我的代码引发了意外警告。除搜索部分外，代码一切正常。
当我搜索我的数据时，我从未搜索过我收到此消息
Warning: mysql_num_rows() expects parameter 1 to be resource
这是我的html：
<html>
<head>
<title>
Employee Details
</title>
</head>
<body>
<?php
$page='index.php';
mysql_connect('localhost','root','') or die (mysql_error());
mysql_select_db('employee') or die (mysql_error());
/* {DELETE AN ENTRY FROM THE LIST AND DATABASE -START*/
if(isset($_GET['delete']))
{
mysql_query('DELETE FROM details where empid='.mysql_real_escape_string((int)$_GET['delete']));
}
/* DELETE AN ENTRY FROM THE LIST AND DATABASE -END}*/
/*Form displayed after clicking on EDIT - START*/
if(isset($_GET['edit']))
{
$query=mysql_query('SELECT empid, fname, lname, address, phone, email, designation FROM details where empid='.mysql_real_escape_string((int)$_GET['edit']));
$get_row=mysql_fetch_assoc($query);
$empid = $get_row['empid'];
$fname = $get_row['fname'];
$lname = $get_row['lname'];
$address = $get_row['address'];
$phone = $get_row['phone'];
$email = $get_row['email'];
$designation= $get_row['designation'];
echo '<p><form method="post" action="">
<table border=1 align="center" cellspacing=.3>
<caption>Edit details for '.$fname.' '.$lname.'</caption>
<tr><td>Employee ID:</td><td><input type="text" name="empid" value='.$empid.' readonly="readonly" size=25></td></tr>
<tr><td>FirstName:</td><td><input type="text" name="fname" value='.$fname.' size=25></td></tr>
<tr><td>Last Name:</td><td><input type="text" name="lname" value='.$lname.' size=25></td></tr>
<tr><td>Postal Address:</td><td><textarea name="address" rows=4 size=25>'.$address.'</textarea></td></tr>
<tr><td>Phone number:</td><td><input type="text" name="phone" value='.$phone.' size=25></td></tr>
<tr><td>E-mail address</td><td><input type="text" name="email" value='.$email.' size=25></td></tr>
<tr><td>Designation</td><td><textarea name="designation" rows=4 size=25>'.$designation.'</textarea></td></tr>
<tr><td><input type="submit" value="Save to database" name="submit"></td><td><a href="index.php">Cancel all changes</a></td></tr>
</table>
</form></p>';
}
/* FORM to add a new value start*/
if(isset($_GET['add']))
{
echo '<p><form method="post" action="">
<table border=1 align="center" cellspacing=.3>
<caption>Add details of a new Employee</caption>
<tr><td>FirstName:</td><td><input type="text" name="fname" size=25></td></tr>
<tr><td>Last Name:</td><td><input type="text" name="lname" size=25></td></tr>
<tr><td>Postal Address:</td><td><textarea name="address" rows=4 size=25></textarea></td></tr>
<tr><td>Phone number:</td><td><input type="text" name="phone" size=25></td></tr>
<tr><td>E-mail address</td><td><input type="text" name="email" size=25></td></tr>
<tr><td>Designation</td><td><textarea name="designation" rows=4 size=25></textarea></td></tr>
<tr><td><input type="submit" value="Add to database" name="add"></td><td><a href="index.php">Cancel all changes</a></td></tr>
</table>
</form></p>';
}
/*FORM to add a new value end*/
/*Form displayed after clicking on EDIT - END*/
if(empty($_POST) === false)
{
if(isset($_POST['submit']) && $_POST['submit']='Save to database')
{
$err = 'No';
$empid = $_POST['empid'];
$fname = $_POST['fname'];
$lname = $_POST['lname'];
$address = $_POST['address'];
$phone = $_POST['phone'];
$email = $_POST['email'];
$designation= $_POST['designation'];
if(empty($empid)=== true || empty($fname)=== true || empty($lname)=== true || empty($address)=== true || empty($phone)=== true || empty($email)=== true || empty($designation)=== true)
{
echo '<p align="center">* All fields are mandatory</p>';
$err='Yes';
}
else
{
if (ctype_alpha($fname) === false || ctype_alpha($lname) === false)
{
echo '<p align="center">* Please enter a valid name.</p>';
$err='Yes';
}
if(!is_numeric($phone))
{
echo '<p align="center">* Please enter a valid phone number.</p>';
$err='Yes';
}
if(filter_var($email,FILTER_VALIDATE_EMAIL) === false)
{
