refcursor or object?

Working on a stored procedure that is called by the java application.

I do not know which of the following option is better and in which case:

1 stored procedure return/accepting a SYS_REFCURSOR parameter
or
2. at the level of schema:

TYPE AS OBJECT emp_attrb_obj (attribute_type_id NUMBER (10),)
attribute_val VARCHAR2 (50)
);
create or replace
TYPE emp_attrb_type AS THE emp_attrb_obj TABLE;

and then have a stored procedure accepts or returns a parameter of type emp_attrb_type

Thank you
RN

RN says:
Working on a stored procedure that is called by the java application.

I do not know which of the following option is better and in which case:

1 stored procedure return/accepting a SYS_REFCURSOR parameter
or
2. at the level of schema:

TYPE AS OBJECT emp_attrb_obj (attribute_type_id NUMBER (10),)
attribute_val VARCHAR2 (50)
);
create or replace
TYPE emp_attrb_type AS THE emp_attrb_obj TABLE;

and then have a stored procedure accepts or returns a parameter of type emp_attrb_type

Thank you
RN

Well, a java application is unlikely to be able to pass a ref cursor, your procedure will therefore not need to accept a. Other than that, it really depends on how the data that you expect to get past back.

I have a number of stored procs called by java applications that return a single row in a table. In these cases, I often return an object, since it saves a step for Java guys who can use it more or less directly. Is there is not a limit on the number of rows returned exlplicit, then I would always return a refcursor.

If the java app must pass a set of values in the stored procedure (for example get this list of employees), then I would have java pass an array of objects (an array of records) to the stored procedure. It keeps me from having to parse a delimited string of values.

John

Tags: Database

Similar Questions

DDL lock on the object in a SELECT statement?

Environment:
Oracle 11.2.0.4 EE on Solaris
My client called me when she was trying to create a new index on a table and the process was just hanging. Also, she was not able to DELETE an existing index on the same table, which deal with hang them as well.
After reviewing the advice DBA_DDL_LOCKS, I found a DDL lock on the target of the index table.
The DDL lock is held by a process doing a SELECT on the table and this process worked for several hours.
There was no entry in V$ LOCKED_OBJECTS for the table.
I don't know, yet, what other operations prior to the SELECT statement in the offending process, I have not heard of the user yet.
I realize a DDL lock is placed on objects to prevent changes while specific operations are directed against this object, i.e. the DROP, UPDATE, compile the PACKAGE, etc.
Question: Is a select also place a DDL lock on a table at a level that would avoid a new index is created or an existing index having fallen?
Thank you very much for your comments!
Any reference to the resolution is greatly appreciated.
I searched some Concepts Developers Guide, SQL, even Google reference Guide.
-gary

> My question is now, this lock persists for the duration of the running query?

Easy enough to show that it is not.

Session1:
```
SQL> create table foo(bar number);     

Table created.                         

SQL> insert into foo values(1);       

1 row created.                         

SQL> commit;                           

Commit complete.                       

SQL> variable x refcursor
SQL> variable a number
SQL> begin
  2  open :X for select bar from foo;
  3  end;
  4  /                                 

PL/SQL procedure successfully completed.
```
Session 2:
```
SQL> drop table foo;

Table dropped.     
```
Note that I was able to remove the table even if select is still 'in progress' - the cursor is open.

If you really want to blow your mind, go back to the session 1:
```
SQL> begin
  2  fetch :X into :a;
  3  end;
  4  /                                

PL/SQL procedure successfully completed.

SQL> print a                          

         A
----------
         1       
```
The picture has gone, but I can always look for him. However, try again:
```
SQL> /
begin
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-00942: table or view does not exist          
```
Note that the forum software is stupid. is: followed by x. seems it's really important to have a smiley to lovey eyes in a technical forum.

Edit - and when you format the SQL code, it is removed completely and render invisible... silly.

I edited my code to use: X and the problem disappeared...

