Option is a good thing that most people really don't know how to use!
OverviewNullPoInterException, ChInese name:Null poInter exceptionNPE, also known as NPE, is one of the most common error anomalies In software systems.Long ago, the Google Guava project IntroducedOptionalNull poInter exceptionNullTo expect programmers to write code that is both neat and more readable...
Tech >>
Fuzhou Changle International Airport Comprehensive Bonded Zone approved
Renderings of Fuzhou Changle International Airport Phase II Expansion Project Provided by the Management Committee of Fuzhou (Changle) International Aviation CityRecently, the State Council approved to integrate the Fuzhou Free Trade Zone and set up a comprehensive free trade zone of Fuzhou Changle International Airport, injecting strong impetus into the "take-off" of Fuzhou (Changle) International Airport City with Changle International Airport as its core.Fuzhou Changle International Airport Comprehensive Bonded Zone is the sixth approved comprehensive bonded zone and the first airport comprehensive bonded zone in Fujian Province, with a planned total land area of 1...
Tech >>
IQiyi has been criticized for being on the hot search again
Everyone said,The purpose of technological innovation is to promote social progressThen provide better services for people, such as reducing usage barriers, costs, and so on.butThe innovation and evolution of television is definitely an exception...
Tech >>
New Technical Director: Discovered who is using delete to delete data and directly fired!
delete Mysql MySQL delete MySQL MySQL MySQL MySQL MySQL InnoDBMyISAMMemory BMySQL MySQL 16KBMySQL MySQL B B MySQL MySQL MySQL ACID MySQL MySQL MySQL MySQL deletetruncatedrop drop > truncate >> DELETEDELETEDELETE from TABLE_NAME where xxxDELETE DMLtrigger InnoDB DELETEmysql delete ** DELETErollback segementcommit;delete from table_name,MyISAM InnoDB ;delete from table_name where xxx , InnoDBMyISAM;delete optimize table table_name InnoDBMyISAM deleteoptimize table SQLMcsjdemodemo2select concat(round(sum(DATA_LENGTH/1024/1024),2),'M') as table_size from information_schema.tables where table_schema='csjdemo' AND table_name='demo2';Sizeoptimize table demo2sizedelete redoundo rollback) dropDrop table TablenameDDLTruncate drop table table_name InnoDB MyISAM; drop (constrain)(trigger)(index); /, invalid drop deletetruncatedroptruncateDDL rollback segment trigger truncate table table_name InnoDBMyISAM truncate tabledrop table creat,create table drop table;truncate auto_incrementMyISAMtruncateauto_increment1deleteauto_incrementInnoDBtruncateauto_increment1deleteauto_incrementdeleteMySQLauto_increment1InnoDB auto_incrementdelete auto_increment1auto_increment SELECT 1+MAX(ai_col) FROM t truncateDELETE DELETEDELETEInnoDBdeletedeleteInnoDBInnoDBtablespace > segmentinode > Extent >PageInnodbsegmentextentsegmentFREE_PAGE32page32page1extent1extent32MBextent32MB4extentMySQLdata pageMySQL CrashInnodbInnoDBUndo****MySQLinformation_schema****innodb_file_per_table=1table_name...
Tech >>
Interview with President Jin Li of Fudan University: Both scientific research and education in universities should embrace AI
Reporter Sun Bing from China Economic Weekly | Beijing ReportWhile the public is still actively discussing how the AI big model will change university education and scientific research, Fudan University has already arranged a "magic tool" for all teachers and students in the school.On June 27th, the largest cloud based research and intelligent computing platform (CFFF) for domestic universities was officially launched at Fudan University...
Tech >>
Attention to those who pay with WeChat Pay! There is a big difference between 'I sweep you' and 'you sweep me'. Don't make any mistakes again
In the digital age, especially mobile payments such as WeChat have become commonly used payment methods in our daily lives. It has brought us a lot of convenience, but there are also some risks and hidden dangers...
Tech >>
How powerful is the Baihetan Dam that China spent 180 billion yuan to build? Fill West Lake with water in 6 minutes
Before reading this article, please click on "Follow" to facilitate your discussion and sharing, as well as bring you a different sense of participation. Thank you for your support...
Tech >>
The sales of air frying pan dropped precipitously, with several major shortcomings outstanding. Is there a way out for small household appliances?
followThe air frying pan was all the rage for a time, and was once called the "God frying pan" by frying lovers. However, the air frying pan, which has sprung up like mushrooms, has suffered Waterloo this year...
Tech >>
Why are people who set up floor stalls most afraid of others putting their phones on scales? Thanks to colleagues sharing secrets!
Why are people who set up floor stalls most afraid of others putting their phones on scales? Thanks to colleagues sharing secrets! As the weather gradually turns hot, many friends have noticed that there are more and more street vendors outside, especially fruits and vegetables. As these small vendors sell in large quantities, the items on the street vendors are much cheaper than those in the store...
Tech >>
New low in history! How does a TV set that won't move for 200 yuan lose the hearts of consumers?
Before reading this article, we sincerely invite you to click on itFollowIt not only facilitates your discussion and sharing, but also brings you a different sense of participation. Thank you for your support...
Tech >>
Tencent, who has been struggling for 8 years and has a lot of money, cannot resist it
The 'false fire' of the ear economy is cooling down again.Author | Peach CrispSource | Tiantian Finance 116For those who enjoy listening to books, your ears will be missing another 'old friend'...
Tech >>
Can't even watch the news broadcast without paying? The People's Daily has released an article revealing the cover up of television manufacturers
followThe morning is a deerEditor | Morning is a deerDecades ago, television was still a novelty, and many families couldn't afford it. Therefore, once someone had a television, the entire village would gather and move to the yard to watch it together...
Tech >>