Using a variable in the WHERE Clause

Question

I am a newbie in MySQL and PHP. I have a HTML form where I would like to pass 1 variable from to my PHP code and then run a query on my database for the record that holds that v

Answer 1

I agree its a quote issue, but here is how my code would look.

  $sql = 'SELECT * FROM SiteInfo WHERE Serial = "' . $serial . '"';

or

  $sql = "SELECT * FROM 'SiteInfo; WHERE 'Serial' = \"$serial\"";      

Answer 2

Looks like a quote issue:

 $sql = 'SELECT * FROM `SiteInfo` WHERE `Serial` ='.$serial.'; 

should be

 $sql = "SELECT * FROM `SiteInfo` WHERE `Serial` ='".$serial."'"; 

Answer 3

It means your variable:

$_POST['Serial']

is coming empty. You need to run your code if it isn't empty by checking it via isset like this:

if (isset( $_POST['Serial'])) {
  $serial= $_POST['Serial'];

  // your rest of the code
}

Also if Serial is string and not a number, you need to put it in quotes, use below query:

$sql = "SELECT * FROM `SiteInfo` WHERE `Serial` = '$serial'"; 

You can also check out what does your query come up like:

$sql = "SELECT * FROM `SiteInfo` WHERE `Serial` = '$serial'"; 
echo $sql;
exit;