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mysqli::$warning_count

mysqli_warning_count

(PHP 5, PHP 7, PHP 8)

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

过程化风格

mysqli_warning_count(mysqli $mysql): int

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

注意:

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

参数

mysql

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

返回值

Number of warnings or zero if there are no warnings.

范例

示例 #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

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