mysqli::$connect_errno()

(PHP 5, PHP 7)

Returns the error code from last connect call

说明

面向对象风格
int $mysqli->connect_errno;

过程化风格
mysqli_connect_errno(void): int

Returns the last error code number from the last call to mysqli_connect().

Note:

Client error message numbers are listed in the MySQLerrmsg.hheader file, server error message numbers are listed inmysqld_error.h. In the MySQL source distribution you can find a complete list of error messages and error numbers in the fileDocs/mysqld_error.txt.

返回值

An error code value for the last call to mysqli_connect(), if it failed. zero means no error occurred.

范例

Example #1$mysqli->connect_errnoexample

面向对象风格

<?php
$mysqli = @new mysqli('localhost', 'fake_user', 'my_password', 'my_db');
if ($mysqli->connect_errno) {
    die('Connect Error: ' . $mysqli->connect_errno);
}
?>

过程化风格

<?php
$link = @mysqli_connect('localhost', 'fake_user', 'my_password', 'my_db');
if (!$link) {
    die('Connect Error: ' . mysqli_connect_errno());
}
?>

以上例程会输出：

Connect Error: 1045

参见

• mysqli_connect()别名 mysqli::__construct
• mysqli_connect_error() Returns a string description of the last connect 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 SQL 操作的 SQLSTATE 错误信息

'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

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.