mysqli::stat()

(PHP 5, PHP 7)

获取当前系统状态信息

说明

面向对象风格
mysqli::stat(void): 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

• mysqli_get_server_info() 返回MySQL服务器的版本号

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