mysqli::$error

mysqli_error

(PHP 5, PHP 7, PHP 8)

mysqli::$error -- mysqli_error — Returns a string description of the last error

说明

面向对象风格

string $mysqli->error;

过程化风格

mysqli_error(mysqli $mysql): string

Returns the last error message for the most recent MySQLi function call that can succeed or fail.

参数

mysql

仅以过程化样式：由 mysqli_connect() 或 mysqli_init() 返回的 mysqli 对象。

返回值

A string that describes the error. An empty string if no error occurred.

示例

示例 #1 $mysqli->error example

面向对象风格

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}

if (!$mysqli->query("SET a=1")) {
printf("Error message: %s\n", $mysqli->error);
}

/* close connection */
$mysqli->close();
?>

过程化风格

<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}

if (!mysqli_query($link, "SET a=1")) {
printf("Error message: %s\n", mysqli_error($link));
}

/* close connection */
mysqli_close($link);
?>

以上示例会输出：

Error message: Unknown system variable 'a'

参见