'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
Description
Object-oriented style
Procedural style
mysqli_connect_errno(): int
Returns the error code from the last connection attempt.
Parameters
This function has no parameters.
Return Values
An error code for the last connection attempt, if it failed. Zero means no error occurred.
Examples
Example #1 $mysqli->connect_errno example
Object-oriented style
<?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);
}Procedural style
<?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());
}See Also
- mysqli_connect() - Alias of mysqli::__construct
- mysqli_connect_error() - Returns a description of the last connection error
- mysqli_errno() - Returns the error code for the most recent function call
- mysqli_error() - Returns a string description of the last error
- mysqli_sqlstate() - Returns the SQLSTATE error from previous MySQL operation
add a note
User Contributed Notes 2 notes
Daro AP ¶
9 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.
