How to pass a result set as an output parameter

I have a function that will be used as a web service. It invokes a stored procedure - ideally I'd like to pass the result set from the SP out as a result set to the client consuming the web service. Is this do-able or am I in dreamland?

What you typically do is iterate thru the RS, turning each row of data into a business object and adding all the business objects to a list or some other collection. Then close the result set. Return that collection of business objects to the client.

Similar Messages

How to pass a data set as a filter?

Hello everybody!
Are asking me to do the following:
Select from a Combo Box classifications suppliers and all suppliers to pass on the whole as a result of a query filter.
At this time I was only able to pass the values of the first, someone will have some idea on how to pass a data set as a filter?
The result of my selection, as a way to "Store" and assign it as my input filter query.
thanks for your help.

Hi Jan,
thanks for your help, but...
My problem is passing the result of a query directly to another query, to me that this generates a result.
For Example: zquery_1, is the entry qualification of suppliers and I returned a set of suppliers.
The zquery 2, receives as input suppliers that set me back and the materials associated with the suppliers.
To achieve this, I am passing the result of a zquery_1 store and east asginandolo as variable input to zquery_2, my problem is that this just me reading the first of the records.
If the 3 providers zquery_1 me back, how can I pass these 3 andalusia zquery_2 providers without the user having to select them?
greetings
Manuel Sandoval

Minus and passing the result set

I have a query in a procedure....let us say "test.prc":
select A.VALUE from TABLE A
where A.VALUE_ID = get_rec.VALUE_ID minus
select B.VALUE from TABLE B
In the above query, I am passing the "get_rec.VALUE_ID" from a cursor above the query.
Now is there a way to capture the result set of the above minus operation and pass the result set to the calling sql program (called "call_test.sql")?
Thanks,
Chiru
Message was edited by:
Megastar_Chiru

I got what I was trying to do...
I have 1 more question though....I am printing out my output using dbms package from sql*plus...using the following command
dbms_output.put_line(nvl('Flex Value set Id : '||get_rec.flex_value_set_id,0)||' values that have no corresponding alias : ' || nvl(v_flex_val,0));
"get_rec.flex_value_set_id" gets passed in from my cursor above the dbms statement.
and it looks like below:
Flex Value set Id : 20118 values that have no corresponding alias : 00
Flex Value set Id : 20118 values that have no corresponding alias : 10
Flex Value set Id : 20118 values that have no corresponding alias : 11
Flex Value set Id : 20118 values that have no corresponding alias : 20
Flex Value set Id : 20118 values that have no corresponding alias : 30
Flex Value set Id : 20124 values that have no corresponding alias : Standard
Is there some way to neatly break when the value set id changes? ...ie., make it print output something like below:
Flex Value set Id : 20118
values that have no corresponding alias : 00
values that have no corresponding alias : 10
values that have no corresponding alias : 11
values that have no corresponding alias : 20
values that have no corresponding alias : 30
Flex Value set Id : 20124
values that have no corresponding alias : Standard
Thanks,
Chiru

How can we generate result set report?

how can we generate result set report ?means the out put of one query be the input of another query?how it is?

Hi
You have to use APD ( analysis process designer) to use results of one query as the input for the other queries.
Check this link
http://help.sap.com/saphelp_nw70/helpdata/en/49/7e960481916448b20134d471d36a6b/frameset.htm
Regards

How to handle large result set of a SQL query

Hi,
I have a question about how to handle large result set of a SQL query.
My query returns more than a million records. However, the Query Template has a "row count" parameter. If I don't specify it, it by default returns only 100 lines of records in the query result. If I specify it, then it's limited to a specific number.
Is there any way to get around of this row count issue? I don't want any restriction on the number of records returned by a query.
Thanks a lot!

