WELL COME TO ALL

ADO.NET OVERVIEW

TAKEN BY,

M.STEPHEN,MCA.

Introduction to Microsoft ADO.NET

Part1: Overview

Overview of ADO.NET

Creating a Connection to a Database

Displaying a DataSet in a List-Bound Control

Lesson: Overview of ADO.NET

What is ADO.NET?

Using Namespaces

The ADO.NET Object Model

What is a DataSet?

Accessing Data with ADO.NET

Practice: Identifying ADO.NET Components

ADO.NET provides a set of classes for working with data. ADO.NET provides:

A system designed for disconnected environments

A programming model with advanced XML support

A set of classes, interfaces, structures, and enumerations that manage data access from within the .NET Framework

What is ADO.NET?

Using Namespaces

Use the Imports or using statement to import namespaces

Namespaces used with ADO.NET include:

System.Data

System.Data.SqlClient

System.Data.OleDb

Imports System.DataImports System.Data.SqlClientImports System.DataImports System.Data.SqlClient

using System.Data;using System.Data.SqlClient;using System.Data;using System.Data.SqlClient;

DataSet

SQL Server .NET Data Provider

OLE DB .NET Data Provider

SQL Server 7.0(and later)

OLEDB sources(SQL Server 6.5)

OleDbConnectionOleDbConnection

OleDbDataAdapterOleDbDataAdapterSqlDataAdapterSqlDataAdapter

SqlConnectionSqlConnection

DataTable

DataTable

The ADO.NET Object Model

SQL Server 2000

DataSet

DataTable

DataTable

Physical storage

OleDb Database

SqlDataAdapterSqlDataAdapter

SqlConnectionSqlConnection

DataTable

Web server memory

OleDbDataAdapterOleDbDataAdapter

OleDbConnection

OleDbConnection

What is a Dataset?

Accessing Data with ADO.NET

DatabaseDatabase

4. Return the DataSet to the Client

5. Client manipulates the data

2. Create the SqlConnection and SqlDataAdapter objects

3. Fill the DataSet from the DataAdapter and close the connection

SqlDataAdapter

SqlConnection

List-Bound

Control

List-Bound

Control

1. Client makes request1111

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6. Update the DataSet

7. Use the SqlDataAdapter to open the SqlConnection, update the database, and close the connection

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ClientClient

Web serverWeb server

DataSet

The DataAdapter Object Model

sp_SELECT

CommandCommand

SelectCommand UpdateCommand InsertCommand DeleteCommand

DataAdapter

CommandCommand CommandCommand CommandCommand

ConnectionConnection

sp_UPDATE sp_INSERT sp_DELETE

Database

DataSetDataSet

DataReaderDataReader

Generating a DataSet

You can generate a DataSet…

…through the UI…Creates a DataSet that allows you to access

data as an object

…or through code…

and then fill…

Dim ds As New DataSet()Dim ds As New DataSet()

DataAdapter1.Fill(ds)DataAdapter2.Fill(ds)DataAdapter1.Fill(ds)DataAdapter2.Fill(ds)

DataSet ds = new DataSet();DataSet ds = new DataSet();

DataAdapter1.Fill(ds);DataAdapter2.Fill(ds);DataAdapter1.Fill(ds);DataAdapter2.Fill(ds);

Displaying a DataSet in a List-Bound Control

What are List-Bound Controls?

Displaying DataSet Data in List-Bound Controls

Demonstration: Binding List-Bound Controls to a Database

Practice: Using a DataGrid

Demonstration: Customizing the DataGrid Control

What are List-Bound Controls?

Controls that connect to a data source and display the data

List-bound controls include the following:

DropDownList

ListBox

CheckBoxList

RadioButtonList

DataGrid

DataList

Repeater

Displaying DataSet Data in List-Bound Controls

Set the properties

Fill the DataSet, then call the DataBind methodDataAdapter1.Fill(ds)lstEmployees.DataBind()DataAdapter1.Fill(ds)lstEmployees.DataBind()

PropertyPropertyPropertyProperty DescriptionDescriptionDescriptionDescription

DataSourceDataSource The DataSet containing the data The DataSet containing the data

DataMemberDataMember The DataTable in the DataSet The DataTable in the DataSet

DataTextFieldDataTextField The field in the DataTable that is displayed The field in the DataTable that is displayed

DataValueFieldDataValueField The field in the DataTable that becomes the value of the selected item in the list

The field in the DataTable that becomes the value of the selected item in the list

