mysqli::$warning_count()

(PHP 5, PHP 7)

Returns 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 commandSHOW WARNINGS[limit row_count].

参数

$link

仅以过程化样式：由mysqli_connect()或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_countexample

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

• mysqli_errno() 返回最近函数调用的错误代码
• mysqli_error() Returns a string description of the last error
• mysqli_sqlstate() 返回上一次 SQL 操作的 SQLSTATE 错误信息