You have an error in your SQL syntax; check the manual that corresponds to your mariadb server

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ERROR: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 'AND user.password=''' at line 1

The error is in the line

$query = mysqli_query($conn,"SELECT * FROM user WHERE user.mobileno=$mobile AND user.password='$pwd'") or die("ERROR:".mysqli_error($conn));

My code:

<?php include "db.php" ?>
<?php
if(isset($_POST['submit'])){
    $mobile=$_POST["mno"];
    $pwd=$_POST["password"];
    $query = mysqli_query($conn,"SELECT * FROM user WHERE user.mobileno=$mobile 
    AND user.password='$pwd'") or die("ERROR".mysqli_error($conn));
}

What I have tried:

I have tried a lot of advice online but couldn't resolve this error.

Posted 9-Jan-21 19:19pm

Deepak R Ksheerasagar

Updated 9-Jan-21 19:57pm

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OriginalGriff · Accepted Answer · 2021-01-09T19:57:00

Quote:

Replace the $query with

PHP

$query = mysqli_query($conn,"select * FROM user WHERE user.mobileno='$mobile' AND user.password='$pwd' ") or die("ERROR:".mysqli_error($conn));

No! Don't do it like that! 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?

Deepak R Ksheerasagar · Accepted Answer · 2021-01-09T19:37:00

Solution 1

Sorry for the naive question, I'm a dumbwit apparently.
You have to enclose the

$mobile

in the $query within ''.
Replace the $query with

$query = mysqli_query($conn,"select * FROM user WHERE user.mobileno='$mobile' AND user.password='$pwd' ") or die("ERROR:".mysqli_error($conn));

Posted 9-Jan-21 19:37pm

Deepak R Ksheerasagar