DataAdapter1.Fill(ds);lstEmployees.DataBind();DataAdapter1.Fill(ds);lstEmployees.DataBind();

Overview

Introduction to Using ADO.NET

Connecting to a Database

Accessing Data with DataSets

Using Multiple Tables

Accessing Data with DataReaders

Lesson: Introduction to Using ADO.NET

Multimedia: The ADO.NET Object Model

Using DataSets vs. DataReaders

Practice: When to Use DataSets or DataReaders

Multimedia: The ADO.NET Object Model

Using DataSets vs. DataReaders

Slower access

Forward-only

Bind to one control only

Based on one SQL statement from one database

Read-only

Faster access

Forward and backward scanning of data

Bind to multiple controls

Includes multiple tables from different databases

Read/write access to data

DataReaderDataSet

Disconnected Connected

Lesson: Connecting to a Database

SQL Server Security

Creating the Connection

Demonstration: Setting SQL Server Security

SQL Server Security

ClientClient

Send the username and password in

clear text.

Do not send the username and

password. Just send that the user has been authenticated.

Mixed modeauthenticationMixed mode

authentication

Windows onlyauthenticationWindows onlyauthentication

SQL ServerOnly ASPNET account

is granted access

SQL ServerOnly ASPNET account

is granted accessWeb ServerWindows authentication

Web ServerWindows authentication

or…or…

SQL ServerEach user account added

to SQL Server logins group

SQL ServerEach user account added

to SQL Server logins group

Web ServerDefault ASP.NET settings

Web ServerDefault ASP.NET settings

Here is the username and

password

Creating the Connection

Using SqlConnection

Setting connection string parameters

Data Base

Server

User ID

Dim con as new connection()Con.connectionstring=“database=master;server=ORION;Uid=sample;pwd=sample;”Con.open()

Dim con as new connection()Con.connectionstring=“database=master;server=ORION;Uid=sample;pwd=sample;”Con.open()

Password

Provider

Lesson: Accessing Data with DataSets

Creating a DataAdapter

Creating a DataSet

Demonstration: Programmatically Using a DataSet

Using a DataView

Practice: Organizing Code to Create a DataSet

Binding a DataSet to a List-Bound Control

Instructor-Led Practice: Displaying a DataSet

Handling Errors

Store the query in a DataAdapter

The DataAdapter constructor sets the SelectCommand property

Set the InsertCommand, UpdateCommand, and DeleteCommand properties if needed

Creating a DataAdapter

Dim da As New SqlDataAdapter ("select * from Authors", conn)

Dim da As New SqlDataAdapter ("select * from Authors", conn)

da.SelectCommand.CommandText da.SelectCommand.Connection

da.SelectCommand.CommandText da.SelectCommand.Connection

SqlDataAdapter da = new SqlDataAdapter("select * from Authors",conn);

SqlDataAdapter da = new SqlDataAdapter("select * from Authors",conn);

da.SelectCommand.CommandText;da.SelectCommand.Connection;

da.SelectCommand.CommandText;da.SelectCommand.Connection;

Creating a DataSet

Create and populate a DataSet with DataTables

Fill method executes the SelectCommand

Access a DataTable

Dim ds As New DataSet()da.Fill(ds, "Authors")

Dim ds As New DataSet()da.Fill(ds, "Authors")

Dim r As DataRowDim str As StringFor Each r in _ ds.Tables("Authors").Rows str &= r(2) str &= r("au_lname")Next

Dim r As DataRowDim str As StringFor Each r in _ ds.Tables("Authors").Rows str &= r(2) str &= r("au_lname")Next

ds.Tables("Authors").Rows.Countds.Tables("Authors").Rows.Count

DataSet ds = new DataSet();da.Fill(ds, "Authors");

DataSet ds = new DataSet();da.Fill(ds, "Authors");

ds.Tables["Authors"].Rows.Count;ds.Tables["Authors"].Rows.Count;

string str="";

foreach(DataRow r in ds.Tables["Authors"].Rows){ str += r[2]; str += r["au_lname"];}

string str="";

foreach(DataRow r in ds.Tables["Authors"].Rows){ str += r[2]; str += r["au_lname"];}

Using a DataView

A DataView can be customized to present a subset of data from a DataTable

The DefaultView property returns the default DataView of the table

Setting up a different view of a DataSet

DataView dv = new DataView(ds.Tables["Authors"]);dv.RowFilter = "state = 'CA'";

DataView dv = new DataView(ds.Tables["Authors"]);dv.RowFilter = "state = 'CA'";

Dim dv As DataView = ds.Tables("Authors").DefaultView Dim dv As DataView = ds.Tables("Authors").DefaultView

