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Sql error problem, please help


francis Aneke
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Am designing a simple php forum platform in dreamweaver using mysql database,but when i run the script, on redirecting to a page called view_topic.com it shows this error message---->

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE id='4'' at line 1

 

The $topic_output normally echos out then followed by the above sql error message

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<?php///Error reportingerror_reporting(E_ALL);ini_set('display errors','1');include_once("connect_to_mysql.php");$topic_output='';$id=$_GET['id'];$sql="SELECT * FROM forum_question WHERE `id`='".$_GET['id']."'";$result=mysql_query($sql) or die(mysql_error()); $row = mysql_fetch_array($result); $name=$row['name']; $topic=$row['topic']; $view=$row['view']; $reply=$row['reply']; $email=$row['email']; $detail=$row['detail']; $datetime=$row['datetime']; $topic_output=' <table width="900" height="127" border="0" cellpadding="2" cellspacing="4" align="center"> <tr> <th scope="col"><li style="color:#004200;"><h3>'.$topic.'</h3></li></th> </tr> <tr> <td bgcolor="#CCCCCC"><div><p width="500px">'.$detail.'</p></div></td> </tr> <tr> <td bgcolor="#004200"><li style="color:white;"><strong>By:   '.$name.'</strong>             <strong> Email:   '.$email.'</strong></li></td> </tr> <tr> <td bgcolor="#004200"><li style="color:white;"><strong>Date/Time:        <font>'.$datetime.'</strong></li></td> </tr> <tr> <td> </td> </tr> </table>'; ?> <?php///Error reportingerror_reporting(E_ALL);ini_set('display errors','1');$answer_output='';$sql2=mysql_query("SELECT * FROM forum_answer WHERE question_id='$id'") or die(mysql_error());$row=mysql_fetch_array($sql2);while($row){ $a_id=$row['a_id']; $a_name=$row['a_name']; $a_email=$row['a_email']; $a_answer=$row['a_answer']; $a_detail=$row['a_detail']; $a_datetime=$row['a_datetime']; $answer_output.=' <table width="600" height="127" border="0" cellpadding="2" cellspacing="4" align="center"> <tr> <td><li style="color:#004200;"><strong>By:   '.$a_name.'</strong></li></td> </tr> <tr> <td bgcolor="#CCCCCC"><div><p width="500px" align="center">'.$a_detail.'</p></div></td> </tr> <tr> <td bgcolor="#004200"></li></td> </tr> <tr> <td bgcolor="#004200"><li style="color:white;"><strong>Date/Time:     '.$a_datetime.'                     <strong> Email:   '.$a_email.'</strong></strong></li></td> </tr> </table> '; }?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Untitled Document</title></head><body><div align="center" style="margin:0px 24px 0px 24px" id="topic_output"><div align="center" style="margin:0px 24px 0px 24px" id="topic_output"> <?php echo $topic_output; ?></div><br /><br /><div align="center" style="margin:0px 24px 0px 24px" id="answer_output"> <?php echo $answer_output; ?></div><br /> <?php$sql3=mysql_query("SELECT view FROM forum_question WHERE id='$id'") or die(mysql_error()); $row = mysql_fetch_array($sql3); $view=$row['view']; ////if have no counter value set counter ==1 if($view=0){ $view=1; } $sql4=mysql_query("INSERT INTO forum_question(view) VALUE('$view') WHERE id='$id'") or die(mysql_error()); ///Count more values $addview=$view+1; $sql5=mysql_query("UPDATE forum_question SET view='$addview' WHERE id='$id'") or die(mysql_error()); mysql_close(); ?><br /><br /><br /><div align="left" style="margin:0px 0px 0px 24px" id="table"><form action="add_answer.php" method="POST"><table width="595" border="0" cellspacing="0" cellpadding="2"> <tr> <td width="203"><li style="color:#004200;">NAME:</li></td> <td width="386"><label for="a_name"></label> <input type="text" name="a_name" id="a_name" size="60"/></td> </tr> <tr> <td><li style="color:#004200;">EMAIL:</li></td> <td><input type="text" name="a_email" id="a_email" size="60"/></td> </tr> <tr> <td valign="bottom"><li style="color:#004200;">ANSWER:</li></td> <td><label for="a_answer"></label> <textarea name="a_answer" id="a_answer" cols="57" rows="10"></textarea></td> </tr> <tr> <td colspan="2"> <input type="submit" name="submit" id="submit" value="SUBMIT" /> <input type="reset" name="reset" id="submit2" value="RESET" /> </td> </tr></table><input name="id" type="hidden" value="<?php echo $id; ?>"/></form></div></div></body></html>

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I skimmed through the code and noticed this:

 

$id=$_GET['id'];$sql="SELECT * FROM forum_question WHERE `id`='".$_GET['id']."'";

 

Try changing to:

$sql="SELECT * FROM forum_question WHERE id=".$_GET['id']; // you can use $id here as well since $id is given the value of $_GET['id']. Also make sure $_GET['id'] contains a value.

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