Member Avatar for Edwin_2 
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>SYNTHESIS REACTIONS</title>
</head>

<body>
<p>
Chemistry synthesis reaction equations </p>
<p>&nbsp;</p>
<form name="form1" method="post" action="index.php">
  <p>
    <label for="A"></label>
    <input type="text" name="A" id="A"> +
    <input type="text" name="B" id="B">
    <label for="B"></label>
  </p>

  <p>NB: Case Sensitive - Use Real Names!</p>

  <p>
    <input type="submit" name="solve" id="solve" value="Submit">
  </p>
  <p>
    <label for="results"></label>
    </text>
  </p>
</form>
<p>&nbsp;</p>
</body>

</html>


<?php
require_once ("dbconnect.php");

/* 2. Synthesis Reactions
a. Metal + Nonmetal = a salt
i. Ag + Cl2 = AgCl
b. Metal oxides + H2O =  a base
i. CuO + H2O = Cu(OH)2
c. Nonmetal oxide + H2O = an acid
i. SO2 + H2O = H2SO3   */

// validate the form

if (isset($_POST['A'] ))
     {
         $A = $_POST['A'];
      }
     else 
     { ?>
    <br> <? echo "data is missing "; ?> <br />
     <? }

if (isset($_POST['B'] ))
     {
         $B = $_POST['B'];
      }
      else 
      { 
      echo "data is missing"; 
       }

// Do a search in the database

$db_selected =($con);
$queryA = "SELECT symbol, charge FROM elements WHERE symbol= '" .$A. "'  ";
$queryB = "SELECT symbol, charge FROM elements WHERE symbol= '" .$B. "'  ";

$resultA = mysql_query($queryA);
$resultB = mysql_query($queryB);

$rowA = mysql_fetch_array($resultA);
$rowB = mysql_fetch_array($resultB);

      if ($rowA['charge'] < 0)
                 { ?>
            <html><tr><td> <? echo" '".$rowA['element'] . $rowB['charge'] . $rowB['element'] .
             $rowA['charge'] ."'  "; ?>
            </td></tr>
              <?  }

         elseif   ($rowA['charge'] > 0)   { ?>
             <tr><td> <? echo " '" .$rowB['element'] . $rowA['charge'] . $rowA['element'] .
              $rowB['charge']. "' "  ?>
             </td></tr></html> 
               <?  }

          else { echo "Error! Please check the parameters again";}     


     mysql_close($con);
?>
  • 4 Contributors
  • 6 Replies
  • 218 Views
  • 1 Day Discussion Span
  • Latest Post Latest Post by GrazerC0de

Recommended Answers

All 6 Replies

Member Avatar for Edwin_2

I have tried reporting the errors but didn't get much from it.Something to do with mysql_fetch_array(). Is it my code?

Member Avatar for diafol

Your SQL - there's a mistake in it/them somewhere.

BTW CuO is insoluble, so it doesn't form Cu(OH)2 under normal circumstances.

Edited by diafol
Member Avatar for pritaeas

That error is triggered when your query fails (or the connection). Try:

$resultA = mysql_query($queryA) or die(mysql_error());
$resultB = mysql_query($queryB) or die(mysql_error());

And reply with any message you see.

Member Avatar for Edwin_2

Ok, that seems to give me better errors now. Thanks. I guess i forgot to specify the database. I will fix this in a few mins and see if it works.

Member Avatar for Edwin_2

Thanks, that does her!

Member Avatar for GrazerC0de

something to do with sql query

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