MySQL 函数
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mysql_errno

(PHP 4, PHP 5)

mysql_errno — 返回上一个 MySQL 操作中的错误信息的数字编码

说明

int mysql_errno ([ resource $link_identifier ] )

返回上一个 MySQL 函数的错误号码，如果没有出错则返回 0（零）。

从 MySQL 数据库后端来的错误不再发出警告，要用 mysql_errno() 来提取错误代码。注意本函数仅返回最近一次 MySQL 函数的执行（不包括 mysql_error() 和 mysql_errno()）的错误代码，因此如果要使用此函数，确保在调用另一个 MySQL 函数之前检查它的值。

Example #1 mysql_errno() 例子

<?php
    mysql_connect("localhost", "mysql_user", "mysql_password");

    mysql_select_db("nonexistentdb");
    echo mysql_errno() . ": " . mysql_error(). "\n";

    mysql_select_db("kossu");
    mysql_query("SELECT * FROM nonexistenttable");
    echo mysql_errno() . ": " . mysql_error() . "\n";
?>

以上例子将产生如下输出： 

1049: Unknown database 'nonexistentdb'
1146: Table 'kossu.nonexistenttable' doesn't exist

Note:

如果指定了可选参数则用给定的连接提取错误代码。否则使用上一个打开的连接。

参见 mysql_error()。

MySQL 函数
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PHP手册

用户评论:

timstamp.co.uk (2007-06-25 07:51:49)

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 at paarlberg dot dk (2005-12-13 03:40:00)

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);
}

phpnet at vemconcursos dot com (2005-12-07 18:31:47)

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";
}

admin at artfabrique dot ru (2005-10-18 05:28:52)

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

apoio at cyberspace dot org (2000-06-29 17:58:48)

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.

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