SQLException：ResultSet已关闭

Question

我试图执行应该使用数据库中的字段创建新对象的方法，每次运行此代码时，我都会得到SQLException：ResultSet已关闭。

 public DatabasedClient getDatabaseClient(int clientDatabaseid){
    if(DatabaseClientUtil.isInDatabase(clientDatabaseid)){
        return DatabaseClientUtil.getDBClient(clientDatabaseid);
    }else{
        try{
            System.out.println("Trying to find user in db");
            ResultSet rs = fbot.getStorage().query("select * from database_name where clientDBId = " + clientDatabaseid);
            System.out.println("deb " + rs.getString("nick"));
            while (rs.next()) {
                DatabasedClient databasedClient = new DatabasedClient(clientDatabaseid);
                databasedClient.setUid(rs.getString("uid"));
                databasedClient.setNick(rs.getString("nick"));
                databasedClient.setLastConnect(rs.getLong("lastConnected"));
                databasedClient.setLastDisconnect(rs.getLong("lastDisconnect"));
                databasedClient.setTimeSpent(rs.getLong("timeSpent"));
                databasedClient.setLongestConnection(rs.getLong("longestConnection"));
                return databasedClient;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    return null;
}

}

我使用hikari，这里是AbstractStorage类的方法

@Override
public void execute(String query) throws SQLException {
    try (Connection connection = getConnection()){
        connection.prepareStatement(query).executeUpdate();
    }
}

@Override
public ResultSet query(String query) throws SQLException {
    try (Connection connection = getConnection()) {
        return  connection.prepareStatement(query).executeQuery();
    }
}

错误的屏幕截图

我希望有人能帮助我。

Answer 1

我认为您看到的确切错误是由以下代码行引起的：

public class ElectricalDepartmentController {

public void initialize() throws IOException {
        StageAddController stageAddController = new StageAddController();
        stageAddController.setElectricalDepartmentController(this);
        workersTableColumn.setCellValueFactory(new PropertyValueFactory<>("nameSurname"));
        rowSelected();
    }
 @FXML
    public void populateTable() {
        for(Worker worker : workerDao.getWorkersNameSurname("Electrical")) workersList.addAll(worker);
        workersTable.setItems(workersList);
    }

@FXML
    public void refreshButtonClicked() {
        workersList.removeAll(workersList);
        populateTable();
    }
}

在将光标前进到第一条记录之前，您正尝试访问结果集。此外，您的方法System.out.println("deb " + rs.getString("nick")); 返回一个对象，该对象在概念上映射到查询中的单个预期记录。因此，在结果集上迭代一次似乎是有意义的。考虑到所有这些因素，我们可以尝试以下方法：

getDatabaseClient