php - Selecting data from table using another table's data -

-

i'm building app stores data different types of products. here schema of products table:-

------------------------------------------------------------------------------------ | id  | product_name  | price | details  | category_id | phone_ram  | bike_mileage | ------------------------------------------------------------------------------------

here, id, product_name, price , details column applicable products. 'phone_ram' column applicable items under 'phone' category , 'bike_mileage' column applicable items under 'bike' category.

here 'category' table:-

---------------------- | id | category_name | ---------------------- |  1 | phone         | ---------------------- |  2 | bike          | ----------------------

and here 'category_data' table stores name of data of category. 

----------------------------------- | id | category_id | name_of_data | ----------------------------------- |  1 |           1 | phone_ram    | ----------------------------------- |  2 |           2 | bike_mileage | -----------------------------------

now, in query. first, select columns 'products' table applicable of kinds of data. 'category_id' of table same table , check on 'category_data' table find additional data products table. again select additional data according categories products table. ie: 'phone_ram' column if category 'phone'.

how achieve it?

using php:

<?php  session_start();  include 'db_connect.php';    $get_category = mysqli_query("select * category category_name = '$categoryin'");   if(mysqli_num_rows($get_category)==0){      //no result when looking category   }   else {       //select table      $category = mysqli_fetch_array($get_category);      $categoryname = $category['category_name'];      $categoryid = $category['id'];        //start selecting other table based on first query       $get_nameofdata = mysqli_query("select * category_data category_id = '$categoryid'");       if(mysqli_num_rows($get_nameofdata)==0){          //no category data result.       }      else{          $cat_data = mysqli_fetch_array($get_nameofdata);           $nameofdata = $cat_data['name_of_data'];         }        //your name_of_data result      echo $nameofdata;  }

wrote in hurry, hope helps.

also, try use structure in database :)


Comments

Post a Comment

Popular posts from this blog

yii2 - Yii 2 Running a Cron in the basic template -

-
i have seen instructions on running cron in advanced template, cant figure out how on basic template. have following controller in basic controllers folder. <?php namespace app\controllers; use yii\console\controller; /** * cron controller */ class croncontroller extends controller { public function actionindex() { echo "cron service runnning"; } public function actionmail($to) { echo "sending mail " . $to; } } i have navigated root of application , tried these comands yii cron php yii cron im getting unknown comand "cron" i know old question failed find actual answer this. if @ code yii exec file you'll notice requires /common/config/aliases.php file console/config/main.php. can naturally change these or copy on these advanced template. hope solves problem wanting same thing.
Read more

asp.net - 'System.Web.HttpContext' does not contain a definition for 'GetOwinContext' Mystery -

-
i realize question might seem trivial some, it's these types of things find myself fighting quite bit , want make sense of despite seeming losing battle in .net (for me anyway). so, if following: using system.web; ... applicationuser user = system.web.httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); that produces error in title , red getowincontext() , error cannot resolve symbol 'getowincontext()' however, if following (remove system.web in front of httpcontext ), works expected (or @ least no errors): using system.web; ... applicationuser user = httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); however, if (same line that's working using system.web commented out): //using system.web; ... applicationuser user = httpcontext.getowincontext().getusermana...
Read more

mercurial graft feature, can it copy? -

-
there new feature in mercurial 3, called 'graft' (graft local). job of moving change-set different branch. is there way "copy" change-set branch? i interested in in moving stuff qa branch production branch, still need code reside in qa. want copy. found , have tried few things, maybe it'll become clear more tinkering , reading... does have better way of 'cherry picking' change-sets move cross branch (or trunk)??? graft copies changesets, doesn't move them. hg graft (emphasis mine): this command uses mercurial's merge logic copy individual changes other branches without merging branches in history graph. known 'backporting' or 'cherry-picking' . default, graft copy user, date, , description source changesets.
Read more