1. Module 7: Accessing Data by Using ADO.NET

2. Module Overview Overview of Data Access
Reading and Writing Relational Data
Reading and Writing XML Data

3. Lesson 1: Overview of Data Access
ADO.NET Object Model
XML Data Access
Data Access Namespaces
Choosing a .NET Framework Data Provider
What Are Connected and Disconnected Operations?
Accessing Data by Using the Visual Studio 2005 IDE
Binding Data to Controls
Demonstration: Accessing Data by Using the Visual Studio 2005 IDE

4. Data provider-specific classes Data provider-independent classes
ADO.NET Object Model
ADO.NET
Connected model vs. disconnected model
Data provider interfaces
Data provider-specific classes
Data provider-independent classes
SqlConnection
SqlCommand
SqlDataReader
SqlDataAdapter
DataSet
DataTable

5. XML Data Access
XmlReader 1
XmlWriter 2
XmlDocument
DOM 3
XmlElement

6. Data Access Namespaces
Description
System.Data
Core ADO.NET architecture
System.Data.Common
Shared classes
System.Data.OracleClient
Classes for Oracle
System.Data.OleDb
Classes for OLE-DB-compatible data sources
System.Data.Odbc
Classes for ODBC data sources
System.Data.Sql
Core SQL Server classes
System.Data.SqlClient
Classes for SQL Server version 7.0 and later
data sources
System.Xml
Classes for XML data sources …

7. Choosing a .NET Framework Data Provider
Database
.NET Framework Data Provider for Microsoft SQL Server
SQL Server 7.0 and later
Microsoft Data Engine (MSDE)
.NET Framework Data Provider for OLE DB
SQL Server (SQLOLEDB)
Oracle (MSDAORA)
Microsoft Jet (Microsoft.Jet.OLEDB.4.0)
.NET Framework Data Provider for ODBC
SQL Server
Microsoft ODBC for Oracle
Microsoft Access Driver (*.mdb)
.NET Framework Data Provider for Oracle
Oracle client software version and later

8. AdventureWorks Database AdventureWorks Database
What Are Connected and Disconnected Operations?
Connected model
Disconnected model
DataSet
.NET application
.NET application
Open connection
Open connection
Run commands
Create DataSet
Retrieve results
Close connection
Close connection
Manipulate data
Open connection
AdventureWorks Database
AdventureWorks Database
Update tables
Close connection

9. Accessing Data by Using the Visual Studio 2005 IDE1
On the Data menu, click Add New Data Source 2
Define a new database connection 3
Save the connection string in the app.config file 4
Specify the tables you want in the DataSet 5
Specify a name for the DataSet

10. Binding Data to Controls1
Add a control to a Windows form 2
Choose the data source for the control 3
Add queries to the table adapter, if necessary 4
Write code to fill the table in the DataSet 5
Write code to save the table in the DataSet

11. Demonstration: Accessing Data by Using the Visual Studio 2005 IDE
Create a new data source
Add a DataGridView control and set properties
Bind the DataGridView control to a data source
Update the data source query
Add code to save changes to the data on the FormClosed event
Build and run the application

12. Lab: Accessing Data by Using a DataGridView Control
Exercise 1: Binding Data to Controls in a Form (15 minutes)

13. Lesson 2: Reading and Writing Relational Data
Connecting to a Data Source
Creating and Running ADO.NET Commands
How to Retrieve Data by Using a Data Reader
What Is a Data Adapter?
How to Fill and Access DataSet Data
How to Save a DataSet to a Database
Guidelines for Secure Coding with ADO.NET

14. Connecting to a Data Source
Database
1. Import namespaces
2. Create a Connection object
3. Call the Open method to open the connection
4. Call the Close method to close the connection
.NET Application

15. Creating and Running ADO.NET Commands
Method
Description
ExecuteScalar
Executes a query and returns a single result
ExecuteReader
Executes a query and retrieves rows from a data source
ExecuteNonQuery
Executes a query that performs an action in the database,
and returns the number of rows affected

16. How to Retrieve Data by Using a Data Reader1
Create a connection object 2
Create a command object and specify an SQL query 3
Open the database connection 4
Invoke the ExecuteReader method and obtain a data reader object 5
Use the data reader object to iterate through the result set 6
Close the database connection
.NET Application
Database

17. What Is a Data Adapter? DataSet Database DataAdapter
Invoke Fill method to populate DataSet 1
Invoke Update method to merge changes 2
DataSet
Database
DataTable Object
DataAdapter
Fill Method
Update Method

18. How to Fill and Access DataSet Data1
Import required namespaces 2
Create a SqlDataAdapter object 3
Set the SelectCommand property to an SQL query 4
Create a DataSet object 5
Open the database connection 6
Invoke the Fill method 7
Close the database connection

19. How to Save a DataSet to a Database1
Import required namespaces 2
Create a SqlDataAdapter object 3
Set the command property to an SQL query 4
Create a DataSet object 5
Open the database connection 6
Invoke the update method 7
Close the database connection

20. Guidelines for Secure Coding with ADO.NET
Do not echo user security credentials when opening a connection
Use Windows authentication if possible
Store connection strings in the application configuration file
Encrypt connection strings
Validate user input
Prevent SQL injection attacks
Stored procedures
. . .

21. Lab: Accessing Data by Using ADO.NET Commands
Exercise 1: Creating and Running Simple Commands (30 minutes)
Exercise 2: (OPTIONAL) Creating and Running Query Commands (30 minutes)

22. Lesson 3: Reading and Writing XML Data
How to Read and Write a DataSet as XML Data
How to Read XML Data by Using XmlReader
How to Write XML Data by Using XmlWriter
How to Process XML Data by Using the Document Object Model

23. How to Read and Write a DataSet as XML Data
Save a DataSet as XML
DiffGram
IgnoreSchema
WriteSchema
Load XML into a DataSet
Auto
Fragment
InferSchema
InferTypeSchema
ReadSchema
DataSet

24. How to Read XML Data by Using XmlReader1
Create an XmlReaderSettings object 2
Create an XmlReader object 3
Iterate through the nodes in the XML document 4
Retrieve the value of nodes 5
Close the document

25. How to Write XML Data by Using XmlWriter1
Create an XmlWriterSettings object 2
Create an XmlWriter object 3
Write the start of the XML document 4
Write nodes to the XML document 5
Write the end of the XML document

26. How to Process XML Data by Using the Document Object Model
DOM:
A standard API for reading and writing XML data
Node types include: root, element, child element, and attribute
Operations:
Read the content of XML data
Move randomly around the XML document
Add, modify, clone, and delete content in the XML document
Create a new XML document

27. Lab: Reading and Writing XML Data
Exercise 1: Reading and Writing a DataSet as XML Data (15 minutes)

28. Lab Discussion
What are the four core data providers in the .NET Framework?
What classes can you use to establish a connection to a SQL Server database?
What are the advantages and disadvantages of connected and disconnected operations?
What are the available options for reading and writing XML data?