mysqli::$warning_count
mysqli::$warning_count
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
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