'errmsg.h' and 'mysqld_error.h' files only have the definitions of the error codes. In the MySQL documentation you can find the definition along with the message it displays, which could be more useful since the error constant name isn't always explicit enough.
Client Error Codes and Messages
http://dev.mysql.com/doc/refman/5.6/en/error-messages-client.html
Server Error Codes and Messages
http://dev.mysql.com/doc/refman/5.6/en/error-messages-server.html
mysqli::$connect_errno
mysqli_connect_errno
(PHP 5, PHP 7, PHP 8)
mysqli::$connect_errno -- mysqli_connect_errno — Returns the error code from last connect call
说明
面向对象风格
过程化风格
mysqli_connect_errno(): int
Returns the error code from the last connection attempt.
参数
此函数没有参数。
返回值
An error code for the last connection attempt, if it failed. Zero means no error occurred.
示例
示例 #1 $mysqli->connect_errno example
面向对象风格
<?php
mysqli_report(MYSQLI_REPORT_OFF);
/* @ is used to suppress warnings */
$mysqli = @new mysqli('localhost', 'fake_user', 'wrong_password', 'does_not_exist');
if ($mysqli->connect_errno) {
/* Use your preferred error logging method here */
error_log('Connection error: ' . $mysqli->connect_errno);
}过程化风格
<?php
mysqli_report(MYSQLI_REPORT_OFF);
/* @ is used to suppress warnings */
$link = @mysqli_connect('localhost', 'fake_user', 'wrong_password', 'does_not_exist');
if (!$link) {
/* Use your preferred error logging method here */
error_log('Connection error: ' . mysqli_connect_errno());
}参见
- mysqli_connect() - 别名 mysqli::__construct
- mysqli_connect_error() - Returns a description of the last connection error
- mysqli_errno() - 返回最近函数调用的错误代码
- mysqli_error() - Returns a string description of the last error
- mysqli_sqlstate() - 返回上一次 MySQL 操作的 SQLSTATE 错误
add a note
User Contributed Notes 2 notes
Daro AP ¶
10 years ago
till at etill dot net ¶
8 years ago
As of 5.5.9, connect_errno will not show an error if the host or the user (or both) are empty strings, so such cases have to be accounted for separately.
