enables you to create photorealistic applications. Diffusion models are trained by learning to remove noise added to real images. This noise reduction process produces lifelike images. These models can […]
Only changing one line of statement, so many locks?
Introduction In this article, I want to talk about how MySQL locks are added. Why do I want to talk about this? Mainly because we use locks more or less in our business. After all, locks are the key to ensuring the security of our data. However, due to lack of understanding of the principle, […]
06丨Database Principle: Why is PrepareStatement better and more secure?
Students who do application development often think that the database is operated and maintained by the DBA, and it is enough that they can write SQL. There is no need to learn database principles. In fact, even writing SQL requires understanding of database principles. For example, we all know that SQL query conditions should include […]
[HDLBits question] Sequential Logic — Finite State Machines (II)
There were too many chores during the week, so I found an excuse to do some homework on the weekend. As a result, after watching the game over the weekend, the Dalian team was relegated. I was very sad and found an excuse not to do the questions. Well, it’s been a decadent week, so […]