控制变量法-初中物理-Nobel Lecture, December 12, 1929-php执行SET GLOBAL connect_timeout=2效果

Posted 2020-08-24 rsapaper

 

 1     $link = mysqli_connect("localhost", "wu", "wp", "wdb");
 2     $sql = \'SET GLOBAL  connect_timeout=2\';
 3     mysqli_query($link, $sql);
 4 
 5     ini_set(\'memory_limit\', \'-1\');
 6     $sql =\'ww\';
 7 $ww =0;
 8     if ($result = mysqli_query($link, $sql)) {
 9         while ($row = mysqli_fetch_assoc($result)) {
10             echo \'<br>\',$ww,\'--\'.time();
11             $ww++;
12         }
13         mysqli_free_result($result);
14     }
15 die();

 

 

 1     $link = mysqli_connect("localhost", "wu", "wp", "wdb");
 2     //$sql = \'SET GLOBAL  connect_timeout=2\';
 3     //mysqli_query($link, $sql);
 4 
 5     ini_set(\'memory_limit\', \'-1\');
 6     $sql =\'ww\';
 7 $ww =0;
 8     if ($result = mysqli_query($link, $sql)) {
 9         while ($row = mysqli_fetch_assoc($result)) {
10             echo \'<br>\',$ww,\'--\'.time();
11             $ww++;
12         }
13         mysqli_free_result($result);
14     }
15 die();

 

 

 

SHOW VARIABLES LIKE \'%out%\';

SET GLOBAL  connect_timeout=31536000;
SHOW VARIABLES LIKE \'%out%\';

SET GLOBAL  connect_timeout=2;
SHOW VARIABLES LIKE \'%out%\';

 

 

Navicat

\'ww\'

 

 

 

root账户 用php、Navicat、\\MySQL\\bin\\mysql.exe 执行 

SET GLOBAL  connect_timeout=420

影响的是每一个database，尽管php连接的是指定的某个库，Navicat是某个库的查询窗口，shell-mysql.exe USE w;