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. This changes the query condition.When will PHP launch a Find network request for MongoDB, when Mongocursor calls the GetNext method. For example, we perform the sort and getNext two methods based on the above code: $cursor->sort (Array (' name ' = 1));$result = $cursor->getnext (); This time the second line of code will trigger the network request for find, the content of the request, such as the binary protocol of the request to parse the data structure after the di

Explain shows how MySQL uses indexes to process SELECT statements and join tables. Can help select better indexes and write more optimized query statements. Simply put, its role is to analyze query performance.The Explain keyword is very simple to use, just put it in front of the SELECT query statement.MySQL to see if the index is used, simply look at the type types. If it is all, then the query statement iterates through all the rows and does not use

Tags: source package yum line tar.bz2 contain there's a way to summarizeBecause Linux installs a lot of software, there is no common way to find out if some software is installed. This is a summary of the following categories:1, RPM package installed, you can see with RPM-QA, if you want to find a package is installed, with Rpm-qa | grep "The name of the software or package". 1 [[emailprotected] ~] rpm -qa | grep ruby 2

Nginx is a high-performance reverse proxy server, now generally as the first layer of our website or other Web services agent, the user in the browser request first pass is the Nginx service.If the Nginx service does not start or end unexpectedly, it will affect the normal use of the Web service.Below I will be in Linux to see if Nginx started the process record, share it.Tools/Materials Linux Nginx Judging by process 1The f

Purpose: Determine if the Address book has changedAccording to: See the version constant in the Contactscontract.rawcontacts class, which is read-only and changes the value when the Address book changesMethod: The version value is corresponding to each address book data, if there are 100, then there are 100 this value, I said that the use of the inference method is this1. Get all version values, make up a string2, because the string may be very long,

Android DDMS connection to the real machine (root), with file explore to see the Data/data folder solutionThe problem is no permission, with 360 mobile phone helper or pea pod is also invisible. The easy way is to use the RE File manager (grant root permission), set data and Data/data to 777 permissionsNote: Open with the RE manager to see the default is not 777, but can read or write or not enough.The othe

play ads ha)Unresolved bug:1, that is, the database is not packaged with the APK installation files, that is, the game has no idiom, you need to click the "Add Idiom" button(click "Add Idiom", will appear to add the level (1-5), add idioms, add explanations, add source, these are to fill, PS: Which add level options, to write as "1", and must be in this level is best to add 10 idioms to see the most accurate effect)PS: About this level can be repaire

I used to easily record some important information in my notebook and don't want others to see it. How to encrypt TXT files? The notepad provided by the system cannot be encrypted. You can use LockNote, FSekrit, and other tools with built-in encryption functions to record secrets. The "Notepad" that comes with the Windows system can be regarded as a "temporary" notebook, which is a good helper for our on-demand notebook. It can have a bad place and ca

See how I step by step fall into a game Enterprise (mobile game security case) Step by step, like the devil's pace ~I don't know if there are any gifts, whether there are home pages, whether there are any excellent news, whether there are monthly reports, and whether there are any bonuses. I am very excited when I submit this kind of information for the first time (although many of them have not been submitted before ..)..~ I downloaded a game called

For more information, see I learned about javaWeb. Today I will focus on http requests. Should I review them! I. Basic http concepts 1. What is http? HTTP is short for Hyper Text Transfer Protocol. Its development is the result of cooperation between the World Wide Web Consortium and the Internet team IETF (Internet Engineering Task Force). They finally published a series of RFC, RFC 1945 defines HTTP/1.0. The most famous one is RFC 2616. RFC 2616 def

. Injection vulnerability: This loophole is now the most widely used, the damage is also a big loophole, it can be said that Microsoft's official website is also an injection of loopholes. Vulnerability Explanation: Injection vulnerability is caused by the character filter is not strictly prohibited, you can get the administrator's account password and other relevant information. Expert troubleshoot: Let me introduce how to find a loophole such as this URL http://www.xxx.com/dispbbs.asp?boardid=

incoming alias parameters, that is, go blank on both sides, and convert to lowercase Check that cache there is no, some words will be directly returned and reported a corresponding error, will not be repeated generation, because the private key and alias is one by one corresponding. The front end can be used to alert users to check or change a new alias based on this error. Called createChainKDKey to generate the corresponding key and get the returned public keyxpub Put the public key

PHP compilation and installation often see the error solution, php compilation common errors. PHP compilation installation often see error solution, php compilation common errors Thisarticleispostoncoderwall. compggmpfaconfigure: error: xslt-confignotfound.Pleasereinstall PHP compilation installation often see error solution, php compilation common errors This a

The agent is set up in the program, but does not know how to determine if the agent is actually used.In Visual Studio, you can use the following methods to view:Set the agent---set breakpoints at the instance of WebRequest in code, view the proxy property of WebRequest, and then continue to view, view [System.Net.WebProxy] View information such as addressThis is done by manually setting the Webrequest.proxy property to set the proxy;Then set the breakpoint in the next line of code.Then run the p

The highly-anticipated Ubuntu April 24 was released, as shown in the following figure. We can see that Ubuntu has received a high degree of attention only when its official website was almost paralyzed on the day of its release. I spent a few days installing and debugging 8.04 and now I have basically built my own Ubuntu system. I am not a system guru. At best, I can only be a computer enthusiast. I have never been familiar with Ubuntu. However, I hav

From an issue on stackoverflow, we can see that Java Dynamic binding and stackoverflowjava Let's take a look at a problem on stackoverflow, first go to the code 1 public class Piece{ 2 public static void main (String [] args){ 3 Piece p2 = new Knight(); 4 Knight p1 = new Knight(); 5 p1.capture(p2); 6 p2.capture(p1); 7 } 8 public void capture(){ 9 System.out.println("Capture");10 }11

Use JavaScript for more complex interactions(Li Xiaohua April 29, 2001 01:50)First, what is the frameworkThe main function of frame frames is "split" window, so that each "small window" can display different htm l files, different frameworks can interact (interact), this means that different frameworks can exchange information and data. For example, suppose you open two frames, the first frame shows the book's Directory, and the second frame shows the specific contents of the chapter.The framewo

; The relationship between the cups 14 and 24 of the contacts. A. Cup 1 discoloration and cup 4 unchanged-If the front two cups have a turn blue, the latter two cups have a blue, then 5 kinds of powder randomly take four kinds of in four cups to see the phenomenon.-If the latter two cups turn blue, then 4 kinds of powders are placed in four cups to see the phenomenon.Time mean: E = 2*2/45 + 4*43/45 = 176/45

A few tricky PHP questions. Try to see if you will fall into the trap. I have seen these questions on the German Q A, and they are very interesting. I will share with you the traps to see if you will fall into it. Question 1 $arr = array(0=>1,"aa"=>2, 3, 4);foreach($arr as $key=>$val){ print($key == "aa" ? 5 : $val);} What is the output result? If the answer is 1534, it will fall into the trap. Let's take

Original: PHP 18:data_valid_fns.php to see Regular expressionsThis chapter describes the regular expressions.Let's take a look at Data_valid_fns.php's code. Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->1PHP23functionFilled_out ($form _vars)4{5//test, each variable have a value6foreach($form _vars as$key=$value)7{8if(!isset($key)||($value=="'))9returnfalse;Ten} Onereturntrue; A} - - functionValid_e