Dim dv As New DataView (ds.Tables("Authors"))dv.RowFilter = "state = 'CA'"

Dim dv As New DataView (ds.Tables("Authors"))dv.RowFilter = "state = 'CA'"

DataView dv = ds.Tables["Authors"].DefaultView;DataView dv = ds.Tables["Authors"].DefaultView;

Binding a DataSet to a List-Bound Control

Create the control

Bind to a DataSet or a DataView

dg.DataSource = dsdg.DataMember = "Authors"dg.DataBind()

dg.DataSource = dsdg.DataMember = "Authors"dg.DataBind()

<asp:DataGrid id="dg" runat="server" /><asp:DataGrid id="dg" runat="server" />

dg.DataSource = ds;dg.DataMember = "Authors";dg.DataBind();

dg.DataSource = ds;dg.DataMember = "Authors";dg.DataBind();

Handling Errors

Connection will not open

Connection string is invalid

Server or database not found

Login failed

DataAdapter cannot create a DataSet

Invalid SQL syntax

Invalid table or field name

Code Example

Lesson: Using Multiple Tables

Storing Multiple Tables

Creating Relationships

Programmatically Navigating Between Tables Using Relationships

Visually Navigating Between Tables Using Relationships

Instructor-Led Practice: Displaying Data from Multiple Tables

Storing Multiple Tables

Add the first table

Add the subsequent table(s)

daCustomers = New SqlDataAdapter _ ("select * from Customers", conn1)daCustomers.Fill(ds, "Customers")

daCustomers = New SqlDataAdapter _ ("select * from Customers", conn1)daCustomers.Fill(ds, "Customers")

Orders

Customers

daOrders = New SqlDataAdapter _ ("select * from Orders", conn2)daOrders.Fill(ds, "Orders")

daOrders = New SqlDataAdapter _ ("select * from Orders", conn2)daOrders.Fill(ds, "Orders")

conn2conn1

DataSet

Creating Relationships

Identify parent column

Identify child column

Create DataRelation

Dim dr As New DataRelation _ ("name", parentCol, _ childCol)ds.DataRelations.Add(dr)

Dim dr As New DataRelation _ ("name", parentCol, _ childCol)ds.DataRelations.Add(dr)

Dim parentCol As DataColumn = _ ds.Tables("Customers").Columns("CustomerID")

Dim parentCol As DataColumn = _ ds.Tables("Customers").Columns("CustomerID")

Dim childCol As DataColumn = _ ds.Tables("Orders").Columns("CustomerID")

Dim childCol As DataColumn = _ ds.Tables("Orders").Columns("CustomerID")

Orders table

Customers table

DataSet

parentCol

childCol

DataRelation

Programmatically Navigating Between Tables Using Relationships

ds.Tables(index).Rows(index).GetChildRows("relation")ds.Tables(index).Rows(index).GetParentRow("relation")

ds.Tables(index).Rows(index).GetChildRows("relation")ds.Tables(index).Rows(index).GetParentRow("relation")

Customers Orders

GetChildRows

GetParentRowDataSet

ds.Tables[index].Rows[index].GetChildRows("relation");ds.Tables[index].Rows[index].GetParentRow("relation");

ds.Tables[index].Rows[index].GetChildRows("relation");ds.Tables[index].Rows[index].GetParentRow("relation");

Visually Navigating Between Tables Using Relationships

Dim tableView As DataViewDim currentRowView As DataRowView

tableView = New DataView(ds.Tables("Customers"))currentRowView = tableView(dgCustomers.SelectedIndex)dgChild.DataSource = currentRowView.CreateChildView("CustOrders")

Dim tableView As DataViewDim currentRowView As DataRowView

tableView = New DataView(ds.Tables("Customers"))currentRowView = tableView(dgCustomers.SelectedIndex)dgChild.DataSource = currentRowView.CreateChildView("CustOrders")

Customers Orders

CreateChildView

DataRowView

DataView

DataSet

DataView tableView;DataRowView currentRowView;

tableView = new DataView(ds.Tables["Customers"]);currentRowView = tableView[dgCustomers.SelectedIndex];dgChild.DataSource = currentRowView.CreateChildView("CustOrders");

DataView tableView;DataRowView currentRowView;

tableView = new DataView(ds.Tables["Customers"]);currentRowView = tableView[dgCustomers.SelectedIndex];dgChild.DataSource = currentRowView.CreateChildView("CustOrders");

Lesson: Accessing Data with DataReaders

What is a DataReader?