echo '<p align="center">* Please enter a valid E-mail address</p>';
$err='Yes';
}
if ($err==='No')
{
mysql_query('UPDATE details set fname="'.mysql_real_escape_string($fname).'", lname="'.mysql_real_escape_string($lname).'", address="'.mysql_real_escape_string($address).'", phone="'.mysql_real_escape_string($phone).'", email="'.mysql_real_escape_string($email).'", designation="'.mysql_real_escape_string($designation).'" where empid='.mysql_real_escape_string((int)$empid));
header('Location:'.$page);
}
}
}
if(isset($_POST['add']) && $_POST['submit']='Add to database')
{
$err = 'No';
$fname = $_POST['fname'];
$lname = $_POST['lname'];
$address = $_POST['address'];
$phone = $_POST['phone'];
$email = $_POST['email'];
$designation= $_POST['designation'];
if(empty($fname)=== true || empty($lname)=== true || empty($address)=== true || empty($phone)=== true || empty($email)=== true || empty($designation)=== true)
{
echo '<p align="center">* All fields are mandatory</p>';
$err='Yes';
}
else
{
if (ctype_alpha($fname) === false || ctype_alpha($lname) === false)
{
echo '<p align="center">* Please enter a valid name.</p>';
$err='Yes';
}
if(!is_numeric($phone))
{
echo '<p align="center">* Please enter a valid phone number.</p>';
$err='Yes';
}
if(filter_var($email,FILTER_VALIDATE_EMAIL) === false)
{
echo '<p align="center">* Please enter a valid E-mail address</p>';
$err='Yes';
}
if ($err==='No')
{
mysql_query("INSERT INTO details (fname, lname, address, phone, email, designation) VALUES('$fname','$lname','$address','$phone','$email','$designation')");
header('Location:'.$page);
}
}
}
if(isset($_POST['search']) && $_POST['search']='search')
{
$name = $_POST['name'];
$query = mysql_query('SELECT empid, fname, lname, address, phone, email, designation FROM details where lname='.$name."'");
echo $name;
if(mysql_num_rows($query) == 0)
{
echo 'There are no records in the database matching your search';
}
else
{
echo '<table border=1 cellpadding=10 cellspacing=.5 bgcolor="33CCCC">
<caption>Search Results for '.$name.'.</caption>
<tr><th>Employee ID</th><th>First Name</th><th>Last Name</th><th>Phone</th><th>Postal Address</th><th>E-Mail</th><th>Designation</th><th>Edit</th><th>Delete</th></tr>';
while($get_row = mysql_fetch_assoc($query))
{
echo '<tr><td>'.$get_row['empid'].'</td><td>'.$get_row['fname'].'</td><td>'.$get_row['lname'].'</td><td>'.$get_row['phone'].'</td><td>'.$get_row['address'].'</td><td>'.$get_row['email'].'</td><td>'.$get_row['designation'].'</td><td><a href="index.php?edit='.$get_row['empid'].'">Modify Details</a></td><td><a href="index.php?delete='.$get_row['empid'].'">Delete entry</a></td></tr>';
}
echo '</table>';
}
}
}
echo '<p align="right"><a href="index.php?add">Add a new value</a></p>';
/* TO DISPLAY DATA STORED IN THE DATABASE -START */
echo '<form action="" method="post">
<p align="right"><input type="text" name="name" size=25>
<input type="submit" name="search" value="search"></p>
</form>';
$query=mysql_query('SELECT empid, fname, lname, address, phone, email, designation FROM details');
if(mysql_num_rows($query) == 0)
{
echo 'There are no records in the database';
}
else
{
echo '<table border=1 cellpadding=10 cellspacing=.5 bgcolor="33CCCC">
<tr><th>Employee ID</th><th>First Name</th><th>Last Name</th><th>Phone</th><th>Postal Address</th><th>E-Mail</th><th>Designation</th><th>Edit</th><th>Delete</th></tr>';
while($get_row = mysql_fetch_assoc($query))
{
echo '<tr><td>'.$get_row['empid'].'</td><td>'.$get_row['fname'].'</td><td>'.$get_row['lname'].'</td><td>'.$get_row['phone'].'</td><td>'.$get_row['address'].'</td><td>'.$get_row['email'].'</td><td>'.$get_row['designation'].'</td><td><a href="index.php?edit='.$get_row['empid'].'">Modify Details</a></td><td><a href="index.php?delete='.$get_row['empid'].'">Delete entry</a></td></tr>';
}
echo '</table>';
}
/* TO DISPLAY DATA STORED IN THE DATABASE -END */
?>
</body>
</html>