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Clone a record in the database or element in an arrayList

Reggie McDougal
Ranch Hand

Joined: Sep 27, 2004
Posts: 69
I have a result set saved into an ArrayList, how would I go about cloning
a record or element in the arrayList.

Then if I add an new record I have to insert in instead of updating in the database.

How might bI appraoch this problem.

Reg


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Jeanne Boyarsky
author & internet detective
Marshal

Joined: May 26, 2003
Posts: 30913
    
158

Reggie,
You have an ArrayList or what? Different resultsets? References to something?

If you had DTO (data transfer objects), it would make sense to clone the object. If they are really database objects, you have to make the copy yourslef and change the fields before adding it. An O/R framework would also be useful in abstracting the database code.


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Reggie McDougal
Ranch Hand

Joined: Sep 27, 2004
Posts: 69
Ok lets just say I want to clone a row in a table, how maight I do that?

Reg
Jeanne Boyarsky
author & internet detective
Marshal

Joined: May 26, 2003
Posts: 30913
    
158

Reg,
Using pure JDBC:
1) Read row from table into data structure
2) Create new row with that data (and different primary key)

As I said earlier, I think you would benefit from using an O/R framework. You are already thinking at a higher level of abstraction (thinking about cloning rather than copying rows) so it may be easier to work with objects.
Avi Abrami
Ranch Hand

Joined: Oct 11, 2000
Posts: 1135

Reggie,

I want to clone a row in a table

Do you mean that you want to insert the same row, a second time? In other words, you want the same row to appear twice in the same table? You are aware, I assume, that you won't be able to do this if there is a unique index (or primary key) defined for the particular table, aren't you?

Or do you want to copy a row from one table to another?

In either case, you can do this via SQL alone. Most databases support something like:

So no need for data structures in java. (Or am I missing something?)

Good Luck,
Avi.
 
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