Found a total of 4858 related content
MySQL transaction practices: In what situations should transactions be used?
Article Introduction:MySQL transaction practices: In what situations should transactions be used? In database management, a transaction is a set of SQL statements that either execute successfully together or fail together as a single unit of work. MySQL supports transaction operations, which can ensure the data integrity and consistency of the database. In many cases, using transactions can effectively manage database operations and avoid data anomalies or inconsistencies. Under what circumstances should transactions be used? The following are some common situations: Database update operations: When there are many
2024-03-02
comment
255
Why do events fail to bubble up?
Article Introduction:Why don't events bubble up in some cases? Event bubbling means that when an event on an element is triggered, the event will propagate upward from the innermost element until it is passed to the outermost element. But in some cases, the event cannot bubble, that is, the event will only be processed on the triggered element and will not be passed to other elements. This article will introduce some common situations, discuss why events fail to bubble, and provide specific code examples. Use the event capture pattern: Event capture is another way of event delivery, as opposed to event bubbling.
2024-01-13
comment 0
480
When to use event capture
Article Introduction:The situations where event capture is used include that the position of the target element is not fixed, events need to be preprocessed in advance, custom event delegation is required, and asynchronously loaded elements are processed, etc. Detailed introduction: 1. The position of the target element is not fixed. When the position of the target element is not fixed, the event cannot be processed through event bubbling, because the event bubbling is passed upward from the target element. If the position of the target element is not fixed, , the event handler cannot be accurately triggered; 2. The event needs to be preprocessed in advance, and sometimes some preprocessing operations need to be performed before the event is passed to the target element, etc.
2023-11-01
comment 0
935
MySQL transaction application guide: 5 situations where transactions are most suitable
Article Introduction:MySQL Transaction Application Guide: 5 situations in which transactions are most suitable, specific code examples are required. In the field of database management, transaction processing is an important technical means that can ensure the consistency, integrity and reliability of database operations. As a popular relational database management system, MySQL also provides powerful transaction support. In practical applications, rational use of transactions can effectively ensure the accuracy and reliability of data. This article will introduce the basic concepts of MySQL transactions and the 5 typical situations where they are best used
2024-03-01
comment 0
412
What are the exceptions for events that cannot bubble?
Article Introduction:Exceptions to bubbling events: What events cannot bubble? In most cases, events in web pages can be delivered and processed through the bubbling mechanism. However, in some cases, some special events cannot be bubbled. This article will introduce some common events that cannot be bubbled and provide code examples to help readers better understand. focus and blur events: These two events involve changes in the focus of an element. When an element gains focus, the focus event is triggered; when the element loses focus, the blur event is triggered.
2024-01-13
comment
376
Why do events bubble up and trigger multiple times?
Article Introduction:Why is the event bubbling triggered twice? Event bubbling is a common phenomenon in web development. It means that when an event on an element is triggered, the event will bubble up from the element, triggering the same event on its parent element in turn. However, sometimes we find that an event is triggered twice during the bubbling process. In order to better understand why this happens, we need to start with the principle of event bubbling and analyze it with specific code examples. The principle of event bubbling is based on the DOM tree structure. In a
2024-02-19
comment
286
Undecided event book Love Mu Secret Invitation event is reprinted for a limited time: Love lingers in the shadow, and the mist creates fragrance
Article Introduction:The undecided event book will open a limited-time rerun of the Love Mu Secret Invitation event at 11:00 noon on February 27. During the event, players can obtain shaving equipment by consuming unnamed chips or going to the mall to purchase gift packs. Open the grid at random and reveal the Love Mu Secret. Invite MR Thoughts to be reproduced. After the event, unused event props will be returned in proportion. The Undecided Event Book's Secret Invitation Event will be reproduced for a limited time: the shadow of love and the mist create fragrance. The shadow of love and mist create fragrance. At 11:00 on February 27, 2024, the "Secret Invitation to Love" event will be resumed for a limited time! The "Secret Invitation to Love" event is a limited-time rerun ▶ Event time: 11:00 on February 27, 2024 - 04:00 on March 3. During the event, lawyers can consume [Unnamed Chips] or go to the "Mall" to purchase the event The [Shaving Tools] obtained from the gift pack come with
2024-02-25
comment 0
401
What are the limiting conditions for event bubbling?
