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PHP : Function Reference : MySQL Functions : mysql_errno

mysql_errno

Returns the numerical value of the error message from previous MySQL operation (PHP 4, PHP 5, PECL mysql:1.0)
int mysql_errno ( [resource link_identifier] )

Example 1423. 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

Code Examples / Notes » mysql_errno

phpnet

Watch out! Although mysql_errno() supposedly returns the error number from the last MySQL function, if you don't specify a link identifier, it assumes the last link *opened*, NOT the last link *used*.
That means you can actually have mysql_errno() blindly ignore the error caused by the last MySQL function if it didn't use the last opened link.
Here's an example:
$link1 = mysql_connect('localhost', 'user1', 'password1');
$link2 = mysql_connect('localhost', 'user2', 'password2');
// do something wrong using the first link
mysql_select_db('nonexistentdb', $link1);
// if you don't specify the link identifier ...
if (mysql_errno()) {
 // the error from the last MySQL function is not reported
 echo mysql_errno() . ': ' . mysql_error() . "\n";
}


timstamp.co.uk

If you are receiving errors like:
Warning: mysql_close(): 5 is not a valid MySQL-Link resource
Check that you are calling mysql_error() and mysql_errno() BEFORE you call mysql_close().


simon

Function for creating unique md5 keys in a database. If there are duplets, then a new md5-key will be generated. For your use:
 function users_md5create($id){
   global $mysql_link;
   while ($done==0) {
     $md5key = md5(time().($id/2).$loop).md5(time().$id.$loop);
     $query = "INSERT INTO users_md5create SET md5key='$md5key', fkey='$id', created=UNIX_TIMESTAMP() ";
     $mysql_result = mysql_query($query, $mysql_link);
     if(mysql_errno($mysql_link)!=1062) $done=1;
     $loop++;
   }

   return($md5key);
 }


apoio

All mysqld error messages are located into the file /usr/local/share/mysql/english/errmsg.txt and listed in numerical order from 999 to 1175. You can change the output language as well, issuing the '-L spanish' option for example. See the manual for more details.

admin

All MySQL ErrorCodes can be found in its' on-line manual.
For lazy one here is the link :
http://dev.mysql.com/doc/refman/5.0/en/error-handling.html


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