Problems with displaying mysql results
Question
<?php
include('../Adress/includes/mysql_connection_recepti.php');
if (isset($_POST['username'])){
$conn = dbConnect($_POST['username']);
$city=$_POST['city'];
$sql= 'SELECT * FROM adress_table WHERE city="'.$city.'"';
$result=mysql_query($sql);
$numRows=mysql_num_rows($result);
?>
<p><?php echo $numRows; ?> records is found.</p>
<table>
<tr>
<th>Number</th>
<th>Name</th>
<th>Last Name</th>
<th>City</th>
<th>Country</th>
<th>Date</th>
</tr>
<?php
$n=0;
while($row = mysql_fetch_assoc($result)){
//print_r($row);
$n++;
?>
<tr>
<td><?php echo $n . ".";?></td>
<td><?php echo $row['name'] ?></td>
<td><?php echo $row['last_name'] ?></td>
<td><?php echo $row['city'];?></td>
<td><?php echo $row['country'] ?></td>
<td><?php echo $row['date'] ?></td>
</tr>
<?php }?>
</table>
<?php }?>
</body>
<body>
<form action="" method="post">
<input type="text" id="username" name="username"/>
<select name="city">
<option value="new_york">New York</option>
<option value="london">London</option>
<option value="belgrade">Belgrade</option>
<option value="zagreb">Zagreb</option>
<option value="moscow">Moscow</option>
<input type="submit" value="Find">
</select>
</body>
As you can see, my sql statement tells that every column has to be displayed when city="'.$city.'", and that is completely ok. But when I try to display some particular column(s), not all (*), for example
$sql= 'SELECT name,last_name FROM adress_table WHERE city="'.$city.'"';
then error emerges, bacause
<td><?php echo $row['city'];?></td>
<td><?php echo $row['country'] ?></td>
<td><?php echo $row['date'] ?></td>
are not defined. In order to fix this I put @ sign
<td><?php @ echo $row['city'];?></td>
<td><?php @ echo $row['country'] ?></td>
<td><?php @ echo $row['date'] ?></td>
to cover up error messages and I cat tell you that everything looks perfectly all right, but I don't know is it good practice. What should I do? Thanks.
2 answers
solution1
2 ACCPTED 2013-06-30 08:51:34
您可以使用if来检查其中是否有东西：
<?php echo isset($row["city"]) ? $row["city"] : "" ?>
solution2
1 2013-06-30 08:52:08
You are trying to display a column that is not present in your SQL query. YOu can use something like -
<?php echo isset($row["city"]) ? $row["city"] : "" ?>
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