No human can manage that much data...in a grid, a chart, or a direct-connected link to the brain.
What you want to implement (much like other customers with similar requirements) is a drill-in and filtering model that helps the user identify and zoom in on data of relevance, not forcing them to scroll through thousands or millions of records.
You can also use a time-based paging model so that you only deal with a time "slice" at one request (e.g. an hour, day, etc...) and provide a scrolling window. This is commonly how large datasets are also dealt with in applications.
I would suggest describing your application in more detail, and we can offer design recommendations and ideas.
- Rick

Returning result set from procedure out parameter, display with anon block

I'm trying to do something pretty simple (I think it should be simple at least). I want to use a pl/sql procedure to return a result set in an OUT parameter. If I run this code by itself (in the given anonymous block at the end, without trying to display any results), toad says that the PL/SQL procedure successfully completed.
How can I display the results from this procedure? I am assuming that the result set should be stored in the O_RETURN_REDEEM_DTL, but how can I get anything out of it?
I have this package with the following procedure:
/* FUNCTION - REDEEM_DTL_READ                          */
     PROCEDURE REDEEM_DTL_READ(
          ZL_DIVN_NBR_IN     IN     REDEEM_DTL.ZL_DIVN_NBR%TYPE,
          GREG_DATE_IN     IN     REDEEM_DTL.GREG_DATE%TYPE,
          ZL_STORE_NBR_IN     IN     REDEEM_DTL.ZL_STORE_NBR%TYPE,
          REGISTER_NBR_IN     IN     REDEEM_DTL.REGISTER_NBR%TYPE,
          TRANS_NBR_IN     IN     REDEEM_DTL.TRANS_NBR%TYPE,
          O_RETURN_REDEEM_DTL OUT REDEEM_DTL_TYPE,
          o_rtrn_cd       OUT NUMBER,
          o_err_cd        OUT NUMBER,
          o_err_msg       OUT VARCHAR2
     IS
     BEGIN
          o_rtrn_cd := 0;
          o_err_msg := ' ';
          o_err_cd := 0;
          --OPEN REDEEM_DTL_READ_CUR(ZL_DIVN_NBR_IN, GREG_DATE_IN, ZL_STORE_NBR_IN, REGISTER_NBR_IN, TRANS_NBR_IN);
          OPEN O_RETURN_REDEEM_DTL FOR SELECT * FROM REDEEM_DTL;
--           LOOP
--                FETCH REDEEM_DTL_READ_CUR INTO O_RETURN_REDEEM_DTL;
--                EXIT WHEN REDEEM_DTL_READ_CUR%NOTFOUND;
--           END LOOP;
--           CLOSE REDEEM_DTL_READ_CUR;
     EXCEPTION
      WHEN OTHERS
      THEN
           o_rtrn_cd := 7;
             o_err_msg := SUBSTR (SQLERRM, 1, 100);
             o_err_cd := SQLCODE;
     END REDEEM_DTL_READ;and call it in an anonymous block with:
DECLARE
ZL_DIVN_NBR_IN NUMBER;
GREG_DATE_IN DATE;
ZL_STORE_NBR_IN NUMBER;
REGISTER_NBR_IN NUMBER;
TRANS_NBR_IN NUMBER;
O_RETURN_REDEEM_DTL PSAPP.CY_SALESPOSTING.REDEEM_DTL_TYPE;
O_RETURN_REDEEM_DTL_OUT PSAPP.CY_SALESPOSTING.REDEEM_DTL_READ_CUR%rowtype;
O_RTRN_CD NUMBER;
O_ERR_CD NUMBER;
O_ERR_MSG VARCHAR2(200);
BEGIN
ZL_DIVN_NBR_IN := 71;
GREG_DATE_IN := TO_DATE('07/21/2008', 'MM/DD/YYYY');
ZL_STORE_NBR_IN := 39;
REGISTER_NBR_IN := 1;
TRANS_NBR_IN := 129;
-- O_RETURN_REDEEM_DTL := NULL; Modify the code to initialize this parameter
O_RTRN_CD := NULL;
O_ERR_CD := NULL;
O_ERR_MSG := NULL;
PSAPP.CY_SALESPOSTING.REDEEM_DTL_READ ( ZL_DIVN_NBR_IN, GREG_DATE_IN, ZL_STORE_NBR_IN,
REGISTER_NBR_IN, TRANS_NBR_IN, O_RETURN_REDEEM_DTL, O_RTRN_CD, O_ERR_CD, O_ERR_MSG );
FOR item IN O_RETURN_REDEEM_DTL
LOOP
    DBMS_OUTPUT.PUT_LINE('ZL_DIVN_NBR = ' || item.ZL_DIVN_NBR);
END LOOP;
END; And end up with an error:
ORA-06550: line 25, column 15:
PLS-00221: 'O_RETURN_REDEEM_DTL' is not a procedure or is undefined
ORA-06550: line 25, column 3:
PL/SQL: Statement ignoredMessage was edited by:
user607908

