Relation between java and oracle

Hi,
This is general information about java and oracle.
I had worked in java last one year, but now switch to oracle i heared that nearly combination of each are implemented oops concept. But i know where it used in java, not in oracle.
In oracle, where we are implemented inheritance, polymorhism and encapsulation.
plz give some tips
Regards venki

does this mean you used to develop your applications on java and manuplate your data in Oracle over JDBC or Hibernate but then you started to develop PL/SQL applications for this need and use PL/SQL's OO features?
With my experiences I may say if you are working on data intensive database applications learning how to use effectively SQL and PL/SQL is critical, this is Oracle's native language not something written to work for any database vendor. http://www.oracle.com/pls/db102/portal.portal_db?selected=5

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tanks for your attention
Edited by: Nasiri Mahdi on Feb 24, 2013 10:42 PM

Nasiri,
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884540 wrote:
hello frnds...i have installed oracle 10g in ubuntu 11.04....now i want to make database connection between java and oracle...so how can i do it??i know the java code..but the main problem is database driver..how can i give the classpath for specific jdbc dirver...pls tell me the steps to set classpath for jdbc driver...
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How to relate java and Oracle

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Here is a sample of a Java program that uses JDBC and a PreparedStatement. This particular program does a select, but you can also use this for inserts. I'm not 100% this is what you are looking for, but if it isn't just let me know. I'll help if I can.
Joel
For inserts, just replace this code:
ResultSet rs = ps.executeQuery();
while (rs.next()) {
System.out.println(rs.getInt(rs.findColumn("CNT")));
}with this code (and obviously change the Select string to an Insert String):
int rowcnt = ps.executeUpdate();Here is the whole program:
import java.sql.*;
import java.util.*;
import java.text.*;
class dbtest {
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Relation between Hyperion and ODI(Oracle Data Interagtor)

Hi Friends,
Now ODI became ad popular ELT Product. Companies looking ODI Developer having experience with Hyperion.
May i know what is Hyperion and what was the relation between Hyperion and ODI.
Regards,
Kishore
9676404087.

Hi John,
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What are the Relations between Journalizing and IKM?

What is the best method to use in the following scenario:
I have about 20 source tables with large amount of data.
I need to create interfaces that join the source tables into target tables.
The source tables are inserted every few secondes with about hundreds to thousands rows.
There can be a gap of few seconds between the insert of different tables that sould be joined.
The source and target tables are on the same Oracle instance and schema.
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In general What are the relations between 'Journalizing' and 'IKM'?
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I want to understand what is the role of 'Journalizing CDC'?
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What should i do if i can't put PK (there can be multiple identical rows)?
Thanks in advance Yael

Hi Yael,
I will try and answer as many of your points as I can in one post :-)
Journalizing is way of tracking only changed data in your source system, if your source tables had a date_modified you could always use this as a filter when scanning for changes rather than CDC, Log based CDC (Asynchronous in ODI, Logminer/Streams or Goldengate for example) removes the overhead of of placing a trigger on the source table to track changes but be aware that it doesnt fully remove the need to scan the source tables, in answer to you question about Primary keys, Oracle CDC with ODI will create an unconditional log group on the columns that you have defined in ODI as your PK, the PK columns are tracked by the database and presented in a Journal table (J$<source_table_name>) this Journal table is joined back to source table via a journalizing view (JV$<source_table_name>) to get the rest of the row (ie none PK columns) - So be aware that when ODI comes around to get all data in the Journalizing view (ie Inserts, Updates and Deletes) the source database performs a join back to the source table. You can negate this by specifying ALL source table columns in your PK in ODI - This forces all columns into the unconditional log group, the journal table etc. - You will need to tweak the JKM to then change the syntax sent to the database when starting the journal - I have done this in the past, using a flexfield in the datastore to toggle 'Full Column' / 'Primary Key Cols' to go into the JKM set up (there are a few Ebusiness suite tables with no primary key so we had to do this) - The only problem with this approach is that with no PK , you need to make sure you only get the 'last' update and in the right order to apply to your target tables, without so , you might process the update before the insert for example, and be out of sync.
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user604062 wrote:
I want to understand the role of: 'Journalizing CDC' and 'IKM - Incremental Update' and
how can i use it in my scenario?Hopefully I have explained it above, its the type of thing you really need to play around with, and throroughly review the operator logs to see what is actually going on (I think this is a very good guide to setting it up : http://soainfrastructure.blogspot.ie/2009/02/setting-up-oracle-data-integrator-odi.html)
In general What are the relations between 'Journalizing' and 'IKM'?JKM simply presents (only) changed data to ODI, it removes the need for you to decide 'how' to get the updates and removes the need for costly scans on the source table (full source to target table comparisons, scanning for updates based on last update date etc)
Should i use both of them? Or maybe it is better to deelte and insert to the target tables?Delete and insert into target is fine , but ask yourself how do you identify which rows to process, inserts and updates are generally OK , to spot a delete you need to compare the table in full, target table minus source table = deleted rows , do you want to copy the whole source table every time to perform this ? Are they in the same database ?
I want to understand what is the role of 'Journalizing CDC'?Its the ODI mechanism for configuring, starting, stopping the change data capture process in the source systems , there are different KM's for seperate technologies and a few to choose for Oracle (Triggers (Synchronous), Streams / Logminer (Asynchronous), Goldengate etc)
Can 'IKM - Incremental Update' work without 'Journalizing'?Yes of course, Without CDC your process would look something like :
Source target ----< LKM >---- Collection table (C$) ----<IKM>---- Integration table (I$) -----< IKM >---- Target table
With CDC your process looks like :
Source Journal (J$ table with JV$ view) ----< LKM >---- Collection table (C$) ----<IKM>---- Integration table (I$) -----< IKM >---- Target table
as you can see its the same process after the source table (there is an option in the interface to enable the J$ source , the IKM step changes with CDC as you can use 'Synchronise Journal Deletes'
Does 'Journalizing' need to have PK on the tables?Yes - at least a logical PK in the datastore, see my reply at the top for reasons why (Log Groups, joining back the J$ table to the source table etc)
What should i do if i can't put PK (there can be multiple identical rows)? Either talk to the source system people about adding one, or be prepared to change the JKM (and maybe LKM, IKM's) , you can try putting all columns in the PK in ODI. Ask yourself this , if you have 10 identical rows in your source and target tables, and one row gets updated - how can you identify which row in the target table to update ?
>
Thanks in advance YaelA lot to take in, as I advised I would reccomend you get a little test area set up and also read the Oracle database documentation on CDC as it covers a lot of the theory that ODI is simply implementing.
Hope this helps!
Alastair

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hello,
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hi,
chekc this. its working for me.
data : WA_AWKEY LIKE BKPF-AWKEY.
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data : LENGTH TYPE I.
*BREAK MTABAP.
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it_final-acc_doc = WA_BELNR .
CLEAR WA_BELNR .
CLEAR WA_AWKEY.
endif.

Relation between java and oracle

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