如何傳遞mysql查詢和連接字符串並獲取結果？

Question

我有一個SQL連接字符串是這樣的：

Data Source=myServerAddress;Initial Catalog=myDataBase;User Id=myUsername;Password=myPassword; 

我有這樣的查詢：stratdate = 10-03-2001, Enddate = 20-08-2008

string sql = string.Format(@"SELECT CONCAT(UPPER(SUBSTRING(visit_Status, 1, 1)), SUBSTRING(visit_Status FROM 2)) as Status, COUNT('x') AS Visits 
           FROM visits 
           WHERE visit_Date BETWEEN '{0}' AND '{1}' 
           GROUP BY visit_Status", StartDate.ToString(dateFormat), EndDate.ToString(dateFormat)) 

我不知道如何將這種查詢傳遞到數據庫連接字符串和獲取結果導入數據表。我正在用C＃做WinForms應用程序，並使用MySQL作爲數據庫。

我該怎麼做？有人會對此有任何想法嗎？我如何將這個命令文本傳遞給MySQL？有人會幫我一個示例代碼片段？

Answer 1

public DataTable GetVisits(System.DateTime startDate, System.DateTime endData) 
{ 
    const string SQL = "SELECT CONCAT(UPPER(SUBSTRING(visit_Status, 1, 1)), SUBSTRING(visit_Status FROM 2)) as Status, COUNT('x') AS Visits FROM(visits) WHERE visit_Date BETWEEN @startDate AND @endData GROUP BY visit_Status"; 
    const string CONNSTR = "Data Source=myServerAddress;Initial Catalog=myDataBase;User Id=myUsername;Password=myPassword;"; 
    var tblVisits = new DataTable("Visits"); 
    using (var conn = new MySql.Data.MySqlClient.MySqlConnection(CONNSTR)) { 
     var cmd = new MySql.Data.MySqlClient.MySqlCommand(SQL, conn); 
     var da = new MySql.Data.MySqlClient.MySqlDataAdapter(cmd); 
     var param = new MySql.Data.MySqlClient.MySqlParameter("@startDate", MySql.Data.MySqlClient.MySqlDbType.Date); 
     param.Direction = ParameterDirection.Input; 
     param.Value = startDate; 
     cmd.Parameters.Add(param); 
     param = new MySql.Data.MySqlClient.MySqlParameter("@endDate", MySql.Data.MySqlClient.MySqlDbType.Date); 
     param.Direction = ParameterDirection.Input; 
     param.Value = endData; 
     cmd.Parameters.Add(param); 
     conn.Open(); 
     da.Fill(tblVisits); 
    } 

    return tblVisits; 
}