Question

我有以下课程：

public class Refunds {
    ResultSet dataToHash = null;

    public Refunds (String UrnId) {
        Database db = null;
        CallableStatement callable;
        String query = "select * from testmdb.dbo.ApEdiZcusSaSendFile where SourceID='LAN' and UrnID=?";    

        // Get database connection
        try {
            db = new Database("jdbc/refund");
        } catch (NamingException | SQLException e1) {
            e1.printStackTrace();
        }                        

        // Run the query
        try {
            callable = db.connection.prepareCall(query);
            callable.setString(1, UrnId);
            dataToHash = callable.executeQuery();            

        } catch (SQLException s) {
            System.out.println("A SQL exception was thrown while running the query: ");
            s.printStackTrace();
        } catch (Exception e) {
            System.out.println("A general exception was thrown while running the query: ");
            e.printStackTrace();
        } finally {
            db.closeConnection();
        }                
    }

    public ResultSet getDataToHash() {
        return dataToHash;
    }
}

我这样使用它：

// Get the result set
Refunds refunds = new Refunds(urnId);
ResultSet dataToHash = refunds.getDataToHash();

但是，每次dataToHash都是.closed()。我没有关闭ResultSet。无论问题是什么，我如何修改这些代码，以便在我获得它时，它不会被关闭？

PS - 请忽略我的旧学校System.outs ......

Answer 1

关闭连接，关闭ResultSet。

不是将ResultSet存储在类成员中，而是将其存储在Refunds内的局部变量中，并在从Refunds方法返回并关闭连接之前从中读取所有数据。

当我从我的方法返回时，我的ResultSet总是关闭

1 个答案: