Php/docs/mysqli.warning-count

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mysqli::$warning_count

mysqli_warning_count

(PHP 5, PHP 7)

mysqli::$warning_count -- mysqli_warning_countReturns the number of warnings from the last query for the given link


说明

面向对象风格

int $mysqli->warning_count;

过程化风格

mysqli_warning_count ( mysqli $link ) : int

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
仅以过程化样式:由mysqli_connect()mysqli_init() 返回的链接标识。


返回值

Number of warnings or zero if there are no warnings.


范例

Example #1 $mysqli->warning_count example

面向对象风格


<?php$mysqli = new mysqli("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) {    printf("Connect failed: %s\n", mysqli_connect_error());    exit();}$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();?>

过程化风格


<?php$link = mysqli_connect("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) {    printf("Connect failed: %s\n", mysqli_connect_error());    exit();}mysqli_query($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);?>

以上例程会输出:


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

参见