View models and pagination

A View Model
The correlation model can solve a pair of one or one-to-many and many-to-many associated operations. They are generated by generating multiple SQL statements
Then the array is assembled to get the final desired result. For one-on-one such has_one and belongs_to multiple tables
The view model can be used to correlate queries. It uses a federated query (join), which is ideal for such query requirements.

In Weibo/home/controller/usercontroller. the code in class. PHP is:

1 class extends Controller {2      Public function index () {3         $user = D (' Userview '); 4         Var_dump ($user->group (' id '),Select ()); 5     }6  }

Note that tables with no userview in the data table

New Weibo/home/model/userviewmodel. Class. PHP , the code is:

1<?PHP2 namespace Home\model;3  UseThink\model\viewmodel;4 5 classUserviewmodelextendsViewModel {6     protected $viewFields=Array(7' User ' =Array(' id ', ' user ', ' email ',),8' Card ' =Array(' Code ', ' _on ' = ' user.id=card.uid '),9         );Ten}

At this point, you can connect the user table and the card table in the data table:

Where the user table is:

The card table is:

The data after the connection is:

PS: Use the associated query to display the User table and contain the data associated with the Card table, which is not associated is ignored. If
If you want to make an unrelated query, you can use left-hand query.

1 // Left JOIN 2 Array (' id ', ' user ', ' email ', ' _type ' = ' left '),

1 // using group grouping to remove duplicate data 2 Var_dump ($user->group (' id ')->select ());

1 // use Count to get the number of bars associated 2 Array (' id ', ' user ', ' email ', ' _type ' = ' left ', ' COUNT (content.id) ' = ' abc '),

Second, paging function

In Weibo/home/controller/usercontroller. insert code in class. PHP :

1<?PHP2 namespace Home\controller;3  UseThink\controller;4  UseThink\page;5 6 classUsercontrollerextendsController {7      Public functionindex () {8         $user= D (' User ');9         $count=$user-Count();Ten         $page=NewPage ($count, 1); One         $page->setconfig (' first ', ' home '); A         $page->setconfig (' prev ', ' prev '); -         $page->setconfig (' Next ', ' next page ')); -         $page->setconfig (' Last ', ' End '); the         $page->setconfig (' theme ', ' Total%total_row% data Total%total_page% page%first%%up_page%%link_page%%down_page%%END% '); -         $show=$page-Show (); -         $list=$user->limit ($page->firstrow,$page->listrows)Select (); -         $this->assign (' list ',$list); +         $this->assign (' page ',$show); -         $this-display (); +     } A}

The code in weibo/home/view/user/index.html is as follows:

1 <TableBorder= "1">2      <TR><th>Id</th><th>User</th><th>Email</th></TR>3      <foreachname= "List"Item= "obj">4          <TR><TD>{$obj. ID}</TD><TD>{$obj. User}</TD><TD>{$obj. Email}</TD></TR>5      </foreach>6 </Table>7{$page}

The displayed effects are as follows:

Note: There is no "home" and "last", next time remember to look at the manual where the problem

1 // Set page name of the variable 2 ' var_page ' = ' PAGE ',

If not set, the URL is http://localhost/demo39/index.php/user/index/p/2.html

Set to: http://localhost/demo39/index.php/user/index/page/2.html

Another way of paging is:
In Weibo/home/controller/usercontroller. the code in class. PHP is:

1<?PHP2 namespace Home\controller;3  UseThink\controller;4  UseThink\page;5 6 classUsercontrollerextendsController {7      Public functionindex () {8         $user= D (' User ');9         $list=$user->page ($_get[' Page ']. ', 1 ')Select ();Ten         $count=$user-Count(); One         $page=NewPage ($count, 1); A         $show=$page-Show (); -         $this->assign (' list ',$list); -         $this->assign (' page ',$show); the         $this-display (); -     } -}

Notice how many bars are displayed on each page, $page = New page ($count, 1) , and the following 1 must

and $list = $user->page ($_get[' page ']. ', 1 ')->select (); 1 in the same.

The code in weibo/home/view/user/index.html remains the same

View models and pagination