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