Aha, I knew I forgot something!
I actually had it defined as a REF CURSOR in PSAPP.CY_SALESPOSTING package spec:
TYPE REDEEM_DTL_TYPE IS REF CURSOR;since I wasn't sure what to make it.
Cursor used in procedure:
CURSOR REDEEM_DTL_READ_CUR (
zl_divn_nbr_in IN NUMBER,
greg_date_in IN DATE,
zl_store_nbr_in IN NUMBER,
register_nbr_in IN NUMBER,
trans_nbr_in IN NUMBER)
IS
SELECT ZL_DIVN_NBR, GREG_DATE, ZL_STORE_NBR, REGISTER_NBR, TRANS_NBR, PAYMENT_TYP_NBR
FROM REDEEM_DTL
WHERE ZL_DIVN_NBR = zl_divn_nbr_in AND GREG_DATE = greg_date_in AND
   ZL_STORE_NBR = zl_store_nbr_in AND REGISTER_NBR = register_nbr_in AND
   TRANS_NBR = trans_nbr_in;Updated code:
/* PROCEDURE - REDEEM_DTL_READ                          */
     PROCEDURE REDEEM_DTL_READ(
          ZL_DIVN_NBR_IN     IN     REDEEM_DTL.ZL_DIVN_NBR%TYPE,
          GREG_DATE_IN     IN     REDEEM_DTL.GREG_DATE%TYPE,
          ZL_STORE_NBR_IN     IN     REDEEM_DTL.ZL_STORE_NBR%TYPE,
          REGISTER_NBR_IN     IN     REDEEM_DTL.REGISTER_NBR%TYPE,
          TRANS_NBR_IN     IN     REDEEM_DTL.TRANS_NBR%TYPE,
          O_RETURN_REDEEM_DTL OUT REDEEM_DTL_TYPE,
          o_rtrn_cd       OUT NUMBER,
          o_err_cd        OUT NUMBER,
          o_err_msg       OUT VARCHAR2
     IS
     BEGIN
          o_rtrn_cd := 0;
          o_err_msg := ' ';
          o_err_cd := 0;
          OPEN REDEEM_DTL_READ_CUR(ZL_DIVN_NBR_IN, GREG_DATE_IN, ZL_STORE_NBR_IN,
               REGISTER_NBR_IN, TRANS_NBR_IN);
          --OPEN O_RETURN_REDEEM_DTL FOR SELECT * FROM REDEEM_DTL;
          LOOP
              FETCH REDEEM_DTL_READ_CUR INTO O_RETURN_REDEEM_DTL;
               EXIT WHEN REDEEM_DTL_READ_CUR%NOTFOUND;
               DBMS_OUTPUT.PUT_LINE('ZL_DIVN_NBR = ' || O_RETURN_REDEEM_DTL.ZL_DIVN_NBR);
          END LOOP;
         CLOSE REDEEM_DTL_READ_CUR;
--           LOOP
--                FETCH REDEEM_DTL_READ_CUR INTO O_RETURN_REDEEM_DTL;
--                EXIT WHEN REDEEM_DTL_READ_CUR%NOTFOUND;
--           END LOOP;
--           CLOSE REDEEM_DTL_READ_CUR;
     EXCEPTION
      WHEN OTHERS
      THEN
           o_rtrn_cd := 7;
             o_err_msg := SUBSTR (SQLERRM, 1, 100);
             o_err_cd := SQLCODE;
     END REDEEM_DTL_READ;the updated anon block:
DECLARE
ZL_DIVN_NBR_IN NUMBER;
GREG_DATE_IN DATE;
ZL_STORE_NBR_IN NUMBER;
REGISTER_NBR_IN NUMBER;
TRANS_NBR_IN NUMBER;
O_RETURN_REDEEM_DTL PSAPP.CY_SALESPOSTING.REDEEM_DTL_TYPE;
O_RTRN_CD NUMBER;
O_ERR_CD NUMBER;
O_ERR_MSG VARCHAR2(200);
BEGIN
ZL_DIVN_NBR_IN := 71;
GREG_DATE_IN := TO_DATE('07/21/2008', 'MM/DD/YYYY');
ZL_STORE_NBR_IN := 39;
REGISTER_NBR_IN := 1;
TRANS_NBR_IN := 129;
-- O_RETURN_REDEEM_DTL := NULL; Modify the code to initialize this parameter
O_RTRN_CD := NULL;
O_ERR_CD := NULL;
O_ERR_MSG := NULL;
PSAPP.CY_SALESPOSTING.REDEEM_DTL_READ ( ZL_DIVN_NBR_IN, GREG_DATE_IN, ZL_STORE_NBR_IN,
     REGISTER_NBR_IN, TRANS_NBR_IN, O_RETURN_REDEEM_DTL, O_RTRN_CD, O_ERR_CD, O_ERR_MSG );
FOR item IN 1..O_RETURN_REDEEM_DTL.COUNT
LOOP
    DBMS_OUTPUT.PUT_LINE('ZL_DIVN_NBR = ' || O_RETURN_REDEEM_DTL(item).ZL_DIVN_NBR);
END LOOP;
END;and the new error:
ORA-06550: line 25, column 38:
PLS-00487: Invalid reference to variable 'O_RETURN_REDEEM_DTL'
ORA-06550: line 25, column 3:
PL/SQL: Statement ignoredAlso, it would be nice if the forums would put a box around code so that it would be easy to
distinguish between what is supposed to be code and what should be regular text...
Message was edited by:
user607908

