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space being inserted into the qlineedit.If the target control is not qlineedit, or the key is not a spacebar, we will pass the event to the EventFilter () function of the base class.QT provides 5 levels of event processing and filtering:1, re-implement the event function. For example: Mousepressevent (), Keypress-event (), PaintEvent ().This is the most common method of event handling.2, re-implement Qobject::event ().This is typically used when QT d

To develop an application, the importance of logging is self-evident. However, it is sometimes found that a large number of garbage logs appear in the log. The so-called spam logs are logs that you do not need to know, or the logs are not useful for viewing or tracking apps. It is also (but not only) that the common log framework sets the log level for these issues. But when writing a program, which of these log levels to choose, does not have a unifo

lock for INSERT, UPDATE, delete is also releasedAlthough deadlock cannot be avoided in this way, the two-segment locking protocol ensures that concurrent scheduling of transactions is serialized (serialization is important, especially when data recovery and backup). Lock mode in a transactionFour isolation levels for transactionsin the database operation, the transaction isolation level is proposed in order to effectively guarantee the correctness o

2 transaction isolation levels supported by Oracle Read committed and Serializable The Read committed is the default isolation level. Isolation levels (Isolation level) The isolation level defines the degree of isolation between transactions and transactions. The isolation level and concurrency are contradictory: the higher the degree of isolation, the worse the concurrency of the database, and the lower

Tags: mysql four kinds of transaction isolation mechanismThe MySQL standard defines 4 isolation levels that define which changes within and outside a transaction are visible and which are not.Low isolation levels generally support higher concurrency and lower system overhead.Isolation levels from low to High: READ UNCOMMITTED First: READ UNCOMMITTED (read UNCOMMI

In many cases, PHP files may encounter some very difficult-to-troubleshoot errors, such as output of large white pages. It is possible that the PHP error level shields some non-fatal errors, resulting in no error prompt. Therefore, understanding and familiarity with PHP error levels may become a new method for debugging errors.Php. by default, the PHP Error Reporting level is E_NOTICE, and E_ALL indicates reporting all non-fatal errors, because these

Differences between the levels of integrated wiring systems In general, the levels of Integrated cabling systems are divided into three types: integrated, enhanced, and basic. So what are the differences between the three types? Level 1: Comprehensive The integrated architecture is suitable for scenarios with high configuration standards in the Integrated Wiring System. It uses optical fiber cables and co

[Switch] from the perspective of the framework, five levels of PHP and their respective salary and treatment, five types of salary. [Switch] looking at the five levels of PHP and their respective salary and treatment from the framework, I accidentally saw this article and was somewhat touched. I started my blog and used it to motivate myself. In the original article, [transfer] The framework shows the five

The chrome version of Angry Birds has been upgraded! This new version of 1.2.0 adds checkpoints designed for Christmas and the highly destructive mighty eagle on the iOS platform. Including: For 42 levels, you can use mighty eagle to play the game again. You need to pay $0.99. There are 25 season's greedings levels, and only one level can be played every day until the last level is displayed on Jan

SQL server lock mechanism (I)-Overview (lock types and ranges) SQL SERVER lock mechanism (II)-Overview (Lock compatibility and lockable resources) This article introduces the locking mechanism of SQL SERVER (iii) -- Overview (lock and transaction isolation level) Vi. Impact of various transaction isolation levels Users who modify data will affect other users who read or modify the same data at the same time. That is, these users can access data con

During the interview, you may often ask "what do you want to do in the next five years ?", This may be a difficult question to answer. In China, the answer may generally be team leader, Manager, ect, specialist, etc. In China, you may think that manager will be the programmer's next goal, but abroad, managers and programmers may be two different branches. The superior ect or specialist is better than the manager, because these people have higher IQ requirements. There was such an article on the

Cocos2d-x 3.2 Monopoly game project development-Part 5 standalone game-levels choose ScrollView, monopoly Standalone Click MenuScene. cpp to call Director: getInstance ()-> pushScene (MapChooseScene: createScene ()); Go to the level selection interface. We use the ScrollView control to create this interface. Because the position of the scrollview is relatively random after being dragged, I think it is to drag it to the second image to display the

1. Runs 64-bit registers and is compatible with the armv7 architecture software. That is, it supports both 32bit and 64bit, aarch64 aarch32 2. the privilege and mode are separated, and armv7 is integrated. In armv8, there are pl3, PL1, pl0, and no pl2 in the security status, and the safe memory space can be accessed. In the unsafe state, there are pl2, PL1, pl0, and no pl3, and the safe memory space is not accessible. Each PL level determines a set of commands and registers. 3. Exception

sea of ridicule in front of the leadership, and dress yourself as a technical master. It is really difficult to introduce the confused office culture into the technical department! Level 10: I am a dumb or dumb. If I write a SELECT statement, I will say that I am proficient in oralce. If I don't even know a few registers, I will say that I understand Assembly. I suggest sending all the registers to Japan as IT industry workers, earning money from the Japanese is also a serious blow to the Ja

Introduction: This tutorial is mainly for beginners, and the author explains how to use channels to handle the color levels and sharpness of pictures through examples. A friend sent me a picture and asked me how to get the color levels back and do a little bit sharper. Open the picture a look, sure enough color level is very weak, the petals are not clear. But this kind of picture has the same feature: it

Staff often need to analyze and summarize large amounts of data stored in Excel to discover trends and implications of data. For example, in the Sales Performance table shown in Figure 1, how do you quickly show how each employee's sales compare in 1 ~ March? Figure 1 Sales Performance table The "Levels" feature of Microsoft Office Excel 2007 enables you to quickly understand the distribution trend of your sales data by taking advantage of co

transaction read data that was not committed by another transaction. (There is a lot of potential for concurrent processing of the system) 2. Non-repeatable reading Within the same transaction, when reading the same data multiple times, the data was found to have been modified by another committed transaction. (data that is read two times within a transaction is not the same.) ） 3. Phantom Reading A transaction executes a query based on the same query criteria, and the returned record contains

Label:Access levels Modifier Class Package Subclass World Public Y Y Y Y Protected Y Y Y N No modifier Y Y N N Private Y N N N The following table shows where the members of the Alpha class is visible for each of the access modifiers that can