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can see if we have an index created on a collection and which indexes are created to facilitate our management. Grammar: >db.collection.getindexes () 3. Create a single-column indexWe create an index on a single field of a document or an individual field of an embedded document Grammar: Db.collection.createIndex ({Field:boolean}}) Boolean: Specifies a value of 1 for a field's ascending index, and a value of 1 for the descending index. (1) Create Example: >db.

is very simple, it has its own content management and Web statistics system.Weebly allows you to edit the generated code, export it, or go to WordPress is also possible. If you want to move the site later or hand it over to a professional, it's easy to do it. Weebly also offers free hosting, so you don't have to pay for additional escrow fees.However, templates in weebly are more complex than other web-building tools.3.SquareSpaceOfficial website: http://squarespace.com/

index types, including text, space, and hash indexes. View the index type for more information. options document Second, the basic operation of the indexLet's insert the 10w record first. for(varI=0; I1000000; I++){ . Db. Orders.Insert({"Onumber": I, "date": " -- -- Geneva"," CNAME ":" Zcy "+I, "items":[{"Ino": I, "quantity": I, "Price": 4.0 },{"ino": i+1, "Quantity": I+1, "Price"

1.1.1 Summary Join is one of the important operations of the relational database system. Common Join Operations in SQL Server include internal Join, external Join, and cross Join. If we want to obtain data from two or more tables that matches rows in one table with rows in another table, we should consider using Join, because Join queries a specific joined table or functionThis article will introduce the features and usage of various common joins in SQL through examples:1.1.2 textFirst, we defin

Print out the array: Array( [0] => Array ( [name] => 第一章 [cname] => 1 雅典娜的圣斗士 ) [1] => Array ( [name] => 第一章 [cname] => 2 燃烧吧。。。 )) When the output of foreach ($k as $v) {} is found, the first chapter is also followed by the loop 第一章 1雅典娜的圣斗士第一章 2 燃烧吧。。。 How to do the first chapter of this field only loop 1 times? 第一章 1雅典娜的圣斗士

Geohash encapsulated into the built-in database functions of the simple solution, to achieve early initial business. Implementation process:1. Build a tableCREATE TABLE ' Tongzhou ' (' ID ' INT (one) not NULL auto_increment,' CNAME ' VARCHAR (255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,' Oint ' point is not NULL,PRIMARY KEY (' id '),SPATIAL KEY ' sp_index ' (' oint ')) Engine=innodb auto_increment=1 DEFAULT charset=utf8mb4 collate=utf8mb4_unicode_ci

function. Static int bf_init_key (evp_cipher_ctx * CTX, const unsigned char * key, Const unsigned char * iv, int ENC) { Bf_set_key ( Data (CTX)-> KS, evp_cipher_ctx_key_length (CTX), key ); Return 1; } # Endif in OpenSSL/EVP/evp_locl.h, this macro is defined as: # define implement_block_cipher (cname, ksched, cprefix, kstruct, NID ,\ Block_size, key_len, iv_len, cbits ,\ Flags, init_key ,\ Cleanup, set_asn1, get_asn1, CTRL )\ Block_cipher_all_funcs (

', discuz_table_extendable);}/*** Create Model objects under the Discuz system* @param string $name* @return Discuz_model*/public static function M ($name){$args = Array ();if (Func_num_args () > 1) {$args = Func_get_args ();unset ($args [0]);}Return Self::_make_obj ($name, ' model ', true, $args);}/*** Create an object instance* @param string $name class ID, format "# $pluginid # $name"* @param string $type represents the namespace, supports only one level, and the file name is prefixed with t

; I For (Int J = 0; j String cname = colsheji [J]; If (convert. isdbnull (Dt. Rows [I] [cname]) continue; Arrdec [J] + = tools. todec (Dt. Rows [I] [cname] + ""); } } // Assign a value For (INT I = 0; I String cname = colsheji [I]; If (arrdec [I] = decimal. Zero) Dr [cname]

procedure if exists 'njfyedepartment '. 'sp _ port port' $Create definer = 'root' @ '%' PROCEDURE 'sp _ Port '(IN qureyType VARCHAR (20), IN daytime VARCHAR (20), IN p_ids VARCHAR (50 ), IN c_ids VARCHAR (50), IN ct1_ids VARCHAR (50), IN ct2_ids VARCHAR (50), IN ku VARCHAR (50), IN ireport_chart varchar (50 ))BEGINDECLARE I INT DEFAULT 1;IF qureyType = 'insert' OR qureyType = 'insert' THENInsert into ireport(Pid, cid, ct1id, ct2id, creatTime, crawler number, WEEK)SELECT province AS pid,Cityid A

