如何從c＃執行T-SQL？

Question

任何人都可以舉一個使用C＃執行T-SQL語句的例子嗎？

Answer 1

我建議你開始與ADO.NET turorial這樣一個

http://www.csharp-station.com/Tutorials/AdoDotNet/Lesson01.aspx

如何使用SqlCommand的

http://www.csharp-station.com/Tutorials/AdoDotNet/Lesson03.aspx

Answer 2

你的意思是這樣的：

private static void ReadOrderData(string connectionString) 
{ 
     string commandText = "SELECT OrderID, CustomerID FROM dbo.Orders;"; 
     using (SqlConnection connection = new SqlConnection(connectionString)) 
     { 
      using (SqlCommand command = new SqlCommand(commandText, connection)) 
      { 
        connection.Open(); 
        using (SqlDataReader reader = command.ExecuteReader()) 
        { 
         while (reader.Read()) 
         { 
           Console.WriteLine(String.Format("{0}, {1}", 
           reader[0], reader[1])); 
         } 
        } 
      } 
     } 
} 

或者，每HAPS是這樣的：

static public int AddProductCategory(string newName, string connString) 
{ 
    Int32 newProdID = 0; 
    string sql = 
     "INSERT INTO Production.ProductCategory (Name) VALUES (@Name); " 
     + "SELECT CAST(scope_identity() AS int)"; 
    using (SqlConnection conn = new SqlConnection(connString)) 
    { 
     SqlCommand cmd = new SqlCommand(sql, conn); 
     cmd.Parameters.Add("@Name", SqlDbType.VarChar); 
     cmd.Parameters["@Name"].Value = newName; 
     try 
     { 
      conn.Open(); 
      newProdID = (Int32)cmd.ExecuteScalar(); 
     } 
     catch (Exception ex) 
     { 
      Console.WriteLine(ex.Message); 
     } 
    } 
    return (int)newProdID; 
} 

來源：MSDN

Answer 3

使用閱讀器：

SqlConnection MSSQLConn = new SqlConnection("your connection string"); 
MSSQLConn.Open(); 
SqlCommand MSSQLSelectConsignment = new SqlCommand(); 
MSSQLSelectConsignment.CommandText = "select * from yourtable where blah = @blah"; 
MSSQLSelectConsignment.Parameters.AddWithValue("@blah", somestring); 
MSSQLSelectConsignment.Connection = MSSQLConnOLD; 
SqlDataReader reader = MSSQLSelectConsignment.ExecuteReader(); 

while (reader.Read()) 
{ 
... 
} 

要帶回一個值：

MSSQLSelectConsignment.CommandText = "select fieldname from yourtable where blah = @blah"; 
string yourstring = MSSQLSelectConsignment.ExecuteScalar().ToString(); 

或帶回的行數影響更新等：

MSSQLSelectConsignment.CommandText = "update yourtable set yourfield = 0 where blah = @blah"; 
int yourint = MSSQLSelectConsignment.ExecuteNonQuery(); 

希望幫助:)