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how to Insert calculate values to database


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I'm trying to insert calculate values to DB.this is my code



class cal{

public function insert($a,$b){


$sql = "INSERT INTO cropplant (sbetweenQ ,sbetweenC ,sbetweenTC ) VALUES ('$a', '$b', '$c')";
$query = mysql_query($sql);
			echo '<script type="text/javascript">alert("DB Update error ! please Re-enter your details.");</script>'; 

			echo '<script type="text/javascript">alert("New Cropplant Added Successfuly.");</script>'; 


echo"please enter all";


what is the error in this code.please help

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in general, you wouldn't put derived values into a database, but assuming your code is just an example/exercise, you didn't show us the code that's making an instance of your cal class and calling the ->insert() method.


also, you should not be using the msyql_ database functions because they are obsolete and will be removed in a future php version, which is interesting because at least one of your earlier threads in this forum was using the mysqli_ database functions.

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1. Not checking if the "a" and "b" POST values are present

2. Defining a class in a file alongside (I think?) regular code

3. Using variable names that have no intrinsic meaning

4. Random indentation style

5. Not sanitizing/validating the form input and/or the a and b values

6. Putting output inside a method when it should be returning success or failure

7. Not actually calling any of the insert() code

8. Using mysql extension instead of PDO or mysqli or something else

Edited by requinix
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