Article Introduction:Event bubbling is a JavaScript event handling mechanism that allows a nested element to pass the event to its parent element when an event is triggered, and the parent element triggers the event in turn. The restrictions on event bubbling mainly include the following aspects. First of all, event bubbling is the transfer from child elements to parent elements, but not all events support bubbling. Only certain event types, such as mouse events, keyboard events, and HTML form events, support event bubbling. Other event types such as focus events and scroll events
2024-01-13
comment 0
587
List of limited-time reissue contents of 'Undecided Event Book' Love Mu Secret Invitation Event
Article Introduction:The "Undecided Event Book" event will start at 11 noon on February 27th. During the event, players can randomly open the shaving equipment grid by consuming business cards or purchasing gift packs at the mall, and invite Qingmu to copy MR ideas. After the event, unused event props will be returned proportionally. Next, the editor will give you a detailed introduction to this event. The Undecided Event Book's Secret Invitation Event will be reproduced for a limited time: the shadow of love and the mist create fragrance. The shadow of love and mist create fragrance. At 11:00 on February 27, 2024, the "Secret Invitation to Love" event will be resumed for a limited time! The "Secret Invitation to Love" event is a limited-time reissue. Event time: 11:00 on February 27, 2024 - 04:00 on March 3. During the event, lawyers can purchase activities by consuming [Unnamed Chips] or going to the "Mall"
2024-02-29
comment 0
454
10 fun things you can do with just a few lines of JavaScript
Article Introduction:In this tutorial, let's discuss some interesting things you can do with a few lines of Javascript. Almost every website uses JavaScript. JavaScript was born in 1995. It is a programming language similar to other languages, but it runs faster because it does not have many predefined functions. JavaScript can create programs, libraries, and scripts for websites or desktop applications. Many web developers are also good at writing JavaScript. Some JavaScript codes can be interesting if you observe the way they behave. Let’s discuss what these fascinating things are in JavaScript. Interesting things about semicolons in programming languages
2023-09-15
comment 0
876
'Book of Undecided Events' Happy birthday to Zuo Ran, spring is just in time, I miss you so much
Article Introduction:In April, the forest flowers are blooming, and the spring breeze is full of tenderness. Today is the birthday of Zuo Ran from "Book of Undetermined Events". Previously, "Undecided Event Book" launched a "Spring Ran Ran" themed birthday event to celebrate Zuo Ran's birthday. In the game, players match Zuo Ran's clothes and spend a sweet and romantic date with Zuo Ran. Outside of the game, many players sent blessings to Zuo Ran on his birthday through various fan works. Thousands of mountains are like wading, and it will live up to the passage of time. Good wishes, deep love, stay together every day and morning. Multiple birthday-limited benefits are unlocked. Flowers bloom in the dream of Shao Nian and "Spring is Ranran" Zuo Ran's birthday series event is coming to an end. Exciting event plots and multiple birthday rewards are unlocked today. Starting from April 26, the limited plot of "Spring" will be unlocked. Completing birthday limited time tasks will also get birthday limited invitations [Regret], R Thoughts [
2024-04-26
comment 0
385
Why can't I access the Internet but can log in to WeChat in Win11? Details
Article Introduction:Why can't I access the Internet but can log in to WeChat in Win11? For details, I believe that many users have encountered the situation that their computers cannot access the Internet but can log in to WeChat. So let this site carefully introduce to users the analysis of the problem that Win11 cannot access the Internet but can log in to WeChat. Analysis of the problem that win11 cannot access the Internet but can access WeChat
2024-01-31
comment
912
Love and Producer 2024 Lantern Festival welfare information: Flowers are blooming and the moon is full, everything is happy
Article Introduction:The Lantern Festival is coming soon, and the producers of Love and Love have also updated the Lantern Festival benefits. There are three benefits in total, including heartfelt gifts, special text messages, and greetings from him. Players can receive special Lantern Festival-themed text messages from him. You can also receive his Lantern Festival greetings, which I believe everyone is looking forward to. Love and Producer 2024 Lantern Festival welfare information: Flowers are blooming, the moon is full, and everything is happy. From 18:00 on February 24th to 23:59 on February 25th, you can check the in-game mailbox to receive the [Diamonds*100] given by the five characters. ], a total of [Diamonds*500] Lantern Festival gifts. Special SMS From 18:00 on February 24th to 23:59 on February 25th, log in to the game and receive Lantern Festival-themed [Special SMS] from five characters on your phone.
