您的位置：寻梦网首页＞编程乐园＞PHP 编程＞PHP5中文手册
PHP5中文手册
mysqli
PHP Manual

mysqli_warning_count

mysqli->warning_count

(PHP 5)

mysqli->warning_count — Returns the number of warnings from the last query for the given link

说明

Procedural style:

int mysqli_warning_count ( mysqli $link )

Object oriented style (property):

mysqli
int$warning_count;

Returns the number of warnings from the last query in the connection.

Note: For retrieving warning messages you can use the SQL command SHOW WARNINGS [limit row_count].

参数

link

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

返回值

Number of warnings or zero if there are no warnings.

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();
}

$mysqli->query("CREATE TABLE myCity LIKE City");

/* a remarkable city in Wales */
$query = "INSERT INTO myCity (CountryCode, Name) VALUES('GBR',
        'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')";

$mysqli->query($query);

if ($mysqli->warning_count) {
    if ($result = $mysqli->query("SHOW WARNINGS")) {
        $row = $result->fetch_row();
        printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
        $result->close();
    }
}

/* 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();
}

mysqli_query($link, "CREATE TABLE myCity LIKE City");

/* a remarkable long city name in Wales */
$query = "INSERT INTO myCity (CountryCode, Name) VALUES('GBR',
        'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')";

mysqli_query($link, $query);

if (mysqli_warning_count($link)) {
    if ($result = mysqli_query($link, "SHOW WARNINGS")) {
        $row = mysqli_fetch_row($result);
        printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
        mysqli_free_result($result);
    }
}

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

上例将输出：

Warning (1264): Data truncated for column 'Name' at row 1

参见

mysqli
PHP Manual