, which is, of course, converted to a string. Jsonarray Its usage is similar to list, if only need to return a [...] form of the string, this method is good. Use the static method Fromobject (new string[]{}) or Fromobject (list) to get an object of this class, corresponding to an array string. Add an element using Add (String) or add (index,string) Add a JSON-formatted string with Add (jsonobj) tips: Adding a lot of nesting although theoretically feasible, there is absolutely no need to be so
of concern, one is to pay attention to your data volume, if the amount of data is difficult to more than 10,000, then choose a smaller lightweight Access database can be, but if your database data volume is large, it is recommended to use SQL Server database, Because the processing power and efficiency of the data are much higher.My personal situation is to choose SQL server2008, because my data volume will be more than 10,000, I think in the future may be in 100,000 or so, so I also suggest yo
Before using shell to write scripts, sometimes not only to define a configuration file, often have a template, different environments directly replace the same template content to use, however, until then, has been used in the SED, awk, grep and so on. Suddenly one day there is a Yaml file, the inside to replace too much, sed too troublesome, with this method, do not know how much to write less regular ...Not much to pull, I give the big guy an example:Create a template to write variables direct
Innodb:the log sequence number in Ibdata files does not matchInnoDB: The log sequence number in the Ibdata file does not matchMaybe the ibdata file is corrupted.The solution is as follows:In the MY.CNY [mysqld], add # Size of each of the log file in a log group. You should set the combined size # of logs files to about 25%-100% of your buffer pool size to avoid # unneeded buffer pool flush activity on log file overwrite. however, # Note that a larger logfile size would increase the time n
teamI didn't think of it on the spot. An SQL statement does not solve the problem if you want to use the IF statement. Oh, that's so stupid.Back on the internet to find out a very close answerSelect A.team, A.win,b.lose from (SELECT COUNT (*) win, team from Fmatch where res= ' win ' Group by team) a left join (s Elect Count (*) lose, team from Fmatch where res= ' lose ' GROUP by team] B on A.team=b.team;There are still flaws, however, when the data is not displayed as Null instead of 0.There i
The first two articles describe the basics of regular expressions and some simple examples, this one will go a little deeper into the grouping of regular expressions, in. NET the expression grouping is represented by the match class.First look at a section of code:/// ///Show examples of multiple group within match/// Public voidshowstructure () {//the string to match
A deep understanding of the similarities and differences between exec and match methods in javascript
Before reading this article, read the following question:
Question 17: Read the following javascript code:Var someText = "web2.0. net2.0 ";Var pattern =/(\ w +) (\ d) \. (\ d)/g;Var outCome_exec=pattern.exe c (someText );Var outCome_matc = someText. match (pattern );What is outCome_exec [1] and outCome_matc
Source code analysis of Intent Filter match process, intentmatchMain Process
Main process: first match action, then match data, and finally match category
Sequence Chart
Simplified codepublic final int match(String action, String type, String scheme, Uri data, Set
The QT SDK contains a helpful GUI tool that allows us to do this kind of conversion and test your expression. You can open it in the following way: "Start"-> "->" Qt SDK by Nokia v2010.02.1 (open source) "->" Qtdemo "->" Tools "->" RegularExpression "Launch" can be selected to start the program, you can also "documentation" view the source file.
qregexp::qregexp (const QREGEXP Rx)/Create a regular expression that is a copy of the RXThe regular expression qregexp regexp ("Taskctll"), w
This article mainly introduces the differences between exec and match expressions in js regular expressions. If you need them, you can refer to them and hope to help you. In the past, js regular expressions were rarely used in JavaScript, that is, it is used to determine the Mail name. There are a lot of online code and there is little research.
Recently, we have encountered some issues that require regular expressions.
