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