Fatal error: uncaught mysqli_SQL_exception: please

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Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '','Present','2022-04-12')' at line 1 in E:\xampp\htdocs\DailyExpense-System\attendance.php:17 Stack trace: #0 E:\xampp\htdocs\DailyExpense-System\attendance.php(17): mysqli_query(Object(mysqli), 'INSERT INTO `at...') #1 {main} thrown in E:\xampp\htdocs\DailyExpense-System\attendance.php on line 17

What I have tried:

   if (isset($_POST['attendance'])) {
        $date=date("Y-m-d");


//echo $member_id=$_POST['attendence'];
       foreach($_POST['status'] as $id=>$status){
       $member_name=$_POST['member_name'][$id];
       $member_id=$_POST['member_id'][$id];


         $sql1="INSERT INTO `attendance`(`member_id`, `member_name`, `status`, `date`) VALUES ('$member_id',$member_name','$status','$date')";
           $result1=mysqli_query($con,$sql1);
           if(!$result1){
               die("ERROR".mysqli_error($con));
           }

           }

                   }

Posted 11-Apr-22 20:34pm

Mehran Munir

Updated 11-Apr-22 20:53pm

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OriginalGriff · Answer 1 · 2022-04-11T20:53:00

Look at your code:

$sql1="INSERT INTO `attendance`(`member_id`, `member_name`, `status`, `date`) VALUES ('$member_id',$member_name','$status','$date')";

Where is the opening quote for $member_name?

But much more importantly, never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?