How To Fill Data Into Dataset In VB.NET

This article describes how to use fill method to fill the data into dataset.
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This article describes how to fill the data into DataSet. To do that we use DataAdapter to retrieve the data from the database and place the data into DataSet. To fill the data into the DataSet use Fill method.

Creating connection object

To create a connection we pass the connection string as a parameter in connection object.

Dim str As String = "Data Source=.;uid=sa;pwd=123;database=master"

Dim con As New SqlConnection(str)

 

The above string defines the connection string which is used to connect the database with the application.

 

DataAdapter

 

The DataAdapter is used to retrieve the data from the database and place that data in DataSet.

 

 Dim str1 As String = "SELECT * FROM logn"

 Dim cmd As New SqlCommand(str1, con)

  Dim da As New SqlDataAdapter(cmd)

   Dim ds As New DataSet()

    da.Fill(ds, "logn")

 

DataColumn

 

The Datacolumn represents a schema of the column in data table and ColumnName property is used to find the name of the column.

 

Dim dc As DataColumn

  For Each dc In ds.Tables(0).Columns

    Console.Write("{0,12}", dc.ColumnName)

Next

Console.WriteLine("")
 

DataRow

DataRow represents a row of data in a data table.

 

Dim dr As DataRow

   For Each dr In ds.Tables(0).Rows

     Dim i As Integer

       For i = 1 To ds.Tables(0).Columns.Count

          Console.Write("{0,12}", dr(i - 1))

Next i

Console.WriteLine("")

 

Now we create a database table and insert some values in this table. Table looks like this.

 

create table logn

(

username varchar(50),

password varchar(40)

)

go

insert into logn values('monu','mohan')

go

insert into logn values('Rohatash','rohit')

go

insert into logn values('Manoj','singh')

go

select * from logn;

The table looks like this.

 

OUTPUT
 

output-in-vb.net.gif

For example

Imports System.Data.SqlClient

Module Module1

    Sub Main()

        Dim str As String = "Data Source=.;uid=sa;pwd=123;database=master"

        Dim con As New SqlConnection(str)

        Dim str1 As String = "SELECT * FROM logn"

        Dim cmd As New SqlCommand(str1, con)

        Dim da As New SqlDataAdapter(cmd)

        Dim ds As New DataSet()

        da.Fill(ds, "logn")

        Dim dc As DataColumn

        For Each dc In ds.Tables(0).Columns

            Console.Write("{0,12}", dc.ColumnName)

        Next

        Console.WriteLine("")

        Dim dr As DataRow

        For Each dr In ds.Tables(0).Rows

            Dim i As Integer

            For i = 1 To ds.Tables(0).Columns.Count

                Console.Write("{0,12}", dr(i - 1))

            Next i

            Console.WriteLine("")

        Next

    End Sub

End Module

 

OUTPUT

 

vb.net-command-prompt.gif

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