php - Using Update CONCAT to ADD data to already Existing data in Database -


i trying make program update inside database have 1 worry. when issue update statement mysql server, want add data mysql database, overwrites first data there , saves new data database. want add data database plus existing 1 there.

my code looks 

<?php session_start(); require_once('inc/config.php'); if(!isset($_session['username'])){     header('location: signon.php'); } ?>  <?php require_once('inc/config.php');  $con = mysqli_connect($host, $user,$pass, $db) or die ('cannot connect: '.mysqli_error()); //get parameters  $inst_name = mysqli_real_escape_string($con,$_post['inst_name']); $inst_name2 = mysqli_real_escape_string($con,$_post['inst_name2']); $grade = mysqli_real_escape_string($con,$_post['grade']); $study_course = mysqli_real_escape_string($con,$_post['study_course']); $qualification = mysqli_real_escape_string($con,$_post['qualification']); $other_qualification = mysqli_real_escape_string($con,$_post['other_qualification']); $completion_year = mysqli_real_escape_string($con,$_post['completion_year']);   $data ="inst_name = '".$inst_name."',inst_name2 = '".$inst_name2."',grade = '".$grade."', study_course = '".$study_course."',qualification = '".$qualification."',other_qualification = '".$other_qualification."',completion_year = '".$completion_year."'";   //$sql = "update user_info set inst_name = '".$inst_name."',inst_name2 = '".$inst_name2."',grade = '".$grade."', study_course = '".$study_course."',qualification = '".$qualification."',other_qualification = '".$other_qualification."',completion_year = '".$completion_year."' username = '".$_session['username']."'";  $sql = "update user_info set $data=concat($data,inst_name = '".$inst_name."',inst_name2 = '".$inst_name2."',grade = '".$grade."', study_course = '".$study_course."',qualification = '".$qualification."',other_qualification = '".$other_qualification."',completion_year = '".$completion_year."') username = '".$_session['username']."'"; mysqli_query($con,$sql) or die ('failed query: '.mysqli_error($con)); mysqli_close($con);     header("refresh:0; url=edwe.php");     ?>

what apparently not doing correctly.

to create new record, rather updating existing one, try sql insert statement rather using update. insert creates records , update edits existing ones.


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