How to pass query result to HTML table?

Hi,
i want to get the query result in HTMl table instead of Display Grid. how to do it? i searched in help, it suggests use icommand to do this. but i dont know how to pass the select query result to HTML table.. please help me.
-senthil

Hi Senthil,
You can create an icommand query. You can then use the icommand retrieval methods to capture and manipulate the query data.
(http://help.sap.com/saphelp_xmii115/helpdata/en/Applet_Reference_Details/iCom
mand_Reference.htm)
Basically what we did was, use the getColumnCount() and getRowCount() methods, once you have these two numbers you can set two for loops and use String getValue(int ColID, int RowID) , within the for loops you can generate the inner html content and write the values either in a html table or html form (which is what we did). This seems to work well, I'm still playing around with it and may post this approach on sdn by end of this week.
Mahwish

How to pass back results of gATP from APO to R/3

Dear all,
we're currently working on a gATP implementation and face following open challenges for which we kindly ask you for your valuable support:
1.) We need to pass back the allocated CVC of the gATP (product allocation) check from APO to z-append fields of VBAP. In order to do that we implemented additional field catalog fields which are updated in one of the product allocation userexits on APO side. Using an enhancement of form MVERF_PRUEFEN in SAPFV45V the data which is passed back from APO to R/3 via field_catalog can be written into the respective VBAP fields. ONLY: this doesn't work for a "complete delivery only" customer/order as MVERF_PRUEFEN is not called in such a case.
---> Do you have any proposals where/how to implement the functionality to write back the results passed back by APO into VBAP fields?
2.) In case of incomplete confirmation (not enough qty) the "APO Product Availability Overview" screen appears. We do not want to show this screen in APO to our users. There should be just a warning message but not this full screen. Do you have any ideas how to turn off the screen (similar to what happens if the order is posted in background)
Thanks again for your great input and help!
M.

Dear Mohan,
thanks for your reply.
We actually use the functionality you described already for passing the required additional information from R/3 to APO. What we're currently searching, is a solution to pass back results (such as the allocated CVC or additional information from APO) from APO back to R/3 and store it there in VBAP-appends.
Thanks,
Maawdee
Edited by: Maawdee on Jun 25, 2010 9:18 AM

How to return the result set of multiple select statements as one result set?

Hi All,
I have multiple select statements in my stored procedure that I want to return as one result set
for instance
select id from tableA
union
select name from table b
but union will not work because the result sets datatypes are not identical so how to go about this ?
Thanks

You have to CAST or CONVERT (or implicitly convert) the columns to the same datatype. You must find a datatype that both columns can be converted to without error. In your example I'm guessing id is an int and name is a varchar or nvarchar.
Since you didn't convert the datatypes, SQL will use its data precedence rules and attempt to convert name to an int. If any row contains a row that has a value in name that cannot be converted to an int, you will get an error. The solution is
to force SQL to convert the int to varchar. So you want something like
select cast(id as varchar(12)) from tableA
union
select name from tableb
If the datatypes are something other that int or varchar, you must find a compatable datatype and then convert one (or both) of the columns to that datatype.
Tom

How to pass a result of SQL query to shell script variable

Hi all,
I am trying to pass the result of a simple SQL query that only returns a single row into the shell script variable ( This particular SQL is being executed from inside the same shell script).
I want to use this value of the variable again in the same shell scirpt by opening another SQL plus session.
I just want to have some values before hand so that I dont have to do multiple joins in the actual SQL to process data.

