How to pass record set as procedure parameter.

Hi All,
I have a requirement, I want to pass the records that are fetched from a cursor to a procedure as a parameter.
I dont want to use it inside the loop as we do it normally, as i might get huge volume of records using cursor, as a result the procedure also will be called number of times inside the loop.
Can you suggest me the logic along with sample code?
Thanks
Suresh

GSKumar wrote:
I have a requirement, I want to pass the records that are fetched from a cursor to a procedure as a parameter.A cursor outputs rows - not "records".
I dont want to use it inside the loop as we do it normally, as i might get huge volume of records using cursor, as a result the procedure also will be called number of times inside the loop.
Can you suggest me the logic along with sample code?How else do you want to do it? If there are a million rows returned by the cursor, it means a million executions of that procedure - once for every row.
This will be slow. And the primary reason is that executing a PL/SQL procedure (or any other code unit) for a million times, will be slow. Changing the cursor interface (from an implicit cursor to a ref cursor for example) does not change the fact there needs to be a million PL/SQL procedure executions - and does not make anything faster. To fetch rows from a cursor needs to a loop. Period.
There are two basic ways to address this issue at hand.
Use SQL and not PL/SQL. Instead of using PL/SQL code and logic, use SQL code and logic. This will be faster as the PL/SQL engine no longer plays a role and a million rows do not have to be send from the SQL engine to the PL/SQL engine. Instead that million rows are processed internally in the SQL engine - which will be faster. And which will provide scalable options such as using parallel query.
Use "multi-threaded" PL/SQL. Assuming the PL/SQL code and logic are too complex to be done in SQL, the next best choice is PL/SQL. However, a single serialised PL/SQL process going through a million rows will be slow and will not scale. If parallel PL/SQL can be used, then 20 PL/SQL processes can each do 50,000 rows - as oppose to having to do a million rows.
There are two options to "multi-thread" PL/SQL code. You can use DBMS_PARALLEL_EXECUTE (11g). You can use a parallel pipelined table function (10g and higher).

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How to Pass Record Group to Reports Server ?

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or am I missing something.
there is a section on it.
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hi,
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thanks.
stalin.

hi,
tables : mara.
data : begin of itab_mara occurs 0,
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<b><REMOVED BY MODERATOR></b>
Message was edited by:
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How to pass class object as in parameter in call to pl/sql procedure ?

hi,
i have to call pl/sql proecedure through java. In pl/sql procedure as "In" parameter i have created "user defined record type" and i am passing class object as "In" parameter in call to pl/sql procedure. but it is giving error.
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793059 wrote:
I want to pass a cursor to a procedure as IN parameter.You can use the PL/SQL type called sys_refcursor - and open a ref cursor and pass that to the procedure as input parameter.
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You also need to ask yourself whether this approach is a logical and robust one - it usually is not. The typical cursor processing template in PL/SQL looks as follows:
begin
open cursorVariable;
loop
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    loop
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    end loop;
    ..etc..
    exit when cursorVariable%not_found;
end loop;
close cursorVariable;
end;

How to pass a cursor as IN parameter to a procedure

Hello
I want to pass a cursor to a procedure as IN parameter.
See the below piece of code:
Cursor mycur is select * from table_name;
Procedure myproc(mycur IN ...)
begin
fetch mycur into v_rec;
{want to do some updates here}
end;
Please suggest how can I pass the cursor?
Thanks in advance !!!!

793059 wrote:
I want to pass a cursor to a procedure as IN parameter.You can use the PL/SQL type called sys_refcursor - and open a ref cursor and pass that to the procedure as input parameter.
Note that the SQL projection of the cursor is unknown at compilation time - and thus cannot be checked. As this checking only happens at run-time, you may get errors attempting to fetch columns from the ref cursor that does not exist in its projection.
You also need to ask yourself whether this approach is a logical and robust one - it usually is not. The typical cursor processing template in PL/SQL looks as follows:
begin
open cursorVariable;
loop
    fetch cursorVariable bulk collect into bufferVariable limit MAX_ROWS_FETCH;
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    loop
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    end loop;
    ..etc..
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end loop;
close cursorVariable;
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Passing values to parameter id
set parameter id 'VKS' field kschl.
set parameter id 'VKO' field vkorg.
set parameter id 'VTW' field vtweg.
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Effect
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LOW (length 45),
HIGH (length 45).
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hi,
I have created following procedure. It takes input parameter and selects some records in EMP table based on condition.
How to pass the output from this procedure to another procedure to manipulate the selected records further.
Do I need to pass REF CURSOR or RECORD ?
Thanks
===================================================
create or replace procedure empdetails(pid IN number)
is
type ref_cur is REF CURSOR;
rc ref_cur;
type myrec is RECORD(id number, name varchar2(15), sal number);
rec myrec;
begin
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don123 wrote:
I have created following procedure. It takes input parameter and selects some records in EMP table based on condition.
How to pass the output from this procedure to another procedure to manipulate the selected records further.
Do I need to pass REF CURSOR or RECORD ?Record. The bulk collection approach is useful if you want to use the collection subsequently as a bind variable for bulk binding. But assuming you simply want to crunch data, the minimalistic approach would be:
SQL> declare
2          procedure ProcessEmp( e emp%RowType ) is
3          begin
4                  dbms_output.put_line( 'processing employee..'||e.ename );
5          end;
6 begin
7          for e in(select * from emp order by 1) loop
8                  ProcessEmp(e);
9          end loop;
10 end;
11 /
processing employee..SMITH
processing employee..ALLEN
processing employee..WARD
processing employee..JONES
processing employee..MARTIN
processing employee..BLAKE
processing employee..CLARK
processing employee..SCOTT
processing employee..KING
processing employee..TURNER
processing employee..ADAMS
processing employee..JAMES
processing employee..FORD
processing employee..MILLER
PL/SQL procedure successfully completed.
SQL> An implicit bulk collect is done by the FOR loop, courtesy of the PL/SQL optimiser. As the procedure ProcessEmp() does not perform SQL processing itself (e.g. using employee data to fire off UPDATE, DELETE or INSERT SQL statements), a collection is not really needed as it would not contribute to the procedure's performance.
If however nested SQL statements are fired from inside that cursor fetch loop, using a collection would enable these SQLs to make use of bulk binding.
However, this approach ALWAYS need to be question, examined and validated - as a single SQL can often be used, combining the outer read/fetch loop (SELECT), with the nested SQLs (UPDATE/INSERT) done - using the MERGE or INSERT..SELECT statements for example.
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If a post answers your question, please click "Mark As Answer" on that post or
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How to pass an object as a parameter

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