PHP mysqli warning_count() 函数
示例 - 面向对象的样式
返回上次查询的警告数:
<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");
// Check connection
if ($mysqli -> connect_errno) {
echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
exit();
}
$mysqli -> query("CREATE TABLE myPersons LIKE Persons");
$sql
= "INSERT INTO myPersons (FirstName) VALUES(
'Hdghfhjgjtjyjn.,,��l�jkghfjbmbngfgffdhfhjgjgkjhlkhlkjljljlkjkljlkjkljkljlkj')";
$mysqli -> query($sql);
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();
}
}
$mysqli -> close();
?>
查看底部的程序样式示例。
定义和用法
warning_count / mysqli_warning_count() 函数返回上次查询的警告数。
语法
面向对象的风格:
$mysqli -> warning_count
程序风格:
mysqli_warning_count(connection)
参数值
| 参数 | 描述 |
|---|---|
| connection | 必需。规定要使用的 MySQL 连接。 |
技术细节
| 返回值: | 上次查询的警告数。 0 如果没有警告 |
|---|---|
| PHP 版本: | 5+ |
示例 - 程序样式
返回上次查询的警告数:
<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();
}
mysqli_query($con, "CREATE TABLE myPersons LIKE Persons");
$sql
= "INSERT INTO myPersons (FirstName) VALUES(
'Hdghfhjgjtjyjn.,,��l�jkghfjbmbngfgffdhfhjgjgkjhlkhlkjljljlkjkljlkjkljkljlkj')";
mysqli_query($con, $sql);
if (mysqli_warning_count($con)) {
if ($result = mysqli_query($con, "SHOW WARNINGS")) {
$row = mysql_fetch_row($result);
printf("%s (%d): %s\n",
$row[0], $row[1], $row[2]);
mysqli_free_result($result);
}
}
mysqli_close($con);
?>
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