Warning: mysqli_query() expects parameter 1 to be mysqli, boolean given in /www/wwwroot/3707pp.com/hou/456/shu.php on line 8

Warning: mysqli_error() expects parameter 1 to be mysqli, boolean given in /www/wwwroot/3707pp.com/hou/456/shu.php on line 8
数据库连接错误！错误信息：select count(id) as shu from wen where zong=21 and nian like'%2020%' and ( di like'%俄%' ) and ( yu like'%韩%' )