Which is more efficient way to get result set from database server

Hi,
I am working on a project where I require to query database to fetch result set and then iterate through the resultset. Now, What I want is that I want to create one single java code that would call many different SQLs and create a list out of resultset. There are two approaches for me.
1.) To create a txt file where I can store my queries. My java program can read this file and get the appropriate query to be used.
2.) To create a stored procedure containing the queries and call the stored procedure from my java program. Also, not that some of the queries needs to be created dynamically depending upon the parameteters supplied.
Out of these two approches which is optimum and why?
Also, following things to be noted.
1. At times I want to create where clause of the query dynamically depenending upon the parameters passed.
2. I want one single java file that will handle all database calls.
3. Paramters to the stored procedure can be passed using array descriptor.
4. Conneciton I am making using JNDI.
Please do provide me optimum way of out these two. You may also suggest some other approaches, if any.
Thanks,
Rajan
Edited by: RP on Jun 26, 2012 11:11 PM

RP wrote:
In case of queries stored in text files. I will require to replace some pre defined placeholder with actual parameters and then pass that modified query to db engine. Even I liked the second approach as it is more easily maintainable. There are a couple of issues. Shared SQL is one. Irrespective of the method used, the SQL cursor that is created needs to have bind variables. This ensures re-usability of the cursor. This reduces the risk of Shared Pool fragmentation. This lowers hard parsing and reduces CPU utilisation.
Another issue is flexibility. If the SQL cursors are created by stored procedures, this code resides on the server and abstracts the Java client from the complexities of SQL and SQL performance. The code can easily be updated and fine tuned to deliver faster/better SQL cursors, or modified to take new Oracle features, changes in data model, and so on, into consideration. This stored proc can be updated without having to touch or recompile a single byte of Java client code.
There's also the security issue. What is more secure? SQL encapsulated in stored procs in a secure database and server environment? Or SQL "encapsulated" in text files on the client?
The less code you have running on the client, the less code you have running in the wild that can be compromised without having to first compromise the server.
Only I was worried about any performace issue might happen using this approach. Performance is not a factor of who creates the SQL cursor.
Whether Java client creates a SQL cursor, or a PL/SQL stored proc creates a SQL cursor, or a .Net client creates a SQL cursor - that SQL cursor does not know what the client is. It does not care what the client is. The SQL cursor performs as well as it is capable of.. given the execution plan, data volumes, server resources and speed/performance of the server.
The client language and SQL cursor interface used by the client (there are several in PL/SQL), determines the performance of the client's interaction with the cursor (e.g. round trips to the database when interfacing with the cursor). The client language (and its client interface to the cursor) does not dictate the actual performance of that SQL cursor on the database (does not make joins faster, or I/O faster)
One more question, Will my java program close the cursor that I opened in Procedure?That you need to ask your Java code. Java code leaking ref cursors are unfortunately all too common. You need to make sure that your Java client interface to SQL cursors, closes the cursor handle when done.

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*SELECT (%EMPLOYEE%, ID, EMPLOYEE, [COSTCENTER] = %COSTCENTER_SET%)
//Workmens Comp
*XDIM_MEMBERSET P_ACCT = "IKR0000642000"
*FOR %EMP% = %EMPLOYEE%
         [EMPLOYEE].[#%EMP%] = ( [P_ACCT].[P00205],[EMPLOYEE].[DUMMY ]) * ( [P_ACCT].[P00400],[EMPLOYEE].[%EMP%] )
*NEXT
*COMMIT
//Fringe Benefits Employer
*XDIM_MEMBERSET P_ACCT = "IKR0000628100"
*FOR %EMP% = %EMPLOYEE%
         [EMPLOYEE].[#%EMP%] = ( [P_ACCT].[P00210],[EMPLOYEE].[DUMMY ]) * ( [P_ACCT].[P00400],[EMPLOYEE].[%EMP%] )
*NEXT
*COMMIT
//Fringe Benefits Other
*XDIM_MEMBERSET P_ACCT = "IKR0000626100"
*FOR %EMP% = %EMPLOYEE%
         [EMPLOYEE].[#%EMP%] = ( [P_ACCT].[P00209],[EMPLOYEE].[DUMMY ]) * ( [P_ACCT].[P00400],[EMPLOYEE].[%EMP%] )
*NEXT
*COMMIT

Maybe the following?
*SELECT (%EMPLOYEE%, ID, EMPLOYEE, [COSTCENTER] = %COSTCENTER_SET%)
*XDIM_MEMBERSET EMPLOYEE = %EMPLOYEE%
*XDIM_MEMBERSET P_ACCT = IKR0000642000,IKR0000628100,IKR0000626100
//Workmens Comp
[P_ACCT].[#IKR0000642000] = ( [P_ACCT].[P00205],[EMPLOYEE].[DUMMY] ) * ( [P_ACCT].[P00400] )
//Fringe Benefits Employer
[P_ACCT].[#IKR0000628100] = ( [P_ACCT].[P00210],[EMPLOYEE].[DUMMY] ) * ( [P_ACCT].[P00400] )
//Fringe Benefits Other
[P_ACCT].[#IKR0000626100] = ( [P_ACCT].[P00209],[EMPLOYEE].[DUMMY] ) * ( [P_ACCT].[P00400] )
*COMMIT
You should probably also restrict explicitly on all other dimensions in your applications so that none are accidentally left open that don't need to be.
Ethan

Which is more efficient way to get result set from database server

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