%t:表名占位符,DB::fetch_first(“SELECT * FROM %t”,array(‘common_member’)); %d:数值占位符,DB::fetch_first(“SELECT * FROM %t WHERE uid=%d”,array(‘common_member’,1));会自动执行intval %s:字符占位符,DB::fetch_first(“SELECT * FROM %t WHERE username=%s”,array(‘common_member’,’管理员’));会自动执行addslashes,转义特殊字符 %n:DB::fetch_all(“SELECT * FROM %t WHERE uid IN(%n)”,array(‘common_member’,array(1,2,3))); %f:同%d类似,只是浮点数,很少用 %i:原样输出,DB::fetch_first(“SELECT * FROM %t WHERE username=’%i'”,array(‘common_member’,’管理员’));