java – 状态无效,ResultSet对象关闭

我正在运行代码,但是得到“无效状态,ResultSet对象已关闭”.错误.是什么导致错误？

try{
    query = "SELECT * FROM BUNDLE_TEMP "
                  + "MINUS "
                  + "SELECT * FROM BUNDLE";

            rs = stmt.executeQuery(query);

            while (rs.next()){
                String bundle = rs.getString("BUNDLE");
                String week = rs.getString("WEEK");
                String sched_dt = rs.getString("SCHED_DT").replace(" 00:00:00.0", "");
                String dropper_id = rs.getString("DROPPER_ID");


                query = "INSERT INTO BUNDLE "
                            + "VALUES ('"
                                + bundle+"','"
                                + week+"','"
                                + sched_dt+"','"
                                + dropper_id+"')";

                stmt.executeUpdate(query);
            }
        }catch(Exception e){
            System.out.println("Error while trying to insert into BUNDLE\n"+query+"\n"+ e);
        }

解决方法:

您无法在当前使用ResultSet迭代的同一语句上执行另一个SQL查询.这样做将关闭先前打开的游标(您的SELECT查询和ResultSet)：

引用API docs for Statement：

By default, only one ResultSet object per Statement object can be open
at the same time. Therefore, if the reading of one ResultSet object is
interleaved with the reading of another, each must have been generated
by different Statement objects. All execution methods in the Statement
interface implicitly close a statment’s current ResultSet object if an
open one exists.

从Connection创建另一个Statement实例,让我们在那个上调用updateStmt和executeUpdate().

另外,请查看Prepared Statements以获取更新,它可能会更高效,更安全.