The difference between database access crud;__self__ and __action__; automatic collection of forms: $n->create ();

I. TP Framework data access (PDO Foundation)

 Public functionTest () {$n= D ("Nation"); //Select (); Find (); Enquiry1.$attr=$n->select ();//check all, return an associative array, two-dimensional associative array2.$attr=$n->select ("n001,n002");//based on the parameter (primary key value)3.$attr=$n->find ("n002");//Check One piece of data, one-dimensional array//where//coherent operation4.$n->where ()->select ();//add condition, $n->where () returns an object 　　　　 $n->where ("Name=> ' Han ' or name= ' hui '")Select (); 5.table//If you look for data other than the Nation table, use table 　　　　 $attr=$n->table ("info")Select (); 6.field//Specify a field query (check a few columns) 　　　　 $attr=$n->field ("code")Select (); 7.order//Sort 　　　　 $attr=$n->order ("Code desc")Select (); 8.limit//page Out 　　　　 $a=$n->limit (3,5)->select ();//Skip 3 data to fetch 5 data 　　　　 $a=$n->limit (3)->select ();//Fetch 3 Data9.page//page Out 　　　　 $a=$n->page (3,5)->select ();//the 3rd page shows 5 data, according to the number of pages from the dynamic paging10.group//Grouping 　　　　 $a=$nation->field ("Brand,avg (Price)")->group ("Brand")Select (); 11.having//Finish group plus conditions 　　　　 $a=$nation->field ("Brand,avg (Price)")->group ("Brand")->having ("avg. >40")Select (); 12.distinct//Go heavy 　　　　 $a=$nation->field ("Brand")->distinct (true),Select (); 13.getField//gets the data for a field, only queries the column name, does not write where condition, default to the least-indexed field 　　　　 $a=$nation->where ("code= ' n001 '")->getfield ("name"); 14.sum,Count,Max,min  　　　　 $a=$nation->table ("Car")sum (price); 15.Join.. On//the column that asks for the query is given an alias display, and the alias is customized to 　　　　 $a=$nation->field ("Info.code as ' code ', info.name as ' name ', nation.name as ' People '")Join("Info on Info.nation=nation.code")Select (); 16.cache//Data Caching17.query//Native SQL statement query 　　　　 $sql= "SELECT * From Nation"; $a=$nation->query ($sql); 18.execute//Native SQL statement other actions modified　　　　 $sql= "Update Nation set name= ' Manchu ' where code= ' n001 '"; $a=$nation->execute ($sql); Var_dump($a);}

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Second, automatic collection of forms:

application/lianxi/controller/maincontroller.class.php

<?phpnamespace Lianxi\controller; UseThink\controller;classMaincontrollerextendscontroller{ Public functionBiaodan () {//implement two logical//1. Display Add page 2. Adding data to a database        if(Empty($_post))        {            $this-Show (); }        Else        {            $n= D ("Nation"); $n->create ();//automatically collect the form, provided that the post data is required, if the post is empty, go to the name of input in the if;html page must correspond to the column name of the database table, case sensitive            $z=$n-Add (); if($z)            {                //Jump Method One//$this->success ("Add Success", "Biaodan", 5);//5 is jump time, Interval 5 sec//Jump method two                $this->redirect (' Biaodan ',Array(), 5, "page jump ...");//Array (' ID ' =>2), jump page can pass parameters, associated            }            Else            {                $this->error ("Add failed!");//one parameter, error failure returns to the previous page by default            }        }    }        //using the Address bar to pass parameters, such as: Main/canshu/id/5, method to accept the use of     Public functionCanshu ($id)    {        //method One//echo $_get["id"]; Method Two: Canshu ($id)        Echo $id;//if the $id is assigned a value of Canshu ($id =0), the address bar does not give the parameter will not error    }}

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Application/lianxi/view/main/biaodan.html

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1. How to remove the error message after the page fails:
2. The question where the ACTION in the form <form> is pointing: Point to __self__ or __action__
First Var_dump (Get_defined_constants (True)), display system constants, find __self__ and __action__;
__self and __action__ differences: __self__ access is itself, is the browser access to the address, such as: localhost/tp/index.php/home/main/biaodan/code/ (Code and 10 are arbitrary arguments), __action__ can only access to Biaodan (method) here
The difference between database access crud;__self__ and __action__; automatic collection of forms: $n->create ();