php - MySQL Syntax Error During UPDATE - 


if($_post['submit']) {     $day1 = $_post['day1'];     $day2 = $_post['day2'];     $day3 = $_post['day3'];     $day4 = $_post['day4'];     $day5 = $_post['day5'];     $day6 = $_post['day6'];     $day7 = $_post['day7'];     $day8 = $_post['day8'];     $day9 = $_post['day9'];     $day10 = $_post['day10'];     $day11 = $_post['day11'];     $day12 = $_post['day12'];     $day13 = $_post['day13'];     $day14 = $_post['day14'];      $query_update = ("update user_glucose set (day1='$day1',day2='$day2',day3='$day3',day4='$day4',day5='$day5',day6='$day6',day7='$day7',day8='$day8',day9='$day9',day10='$day10',day11='$day11',day12='$day12',day13='$day13',day14='$day14') username='$username'");      $result_update = mysql_query($query_update);     echo "data updated !";     echo"<p>";     echo mysql_error();     echo"</p>";   }

i trying update value form table named "user_glucose". whenever click on submit error pops :

you have error in sql syntax; check manual corresponds mysql server version right syntax use near '(day1='10',day2='10',day3='0',day4='0',day5='0',day6='0',day7='0',day8='0',day9=' @ line 1

i new php , mysql programming , don't know problem. please help. thank you.

you don't need use parenthesis in update query, change to

    $query_update = ("update user_glucose set day1='$day1',day2='$day2',day3='$day3',day4='$day4',day5='$day5',day6='$day6',day7='$day7',day8='$day8',day9='$day9',day10='$day10',day11='$day11',day12='$day12',day13='$day13',day14='$day14' username='$username'");

then let know @ risk of sql injection, have here how can prevent sql injection in php?. should use prepared statment avoid risk


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