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PHP5中文手册
mysqli
PHP Manual

mysqli_error

(PHP 5)

mysqli_error — Returns a string description of the last error

说明

Procedural style:

string mysqli_error ( mysqli $link )

Object oriented style (property)

mysqli
string$error;

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

参数

link

Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

返回值

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

范例

Example#1 Object oriented style

<?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("Errormessage: %s\n", $mysqli->error);
}

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

Example#2 Procedural style

<?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($link, "SET a=1")) {
    printf("Errormessage: %s\n", mysqli_error($link));
}

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

上例将输出：

Errormessage: Unknown system variable 'a'

参见

mysqli
PHP Manual