Question

我的网站（远程）上有一个sql server表。该表名为table1，包含一堆字段。我的目标是将table1的所有字段读入名为results的数组中。

这是我的尝试：

 private static void ShowFields()
        {
            using (SqlConnection connection = new SqlConnection(connectionstring))
            {
                connection.Open();

                SqlCommand command = new SqlCommand("SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='table1'", connection);

                string[] results = command.BeginExecuteNonQuery().ToArray();

                connection.Close(); 

                foreach (var v in results)
                {
                    Console.WriteLine(v); 
                }
            }
        }

Answer 1

你想要探索

SqlCommand.ExecuteReader

或用结果填充DataSet。

http://msdn.microsoft.com/en-us/library/bh8kx08z%28v=vs.71%29.aspx

BeginExecuteNonQuery是异步的，我会传递这个，直到你得到基础知识。

Answer 2

您需要使用Sqlcoomand.Executereader()代替：

 private static void ShowFields()
 {
     using (SqlConnection connection = new SqlConnection(connectionstring))
     {
         connection.Open();

         SqlCommand command = new SqlCommand("SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='table1'", connection);
         SqlDataReader reader = command.ExecuteReader();

         connection.Close();

         int colCount = reader.FieldCount;

         while (reader.Read())
         {
             for (int i = 0; i < colCount; i++)
             {
                 Console.WriteLine(reader.GetString(i));
             }
         }
     }
 }

Answer 3

这是另一种方式：

 System.Data.SqlClient.SqlCommand c = new System.Data.SqlClient.SqlCommand();
 System.Data.DataTable T = new System.Data.DataTable();
 System.Data.SqlClient.SqlDataAdapter DA = new System.Data.SqlClient.SqlDataAdapter(c);
 c.commandtext = "select ..";
 DA.SelectCommand = c;
 c.Connection = new System.Data.SqlClient.SqlConnection(yourConnectionString);
 c.Connection.Open();
 DA.Fill(T);
        // close connection in finally block or use the using structure

然后检查T.

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3 个答案: