Async Command Object Demo : SqlCommand « ADO.Net « C# / CSharp Tutorial






  1. C# / CSharp Tutorial
  2. ADO.Net
  3. SqlCommand
using System;
using System.Collections.Generic;
using System.Text;

using System.Data;
using System.Data.SqlClient;
using System.Threading;

  class Program
  {
    static void Main(string[] args)
    {
      SqlConnection cn = new SqlConnection();
      cn.ConnectionString = @"Data Source=(local)\SQLEXPRESS;Integrated Security=SSPI;Initial Catalog=YourDB;Asynchronous Processing=true";
      cn.Open();
      string strSQL = "WaitFor Delay '00:00:20';Select * From Inventory";
      SqlCommand myCommand = new SqlCommand(strSQL, cn);
      IAsyncResult itfAsynch = myCommand.BeginExecuteReader(CommandBehavior.CloseConnection);
      while (!itfAsynch.IsCompleted)
      {
        Thread.Sleep(1000);
      }
      SqlDataReader myDataReader = myCommand.EndExecuteReader(itfAsynch);
      while (myDataReader.Read())
      {
        Console.WriteLine("-> Make: {0}, PetName: {1}, Color: {2}.",
          myDataReader["Make"].ToString().Trim(),
          myDataReader["PetName"].ToString().Trim(),
          myDataReader["Color"].ToString().Trim());
      }
      myDataReader.Close();
    }
  }








32.18.SqlCommand
32.18.1.Create a SqlCommand
32.18.2.Create SqlCommand with both sql query and connection
32.18.3.SqlCommand: AutoClose
32.18.4.Execute two sql commands
32.18.5.Asynchronous Processing Sql command
32.18.6.Start process of retrieving a data reader asynchronously, check the IsCompleted property value.
32.18.7.SqlCommand with Callback Handler
32.18.8.Add parameters to the SqlCommand
32.18.9.SQL StoredProcedure
32.18.10.Execute Scalar with SqlCommand
32.18.11.Execute the scalar SQL statement and store results
32.18.12.Executing a Parameterized Query with SqlCommand
32.18.13.Batch Update Demo
32.18.14.Execute update statement with SqlCommand against MDF file
32.18.15.Executing a Query That Returns a Single Value
32.18.16.Async Command Object Demo