The document discusses database connectivity in Visual Basic 6 using ADO (Active Data Objects). It describes the Connection object that represents a connection to a data source, the Command object that specifies database operations, and the Recordset object that represents a set of records. It explains how to define these objects, connect to a database, execute commands to retrieve data, and manipulate the retrieved data in a Recordset.

1. Database Connectivity
using ADODB

2. Visual Basic 6 ADO
 Visual Basic 6 obsoletes the previously used
database access technology provided by Jet
 This provides a new one known as ADO or Active
Data Objects
 This technology allows users to access data
easily from many existing databases like Oracle
or MS SQL Server
 ADO is quite simple and allows programmers to
provide flexible database front ends

3. Connection Object
 This object represents an open connection to the
data source
 This connection can be a local connection or can
be across a network
 Key Properties and Methods
Property Methods
ConnectionString Close
Provider Open
ConnectionTimeout
CommandTimeout
CursorLocation
Mode

4. Command Object
 A command object specifies a specific method
you intend to execute on or against the data
source accessed by an open connection
 Key Properties and Methods
Property Methods
Key Properties and Execute
Methods
CommandText
CommandType

5. Recordset Object
 The RecordSet object represents a complete set
of records from an underlying base table in the
database
 RecordSet object references only one record at a
time as the current record
 Key Properties and Methods Methods
Property
CursorLocation AddNew
CursorType Close and Open
EOF and BOF MoveNext
Fields MoveFirst
RecordCount MoveLast
MovePrevious

6. Putting These altogether
 Define and open a Connection to a data source
 Decide what data you need from the data source
and define Command objects that will retrieve this
data.
 Retrieve the data you require by executing the
command objects and manipulate the data using
RecordSet objects.

7. Database Connectivity
Steps
 Make a VB application that can be used to
connect to database

8.  Go to components

9.  Choose Microsoft ADO Data Control 6.0(OLEDB)

10.  Component is added

11.  Click on Adodc and go to its properties

12.  Click on Build

13.  Select Microsoft Jet 4.0 OLE DB Provider and
next

14.  Select database and test the connection

15.  From here copy connection string and click ok

16. Establish Connection
Dim con As New ADODB.Connection
Dim rs As New ADODB.Recordset
Dim cmd As New ADODB.Command
Private Sub Form_Load()
con.ConnectionString
="Provider=Microsoft.Jet.OLEDB.4.0;Data
Source=C:Documents and
SettingsAdministratorDesktopEmployee.mdb"
con.Open
rs.Open "select * from employee", con,
adOpenDynamic, adLockOptimistic
cmd.ActiveConnection = con

17. Conti..
txt_id = rs.Fields(0)
txt_name = rs.Fields(1)
txt_desig = rs.Fields(2)
txt_add = rs.Fields(3)
txt_sal = rs.Fields(4)
txt_doj = rs.Fields(5)
txt_phn = rs.Fields(6)
txt_email = rs.Fields(7)

18. How to use Flex Grid in
VB
 Go to components

19.  Choose Microsoft FlexGrid Control 6.0 from
components

20.  Select flexgrid from toolbox and drop it in form

21.  Select Data tool from tool box and drop it in form

22.  Select DataSource property of FlexGrid

23.  Choose DatabaseName from Data tool properties

24.  Choose your database which you want to use

25.  Choose Recordset property of Data tool

26.  Your selected recordset will be shown in flexgrid

27. How to use data grid in
VB
 Go to components

28.  Select Microsoft DataGrid Control 6.0(OLEDB)

29.  Select data grid from tool box and drop in form

30.  Go to Adodc properties

31.  Select Microsoft Jet 4.0 ILE Db Provider

32.  Select database name

33.  Test the connection

34.  Go to RecordSource select CommandType as 2-
adCmdTable and Table

35.  Select DataSource from data grid properties

36.  Your data grid is working

37. References
 http://www.w3schools.com
 http://www.codeproject.com
 http://msdn.microsoft.com