php - Insert varchar coupon code in database table -


i have website based on reward point. want store 'coupon code' in database record user has used code recharge account buy anything. create insert table in php insert coupon user.

i encountered problem insert into sql syntax insert int code database when use varchar code recharge account not storing data...

examples:

  • int coupon code: 22334466
  • int coupon code: su5c5e6s


<?php if(isset($_post['sub'])){     $db_host="localhost";     $db_username="root";     $db_password="";     $db_name="bs1";     $con=mysql_connect("$db_host", "$db_username", "$db_password") or die("could not connect mysql!!!");     if($con=="")     {         echo "database not connected!!!!";     }     else     {         $isdb=mysql_select_db("$db_name") or die("database not available!!!!");         if($isdb=="")         {             echo "database not selected!!!!";         }         else         {                $emp_id=$_post['emp_id'];             $code=$_post['code'];               $query = mysql_query("select * oc_abhi_reward `code`='$code'") or die (mysql_error());             $data=mysql_fetch_assoc($query);             $code_db=$data['code'];             $points_db=$data['point'];             if($code==$code_db)             {             $query1 = mysql_query("select * oc_customer `emp_id`='$emp_id'") or die (mysql_error());             $data1=mysql_fetch_assoc($query1);             $customer_id=$data1['customer_id'];              $query2=mysql_query("insert `oc_customer_reward` (customer_id, emp_id,  order_id, description, points, date_added) values ($customer_id, $emp_id,  0, 'rewarded', $points_db, now());");              $query4=mysql_query("insert `oc_customer_reward_history` (customer_id, emp_id, description, code, points) values ($customer_id, $emp_id, 'rewarded', $code, $points_db)");               $query3=mysql_query("delete oc_abhi_reward code='$code'");             header("location:http://localhost/bsl/index.php?route=account/account");             exit();             }             else             {              }                    }     } } ?> <!--php code reward entry end-->

$code should write in single quotes , code insert variable character codes in database should this,

$query4=mysql_query("insert `oc_customer_reward_history` (customer_id, emp_id, description, code, points) values ($customer_id, $emp_id, 'rewarded', '$code', $points_db)");

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