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MySQL 5 C# sample code using ObjectDataSources

, 15 May 2006
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A simple example using MySQL 5 and stored procedures with ObjectDataSources and Generics, in ASP.NET 2.0.

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Introduction

I created this example because I could not find a simple explanation for using MySQL 5 with ObjectDataSources in ASP.NET 2.0.

Let me say, I am really impressed with MySQL. I was able to install it easily on my Windows XP machine and get it running in about an hour. I am a long time MS SQL user, and was very frustrated with trying to use Oracle and Firebird. I realize, the problem is that I am spoiled from MS SQL Server, but hey I'm busy and I like easy to use tools Smile | :)

If you're getting started with MySQL and ASP.NET, then I recommend these steps:

  1. Go to the MySQL website, download and install “Current Release (recommended).
  2. Download and install: MySQL Administrator (to administer your MySQL server, the first download just installs only the server).
  3. Download and install: Connector/Net 1.0 (you need this to get your ASP.NET pages to talk to your MySQL server).
  4. You can also download: MySQL Query Browser – (a graphical client to work with your MySQL databases and run queries).
  5. Read and follow this guide: A Step-by-Step Guide to Using MySQL with ASP.NET.

Using the code

To install the code:

  1. You must have MySQL 5 up and running.
  2. Install MySQL Connector/Net 1.0.
  3. Create a MySQL 5 database named Test.
  4. Create a table in that database called Message:
    CREATE TABLE test.message (
    
        Entry_ID INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
        Name VARCHAR(45),
        Email VARCHAR(45),
        Message VARCHAR(200),
        PRIMARY KEY (Entry_ID)
        )
        AUTO_INCREMENT=32
        CHARACTER SET latin1 COLLATE latin1_swedish_ci;
  5. Create these four MySQL stored procedures in the Test database:
    PROCEDURE `test`.`DeleteMessage`(IN param1 INT)
    BEGIN
    Delete From test.message
    WHERE Entry_ID = param1;
    END
    PROCEDURE `test`.`InsertMessage`(IN param1 VARCHAR(50), IN param2 
        VARCHAR(50), IN param3 VARCHAR(200))
    BEGIN
    INSERT INTO message(Name, Email, Message)
    VALUES(param1,param2,param3);
    END
    PROCEDURE `test`.`ShowAll`()
    BEGIN
    SELECT 
      message.Entry_ID,
      message.Name, 
      message.Email, 
      message.Message
    FROM
      test.message;
    END
    PROCEDURE `test`.`UpdateMessage`(IN paramkey INT, IN param1 VARCHAR(50), 
        IN param2 VARCHAR(50), IN param3 VARCHAR(200))
    BEGIN
    UPDATE    message
    SET              Name = param1, Email = param2, Message = param3
    WHERE     (message.Entry_ID = paramkey);
    END
  6. Unzip "MySQL" and configure IIS to point to it. Make sure you configure the web server to use ASP.NET 2.0.
  7. Open "web.config" and change the line:
    <add name="MySQLConnectionString" connectionString="server=localhost; 
       user id=myuser; password=mypass; database=test; pooling=false;" 
       providerName="MySql.Data.MySqlClient"/>

    to connect to your MySQL database.

  8. Browse to the default.aspx page through IIS.

This is the class that uses Generics to supply the data that is consumed by the ObjectDataSource control:

using System;
using System.Collections.Generic;
using System.Data;
using MySql.Data.MySqlClient;
using System.Configuration;
using System.ComponentModel;

[DataObject(true)]
public static class MessagesDB
{
    private static string GetConnectionString()
    {
        return ConfigurationManager.ConnectionStrings
        ["MySQLConnectionString"].ConnectionString;
    }

    [DataObjectMethod(DataObjectMethodType.Select)]
    public static List<MessageItem> GetMessages()
    {
        MySqlCommand cmd = new MySqlCommand("ShowAll", 
                           new MySqlConnection(GetConnectionString()));
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Connection.Open();
        MySqlDataReader dr = 
           cmd.ExecuteReader(CommandBehavior.CloseConnection);

        List<MessageItem> MessageItemlist = new List<MessageItem>();
        while (dr.Read())
        {
            MessageItem MessageItem = new MessageItem();
            MessageItem.Entry_ID = Convert.ToInt32(dr["Entry_ID"]);
            MessageItem.Message = Convert.ToString(dr["Message"]);
            MessageItem.Name = Convert.ToString(dr["Name"]);
            MessageItem.Email = Convert.ToString(dr["Email"]);
            MessageItemlist.Add(MessageItem);
        }
        dr.Close();
        return MessageItemlist;
    }

    [DataObjectMethod(DataObjectMethodType.Insert)]
    public static void InsertMessage(MessageItem MessageItem)
    {
        MySqlCommand cmd = new MySqlCommand("InsertMessage", 
                           new MySqlConnection(GetConnectionString()));
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.Add(new MySqlParameter("param1", MessageItem.Name));
        cmd.Parameters.Add(new MySqlParameter("param2", MessageItem.Email));
        cmd.Parameters.Add(new MySqlParameter("param3", MessageItem.Message));
        cmd.Connection.Open();
        cmd.ExecuteNonQuery();
        cmd.Connection.Close();
    }

