java和c#比较（一）jdbc VS ado.net取100万条记录到内存

java代码：

java 复制代码

 String databaseUrl = "jdbc:sqlite:" + selectedFile.getPath();
        ObservableList<ObservableList<Object>> masterData = FXCollections.observableArrayList();

        try (Connection connection = DriverManager.getConnection(databaseUrl)) {
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery("SELECT * FROM H_113_Sheet1");
            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount(); // 获取列的数量

            while (resultSet.next()) {
                ObservableList<Object> row = FXCollections.observableArrayList();
                for (int i = 1; i <= columnCount; i++) {
                    row.add(resultSet.getObject(i));
                }
                masterData.add(row);
            }

        } catch (SQLException e) {
            e.printStackTrace();
        }

c#代码：

cs 复制代码

 string databaseUrl = "Data Source=" + selectedFilePath; 
        List<List<object>> masterData = new List<List<object>>();

        using (SQLiteConnection connection = new SQLiteConnection(databaseUrl))
        {
            connection.Open();
            using (SQLiteCommand command = new SQLiteCommand("SELECT * FROM H_113_Sheet1", connection))
            {
                using (SQLiteDataReader reader = command.ExecuteReader())
                {
                    DataTable schemaTable = reader.GetSchemaTable();
                    int columnCount = schemaTable.Columns.Count;

                    while (reader.Read())
                    {
                        List<object> row = new List<object>();
                        for (int i = 0; i < columnCount; i++)
                        {
                            row.Add(reader.GetValue(i));
                        }
                        masterData.Add(row);
                    }
                }
            }
        }

        catch (SQLiteException e)
        {
            Console.WriteLine(e.ToString());
        }

结论：同样的一个sqlite数据库表，同样一台电脑，单机测试数据读取到内存。

java jdbc ,c# ado.net。

java jdbc：用时26秒，内存占用2.58G。

c# ado.net：用时34秒，内存占用1.68。

就是说取数这项，java内存占用是.net的1.5倍，速度比.net快30%多。