The regular expression object
the target component is already very clear, Android needs to parse the implicit intent, through parsing, intent mapping to the activity that can handle this intent, Intentreceiver or service.Intent Filter Matching rulesThe intent parsing mechanism is primarily to find a matching intent by locating all intentfilter in the androidmanifest.xml and the intent defined therein. During this parsing process, Android is judged by the three attributes of the action, type, and category of intent. There ca
Today when using the SQL fuzzy query contains the letter D, found that some do not include this letter is also queried:SELECT * from Custom WHERE like ' %d% 'Query for a moment, found the following instructions:(Last modified to:SELECT * from Custom WHERE like BINARY ' %d% ')Today, when I was doing a search for MySQL, I found out that when I use the select name from the contact where name is like '%a% ', the result of a name other than the name "new" is included in the search results. This
MySQL Full-text Search Fulltext match
At 3.23.23, MySQL began to support Full-text indexing and searching. Full-text indexing is an fulltext type index in MySQL. The fulltext index is used for MyISAM tables, which can be created on a CHAR, VARCHAR, or TEXT column by using ALTER table or create index at or after the CREATE table. For large databases, it is very quick to load the data into a table with no Fulltext index and then use ALTER table (or CRE
Thoroughly understand the exec and match methods in Javascript
Before reading this article, read the following question:
Question 17: Read the following JavaScript code:
VaR sometext = "Web2.0. net2.0 ";VaR pattern =/(\ W +) (\ D) \. (\ D)/g;VaR outcome_exec=pattern.exe C (sometext );VaR outcome_matc = sometext. Match (pattern );
What is outcome_exec [1] and outcome_matc [1]?
Choice A: TrueChoice B
Before reading this article, read the following question:
Question 17: Read the following JavaScript code:
VaR sometext = "Web2.0. net2.0 ";VaR pattern =/(\ W +) (\ D) \. (\ D)/g;VaR outcome_exec=pattern.exe C (sometext );VaR outcome_matc = sometext. Match (pattern );
What is outcome_exec [1] and outcome_matc [1]?
Choice A: TrueChoice B: falseChoice C: NULLChoice D: WebChoice E: Web2.0Choice F: UndefinedChoice G: net2.0
This question is said
Before reading this article, read the following question:
Question 17: Read the following JavaScript code:
VaR sometext = "Web2.0. net2.0 ";VaR pattern =/("W +) (" D) ". (" d)/g;VaR outcome_exec=pattern.exe C (sometext );VaR outcome_matc = sometext. Match (pattern );
What is outcome_exec [1] and outcome_matc [1]?
Choice A: TrueChoice B: falseChoice C: NULLChoice D: WebChoice E: Web2.0Choice F: UndefinedChoice G: net2.0
This question is said
A match is a collection of edges with no endpoints in a graph, and the maximum match is to find out how many edges the edge set has.Whether it is an arbitrary graph or a binary graph, there are the following theorems:The current match is the maximum match if and only if no augmented path exists.The augmented road is de
Regular expression lazy-match pattern:
In the greedy matching model chapter has said that human nature is greedy, hoping to get more money, status and even beauty, but there are a lot of ascetic people, as long as the basic needs of life can be met, in the regular expression also has such a matching principle, the following is introduced.
I. The concept of lazy mode:
This pattern is exactly the opposite of greedy mode, which matches as few characters
Before reading this article, please read the following question:Title 17:read The following JavaScript code:var sometext= "web2.0. net2.0";var pattern=/(\w+) (\d) \. (\d)/g;var outcome_exec=pattern.exec (Sometext);var outcome_matc=sometext.match (pattern);What is outcome_exec[1] and outcome_matc[1]?Choice A:trueChoice B:falseChoice C:nullChoice D:webChoice e:web2.0Choice f:undefinedChoice g:net2.0This problem is said to be an IT company's pen test, but also cause me to write this article today,
MySQL full-text search FULLTEXT match
Up to 3.23.23, MySQL began to support full-text indexing and searching. Full-text index is a FULLTEXT index in MySQL. FULLTEXT indexes are used for MyISAM tables. You can use alter table or create index to CREATE them on CHAR, VARCHAR, or TEXT columns at or after create table. For large databases, it is very fast to load data to a TABLE without FULLTEXT indexes and then CREATE an INDEX using alter table (or create
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