erd notation

PHP PDO notation connection mysql;Writing one:$db = "Mysql:host=localhost;dbname=sql"; //connection data, address localhost; database name SQL;$username = "root"; Database login account;$password = "root"; Database login password;try{$pdo =new PDO ($db, $username, $password); Connection database Assignment $pdo;}catch (Pdoexception $e) {echo "PDO connection Failed". $e->getmessage ();}Two:$db =new PDO ("Mysql:host=localhost;dbname=sql", "root", "root"

Ext.: http://www.2cto.com/kf/201408/328974.htmlThe following simplified notation is a new formulation after IOS6.0NSNumberTo simplify the previous wording:NSNumber *value1;value1 = [NSNumber numberwithint:12345];value1 = [NSNumber numberwithfloat:123.45f];value1 = [NSNumber numberwithdouble:123.45];value1 = [NSNumber numberwithbool:yes];The simplified wording:NSNumber *value2;value2 = @12345;value2 = @123.45f;value2 = @123.45;value2 = @YES;Boxing expr

JavaScript can initialize arrays by array literal notation, however, ie and other browsers differ in handling the empty values of the array literal notation, as shown in the following code.Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Considerations for array literal notation in JavaScript

, it is called the property of the object.MODULE1.M1 ();However, such a notation exposes all module members, and the internal state can be overridden externally.For example, external code can directly change the value of an internal counter.Module1._count = 5;iii. immediate execution of function notationUsing the "Execute function Now" (immediately-invoked functions Expression,iife),Can achieve the purpose of not exposing private members.var module1 =

This article mainly introduces how PHP converts scientific notation to the original numeric string. it is a very practical technique to implement this function through a simple custom function using regular expression replacement, for more information about how PHP converts scientific notation to the original numeric string, see the following example. The specific implementation code is as follows: The

: This article mainly introduces the php scientific notation conversion normal numerical output solution. if you are interested in the PHP Tutorial, please refer to it. Directly add code /*** @ Param $ num scientific notation string such as 2.1E-5 * @ param int $ double decimal point reserved digits 5 by default * @ return string */function sctonum ($ num, $ double = 5) {if (false! = Stripos ($ num, "e

Given An expression string array, return the Reverse Polish notation of this expression. (Remove the parentheses)ExampleFor the expression [3 - 4 + 5] (which denote by ["3", "-", "4", "+", "5"]), return [3 4 - 5 +] (which denote by ["3", "4", "-", "5", " +"])1 Public classSolution {2 /**3 * @param expression:a string array4 * @return: The Reverse Polish notation of this expression5 */6 Public

Simulation: parsing of the grammarHash all key construction planning, for recording at several locations the original string of each node begins the output.。。。On each of the queries along the graph walk can be.。。。 Hierarchical Notation Time limit: 2 Seconds Memory Limit: 131072 KB In Marjar University, students in College of computer science would learn EON (Edward Object

Processing of scientific notation when exporting excel in PHP $ activeSheet- gt; getStyle ($ this- gt; numToEn ($ col ). ($ row + 2)- gt; getNumberFormat ()- gt; setFormatCode (PHPExcel_Style_NumberFormat: processing of scientific notation when fo php exports an excel file $ ActiveSheet-> getStyle ($ this-> numToEn ($ col ). ($ row + 2)-> getNumberFormat ()-> setFormatCode (PHPExcel_Style_NumberFormat: F

Before reading this article, please read my previous article, the previous article has focused on POI set Excel cell format as text format, the rest of the set decimal, percent, currency, date, scientific notation and Chinese capitalization these will be written in one by one belowEach of the following will be used in these three rows of variablesHssfworkbook Demoworkbook = new Hssfworkbook ();Hssfsheet Demosheet = Demoworkbook.createsheet ("The World