PHP mysqli warning_count() 函数

示例 - 面向对象风格

返回上次查询的警告数量：

<?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量。

语法

面向对象风格：

$mysqli -> warning_count

程序风格：

mysqli_warning_count( connection)

参数值

Parameter	Description
connection	Required. Specifies the MySQL connection to use

技术细节

返回值：	上次查询的警告数。如果没有警告则为 0
PHP 版本：	5+

示例 - 程序风格

返回上次查询的警告数量：

<?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);
?>

❮ PHP MySQLi 参考