返回字符串從SQL程序到C＃

Question

我有一個SQL創建這樣

USE KOST 
    GO 
    --Cabang means Branch in Bahasa. 

CREATE PROCEDURE login_pro 
     --received parameter 
     @NoIDStaff VARCHAR(5), 
     @Password VARCHAR (50) 


    AS 

    --sent parameter 
    DECLARE @status INT 
    DECLARE @IDCabang VARCHAR(5) 

    --owner login 
    IF EXISTS(SELECT IDCabang, [Password] 
       FROM MsStaff 
       WHERE @NoIDStaff=NoIDStaff AND @Password=[Password] 
       AND NoIDStaff LIKE('B%')) 
      SET @status=1 

    --staff login 
    ELSE IF EXISTS(SELECT IDCabang, [Password] 
       FROM MsStaff 
       WHERE @NoIDStaff=NoIDStaff AND @Password=[Password] 
       AND NoIDStaff LIKE('A%')) 
      BEGIN 
      SELECT @IDCabang=IDCabang FROM MsStaff 
      SET @status=2 
      SET @IDCabang = (select IDCabang FROM Msstaff where @NoIDStaff=NoIDStaff AND @Password=[Password] 
       AND NoIDStaff LIKE('A%')) 
      END 

    --neither of them login 
    ELSE 
      set @status=0 

    select @status, @IDCabang 
    GO 

查詢返回的狀態值而不是IDCabang程序查詢。 我應該怎麼做才能返回IDCabang的價值？

這是我的C＃代碼：

private void submit_Click(object sender, EventArgs e) 
    { 
     NoIDStaff = new SqlParameter(); 
     Password = new SqlParameter(); 
     SqlConnection con = new SqlConnection(strCon); 

     com = new SqlCommand(); 
     com.Connection = con; 
     con.Open(); 

     com.CommandType = CommandType.StoredProcedure; 
     com.CommandText = "login_pro"; 

     NoIDStaff.SqlDbType = SqlDbType.VarChar; 
     NoIDStaff.Size = 50; 
     NoIDStaff.ParameterName = "@NoIDStaff"; 
     NoIDStaff.Value = username.Text.ToString(); 
     NoIDStaff.Direction = ParameterDirection.Input; 

     Password.SqlDbType = SqlDbType.VarChar; 
     Password.Size = 50; 
     Password.ParameterName = "@Password"; 
     Password.Value = password.Text.ToString(); 
     Password.Direction = ParameterDirection.Input; 

     com.Parameters.Add(NoIDStaff); 
     com.Parameters.Add(Password); 



     int status; 
     string IDCabang; 
     status = Convert.ToInt16(com.ExecuteScalar()); 
     IDCabang = Convert.ToString(com.ExecuteScalar()); 


     //owner login 
     if (status == 1) 
     { 
      this.Hide(); 
      frm = new Form2(); 
      frm.Show(); 
     } 

     //staff login 
     else if (status == 2) 
     { 
      this.Hide(); 
      frm4 = new Form4(IDCabang); 
      frm4.Show(); 
     } 


     else if (username.Text.Equals("")) 
     { 
      MessageBox.Show("Username Must be Filled!", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     } 

     else if (password.Text.Equals("")) 
     { 
      MessageBox.Show("Password Must be Filled!", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     } 

     else 
     { 
      MessageBox.Show("Invalid Username or Password", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     } 

     con.Close(); 
    } 

我想收到IDCabang爲字符串，所以我可以將它發送到Form4。但看起來，IDCabang沒有返回任何價值。

Answer 1

試試這個

SqlDataReader reader = com.ExecuteReader(); 

while (reader.Read()) 
{ 
    status = reader["Status"] == DBNull.Value ? 0 : (int)reader["Status"]; 
    IDCabang = reader["IDCabang"] == DBNull.Value ? null : (string)reader["IDCabang"]; 
} 

Answer 2

你嘗試這樣的：

USE KOST 
    GO 
    --Cabang means Branch in Bahasa. 

CREATE PROCEDURE login_pro(@IDCabang VARCHAR(5)) 
     --received parameter 
     @NoIDStaff VARCHAR(5), 
     @Password VARCHAR (50) 


    AS 

    --sent parameter 
    DECLARE @status INT 


    --owner login 
    IF EXISTS(SELECT IDCabang, [Password] 
       FROM MsStaff 
       WHERE @NoIDStaff=NoIDStaff AND @Password=[Password] 
       AND NoIDStaff LIKE('B%')) 
      SET @status=1 

    --staff login 
    ELSE IF EXISTS(SELECT IDCabang, [Password] 
       FROM MsStaff 
       WHERE @NoIDStaff=NoIDStaff AND @Password=[Password] 
       AND NoIDStaff LIKE('A%')) 
      BEGIN 
      SELECT @IDCabang=IDCabang FROM MsStaff 
      SET @status=2 
      SET @IDCabang = (select IDCabang FROM Msstaff where @NoIDStaff=NoIDStaff AND @Password=[Password] 
       AND NoIDStaff LIKE('A%')) 
      END 

    --neither of them login 
    ELSE 
      set @status=0 

    select @status, @IDCabang 
    GO 

又見THIS

Answer 3

您使用的ExecuteScalar，這是永遠只能去看看你的回報集的第一行和第一列：http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executescalar.aspx

你真的想要使用ExecuteReader或類似的東西。另外，我會在選擇中將變量別名，以便在查找它們時可以更輕鬆地引用它們（即SELECT @status as Status, @IDCabang as IDCabang）。

SqlDataReader reader = com.ExecuteReader(); 

while (reader.Read()) 
{ 
    status = reader["Status"] == DBNull.Value ? 0 : (int)reader["Status"]; 
    IDCabang = reader["IDCabang"] == DBNull.Value ? null : (string)reader["IDCabang"]; 
} 

編輯：在參考Aaron Bertrand的評論，你也可以設置一個輸出參數在你的存儲過程和讀取。有一個關於如何做到這一點在這裏詳細：Get output parameter value in ADO.NET