    [DataObjectMethod(DataObjectMethodType.Update)]
    public static int UpdateMessage(MessageItem MessageItem)
    {
        MySqlCommand cmd = new MySqlCommand("UpdateMessage", 
                           new MySqlConnection(GetConnectionString()));
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.Add(new MySqlParameter("paramkey", MessageItem.Entry_ID));
        cmd.Parameters.Add(new MySqlParameter("param1", MessageItem.Name));
        cmd.Parameters.Add(new MySqlParameter("param2", MessageItem.Email));
        cmd.Parameters.Add(new MySqlParameter("param3", MessageItem.Message));
        cmd.Connection.Open();
        int i = cmd.ExecuteNonQuery();
        cmd.Connection.Close();
        return i;
    }

    [DataObjectMethod(DataObjectMethodType.Delete)]
    public static int DeleteMessage(MessageItem MessageItem)
    {
        MySqlCommand cmd = new MySqlCommand("DeleteMessage", 
                new MySqlConnection(GetConnectionString()));
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.Add(new MySqlParameter("param1", MessageItem.Entry_ID));
        cmd.Connection.Open();
        int i = cmd.ExecuteNonQuery();
        cmd.Connection.Close();
        return i;
    }

The class above uses the class "MessageItem" to pass the parameters to and from the ObjectDataSource control:

using System;

public class MessageItem
{
    int _Entry_ID;
    string _Message;
    string _Name;
    string _Email;

    public MessageItem()
    {
    }

    public int Entry_ID
    {
        get
        {
        return _Entry_ID;
        }
        set
        {
        _Entry_ID = value;
        }
    }

    public string Message
    {
        get
        {
            return _Message;
        }
        set
        {
            _Message = value;
        }
    }

    public string Name
    {
        get
        {
            return _Name;
        }
        set
        {
            _Name = value;
        }
    }

    public string Email
    {
        get
        {
            return _Email;
        }
        set
        {
            _Email = value;
        }
    }
}

This is the .aspx file that contains the ObjectDataSource control as well as a GridView for editing data and a DetailsView for inserting a record:

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
   TypeName="MessagesDB" OldValuesParameterFormatString="original_{0}" 
   SelectMethod="GetMessages" DataObjectTypeName="MessageItem" 
   DeleteMethod="DeleteMessage" InsertMethod="InsertMessage" 
   UpdateMethod="UpdateMessage">
</asp:ObjectDataSource>
<br />
<asp:GridView ID="GridView1" runat="server" 
      AutoGenerateColumns="False" 
      DataSourceID="ObjectDataSource1" 
      DataKeyNames="Entry_ID">
 <Columns>
   <asp:BoundField DataField="Entry_ID" HeaderText="Entry_ID" 
           SortExpression="Entry_ID" Visible="False" />
   <asp:CommandField ShowEditButton="True" />
   <asp:CommandField ShowDeleteButton="True" />
   <asp:BoundField DataField="Name" 
         HeaderText="Name" SortExpression="Name" />
   <asp:BoundField DataField="Email" 
         HeaderText="Email" SortExpression="Email" />
   <asp:BoundField DataField="Message" 
         HeaderText="Message" SortExpression="Message" />
 </Columns>
</asp:GridView>
<br />
<strong><span style="text-decoration: underline">
      Insert New Record:</span></strong><br />

<asp:DetailsView ID="DetailsView1" runat="server" 
    AutoGenerateRows="False" BorderStyle="None"
    CellSpacing="5" DataSourceID="ObjectDataSource1" 
    DefaultMode="Insert" GridLines="None"
    Height="50px" Width="300px">
  <Fields>
    <asp:BoundField DataField="Name" HeaderText="Name" />
    <asp:BoundField DataField="Email" HeaderText="Email" />
    <asp:BoundField DataField="Message" HeaderText="Message" />
    <asp:CommandField ButtonType="Button" 
         ShowInsertButton="True" ShowCancelButton="False" />
  </Fields>
</asp:DetailsView>

Note

The assembly "MySql.Data.dll" is in the "/bin" directory so the "MySql.Data.MySqlClient" will work.

I hope this helps!

License

This article, along with any associated source code and files, is licensed under The BSD License

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About the Author

defwebserver
Software Developer (Senior) http://ADefWebserver.com
United States United States
Michael Washington is a Microsoft MVP. He is a ASP.NET and
C# programmer.
He is the founder of
LightSwitchHelpWebsite.com

He has a son, Zachary and resides in Los Angeles with his wife Valerie.

He is the Author of:
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Comments and Discussions

 
QuestionHow to connect to a remote MySQL server using a C# application. Pinmemberhosseinhaddad25-Oct-11 22:58 

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