CSqlStatement *stcity = sqlite.Statement(_T("SELECT city FROM timezone WHERE country = "+"'"+selcountry+"'")); 
该语句中selcountry是变量，查询语句单独写如下：
SELECT city FROM timezone WHERE country = '变量'
请指教

CString temp;
temp.Format("SELECT city FROM timezone WHERE country = '%s'", selcountry);

或者用sprintf也可以。

CString::Format