Chapter 5 Configuring Connections and Connecting to Data

Chapter 5 Lesson 0: ADO.NET introduce Lesson 1: Creating and Configuring Connection Objects Lesson 2: Connecting to Data Using Connection Objects Lesson 3: Working with Connection Po

Chapter 5

Configuring Connections and

Connecting to Data

Week ?

Chapter 5

Lesson 0: ADO.NET introduce

Lesson 1: Creating and Configuring

Connection Objects

Lesson 2: Connecting to Data Using

Connection Objects

Lesson 3: Working with Connection Pools

Lesson 4: Handling Connection Errors

Lesson 5: Enumerating the Available SQL

Servers on a Network

Overview of ADO.NET

with the NET Framework

Introdution to ADO.NET

Universal Data Access (UDA)

Microsoft’s strategy for accessing data for

multiple providers

Goal is to access any type of data from any

application on any type of computer

Introdution to ADO.NET

Technology designed to implement the UDA

concept

Provides an standardized object-oriented

interface

Allows access data from any source

Library functions

Hard to use

Introdution to ADO.NET

ADO.NET

Important Core of the NET Framework

Microsoft’s latest database object model

Data access solution in NET

Allows VB programmers to use a standard

set of objects to refer to data from any

source: SQL Server, Oracle, OLE DB &

ODBC (UDA…)

ActiveX Data Objects    ADO

ActiveX Data Objects    ADO

Power of ADO.NET

NET framework is integrated with XML, stored and transferred in

XML

 Can save and load from XML

 XML is the way to exchange data between business

any programming language use it.

Create XML Schema

Good use in multitier applications

Disconnected dataset

Introdution to ADO.NET

XML is an industry standard format for storing and

transferring data over multiple platforms.

XML is an industry standard format for storing and

transferring data over multiple platforms.

ADO.NET and XML

Working together in n-tier architech

Introdution to ADO.NET

.NET Data Provider Objects

SelectCommand InsertCommand UpdateCommand DeleteCommand

Connection NET Data Provider

Command Data Adapter

DataReader

Generic classes

Connection

Command.

DataReader

DataAdapter

DataSet

Core ADO.NET Namespaces

System.Data

System.Data.OleDb

System.Data.SqlClient

Importing the ADO.NET

Namespaces

Needed to build a data access application

For OLE DB: (MS Access)

Imports System.Data

Imports System.Data.OleDB

For SQL Server:

Imports System.Data

Imports System.Data.SQLClient

Lesson 1: Creating and Configuring Connection

Objects

What Is a Connection Object?

What Is a Connection Object?

Connection classes

How to create connection?

Creating Connections in Server Explorer

Lab: P206

Creating Connections Using Data Wizards

Lab: P207

Creating Connection Objects

Programmatically

 (see next page)

How to create connection?

Creating Connection Objects

Programmatically (page 204-205)

Connection properties

Connection methods

And … Questions?

Lesson 2: Connecting to Data Using

Connection Objects

Opening and Closing Data Connections

Connection Events

Opening and Closing Data

Connections

Open and Close methods

Connection must contain a valid connection

string

State of the connection change

Connection Events

Connection open and close method

When

Exer: Open and Close methods.

Lab page 213

Questions

Connect to SQL Server

Connect to MS Access

Lesson 3: Working with Connection

Pools

What Is Connection Pooling?

Controlling Connection Pooling Options

Configuring Connections to Use Connection

Pooling

What Is Connection Pooling?

Reuse of existing connections

Reduce the overhead when creating and

disposing of connections

Connections have the same configuration

Each time call SqlConnection.Open with a

unique connection string, a new pool is

created

Controlling Connection Pooling

Options

is enabled by default when creating

ADO.NET connection

set Pooling=False in your connection string

Connection Pooling Connection String

Keywords (Page 227)

 Min Pool Size, Max Pool Size

Configuring Connections to Use

Connection Pooling (page 229)

Configuring Connection Pooling with SQL Server

Connections

 Manual config

 Data Source=SqlServerName;Initial

Catalog=DatabaseName; Integrated Security=True;Min

Pool Size=5

Configuring Connection Pooling with OLE DB

Connections

 Automatic by Provider

 Provider=Microsoft.Jet.OLEDB.4.0;Data

Source=C:\DataSources\Nwind.mdb;OLE DB Services=-1

 (See page 229)

 DEMO POOL with SQLSERVER

Lesson 4: Handling Connection Errors

Handle exceptions when connecting to a

database

Use the SqlException (OLEDBException)

class to detect connection errors

Use the SqlError (OleDBError) class to detect

connection errors

Error collections

SQL Server returns error, the Data Provider

for SQL Server throws a SqlException that

you can catch in your application

When SqlException is thrown, inspect the

SqlException.Errors collection of errors

Error collections (page 233)

Exer:

Lab page 232

Lesson 5: Enumerating the Available SQL

Servers on a Network

Using Instance property of the

SqlDataSourceEnumerator class

call the GetDataSources method

The GetDataSources method returns a

Data-Table that contains information for each SQL

server that is visible on the network

Enumerating the Available SQL

(page 237)

Enumerating the Available SQL

Lab page 238

And … Questions?

And … Questions?

What about?

UDA

Connection

ConnectionPool

ConnectionString

What informations in Connection data object?