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This part describes the way to implement procedure and cursor as well. I have together described cursor and procedure in a single example. What i have done is when you delete or update a record that record gets deleted from voter table and get inserted in to votertemp table. In procedure what i have tried to do is the deleted record that is currently in votertemp gets deleted from votertemp table and gets inserted back to voter table as it was in its first instance Oracle 1) type ed -> in the sql> command line -> it opens a notepad 2) type the procedure there! create or replace procedure voterundo is cursor votercur is select * from votertemp; id number(5); name varchar2(25); address varchar2(50); age varchar2(3); gender varchar2 (6); dob varchar2(30); begin open votercur; loop fetch votercur into id,name,address,age,gender,dob; exit when votercur%notfound; delete from voter; insert into voter values(id,name,address,age,gender,dob) ; delete from voterte...

Now we will see how to insert values into table a table and to view them. Oracle Initially we had created table in part1. Visual Basic 6.0 Now we wil insert data into the table through visual basic. The code for inserting will be as follows When you double click on add button it will open your code window it will have this code! Private Sub Command1_Click() Dim gen As String If (Option1.Value = True) Then gen = "male" ElseIf (Option2.Value = True) Then gen = "female" End If rsv.Open "insert into voter values(" & Text5.Text & ",'" & Text2.Text & "','" & Text3.Text & "','" & Combo1.Text & "','" & gen & "','" & DTPicker1.Value & "')", conv, adOpenDynamic, adLockOptimistic If (rsv.State = 1) Then rsv.Close End If MsgBox ("Data Entered") End Sub This will add the data entered into...

The first part defined how to establish connectivity between the back end and the front end of the project. Next we will see how to implement triggers . Oracle We need to Create the triggers in the oracle. 1) type ed in sql 2) it opens a notepad window 3) type the trigger as in the below example 4) exit the notepad with saving 5)and then type "/" 6) this will show a message as trigger created! 7) It should not show trigger created with compilation errors. If this message is shown check your syntax of trigger. Example: create or replace trigger votertrig after update or delete on voter for each row begin insert into votertemp values(:old.id,:old.name,:old.address,:old.age,:old.gender,:old.dob); end; Whenever we perform an update or delete operation the old values get stored into the votertemp table and the changed data gets reflected into the permanent table Visual Basic 6.0 In VB we do not have to do anything as triggers are automatically fired whenev...

Here is a basic VB application called voter information system demonstrated which explains the concepts quite clearly. The first step required to establish connectivity is preparing the back end and the front end of the project. These steps are divided into two parts first the back end that is the oracle and front end that is the Visual Basic 6.0. Oracle Firstly we need to set up the database. Create the tables, triggers and procedures and database in the oracle. Create tables: Example: create table voter(id number(5) primary key, name varchar2(25),address varchar2(50),age number(3),gender varchar2(6),dob varchar2(30)); create table votertemp(id number(5) primary key, name varchar2(25),address varchar2(50),age number(3),gender varchar2(6),dob varchar2(30)); (we will be using the next table in the triggers that we will be implementing) Visual Basic 6.0 Develop the VB application as in this example given below. Design the necessary forms for the application. The next part is ...