ASPNet_ADOdotNet1

8/2/2019 ASPNet_ADOdotNet1

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ADO.NET is the new database technology of

the .NET (Dot Net) platform, and it builds

on Microsoft ActiveX Data Objects (ADO).

ADO.NET is an integral part of the .NET

Compact Framework, providing access to

relational data, XML documents, and

application data.


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You can use ADO.NET to access data by using

the new .NET Framework data providers

which are:

Data Provider for SQL Server (System.Data.SqlClient).

Data Provider for OLEDB (System.Data.OleDb).

Data Provider for ODBC (System.Data.Odbc). Data Provider for Oracle (System.Data.OracleClient).


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There are two central components ofADO.NET classes:

1. DataSet

2. .NET Framework Data Provider.

Data Provider is a set of components including: the Connection object (SqlConnection, OleDbConnection, OdbcConnection, OracleConnection)

the Command object (SqlCommand, OleDbCommand, OdbcCommand, OracleCommand)

the DataReader object (SqlDataReader, OleDbDataReader, OdbcDataReader, OracleDataReader)

and the DataAdapter object (SqlDataAdapter, OleDbDataAdapter, OdbcDataAdapter,OracleDataAdapter).

DataSet object represents a disconnected cache of data which ismade up of DataTables and DataRelations that represent theresult of the command.


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Right click on Website name, select Add New

Item.

Select SqlServerDatabase Object

Give Proper name to Your database.

Done


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1. Add .NET Data Provider namespace.

using System.Data.SqlClient;

2. Making Connection String

public string ConString= "Integrated Security=SSPI;" + "InitialCatalog=Northwind;" + "Data Source=SONY\\MYSQLSERVER;" ;

3. Complete Code


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protected void Page_Load(object sender, EventArgs e)

{

SqlConnection con = null; string constr ="Integrated Security=SSPI;" + "Initial Catalog=Northwind;" + "Data

Source=CBP\\Employee;";

try

{

// setup the database connection

con = new SqlConnection(constr);

con.Open();

Response.Write("connection established successfully");

}

catch (Exception ex)

{

Response.Write("Error in connection : " + ex.Message);

//MessageBox.Show("Error in connection : " + ex.Message);

}

finally

{

// dispose of open objects

if (con != null)

con.Close();

} //finally

}


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The DataSet is similar to an array of

disconnected Recordset objects. It supports disconnected

data access and operations, allowing greater scalability

because you no longer have to be connected to the database

all the time. DataSet is a copy of an extracted data being

downloaded and cached in the client system.


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The DataSet object is made up of two objects:

DataTableCollection object containing null or

multiple DataTable objects (Columns, Rows, Constraints).

DataRelationCollection object containing null or

multiple DataRelation objects which establish a parent/child

relation between two DataTable objects.


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Create dataSet

DataSet dset = new DataSet();

A DataSet is a container; therefore, you have to fill it with data.


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string strSql = "select * from tbl_emp";

SqlDataAdapter dadapter = new SqlDataAdapter(); dadapter.SelectCommand = new SqlCommand(strSql, con);

//Fill Data Set

dadapter.Fill(dset);


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//Create a DataSet

DataSet dset = new DataSet();

//Create Data Table

DataTable dt = new DataTable();

//Fill Data Set

dadapter.Fill(dset);

//Fill DataTable via DataSet

dt = dset.Tables[0];

con.Close();

DropDownList1.DataSource = dt;

DropDownList1.DataTextField = dt.Columns[1].ToString();

DropDownList1.DataBind();


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DataAdapter object is like a bridge that links the database and a

Connection object with the ADO.NET-managedDataSet objectthrough its SELECT and action query Commands. It specifieswhat data to move into and out of theDataSet. Often, thistakes the form of references to SQL statements or storedprocedures that are invoked to read or write to a database.

The DataAdapter provides four properties that allow us tocontrol how updates are made to the server:

SelectCommand

UpdateCommand

InsertCommand DeleteCommand

The four properties are set to Command objects that are used

when data is manipulated.


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The DataAdapter includes three main methods:

Fill (populates a DataSet with data).

FillSchema (queries the database for schema information that

is necessary to update).

Update (to change the database, DataAdapter calls

the DeleteCommand, the InsertCommand and the

UpdateCommand properties).


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CONTINUE IN PART 2-

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