c# - 多个 SQL 查询 asp.net c#

Question

我需要在一个函数内运行多个查询，是否必须为每个查询创建一个新的 SqlConnection？或者只有一个连接但不同的 SqlCommands 也能工作？

谢谢，

编辑:这行得通吗？

       using (SqlConnection conn = new SqlConnection(connectionString))
      {
        conn.Open();

        using (SqlCommand cmd = new SqlCommand(query1, conn))
        {
            cmd.ExecuteNonQuery();
        }

        using (SqlCommand cmd = new SqlCommand(query2, conn))
        {
            cmd.ExecuteNonQuery();
        }

        using (SqlCommand cmd = new SqlCommand(query3, conn))
        {
            cmd.ExecuteNonQuery();
        }

    }

Answer 1

使用 MDSN Documentation作为基础:

using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();

    string sql1 = "SELECT ID,FirstName,LastName FROM VP_PERSON";
    string sql2 = "SELECT Address,City,State,Code FROM VP_ADDRESS";

    using (SqlCommand command = new SqlCommand(sql1,connection))
    {
        //Command 1
        using (SqlDataReader reader = command.ExecuteReader())
        {
            // reader.Read iteration etc
        }

    } // command is disposed.

    using (SqlCommand command = new SqlCommand(sql2,connection))
    {

        //Command 1
        using (SqlDataReader reader = command.ExecuteReader())
        {
            // reader.Read iteration etc
        }

    } // command is disposed.

   // If you don't using using on your SqlCommands you need to dispose of them 
   // by calling command.Dispose(); on the command after you're done.

} // the SqlConnection will be disposed