Here an example :
SQL> select empno,ename,deptno from emp;
     EMPNO ENAME          DEPTNO
      7369 SMITH              20
      7499 ALLEN              30
      7521 WARD               30
      7566 JONES              20
      7654 MARTIN             30
      7698 BLAKE              30
      7782 CLARK              10
      7788 SCOTT              20
      7839 KING               10
      7844 TURNER             30
      7876 ADAMS              20
      7900 JAMES              30
      7902 FORD               20
      7934 MILLER             10
14 rows selected.
SQL> select * from dept;
    DEPTNO DNAME          LOC
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
$ cat my_shell.sh
### First query #####
ENAME_DEPTNO=`sqlplus -s scott/tiger << EOF
set pages 0
select ename,deptno from emp where empno=$1;
exit
EOF`
ENAME=`echo $ENAME_DEPTNO | awk '{print $1}'`
DEPTNO=`echo $ENAME_DEPTNO | awk '{print $2}'`
echo "Ename         = "$ENAME
echo "Dept          = "$DEPTNO
### Second query #####
DNAME_LOC=`sqlplus -s scott/tiger << EOF
set pages 0
select dname,loc from dept where deptno=$DEPTNO;
exit
EOF`
DNAME=`echo $DNAME_LOC | awk '{print $1}'`
LOC=`echo $DNAME_LOC | awk '{print $2}'`
echo "Dept Name     = "$DNAME
echo "Dept Location = "$LOC
$ ./my_shell.sh 7902
Ename         = FORD
Dept          = 20
Dept Name     = RESEARCH
Dept Location = DALLAS
$

Can we pass temporary result set to the procedure?

Hi,
The result set is stored in a temporary storage. Can we pass that resultset to the procedure?
Thanks and regards
Gowtham Sen.

I'm still unclear just what this result set is... Is is a table or a cursor or something else?
If you imply the physical result set of a SQL query, there is no such thing in Oracle. Oracle does not create and store a result set in memory containing the rows of the SQL SELECT. Creating such sets in memory does not scale. A single SELECT on such a database can kill the performance of the entire database by exhasuting all memory with a single large physical result set.
Oracle "results" live in the database cache (residing in the SGA). Rows (as data blocks) are paged into and out of this case as demand dictates. When PL/SQL code, for example, fetches a row, the SQL engine grabs the row from the db cache (SGA) and copies it to the PGA (the private memory area of the PL/SQL process). The row also may not yet exist in the db cache - in which case it needs a physical read from disk to get the data block containing that row into the db cache (after which it is copied to the PGA).
A PL/SQL process can do a bulk fetch - e.g. fetch a 100 rows from the SQL query/cursor at a time. In that case, a 100 rows are copied from the SGA db cache to the PGA.
At no time is there are single large unique and dedicated memory struct in the SGA that contains the complete "result set" of a SQL query.
Once you have fetched that row, that is it. Deal is done. You cannot reverse the cursor and fetch the row again. After you have fetched the last row in that cursor, you cannot pass that cursor to another process - the cursor is now empty. That other process cannot rewind the cursor and start fetching from the 1st row again. You will need to pass the SQL to that process in order for it to create its own cursor - also keeping in mind that in between the rows can have changed and that this other process could now see different results with its cursor.
If you want to create such a physical temporary result set that is consistent and re-usable, you can use a temporary table - and insert the results of the SELECT into this temp table for further processing. This temp table is session specific and is auto destroyed when the session terminates.
A comment though - it sounds like you're approaching the date warehouse processing (scrubbing, transformation and loading of data) as a row-by-row process.
That is a flawed approach. Row-by-row processing does not scale. One should deal with data sets. Especially when the volumes are large. One should also attempt to perform minimal passes through a data set. Processing a bunch of rows, then passing that rows to another process to do some processing on the same rows.. this means multiple passes through the same data. That is very inefficient performance and resource wise.

