Dynamic insertion of data in a Dynamic Column in a table

Question

Hi EveryBody ,
I have a table where i am increasing the column dynamically . I need to insert data through PreparedStatement Like
pst = con.prepareStatement(CBBsqlConstants.addOrderItem);
               pst.setString(1,ein);
               pst.setString(2,insert_date);
               pst.setString(3,checkList);
               pst.setString(4,Quantities);
               pst.setDate(5,pick_date);
               pst.setDate(6,completed_date);
               pst.setString(7,comment);
               pst.setInt(8,status);
               pst.setString(9,agent_ein);
               i = pst.executeUpdate();
But here my column is increasing dynamically, so the above cant be constant as column is incresing . how do i handle the insertion part dynamically.
Thanks So much . Please help with this .

Answer 1

Server_java wrote:
Ya you are right ,
Take i am ordering some Items and quantity from checkbox and inserting that to the table , each item and quantity is going to consume a row , but when i am going have column for each item , all the items i am going to select is going to appear in a single row . so i am consuming .But only 256 column is allowed for a table ,but my item is not going to excced that . That maximum number of columns is the least of the problems here.
The problem is that you are taking data that should be in another table and turning it into metadata instead. That's a mistake because it makes your entire application brittle and it doesn't need to be. It also will make querying your table a nightmare.
Let's take a look at your solution and then the correct solution.
Your solution (condensed)
tblOrder
id
customername
apples
oranges
bananas
cherries
Sample data (CSV format for the forum)
1,"John Smith",0,0,0,1
2,"Jane Smith",1,0,0,3
3,"Kate Smith",0,2,1,0
The correct solution
tblOrder
id
customername
Sample data
1,"John Smith"
2,"Jane Smith"
3,"Kate Smith"
tblProduct
id
name
Sample data
1, "Apples"
2,"Oranges"
3, "Bananas"
4, "Cherries"
tblOrderItem
orderid
productid
quantity
Sample data
1,4,1
2,1,1
2,4,3
3,2,2
3,3,1
So what's the difference?
With your design what happens when you want to add a new fruit? Your schema changes and all your code breaks. With my design you simply insert one row and that's it.
And what happens if you do happen to eventually need more than 250 odd fruits? With your design you are screwed. With my correct design it's never going to be a problem.
And consider that with my design you can populate user inteface components using actual data and not table meta data.
And the list goes on... the point is the only correct solution is to use a proper relational design.