Question

我有一個php code.here是代碼，我要把它翻譯成.NET，但在某些時候我遇到了一些麻煩。

function processInput($conn, $MessageArray, $mobilenumber, $date, $odd) 
{ 

$strSQLUSER="SELECT * FROM tbl_tiduser WHERE username='".addslashes($MessageArray[0])."' AND stat!='1' AND stat!='4'"; 

$result_user=odbc_exec($conn,$strSQLUSER) or die("Could not connect to database"); 

這裏是轉換後的.NET代碼

public class ProcessInput 
{ 
    private string msg_arr; 
    private string MooseSeenInput(string MobileNo,string Date,string odd,params Array[] msg_arr) 
    { 


SqlCommand com = new SqlCommand("SELECT * FROM tbl_tiduser WHERE username=@username AND stat!='1' AND stat!='4'", mycon); 
        com.Parameters.AddWithValue("@username",username); 
        using (SqlDataReader reader = com.ExecuteReader()) 

    // whats the next part need to come here ??? 

} 

這incomplete.i'm不會編譯....

Answer 1

private static void ReadOrderData(string connectionString) 
{ 
    string queryString = 
     "SELECT OrderID, CustomerID FROM dbo.Orders;"; 

    using (SqlConnection connection = 
       new SqlConnection(connectionString)) 
    { 
     SqlCommand command = 
      new SqlCommand(queryString, connection); 
     connection.Open(); 

     SqlDataReader reader = command.ExecuteReader(); 

     // Call Read before accessing data. 
     while (reader.Read()) 
     { 
      Console.WriteLine(String.Format("{0}, {1}", 
       reader[0], reader[1])); 
     } 

     // Call Close when done reading. 
     reader.Close(); 
    } 
} 

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.aspx

Answer 2

我會使用類似這樣的方式獲取您之後的列：

string username = null; 
using (SqlDataReader reader = com.ExecuteReader()) { 
    if (reader.read()) { 
     username = (string)reader["mydbcolumnname"]; 
    } 
    reader.Close(); 
} 

請注意，如果你想拉的所有結果行（而不是通過他們步進），那麼你通常使用的SqlDataAdapter 向填充DataSet的（而不是閱讀器），如：

string username; 
using (SqlDataAdapter adapter = new SqlDataAdapter(com)) 
{ 
    using (DataSet ds) 
    { 
     adapter.Fill(ds); 
     username = (string)ds.Tables[0].Rows[0]["mycolumnname"]; 
    } 
} 

Answer 3

我很容易;我會寫一個class，反映我讀的記錄，即

public class User { 
    public int Id {get;set;} 
    public string Name {get;set;} 
} 

，並使用"dapper"：

var user = myCon.Query<User>(
    "SELECT * FROM tbl_tiduser WHERE username=@username AND stat not in ('1','4')", 
    new {username}).SingleOrDefault(); 

if(user == null) { /* not found, presumably throw an exception */ } 

string name = user.Name; // etc 

然後，你不需要使用命令，讀卡器，參數等亂（見如何將username乾淨地變成db參數？）。