MySQL and PHP
Copyright 1997-2021 the PHP Documentation Group.
mysql_errno
Returns the numerical value of the error message from previous MySQL operation
This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
mysqli_errno
|
PDO::errorCode
|
int mysql_errno(resource link_identifier= =NULL);Returns the error number from the last MySQL function.
Errors coming back from the MySQL database backend no longer
issue warnings. Instead, use
mysql_errno
to retrieve the error code. Note that this function only returns
the error code from the most recently executed MySQL function
(not including
mysql_error
and
mysql_errno),
so if you want to use it, make sure you check the value before
calling another MySQL function.
link_identifier
The MySQL connection. If the link identifier is not
specified, the last link opened by
mysql_connect
is assumed. If no such link is found, it will try to
create one as if
mysql_connect
had been called with no arguments. If no connection is
found or established, an E_WARNING
level error is generated.
Returns the error number from the last MySQL function, or
0 (zero) if no error occurred.
Example 6.14 mysql_errno
example
<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password");
if (!mysql_select_db("nonexistentdb", $link)) {
echo mysql_errno($link) . ": " . mysql_error($link). "\n";
}
mysql_select_db("kossu", $link);
if (!mysql_query("SELECT * FROM nonexistenttable", $link)) {
echo mysql_errno($link) . ": " . mysql_error($link) . "\n";
}
?>
The above example will output something similar to:
1049: Unknown database 'nonexistentdb'
1146: Table 'kossu.nonexistenttable' doesn't exist
mysql_error
|
| MySQL error codes |