mysql_errno

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。

例子 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

注: 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()。

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simon at paarlberg dot dk
13-Dec-2005 07:40


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
08-Dec-2005 10:31


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
18-Oct-2005 08:28


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
30-Jun-2000 08:58


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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