其他部分不顯示來自php的內容

<?php 
$regs=$_GET["regs"]; 
$schm=$_GET["schm"]; 

//echo $regs; 

$con = mysql_connect('localhost', 'root', ''); 
if (!$con) 
    { 
    die('Could not connect: ' . mysql_error()); 
    } 

mysql_select_db("adjpoly", $con); 

$sql="SELECT * FROM student WHERE Register = '".$regs."'"; 

//echo $sql; 

$result = mysql_query($sql); 


$sql1="SELECT `Semester`,`Subject`,`Internal`,`External`,`Total`,`Result`,`Arrear` FROM semester".$schm." where Register ='".$regs."'"; 

//echo $sql1; 
$result1 = mysql_query($sql1); 

while($row = mysql_fetch_array($result)) 
{ 
    if($row==NULL) 
    { 
     echo '<b style="background-color:#000000">Invalid Number.</b>'; 
    } 
    else 
    { 
echo "<table style='border:1px solid black;border-collapse:collapse;' width='70%'> 
<tr><td style='border:1px solid black;font-weight:bold;background-color:#E2E2E2;font:Tahoma; font-size:13pt' align='right' width='20%'>Name</td> 
<td style='border:1px solid black;font-weight:bold;color:#0000CC;background-color:#E2E2E2;font:Tahoma; font-size:13pt'>" . $row['Name']."(". $row['Register']. ")"."</td> 
</tr> 
<tr><td style='border:1px solid black;font-weight:bold;background-color:#E2E2E2;font:Tahoma; font-size:13pt' align='right' width='20%'>Institution Code</td> 
<td style='border:1px solid black;font-weight:bold;color:#0000CC;background-color:#E2E2E2;font:Tahoma; font-size:13pt'>" . $row['Icode'] . "</td> 
</tr> 
<tr><td style='border:1px solid black;font-weight:bold;background-color:#E2E2E2;font:Tahoma; font-size:13pt' align='right' width='20%'>Course</td> 
<td style='border:1px solid black;font-weight:bold;color:#0000CC;background-color:#E2E2E2;font:Tahoma; font-size:13pt'>" . $row['Course'] ."(FULLTIME)"."(". $row['CCode']. ")". "</td> 
</tr> 
<tr><td style='border:1px solid black;font-weight:bold;background-color:#E2E2E2;font:Tahoma; font-size:13pt' align='right' width='20%'>Scheme</td> 
<td style='border:1px solid black;font-weight:bold;color:#0000CC;background-color:#E2E2E2;font:Tahoma; font-size:13pt'>" . $row['Scheme'] . "</td> 
</tr>"; 
echo "</table>"; 

echo "<B> Result : P - Pass F - Fail A - Absent </B>"; 
echo "<table style='border:1px solid black;border-collapse:collapse;' width='70%'> 
<tr> 
<th style='background-color:#0099CC;color:white;font-size:14pt'>Semester</th> 
<th style='background-color:#0099CC;color:white;font-size:14pt'>Subject</th> 
<th style='background-color:#0099CC;color:white;font-size:14pt'>Internal Mark</th> 
<th style='background-color:#0099CC;color:white;font-size:14pt'>External Mark</th> 
<th style='background-color:#0099CC;color:white;font-size:14pt'>Total Mark</th> 
<th style='background-color:#0099CC;color:white;font-size:14pt'>Result</th> 
</tr>"; 

while($row = mysql_fetch_array($result1)) 
    { 
    echo "<tr align='center'>"; 
    echo "<td bgcolor='#E2E2E2' style='border: 1px solid black;font:Tahoma; font-size:14pt'>" . $row['Semester'] . "</td>"; 
    echo "<td bgcolor='#E2E2E2' style='border: 1px solid black;font:Tahoma; font-size:14pt'>" . $row['Subject'] . "</td>"; 
    echo "<td bgcolor='#E2E2E2' style='border: 1px solid black;font:Tahoma; font-size:14pt'>" . $row['Internal'] . "</td>"; 
    echo "<td bgcolor='#E2E2E2' style='border: 1px solid black;font:Tahoma; font-size:14pt'>" . $row['External'] . "</td>"; 
    echo "<td bgcolor='#E2E2E2' style='border: 1px solid black;font:Tahoma; font-size:14pt'>" . $row['Total'] . "</td>"; 
    echo "<td bgcolor='#E2E2E2' style='border: 1px solid black;font:Tahoma; font-size:14pt'>" . $row['Result'] . "</td>"; 
    echo "</tr>"; 
    $arr = $row['Arrear']; 
    } 
    echo "<tr align='center' bgcolor='#E2E2E2'><td width='100%' colspan='6' style='border: 1px solid black;'>&nbsp;</td></tr>"; 
    echo "<tr align='center' bgcolor='#D7DFE3'><td width='100%' align='center' colspan='6' style='border: 1px solid black;'>Arrear:" .$arr . "</td></tr>"; 
    echo "</table>"; 
    } 
} 
mysql_close($con); 
?>

上面的php代碼可以根據用戶輸入從mysql數據庫中顯示內容。其他部分不顯示來自php的內容

通過使用if語句，驗證給定的輸入是否存在於表中。基於下面的例子的語法。

if($row==NULL) 
{ 
    echo "Invalid Input."; // while run, the echo statement not displaying. 
} 
else 
{ 
o/p part.. //while run, response proper o/p 
}

任何人都可以幫助我。請輸入

來源

2013-03-17 Hari

'while（$ row ='掩蓋了if（$ row == NULL）'else部分，所以代碼不會到達else。，數據庫轉義，或者準備好語句，如果你很聰明的話 – mario 2013-03-17 13:41:18

while（）只有在該行等於true時纔會被執行，所以它不能爲null – xdbas 2013-03-17 13:43:23

thnks有任何其他的方式來傳遞我的其他部分msg用戶。？ – Hari 2013-03-17 13:53:14

我得到了正確的輸出。非常感謝你......

$row=mysql_fetch_array($result); // here the query executed 

if($row!=NULL) // here checking row not equal to null value. 
{ 

Displaying part... 

} 
else  // here if the row is NULL; it will print the following echo statement. 
{ 
echo "Invalid input."; 
}

來源

2013-03-17 15:59:32 Hari

其他部分不顯示來自php的內容

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