(PHP 5, PHP 7)
mysqli::$connect_errno -- mysqli_connect_errno — Returns the error code from last connect call
面向对象风格
过程化风格
Returns the last error code number from the last call to mysqli_connect().
Note:
Client error message numbers are listed in the MySQL errmsg.h header file, server error message numbers are listed in mysqld_error.h. In the MySQL source distribution you can find a complete list of error messages and error numbers in the file Docs/mysqld_error.txt.
An error code value for the last call to mysqli_connect(), if it failed. zero means no error occurred.
Example #1 $mysqli->connect_errno example
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