java - 尝试查询我的数据库并将结果传递到一个对象中，然后传递到前面、mysql 和 java

Question

所以目前我试图查询我的数据库并提取所有结果，使它们成为一个对象，然后将对象推送到对象数组中，我无法正常工作。

具有我的方法的工作对象如下

public class Table {

    public List<Car> getTableConnection() throws ClassNotFoundException, SQLException {
        Work work = new Work();
        ResultSet result = null;
        Statement sp = null;
        Connection conn = null;
        ResultSet rs = null;
        List<Car> cars = new ArrayList<>();

        try {
            work.createConnection();
            sp = conn.createStatement();
            conn.setAutoCommit(false);
            result = sp.executeQuery("SELECT * FROM cardetails");
            while (result.next()) {
                Car car = new Car();
                car.setId(result.getInt("id"));
                car.setYear(result.getString("Year"));
                car.setMake(result.getString("Make"));
                car.setModel(result.getString("Model"));
                car.setColor(result.getString("Color"));
                car.setAvailable(result.getString("Availability"));
                cars.add(car);
            }
        } catch (Exception e) {

        } finally {

        }
        return cars;
    }
}

当我要从 JSP 上拉出这些对象时，我正在这样做。

<%  
    Table table = new Table();
    table.getTableConnection();
    List<Car> cars = table.getTableConnection();
    String renting;
    for (Car c : cars) {
        int id = c.getId();
        String year = c.getYear();
        String make = c.getMake();
        String model = c.getModel();
        String color = c.getColor();
        String avail = c.getAvailable();
    }
%>

目前我没有收到任何错误，但在查询数据库时我得到的结果似乎什么也没有。

Answer 1

public class Table {

public List<Car> getTableConnection() throws ClassNotFoundException, SQLException {
    Work work = new Work();
    ResultSet result = null;
    Statement sp = null;
    Connection conn = null;
    ResultSet rs = null;
    List<Car> cars = new ArrayList<>();

    try {
        **conn =work.createConnection();**
        sp = conn.createStatement();
        conn.setAutoCommit(false);
        result = sp.executeQuery("SELECT * FROM cardetails");
        while (result.next()) {
            Car car = new Car();
            car.setId(result.getInt("id"));
            car.setYear(result.getString("Year"));
            car.setMake(result.getString("Make"));
            car.setModel(result.getString("Model"));
            car.setColor(result.getString("Color"));
            car.setAvailable(result.getString("Availability"));
            cars.add(car);
        }
    } catch (Exception e) {

    } finally {

    }
    return cars;
}

}