How to use same RESULT SET for two different events

hello friends,
I need to use same result set for two different events. How to do it.
here My code,
private void jComboBox1ItemStateChanged(java.awt.event.ItemEvent evt) {
// TODO add your handling code here:
try
String selstate,selitem;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:tourismdatasource","sa","");
selstate="select * from tab_places where state=?";
PreparedStatement ps=con.prepareStatement(selstate);
ps.setString(1, jComboBox1.getSelectedItem().toString().trim());
ResultSet rs=ps.executeQuery();
if(rs.next())
jTextField1.setText(rs.getString("place_ID"));
jTextField2.setText(rs.getString("place_name"));
jTextField3.setText(rs.getString("category"));
byte[] ba;
ba=rs.getBytes("image");
ImageIcon ic = new ImageIcon(ba);
jLabel6.setIcon(ic);
in=true;
catch(ClassNotFoundException cfe){JOptionPane.showMessageDialog(null, cfe.getMessage());}
catch(SQLException sqe){JOptionPane.showMessageDialog(null,sqe.getMessage());}
Now i need the same Result Set(rs), in another event(jButton6ActionPerformed),
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
} how do i get dat resultset,
help me out

One post wasn't enough?
{color:0000ff}http://forum.java.sun.com/thread.jspa?threadID=5246634{color}
db

How to execute entire result set of multiple sql statements via sp_executesql?

I have a query that generates multiple insert statements (dynamic sql). So when I execute this my result set is a table of sql insert statements (one insert statment per row in my source data table). Like so:
Select 'INSERT INTO [dbo].[Table_1] ([Col1]) VALUES (' + SrcData + ')' from SourceDataTbl
How can I completely automate this and execute all these sql statements via sp_executesql?
My plan is to completely automate and execute all this via an SSIS package.
As always any help is greatly appreciated!
fyi- This is a very simple version of what I am trying to do. My query probably plugs in 20+ values from the SourceDataTbl into each of the sql insert statements.

Ah, a small error in Visakh's post, which I failed to observe, and then I added one on my own.
DECLARE @SQL Varchar(max)
SELECT @SQL =
(SELECT 'INSERT INTO [dbo].[Table_1] ([Col1]) VALUES (' + SrcData +
')' + char(10) + char(13)
from SourceDataTbl
FOR XML PATH(''), TYPE).value('.', 'nvarchar(max)')
EXEC sp_executesql @SQL
Without ", TYPE" FOR XML returns a string when assigned to a variable. The TYPE thing produces a value of the XML data type, so that we can apply the value method and get string out of the XML.
And why this? Because:
DECLARE @str nvarchar(MAX)
SELECT @str = (SELECT 'Kalle Anka & co' FOR XML PATH(''))
SELECT @str
SELECT @str = (SELECT 'Kalle Anka & co' FOR XML PATH(''), TYPE).value('.', 'nvarchar(MAX)')
SELECT @str
Although the data type is string when , TYPE is not there, it is still XML and characters special to XML are enticised.
Confused? Don't worry, for what you are doing, this is mumbo-jumbo.
Erland Sommarskog, SQL Server MVP, [email protected]

How to hold the result set

     We have a GUI swing screen in which we have navigation buttons.
     when the user clicks the previous ,next, last,first buttons we have to show the records accordingly.
     The min. size of the database is around 1 million.and each row has 60 columns.
     Our approach is screen--->servlet-->ejb beans --->database.
     since the database is huge how to hold the values, and where, without affecting the performance.
     If we get the resultset it holds all the data.since the data size is huge,we are looking for a solution.The user may browse through the data ,edit the data and delete the data.
     we have to perform accordingly. Also, if, for example, user1 is seeing record no.1 & user 2 has modified record no.3 in the meanwhile, when user1 goes to record no.3, he should see the
     modified record. In short, the user should always see the latest values.
     please give us the best approach to solve this problem.
Also this is in a multi user environment.

It seems like you need to look at threads to update current values in the display and narrow the result set that you retrieve to match the criteria needed for display. You might consider making the method to change values a syncronized one.

How to - extract query result set in CSV and make multiple files if result set is huge.

I have a query which returns millions of rows. I need to extract those rows in CSV files. Having said that i want to keep these files under a limit of 500 MB . Result set can be distributed among multiples files but each file can not be > 500 MB in size.
How to achieve this?

You may use this standard! procedure from Blushadow and produce something useful for your need. https://community.oracle.com/message/6499123#6499123

How to pass a result set as an output parameter

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