(CASE CNAMEWHEN 'JAVA' THENSCOREEND) JAVA,MAX(CASE CNAMEWHEN 'mysql' THENSCOREEND) mysqlFROMstdscoreGROUP BYSNAME; You can add the Else statement in the first Case to solve this problem: SELECTSNAME,MAX(CASE CNAMEWHEN 'JAVA' THENSCOREELSE0END) JAVA,MAX(CASE CNAMEWHEN 'mysql' THENSCOREELSE0END) mysqlFROMstdscoreGROUP BYSNAME; Method 2: SELECT DISTINCT a.sname,(SELECT score FROM stdscore b WHERE a.sname=b.sname AND b.CNAME='JAVA' ) AS 'JAVA',(SELECT score FROM stdscore b WHERE a.sname=b.s

Note the environment of this series of Files: Oracle Data and jdom1.0The following tables and data are used in a total of four files.The Oracle table structure is as follows:/* The most critical fields in this table are CID and PID. Other fields can be increased or decreased as needed */Create Table Scott. Company(CID number (4) not null,/* Record ID */Cname varchar2 (20) not null,/* name */Descpt varchar2 (40) null,/* Description */PID Number (4) nul

Add and remove class names based on JavaScript and remove class names using javascript Method 1: Use the className attribute; Method 2: Use the classList API; // Function reg (name) {return new RegExp ('(^ | \ s)' + name + '(\ s + | $) ');} // hasClass addClass removeClass toogleClassvar hasClass, addClass, removeClass; if ('classlist' in document.doc umentElement) {hasClass = function (obj, cname) {return obj. classList. contains (

Method 1: Use the ClassName property;Method 2: Use the classlist API;//used to match the existence or absence of a class namefunctionReg (name) {return NewRegExp (' (^|\\s) ' +name+ ' (\\s+|$) ');}//hasclass addclass removeclass toogleclassvarHasclass,addclass,removeclass;if(' Classlist 'inchdocument.documentelement) {Hasclass=function(obj,cname) {returnobj.classList.contains (CNAME); }; AddClass=functio

repeated read, dirty read. 3 ).READ ONLY: A read-only transaction. It is a subset of the serialization level. Only data submitted before the start of the transaction can be seen, but DML statements cannot be performed in the transaction. There are only three transaction levels in ORACLE, of which the default read committed level exists. There are 5 standard SQL transaction levels (For details, refer to Baidu ). 6. Set the transaction isolation level syntax: SET transaction isolation level [rea

VIEWD:grant61. To revoke a table s that already exists in the database, available | | c| |.A:delete TABLE SB:delete SC:drop TABLE SD:drop S62. To add a list of CNAME (course name) in basic table S, available | | c| |.A:add TABLE S (CName CHAR (8))B:add TABLE S ALTER (CName CHAR (8))C:alter TABLE S ADD (CName CHAR (8))

JSON code: [{ quot; cId quot;: 2, quot; cName quot;: quot; \ u767d \ u841d \ u535c quot;, quot; amount quot;: 26, quot; price quot;: quot; 17 quot ;},{ quot; cId quot;: 3, quot; cNa JSON code: [{"CId": 2, "cName": "\ u767d \ u841d \ u535c", "amount": 26, "price": "17 "}, {"cId": 3, "cName": "\ u80e1 \ u841d \ u535c", "amount": 21, "price": "21" },{

This article will share with you the function of adding and removing javascript class names. For more information about how to add and remove javascript class names, see this article. Method 1: Use the className attribute; Method 2: Use the classList API; // Function reg (name) {return new RegExp ('(^ | \ s)' + name + '(\ s + | $) ');} // hasClass addClass removeClass toogleClassvar hasClass, addClass, removeClass; if ('classlist' in document.doc umentElement) {hasClass = function (obj,

Essentials of Web App Design 1. Color Matching Color is one of the main elements that a designer conveys emotion. A clear brand color, to trust, the degree of awareness will be greatly improved. In addition to the color for the interface to enhance the aesthetic, but also as a function of auxiliary. In the General page information of large enterprise products, often a color button is very easy to attract the user's visual focus. Lovely is a web App designed by Dribbble Kerem Suer. Orange Main

You need to add a reference System.Runtime.Serialization.dll [{"CID": 2, "CNAME": "\u767d\u841d\u535c", "Amount": +, "price": "+"},{"CID": 3, "CNAME": "\u80e1\u841d\u535c", " Amount ": +," price ":"},{"CID": 4, "CNAME": "\u7389\u7c73", "Amount": 7, "Price": "},{" CID ":", "CNAME": "\u897f\ U74DC "," Amount ": 7," Price