更新
我想插入一条记录，id是变量，userid给定，　其它字段为空，我应该怎样写String sql，特别是逗号，谢谢．　
String sql= "insert into usertab(cardid userid,pwd,usertele,useraddr,)values( ' "+id+ " ', ' "1000 " ', " " " ", " " " ", " " " ", " " " ", " " " ",) ";




[解决办法]
String sql= "insert into usertab(cardid,userid,pwd,usertele,useraddr)values( ' "+id+ " ', '1000 ', ' ', ' ', ' ', ' ', ' ') ";