Creating a DataReader

Reading Data from a DataReader

Binding a DataReader to a List-Bound Control

Practice: Organizing Code to Create a DataReader

Demonstration: Displaying Data Using DataReaders

What is a DataReader?

Forward-only, read-only

Fast access to data

Connected to a data source

Manage the connection yourself

Manage the data yourself, or bind it to a list-bound control

Uses fewer server resources

Code Example

Creating a DataReader

To use a DataReader:

1. Create and open the database connection

2. Create a Command object

3. Create a DataReader from the Command object

4. Call the ExecuteReader method

5. Use the DataReader object

6. Close the DataReader object

7. Close the Connection object Use Try…Catch…Finally error handling

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Reading Data from a DataReader

Call Read for each record Returns false when there are no more records

Access fields Parameter is the ordinal position or name of the field Get functions give best performance

Close the DataReader

Close the connection

Do While myReader.Read() str &= myReader(1) str &= myReader("field") str &= myReader.GetDateTime(2)Loop

Do While myReader.Read() str &= myReader(1) str &= myReader("field") str &= myReader.GetDateTime(2)Loop

while (myReader.Read()){ str += myReader[1]; str += myReader["field"]; str += myReader.GetDateTime(2);}

while (myReader.Read()){ str += myReader[1]; str += myReader["field"]; str += myReader.GetDateTime(2);}

Binding a DataReader to a List-Bound Control

Create the Control

Bind to a DataReader

dgAuthors.DataSource = drdgAuthors.DataBind()

dgAuthors.DataSource = drdgAuthors.DataBind()

<asp:DataGrid id="dgAuthors" runat="server" /><asp:DataGrid id="dgAuthors" runat="server" />

dgAuthors.DataSource = dr;dgAuthors.DataBind();

dgAuthors.DataSource = dr;dgAuthors.DataBind();

Using Parameters

Identify the available parameters

Input

Output

InputOutput

ReturnValue

Include parameters in the parameters collection

or

Include parameter values in the command string

Passing Input Parameters

Create parameter, set direction and value, add to the Parameters collection

Run stored procedure and store returned records

SqlParameter param = new SqlParameter ("@Beginning_Date", SqlDbType.DateTime);param.Direction = ParameterDirection.Input;param.Value = Convert.ToDateTime

(txtStartDate.Text);da.SelectCommand.Parameters.Add(param);

SqlParameter param = new SqlParameter ("@Beginning_Date", SqlDbType.DateTime);param.Direction = ParameterDirection.Input;param.Value = Convert.ToDateTime

(txtStartDate.Text);da.SelectCommand.Parameters.Add(param);

ds = New DataSet();da.Fill(ds, "Products");

ds = New DataSet();da.Fill(ds, "Products");

Code Examples

ds = New DataSet()da.Fill(ds, "Products")

ds = New DataSet()da.Fill(ds, "Products")

param = New SqlParameter _ ("@Beginning_Date", SQLDbType.DateTime)param.Direction = ParameterDirection.Inputparam.Value = CDate(txtStartDate.Text)da.SelectCommand.Parameters.Add(param)

param = New SqlParameter _ ("@Beginning_Date", SQLDbType.DateTime)param.Direction = ParameterDirection.Inputparam.Value = CDate(txtStartDate.Text)da.SelectCommand.Parameters.Add(param)

Using Output Parameters

Create parameter, set direction, add to the Parameters collection

Run stored procedure and store returned records

Read output parameters

param = New SqlParameter("@ItemCount", SQLDbType.Int)param.Direction = ParameterDirection.Outputda.SelectCommand.Parameters.Add(param)

param = New SqlParameter("@ItemCount", SQLDbType.Int)param.Direction = ParameterDirection.Outputda.SelectCommand.Parameters.Add(param)

ds = new DataSet()da.Fill(ds)

ds = new DataSet()da.Fill(ds)

iTotal = da.Parameters("@ItemCount").Value iTotal = da.Parameters("@ItemCount").Value

param = new SqlParameter("@ItemCount", SqlDbType.Int);param.Direction = ParameterDirection.Output;da.SelectCommand.Parameters.Add(param);

param = new SqlParameter("@ItemCount", SqlDbType.Int);param.Direction = ParameterDirection.Output;da.SelectCommand.Parameters.Add(param);

ds = new DataSet();da.Fill(ds);

ds = new DataSet();da.Fill(ds);

iTotal = da.Parameters("@ItemCount").Value; iTotal = da.Parameters("@ItemCount").Value;

THANK YOU