Connected Architecture of ADO.NET
The architecture of ADO.net, in which connection must be opened to access the data retrieved from database is called as connected architecture. Connected architecture was built on the classes connection, command, datareader and transaction.
Connected architecture is when you constantly make trips to the database for any CRUD (Create, Read, Update and Delete) operation you wish to do. This creates more traffic to the database but is normally much faster as you should be doing smaller transactions.
Disconnected Architecture in ADO.NET
The architecture of ADO.net in which data retrieved from database can be accessed even when connection to database was closed is called as disconnected architecture. Disconnected architecture of ADO.net was built on classes connection, dataadapter, commandbuilder and dataset and dataview.
Disconnected architecture is a method of retrieving a record set from the database and storing it giving you the ability to do many CRUD (Create, Read, Update and Delete) operations on the data in memory, then it can be re-synchronized with the database when reconnecting. A method of using disconnected architecture is using a Dataset.
DataReader is Connected Architecture since it keeps the connection open until all rows are fetched one by one
DataSet is DisConnected Architecture since all the records are brought at once and there is no need to keep the connection alive
Difference between Connected and disconnected architecture
| Connected | Disconnected |
It is connection oriented.
| It is dis_connection oriented.
|
| Datareader | DataSet |
| Connected methods gives faster performance |
Disconnected get low in speed and performance.
|
| connected can hold the data of single table | disconnected can hold multiple tables of data |
connected you need to use a read only forward only data reader
| disconnected you cannot |
Data Reader can't persist the data
| Data Set can persist the data
|
It is Read only, we can't update the data.
| We can update data
|
Example
Create Database “Student”
CREATE TABLE [dbo].[Student]
(
[ID] [int] PRIMARY
KEY IDENTITY(1,1) NOT NULL,
[Name] [varchar](255) NULL,
[Age] [int] NULL,
[Address] [varchar](255) NULL
)
INSERT INTO Student([Name],[Age],[Address])VALUES('NAME 1','22','PUNE')
INSERT INTO Student([Name],[Age],[Address])VALUES('NAME 2','25','MUMBAI')
INSERT INTO Student([Name],[Age],[Address])VALUES('NAME 3','23','PUNE')
INSERT INTO Student([Name],[Age],[Address])VALUES('NAME 4','21','DELHI')
INSERT INTO Student([Name],[Age],[Address])VALUES('NAME 5','22','PUNE')
HTML
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1"
runat="server">
<title>Untitled
Pagetitle>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" BackColor="White" BorderColor="#CC9966"
BorderStyle="None" BorderWidth="1px" CellPadding="4">
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<RowStyle BackColor="White" ForeColor="#330099" />
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
</asp:GridView>
<br />
<asp:Button ID="Connected" runat="server" OnClick="Connected_Click" Text="Connected" />
<asp:Button ID="Disconnected" runat="server" EnableTheming="False" OnClick="Disconnected_Click"
Text="Disconnected" />
</div>
</form>
</body>
</html>
Code Behind
String StrSQL = "", StrConnection = "";
protected
void Page_Load(object
sender, EventArgs e)
{
StrSQL = "SELECT
* FROM Student";
StrConnection = "Data Source=ServerName;Initial
Catalog=Database;User ID=Username;Password=password";
}
protected
void Connected_Click(object
sender, EventArgs e)
{
using
(SqlConnection objConn = new SqlConnection(StrConnection))
{
SqlCommand
objCmd = new SqlCommand(StrSQL,
objConn);
objCmd.CommandType = CommandType.Text;
objConn.Open();
SqlDataReader
objDr = objCmd.ExecuteReader();
GridView1.DataSource = objDr;
GridView1.DataBind();
objConn.Close();
}
}
protected void
Disconnected_Click(object sender, EventArgs e)
{
SqlDataAdapter
objDa = new SqlDataAdapter();
DataSet
objDs = new DataSet();
using
(SqlConnection objConn = new SqlConnection(StrConnection))
{
SqlCommand
objCmd = new SqlCommand(StrSQL,
objConn);
objCmd.CommandType = CommandType.Text;
objDa.SelectCommand = objCmd;
objDa.Fill(objDs, "Student");
GridView1.DataSource =
objDs.Tables[0];
GridView1.DataBind();
}
}
Download
DataSet is disconnected and DataReader is connected. You can correct that inthe table.
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteDon't you think we use DataAdapter in connected architecture?
ReplyDeleteHi,
ReplyDelete• SqlDataAdapter can work with disconnected and connected architecture ,
• SqlDataAdapter can directly update the DB(for instance change in datagridview can directly reflect database table) if used with SqlCommandBuilder
• SqlDataAdapter can fill DataTable,DataSet
• Sqlcommand can use Command.Executereader to read the data(which has better performance then Fill method of DataAdapter)
We can use data adapter in Connected architecture as below
Example
SqlDataAdapter objDa;
DataTable dt;
using (SqlConnection objConn = new SqlConnection(StrConnection))
{
SqlCommand objCmd = new SqlCommand(StrSQL, objConn);
objConn.Open();
objDa = new SqlDataAdapter(objCmd);
dt = new DataTable();
objDa.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();
objConn.Close();
}
Nice effort and really appreciation
ReplyDelete• SqlDataAdapter can work with disconnected and connected architecture ,
ReplyDeletethis line is true ???????
Hi Rahul
ReplyDeleteThis is Saravanan, the notes and example which u posted is very much use full for me. Thank's a lot
Regards
Saravanan.S
in ASP.net projects, when we use Connected & disconnected model
ReplyDeletei.e Command & DataAdapter to update data
Regards
Sreenivas
Use Connected model when:
ReplyDelete• For large / huge amount of data.
• The data is getting changed very frequently
Use Disconnected model when:
• The data is small /less
• It is not changing frequently or the application can handle the changes nevertheless.
• Frequent query to database is either not possible or perhaps is time/resource consuming.
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In ADO.NET, developers can choose between two architectural approaches: connected architecture and disconnected architecture. These approaches determine how the application interacts with the database and manages data.
ReplyDeleteThe connected architecture in ADO.NET involves establishing a continuous connection to the database throughout the application's lifespan. In this approach, the application maintains an open connection to the database, executes queries, Best cameras for streaming, retrieves data, and updates the database in real-time. Any changes made to the data are immediately reflected in the database, and the application can access the latest information.
On the other hand, the disconnected architecture in ADO.NET operates in a disconnected manner. The application establishes a connection to the database only when necessary, retrieves data, and then disconnects from the database. The retrieved data is stored locally in datasets or data tables, allowing the application to work with the data without maintaining a continuous connection to the database. Once the required operations are completed, the application can reconnect to the database to update the changes.
To illustrate this concept, let's consider a commenting website as an example. In the connected architecture, the application establishes a connection to the database at the start and keeps it open throughout the user's session. Whenever a user submits a comment or interacts with the website, best cameras for video, the application directly inserts or updates the data in the database, reflecting the changes immediately. This architecture ensures real-time synchronization between the application and the database.
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