Question

Is it possible to join two ResultSets like join two tables in Java-oracle programming? I am writing a java program which querys two different oracle databases(the databases are physically in different locations). In the program, sql1 returns ResultSet ret1;sql2 returns ResultSet ret2. Suppose ret1 has the following data:

Id   item
------------
1   item1
2   item 2
3   item 3
.........

Ret2 has the following data

Id  info
---------
1  info1
2  info2
…

I need result like this

Id item info
----------------------
1   item1 info1
2   item2  info2

Can I do something like this in java:

Select ret1.id,ret1.item,ret2,info from ret1, ret2 where ret1.id=ret2.id

I know I can loop from ret1 and get the id then get info from ret2; I am wondering if there is a fast way like join two tables to join two ResultSets without looping? Actually these two results both have half million rows. Thank you!

Answer 1

dblink is not allowed to create due to permission issue. I finally find another solution. Here is what I am doing: I get resultset ret1 then using:

while (ret1.next()) { 
  get id from ret1, 
  query  info from another database;
  bla,bla,...
}
....

The performance is much better than getting two resultsets then looping one inside another…