mysqli::$warning_count
(PHP 5, PHP 7)
mysqli :: $ warning_count - mysqli_warning_count - 返回给定链接上一次查询的警告数
Description
面向对象的风格
int $mysqli->warning_count;
程序风格
int mysqli_warning_count ( mysqli $link )返回连接中最后一个查询的警告数量。
注意：要检索警告消息，可以使用SQL命令SHOW WARNINGS limit row_count。
Parameters
`link` 仅过程样式：由mysqli_connect()或mysqli_init()返回的链接标识符
Return Values
如果没有警告则警告的数量为零。
Examples
Example #1 $mysqli->warning_count example
面向对象的风格
<?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();
?>程序风格
<?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);
?>上面的例子会输出：
Warning (1264): Data truncated for column 'Name' at row 1 © 1997–2017 The PHP Documentation Group根据知识共享署名许可证v3.0或更高版本授权。
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