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This version has been added to the support of JSON since PHP5.2 started. Consists of two functions: Json_encode and Json_decode. JSON is a storage format for data, just like a string that is serialized by PHP. It is also a data description, for example, when we serialize an array and store it, it can be easily deserialized after application. The same is true of JSON, except that he builds an interactive bridge between client JavaScript and server PHP. We use PHP to generate the JSON string, and

Php_cookie { var $_name = ""; var $_val = array (); var $_expires; var $_dir = '/'/all dirs var $_site = '; function Php_cookie ($cname, $cexpires = "", $cdir = "/", $csite = "") { $this->_name= $cname; if ($cexpires) { $this->_expires= $cexpires; } else{ $this->_expires=time () + 60*60*24*30*12; ~12 months } $this->_dir= $cdir; $this->_site= $csite; $this->_val=array (); $this->extract

The code is as follows Copy Code $cates = Array (Array' CID ' => 1,' CNAME ' => ' news ',' PID ' => 0), Array' CID ' => 2,' CNAME ' => ' notice ',' PID ' => 0), Array' CID ' => 3,' CNAME ' => ' domestic News ',' PID ' => 1), Array' CID ' => 4,' CNAME ' => ' international News ',' PID ' => 1), Array' CI

In the data, the table-building process is a very useful and often seen method.the relationship between tables and tables is 1:1 ? 1:n? ? ? ? N.Three different ways.1-to-1 way 1 The way to the many1 to many, many to 1. A person can have more than one car, asking for a search of all the cars owned by someone. According to the requirements of the paradigm, two tables should be designed. The information of the person and the car are represented separately. Step 1: Draw e-r Diagram///Step 2: Buil

a ViewA view is a virtual table (not a real one), which is essentially "getting a dynamic dataset from an SQL statement and naming it", which you can use as a table by simply using "name" to get a result set.Using views we can take out the temporary table in the query process, and use the view to implement, so that later on to manipulate the temporary table data without rewriting the complex SQL, directly to the view to find, but the view has obvious efficiency problems, and the view is stored i

from student as x,student as Y where X.sage>y.sage and Y.sname= ' Liu Chen ' Three: Compound conditional join (WHERE clause contains multiple join conditions)Example 4: Study number of all students who have enrolled in course 2nd and have achieved more than 90 points, name:Select Student.sno,student.sname from STUDENT,SC where Student.sno=sc.sno and sc.cno= ' 2 ' and sc.grade>90Example 5: The names of the top 3 students of the 2nd course are queried:Select Top 3 sname as top 3 students from STU

owned by someone. according to the requirements of the paradigm, two tables should be designed, respectively, to represent the information of people and cars. Step 1: Draw the E-r diagram///Step 2: Build the Entity table separately and add the foreign KEY constraint to the table of the Multiparty CREATE table Person2 ( id VARCHAR (+) PRIMARY key, pname VA Rchar (+), sex CHAR (1)); CREATE TABLE car ( id varchar (PRIMARY) KEY, cname varchar (+), pr

the expression. The core problem of optimization is to minimize the amount of data involved in the processing of the tables in the query, thus achieving the goal of optimizing time and space. 2 Principles of Join query optimization 2.1 Use single-table operation as much as possible Given three relationship patterns: (example below) S (sno,sname,sec,birthday,email) C (Cno,cname,creadit,tname) SC (Sno,cno,score) Example: Query 1001 students to t

1 classProvince {2 Private intpid;3 PrivateString name;4 PrivateCity Citys [];5 Public voidSetcitys (city citys[]) {6 This. citys=Citys;7 }8 PublicCity [] getcity () {9 return This. Citys;Ten } One PublicProvince (intpid,string name) { A This. pid=pid; - This. name=name; - } the PublicString GetInfo () { - return"Province ID:" +pid+ ", Name:" +name; - } - } + classcity{ - Private intCID; + PrivateStri

50 commonly used SQL statements Student (S #, Sname, Sage, Ssex) Student table Course (C #, Cname, T #) curriculum SC (S #, C #, score) exam table Teacher (T #, Tname) Instructor table questions: 1. query the student ID of all the students whose scores are higher than those of the 002 course; selecta. S # from (selects #, scorefromSCwhereC #001) 50 commonly used SQL statements Student (S #, Sname, Sage, Ssex) Student table Course (C #,

becomes:1), the user to the browser to provide the domain name to access;2), the browser calls the domain name resolution library to resolve the domain name, because the CDN to the domain name resolution process has been adjusted, so the analytic function library generally obtains the domain name corresponding CNAME record, in order to obtain the actual IP address, the browser needs to parse the obtained CNAME