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(); { "IsMaster": false, "Maxbsonobjectsize": 16777216, "maxmessagesizebytes": 48000000, " Maxwritebatchsize ": +, " localtime ": Isodate (" 2015-09-23t07:49:32.934z "), " Maxwireversion ": 3, " Minwireversion ": 0, " OK ": 1 } > bye Iv. Verification1. Data synchronization1) Master:$ MONGO MongoDB shell version:3.0.6 connecting to:test > Use AAA; Switched to DB

this method in each class in theForObjectClass ofequals ()method, it is the judgment callequals ()The reference to the method and the incoming citationUse consistency, that is, whether the two references point to the same object. ForObjectClass ofequals ()Partymethod, it is equivalent to==。A .ForStringClass ofequals ()method, it is the content that determines the current string and the string passed inare consistent.25. For the equality judgment of a String object, use the Equals () method inst

Install vsftpd in ftp service, Nfs service, and Nis service ftp service: yuminstallvsftpd *-y view vsftdd installation: getsebool amp; ndash; tl | grepftp anonymous user vietcvsftpdvsftpdconf No. anon_mkdir_wri ftp service, Nfs service, and Nis service ftp service install vsftpd service: # yum install vsftpd *-y view vsftdd installation: # getsebool-tl | grep ftp anonymous user # vi/etc/vsftpd. conf to # anon_mkdir_write_enable = YES and then add anon_other_write_enable = YES # anon_upload_enab

.button1click (Sender:tobject);varJ:tjsonobject;beginJ: = Tjsonobject.create; J.addpair (' AA ',' 111 '); J.addpair (' BB ',' 222 ');//Output stringMemo1.text: = j.tostring;//Result: {"AA": "111", "BB": "222"}{ToJSON is the same as ToString, but should try to use ToString instead of ToJSON, because ToJSON is also calling ToString and reallocating memory}J.free;End;//tjsonarrayprocedureTform1.button2click (Sender:tobject);varA:tjsonarray;beginA: = Tjsonarray.create; A.add (1);//tjsonarray is not

css3-Box ModelBox Model Properties :Width widthsHeight altitudemargin outer marginBorder borderpadding inner margintest{width:200px; height:100px; margin:20px; padding:15px; border:5px solid #f00;}Standard mode, HTML header with document type declaration: Element actual width =width + padding-left + padding-right + border-left-width + border-right-widthelement actual height =heigth + padding-top +padding-bottom + border-top-width + border-bottom-widthPromiscuous (weird) mode: Document type decla

The two look very much alike.Functions declaration: Function Function name () {}Functional Expressions: Function name (writable and not writable) () {}: Named function expression/anonymous function expressionFor a few examples:function aaa () {}: Functions declarationvar a=function aaa () {}: named function expressionvar a = function () {}: an anonymous function expression;(function

red. Because the number of bytes returned by the first query exceeds max_length_for_sort_data, the sorting adopts regular sorting. in this case, MYSQL sorts rowid and converts random IO to sequential IO, therefore, the return value is 5 before and 6 after, while the second query uses optimized sorting, without the second data retrieval process, keeping the relative position of the record after sorting. If you want to optimize the sorting of the first statement, set max_length_for_sort_data to a

) if the object is created with new, The Destructor is automatically called when you delete it. Syntax: no return type, no parameter, function name is added before class name "~ " Code: class X { public: X() { } ~X() { } }; Note: 1. Why should I define a destructor as a virtual function?Because: virtual functions are designed to support polymorphism ,... Add later Problems encountered # Include Using namespace std; class

First of all declare: Database master Please go away, you saw an eyesore ah. Sometimes when the query, Ah, a field in, and not in simply can not meet the requirements, very much like more than one field in the, not in, but many databases do not support more than one field in the, not in (DB2 is supported), it is estimated that many friends are depressed bar! But it doesn't matter, I do not write the article, hehe. I used the database has Access,sql server,db2, laughed at AH. In fact also on th

Command operations for Linux1. Daily Operation Command* * View your current working directoryPwd* * Time to view current systemDate* * See who is online (who logged in to the server)Who view current onlineLast view recent log in history2. File System operation**LS/view child nodes (folders and files) information in the root directoryLs-al-a is show hidden file-L is displayed in a more detailed list form* * Switch DirectoriesCd/home* * Create Foldermkdir AAA