Fatal error: Uncaught Error: Call to a member function fetch_all() on bool in D:\wwwroot\www.hydljt.com\class\common.php:624 Stack trace: #0 D:\wwwroot\www.hydljt.com\class\ymsc.php(57): 数据库查询('SELECT * FROM `...') #1 D:\wwwroot\www.hydljt.com\class\yd.php(67): require('D:\\wwwroot\\www....') #2 D:\wwwroot\www.hydljt.com\index.php(12): require('D:\\wwwroot\\www....') #3 {main} thrown in D:\wwwroot\www.hydljt.com\class\common.php on line 624