摘要：String sql=“select * from user where username=? And password=?”;user属于sql里的关键字，所以会报错，一般不要用关键字作为表名，如果关键字做表名用[]括起来，String sql=“select * from [user] where username=? And password=?”;select * from [user] where id=? and password=?"试试看。sqlserver有个系统表叫 user 阅读全文