This document discusses ADO.Net and how it can be used to access and manipulate database data in ASP.Net applications. It explains that ADO.Net provides a standardized way to connect to databases and perform common data operations. The key components of ADO.Net - such as Connection, Command, and DataReader - are introduced. Examples are also provided showing how to execute SQL queries to retrieve and display data from a database.

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2. ASP.Net using Database
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ASP
.Net
VB
J#
ASP.Net
File
ADO.Net
Objects Database
Web Server
Client
HTTP Request
HTTP Response
Language
Engines

3. ADO.NET
ActiveX Data Objects (ADO) and its .Net version
ADO.Net are Microsoft’s answer to universal data
access - at least for all their languages
ADO.Net insulates the programmer from database
implementation details
Allows you to use SQL and ADO.Net objects to
accomplish most of your data access and
manipulation
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4. ADO.Net Architecture
4Source: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconadonetarchitecture.asp

5. ADO.Net Basics
ADO.Net designed to separate data access from
data manipulation
Two central components of ADO.Net
.Net Framework Data Provider
 Connection
 Command
 DataReader
 DataAdapter
DataSet
 DataTableCollection
 DataRelationCollection
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6. .Net Framework Data Providers
Object Description
Connection Establishes a connection to a specific data
source.
Command Executes a command against a data source.
Exposes Parameters and can execute within
the scope of a Transaction from a
Connection.
DataReader Reads a forward-only, read-only stream of data
from a data source.
DataAdapter Populates a DataSet and resolves updates with
the data source.
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7. ADO.Net Basics
Two .Net Framework providers (by default)
SQL Server for all SQL Server databases
OLE DB for other databases
 Microsoft Access
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8. Displaying Database Data
1. Create a data source and connect it to a database
through ASP.Net data control
2. Create an appropriate data display Web control
3. Link the Web control to the data source
4. Execute the Page
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9. Database SQL
Display all records from Product table
SELECT * FROM Product
Display the record for attribute PCode=120 from
Product table
SELECT * FROM Product WHERE PCode=120
Display PCode, PName, and Price for PCode=120 from
Product table
SELECT PCode, PName, Price FROM Product WHERE
PCode=120
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10. Database SQL
Display PCode, PName, and Price for
PName=‘Monitor’ from Product table
SELECT PCode, PName, Price FROM Product WHERE
PName=‘Monitor’
Display Client#, ClientName from Product table and
Trip#, TripDate, People from Booking table for
Client#=120
SELECT Client.[Client#], Client.ClientName, Booking.
[Trip#], Booking.TripDate, Booking.People FROM
Client INNER JOIN Booking ON Client.[Client#] =
Booking.[Client#] WHERE Client.[Client#]=120
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11. Database SQL
Sum of People from Booking
SELECT Client.[Client#], Client.ClientName,
Sum(Booking.People) AS SumOfPeople FROM Client
INNER JOIN Booking ON Client.[Client#] = Booking.
[Client#] GROUP BY Client.[Client#],
Client.ClientName
Computed attribute
SELECT Product.ProdID, Product.ProdType,
Product.price, Product.stock, [price]*[stock] AS
StockValue FROM Product
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12. Database Query
Creating a String variable that stores a SQL query
Dim s as String
s= “SELECT PCode, PName, Price FROM Product
WHERE PName=‘Monitor’”
A SQL query string that includes variable value
Dim s, m as String
m=“Monitor”
s= “SELECT PCode, PName, Price FROM Product
WHERE PName=‘” & m & “’”
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