java - 从 ResultSet 元数据调用 getColumnCount() 时出错

Question

我在尝试从结果集的元数据中获取列数时似乎遇到了问题。错误是线程“AWT-EventQueue-0”java.lang.IllegalStateException 中的异常:SQLite JDBC:内部状态不一致。

想法是使用此表模型将数据库查询的结果填充到 JTable 中。但是，当我这样做时，出现上述错误。

相关代码为:

public DefaultTableModel buildFlightModel()
            throws SQLException {

         query="SELECT Airline.AirlineName,  Flight.FlightID, Flight.Location, Flight.Destination, Flight.ArriveTime, Flight.LeaveTime FROM Flight INNER JOIN Airline ON Airline.AirlineID=Flight.AirlineID;";

            try {
                Class.forName("org.sqlite.JDBC");
                c = DriverManager.getConnection("jdbc:sqlite:coursework.db");
                stmt = c.createStatement();
                rs=stmt.executeQuery(query);
                while(rs.next()){
                    //System.out.println(s);
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        ResultSetMetaData metaData = rs.getMetaData();

        // names of columns
        Vector<String> columnNames = new Vector<String>();
        int columnCount = metaData.getColumnCount();
        for (int column = 1; column <= columnCount; column++) {
            columnNames.add(metaData.getColumnName(column));
        }

        // data of the table
        Vector<Vector<Object>> data = new Vector<Vector<Object>>();
        while (rs.next()) {
            Vector<Object> vector = new Vector<Object>();
            for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) {
                vector.add(rs.getObject(columnIndex));
            }
            data.add(vector);
        }

        return new DefaultTableModel(data, columnNames);

    }

任何想法/想法/帮助将不胜感激。谢谢。

Answer 1

当 ResultSet.isclose() == true 时抛出此异常。在开始读取循环之前尝试创建 MetaData 的 Clone。