Ado.Net Tutorial

Presentation
Created By :
Prabhu R
.Net
ADO.Net

Introduction to Ado.net
 Ado stand for Active Database Object.
 Before Ado.net we use Ado to access data from
database. Basically Ado has automatic driver
detection technique and its has only one drawback
that it only provide a connected environment so
efficiency of system may decrease.
 ADO.NET is a new database technology used by
.NET platform (introduced in 2002).
 In fact it is a set of classes used to communicate
between an application front end and a database.
 It supports both connected & disconnection mode of
data access.

Difference between ADO and ADO.NET
ADO ADO.NET
1.It is a COM based library. 1.It is a CLR based library.
2.Classic ADO requires active connection with the
data store.
2.ADO.NET architecture works while the data store is
disconnected.
3.Locking feature is available. 3.Locking feature is not available.
4.Data is stored in binary format. 4.Data is stored in XML.
5.XML integration is not possible. 5.XML integration is possible.
6.It uses the object named Recordset to reference
data from the data store.
6.It uses Dataset Object for data access and
representation.
7.Using Classic ADO, we can obtain information from
one table or set of tables through join. We cannot
fetch records from multiple tables independently.
7.Dataset object of ADO.NET includes collection of
DataTables wherein each DataTable will contain records
fetched from a particular table. Hence multiple table
records are maintained independently.
8.Firewall might prevent execution of Classic ADO.
8.ADO.NET has firewall proof and its execution will never
be interrupted.
9.Classic ADO architecture includes client side cursor
and server side cursor. 9.ADO.NET architecture doesn't include such cursors.
10.We cannot send multiple transactions using a
single connection instance.
10.We can send multiple transactions using a single
connection instance.

Namespaces used in ADO. Net
 System.Data
 It contains the common classes for connecting, fetching data
from database. Classes are like as DataTable, DataSet,
DataView etc.
 System.Data.SqlClient
 It contains classes for connecting, fetching data from Sql
Server database. Classes are like as
SqlDataAdapter,SqlDataReader etc.
 System.Data.OracleClient
 It contains classes for connecting, fetching data from Oracle
database. Classes are like as
OracleDataAdapter,OracleDataReader etc.
 System.Data.OleDb
 It contains classes for connecting, fetching data from any
database(like msaccess, db2, oracle, sqlserver, mysql).
Classes are like as OleDbDataAdapter,OleDbDataReader
etc.
 System.Data.Odbc
 It contains classes for connecting, fetching data from any

Component of ADO.NET
architecture
 The two key components of ADO.NET are
 Data Providers
 DataSet

DataSet
 Basically it is a small Data structure that may
contain multiple datatables from multiple sources.
 The information in dataset is created inform of
XML and is stored with .xsd extention.
 It support disconnected mode of data access.It
has both scrolling mode means forward and
backward scrolling mode (fetching of data).
 DataSet can have multiple Datatable from
multiple sources but DataReader is able toread
only single Datatable.

Creating and using a DataSet
 The typical steps in creating and using a DataSet
are:
 (i)Create a DataSet object
 (ii) Connect to a database
 (iii)Fill the DataSet with one or more tables or views
 (iv)Disconnect from the database
 (v)Use the DataSet in the application

Data Provider
 Data provider is a set of ADO.Net classes that allow us to
access a database. Basically, it is a bridge between our
application (We can say front-end) and data source. There
are following Data Provider :
 SqlServer Data Provider:-It is used to access data from SqlServer
database (for version 7.0 or later).
 Oracle Data Provider:-It is used to access data from oracle
database (for version 8i or later).
 OleDb Data Provider:-It is used to access data from any database
(msaccess, mysql, db2).
 Odbc Data Provider :-It is used to access data from any database
(msaccess, mysql, db2).

 The four Objects from the .Net Framework provides
the functionality of Data Providers in the ADO.NET.
They are
 Connection Object
 Command Object
 Data Reader Object
 Data Adapter Object.

The SQLCONNECTION OBJECT
 The Connection :-The Connection object which
provides a connection to the database

Command Object
 The Command :-The Command object which is
used to execute a command
 It provide three methods which are used to
execute commands on the database:
 ExecuteNonQuery: Executes commands that
have no return values such as INSERT, UPDATE
or DELETE
 ExecuteScalar : Returns a single value from a
database query
 ExecuteReader: Returns a result set by way of a
DataReader object

Data Adapter Object.
 data adapter : The DataAdapter serve as a bridge
between a DataSet and data source for retrieving and
saving data.
 The DataAdapter provides this bridge by using Fill to load
data from the data source into the DataSet and using
Update to send changes made in the DataSet back to the
data source.
 The data adapter objects connect a command objects to a
Dataset object.
 They provide the means for the exchange of data
between the data store and the tables in the DataSet.
 An OleDbDataAdapter object is used with an OLE-DB
provider A SqlDataAdapter object uses Tabular Data
Services with MS SQL Server.

Data Reader Object
 The DataReader:- The DataReader object which
provides a forward-only, read only, connected
recordset
 Limitations of the DataReader
 There is not possible to sort, filter, or manipulate the
data while using a DataReader, since it is read-only
and forward-only.

Differences between DataSet and
DataReader
DataSet DataReader
DataSet object can contain multiple
rowsets from the same data source as
well as from the relationships between
them.
DataReader provides forward-only and
read-only access to data.
Dataset is a disconnected architecture. Datareader is connected architecture.
Dataset can persist data. Datareader can not persist data.
A DataSet is well suited for data that
needs to be retrieved from multiple
tables.
It has live connection while reading
data
DatsSet is slower than DataReader
,Due to overhead.
Speed performance is better in
DataReader

Ado.Net Tutorial

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