2024-02-24
comment
810
5 things you still can't do on your MacBook Pro
Article Introduction:More than 200 days have passed since Apple launched its redesigned MacBook Pro series. Available in 14-inch and 16-inch display sizes, the new-look MacBook wows Apple fans and creative professionals with its powerful custom Apple chip, mini-LED screen, and multiple connectivity options. But there are still some things that the MacBook Pro can't do. Here are five features some Mac users are still waiting for. 1. Support for 120Hz 4K displays Five years after removing the HDMI port on the MacBook Pro, Apple will replace the commonly used multimedia interface in 2021
2023-04-24
comment 0
1199
PHP command line errors: things you may not know
Article Introduction:This article will cover some things you may not know about PHP command line errors. As a popular server-side language, PHP generally runs on a Web server, but it can also be run directly on the command line. For example, under Linux or MacOS systems, we can enter the "php" command in the terminal to run PHP directly. script. However, just like in web servers, when we run PHP scripts in the command line, we also encounter some errors. Here are some things you may not know about PHP commands
2023-05-11
comment 0
1040
Summarize some things that Uniapp can do that H5 cannot do
Article Introduction:With the continuous development of mobile Internet technology, there are more and more applications based on H5 technology, but some problems will still be encountered in actual development, such as poor compatibility, performance issues, etc. In order to solve these problems, a new cross-platform development framework-Uniapp has emerged in recent years. Uniapp is a cross-platform development framework extended based on the Vue.js framework. It can develop multiple platforms (including H5, mini programs, apps, etc.) at the same time, effectively improving development efficiency. Moreover, Uniapp can also do some things that H5 cannot do. Next
2023-04-06
comment 0
460
Ant Manor January 18: People often use the word 'smashing the pot' to describe things that don't get done. Guess which industry it originated from?
Article Introduction:Ant Manor’s question on January 18: People often use “smashing the pot” to describe things that don’t get done. Guess which industry it originated from? Many friends don’t know which industry first originated from the common use of “smashing the pot” to describe things not getting done. So below, the editor will bring you the answer to Ant Manor’s daily question on January 18. If you are interested, come and find out. Just give it a try. Summary of Ant Manor's answers today Ant Manor January 18: People often use "smashing the pot" to describe things that are not done. Guess which industry problem it originated from: People often use "smashing the pot" to describe things that are not done. Guess the origin Which industry? Answer: Opera Answer analysis: 1. At the end of the Qing Dynasty and the beginning of the Republic of China, Peking Opera in the north once performed on the same stage as Shanxi Bangzi and Zhili Bangzi (now Hebei Bangzi), but the repertoire and performances remained the same.
2024-02-23
comment
152
'Lin Di Que' Song Ci plot guide details
Article Introduction:Lin Di Que is an antique palace role-playing game. The guide for male plot concubines includes special blue faces of the non-plot family, special male plot concubines, some plot ministers, male plot concubines, etc. Song Ci is a special male plot concubine, so Lin Di Que How to conquer Song Ci? Next, I bring you the details of the Song Ci plot guide for "Lin Di Que", let's take a look together! "Lin Di Que" Song Ci Plot Guide Details Song Ci (Special Male Plot Concubine) 1. Yangxin Hall → Affairs → Summon Song Ci → Choose Linxing after your favor reaches 501. 2. Song Ci cannot enter the harem or get pregnant. 3. Clan relatives can only be requested once a year. There is an upper limit for the number of clan relatives who can enter the palace in each plot concubine. The maximum is five. When the upper limit is reached, no more clan relatives will enter the palace. [Song Ci 501, why is it still not possible?] Answer: You need to go to the Ministry of Industry
2024-02-22
comment 0
707
What happens to the current MySQL transaction if the session ends mid-transaction?
Article Introduction:It is assumed that if the session ends in a transaction, the current MySQL transaction will be rolled back by MySQL and ended. This means that all database changes made in the current transaction will be deleted. The end of the session is called an implicit rollback. Example Suppose we have the following values in table "marks" mysql>Select*frommarks;+------+----------+-----------+-- -----+|Id |Name |Subject |Marks|+------+---------+-----------
2023-08-25
comment 0
1103