Call to a member function fetch_assoc() on a non-object
Here's my function:
function get_fname($un){
$registerquery = $this->conn->query("SELECT f_name FROM tz_members WHERE
usr='".$un."'");
while ($row = $registerquery->fetch_assoc()) {
return $fname = $row[$un];
开发者_运维百科 }
}
Edit:
I chose to answer my own question because it has an editor.
@Mark Baker:
<?php
require_once 'Mysql.php';
$mysql = new Mysql();
?>
<html>
<head>
</head>
<body>
<h4><?php echo $mysql->get_fname("joann"); ?></h4>
</body>
</html>
That's how I am doing it...
It seems that your query failed. Because in that case query returns false. So try this:
$registerquery = $this->conn->query("SELECT f_name FROM tz_members WHERE
usr='".$un."'");
if ($registerquery) {
while ($row = $registerquery->fetch_assoc()) {
return $fname = $row[$un];
}
}
The failure may be caused by a syntax error in your query when $un contains characters that break the string declaration (like ' or \). You should use MySQLi::real_escape_string to escape that characters to prevent that.
Additionally, a function can only return a value once. So the while will be aborted after the first row.
$fname = $row[$un]; is assigning the value in $row[$un] to the variable $fname, then returning the result. It's pointless doing that assignment to $fname because $fname is simply a local variable within the function.... if it's defined as global, then it's not good programming practise.
If echo $mysql->get_fname("joann") is the line where you're calling the get_fname() function, then how are you setting $mysql?
And what do you think will happen if the database query doesn't find any valid result for the query?
while ($row = fetch_assoc($registerquery)) {
return $fname = $row[$un];
}
}
Is it possible you forgot to give a table name in the connection?
$conn = new mysqli('localhost', 'root', 'password', 'ANY VALUE HERE??');
加载中,请稍侯......
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