mysql_errno()

(PHP 4, PHP 5)

返回上一个 MySQL 操作中的错误信息的数字编码

说明

mysql_errno([resource $link_identifier]): int

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()。

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().

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.

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);
 }