mysqli::stat

mysqli_stat

(PHP 5, PHP 7, PHP 8)

mysqli::stat -- mysqli_stat — 获取当前系统状态信息

说明

面向对象风格

mysqli::stat ( ) : string

过程化风格

mysqli_stat ( mysqli $link ) : string

mysqli_stat() 函数返回一个表示系统状态信息的字符串， 字符串中的内容和 'mysqladmin status' 命令的输出结果类似， 包含以秒为单位的运行时间、运行中的线程数、问题数、重新加载数以及打开的表数量等信息。

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

成功则返回表示系统状态信息的字符串，失败则返回 false。

范例

Example #1 mysqli::stat() 例程

面向对象风格

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* 检查连接 */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

printf ("System status: %s\n", $mysqli->stat());

$mysqli->close();
?>

过程化风格

<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* 检查连接 */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

printf("System status: %s\n", mysqli_stat($link));

mysqli_close($link);
?>

以上例程会输出：

System status: Uptime: 272  Threads: 1  Questions: 5340  Slow queries: 0
Opens: 13  Flush tables: 1  Open tables: 0  Queries per second avg: 19.632
Memory in use: 8496K  Max memory used: 8560K

参见

User Contributed Notes

amosjohlong at hotmail dot com 24-Nov-2016 10:13
Here is an explanation of the values that appear in connection->stat() returned string. It was taken from Ai Hua's April 29, 2006 answer on http://forums.mysql.com/read.php?12,86570,86570.

Uptime--The number of seconds the MySQL server has been running.

Threads--The number of active threads (clients).

Questions--The number of questions (queries) from clients since the server was started.

Slow queries--The number of queries that have taken more than long_query_time seconds.

Opens--The number of tables the server has opened.

Flush tables--The number of flush-*, refresh, and reload commands the server has executed.

Open tables--The number of tables that currently are open.

Queries per second avg--Questions divided by Uptime