[C#] Mssql, Ado.Net 最基本範例

簡單寫一個最簡易Ado.net的資料庫連接，來源是北風資料庫。

private DataTable GetOrdersDataFromDatabase()
{
    // 連接到數據庫，查詢Orders表，返回數據
    string connectionString = "Data Source=.;Initial Catalog=NorthWind;Integrated Security=SSPI;";
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();
        string query = "SELECT * FROM Orders";
        SqlCommand command = new SqlCommand(query, connection);
        SqlDataAdapter adapter = new SqlDataAdapter(command);
        DataTable dataTable = new DataTable();
        adapter.Fill(dataTable);
        return dataTable;
    }
}