使用SQL C＃綁定結果準備語句

Question

使用此：

SqlConnection myConnection = new SqlConnection("Data Source=.\\SERVER;Initial Catalog=DB;Integrated Security=True;TrustServerCertificate=True;User Instance=False"); 
myConnection.Open(); 

SqlCommand myCommand = new SqlCommand("SELECT BusinessName FROM Businessess WHERE BusinessID = @Param2", myConnection); 

SqlParameter myParam2 = new SqlParameter("@Param2", SqlDbType.Int, 4); 
myParam2.Value = 1; 
myCommand.Parameters.Add(myParam2); 

MessageBox.Show(myCommand); //How do I bind results to show as string? 

如何準備語句的結果綁定到一個變量，這樣我可以操縱他們？

Answer 1

嘗試這樣的：

using (SqlConnection myConnection = new SqlConnection("Data Source=.\\SERVER;Initial Catalog=DB;Integrated Security=True;TrustServerCertificate=True;User Instance=False")) 
using (SqlCommand myCommand = myConnection.CreateCommand()) 
{ 
    myConnection.Open(); 
    myCommand.CommandText = "SELECT BusinessName FROM Businessess WHERE BusinessID = @Param2"; 
    myCommand.Parameters.AddWithValue("@Param2", myParam2); 
    using (SqlDataReader reader = myCommand.ExecuteReader()) 
    { 
     if (reader.Read()) 
     { 
      string businessName = reader.GetString(reader.GetOrdinal("BusinessName")); 
      MessageBox.Show(businessName); 
     } 
     else 
     { 
      MessageBox.Show(string.Format("Sorry, no business found with id = {0}", myParam2)); 
     } 
    } 
} 

事情需要注意：

• 一次性資源被包裹在using語句，以確保適當的處置，即使在異常
• 簡化參數傳遞給的情況下， SQL命令
• 調用，以便檢索對象允許您閱讀RET的ExecuteReader上的命令urned結果集。