IF和while的区别
String SQL1="select HostId from Invites where Emails='"+email+"'";
ResultSet rs1=db.executeQuery(SQL1);
if(rs1.next()){
String HostId=rs1.getString("HostId");
String SQL2="insert into Friends(HostId,GuestManId) values('"+HostId+"','"+UserId+"')";
db.executeInsert(SQL2);
}
为什么把if(rs1.next())改为while(rs1.next())后{} 里的代码就不能够执行了那,