拒绝访问用户的mysql_query（）预计参数2是资源

Question

我有问题，这样的代码：

代码

<?php 
include('config.php'); 
?> 

<?php 
if(isset($_POST['add'])) 
{ 

$conn = mysqli_connect($servername, $username, $password); 
if(! $conn) 
{ 
die('Could not connect: ' . mysql_error()); 
} 

if(! get_magic_quotes_gpc()) 
{ 
$name_of_activity = addslashes ($_POST['name_of_activity']); 
$descriotion = addslashes ($_POST['descriotion']); 
} 
else 
{ 
$course_No = $_POST['name_of_activity']; 
$descriotion = $_POST['descriotion']; 
} 
$date = $_POST['date']; 

$sql = "INSERT INTO Activity". "(name_of_activity, descriotion, date)  ". "VALUES('$name_of_activity','$descriotion','$date')"; 
mysql_select_db('ecom'); 
$retval = mysql_query($sql, $conn); 
if(! $retval) 
{ 
die('Could not enter data: ' . mysql_error()); 
} 
echo "Entered data successfully\n"; 
mysql_close($conn); 
} 
else 
{ 
?> 
<form method="post" action="<?php $_PHP_SELF ?>"> 
<table width="400" border="0" cellspacing="1" cellpadding="2"> 
<tr> 
<td width="100">name_of_activity</td> 
<td><input name="name_of_activity" type="text" id="name_of_activity" />    </td> 
</tr> 
<tr> 
<td width="100"> descriotion </td> 
<td><input name="descriotion" type="text" id="descriotion" /></td> 
</tr> 
<tr> 
<td width="100">date </td> 
<td><input name="date" type="text" id="date" /></td> 
</tr> 
<tr> 
<td width="100"> </td> 
<td> </td> 
</tr> 
<tr> 
<td width="100"> </td> 
<td> 
<input name="add" type="submit" id="add" value="Add Activity" /> 
</td> 
</tr> 
</table> 
</form> 
<?php 
} 
?> 

如果我运行它表明此错误消息：

警告：mysql_query（）期望参数2是资源，在第29行中的/Applications/XAMPP/xamppfiles/htdocs/add/add-course.php中给出的对象 无法输入数据：访问被拒绝用户'''localhost'到数据库'ecom'

Answer 1

将mysql更改为mysqli，你完全不能使用mysql和mysqli。

$retval= mysqli_query($conn, $sql);