Refcursor in the procedure

Hi all
There will be no effect in performance if we declare refcurosr with suspicion NOCOPY parameter in a Stored procedure procedure/package?
AFAIK variable refcursor who will make reference to the calling environment will hold just pointer not data and so avoid a NOCOPY effect.
Thank you!!

DS says:

One of my senior team members asked me to NOCOPY in all existing procedures where refcursor is returned as a parameter in my output project.

I told him that this will not add any performance improvement and has no effect.

I did it, because I was forced to do so.

Want to just check and take the advice from here in this forum.

I still have the document (in e-mails and in the procedure itself at the top) all these changes so that the future code-reviewers know EXACTLY why this change has been made and who authorized it. Probably you are asking your "senior" you say the reasons to support the change that they requested; You should document those as well.

Sounds like your "senior" team member is not so superior after all. You can use this as a topic of discussion in your dev group.

See the doc of the PL/SQL language.

http://docs.Oracle.com/CD/B28359_01/AppDev.111/b28370/tuning.htm#i48500

Calls to PL/SQL Tuning subprogramme with NOCOPY hint

By default, OUT and IN OUT parameters are passed by value. The values of a IN OUT settings are copied before the delivery of the subprogramme. During the execution of the subprogramme, temporary variables to maintain the output parameter values. If the subprogram exits normally, these values are copied to the actual parameters. If the subprogram exits with an unhandled exception, the original settings are unchanged.

When the parameters represent structures of large data such as collections, records and instances of object types, this reproduction slows down execution and uses memory. In particular, this overload applies to each call to a method of the object: temporary copies are made of all attributes, so that any changes made by the method are only apply if the method ends normally.

To avoid this overload, you can specify the NOCOPY trick, which allows the PL/SQL compiler to pass OUT and IN OUT parameters by reference. If the subprogram exits normally, the action is the same as usual. If the subprogramme leaves at the beginning with an exception, the values of OUT and IN OUT parameters (or the attributes of the object) can still change. To use this technique, check that the subroutine handles all exceptions.

Note the reference to the "large data structures. As you already know a REFCURSOR isn't a large data structure, so will not use NOCOPY.

The most important side effect is that, as noted in the last paragraph above, the characteristics of the 'exit' are modified if you use NOCOPY.

Point out that the last clause in your "senior": ENSURE THAT THE subprogram MANAGES all THE EXCEPTIONS.

Normally (i.e. without using NOCOPY) a REFCURSOR lucifera is a parameter OUT will NOT have a value if the procedure stops with an exception if the caller is unable to use it eventually. Maybe this isn't the case if you use NOCOPY.

Generally however, the use of NOCOPY would simply be an amendment unnecessary, but harmless.

Insert the output of a refcursor procedure into a table

Hello

I met a scenario in which I need to put the insert records returned by a procedure using refcursor, at a table.

I followed the instructions in PL/SQL 101: understanding Refcursor (PL/SQL 101: understanding Ref Cursor am unfortunately still not able to do so.)

Here is my sample codes. (Copied here as advised by the new Member)

create or replace PROCEDURE TEST_PROCEDURE1 ( p_cursor OUT SYS_REFCURSOR)
AS
BEGIN
OPEN p_cursor FOR
SELECT C1,C2
FROM TEST_USER.test_table4procedure;
END;

I check the result using the following statement, which gives results.

variable rc refcursor;
exec TEST_USER.TEST_PROCEDURE1 (:rc)
print rc;

Now, I want to be able to use the output and insert the data into a table. That's how I came across this thread.

I created the types and function...

create or replace type test_user.type_table1 as object(var1 varchar2(50),var2 varchar2(50));
create or replace type test_user.type_table2 as table of test_user.type_table1;

create or replace function test_user.test_function1 (rc in sys_refcursor )
return test_user.type_table2 is
v_emptype test_user.type_table2 := test_user.type_table2(); -- Declare a local table structure and initialize it
v_cnt number := 0;
v_rc sys_refcursor;
v_var1 varchar2(20);
v_var2 varchar2(20);
begin
v_rc := rc;
loop
fetch v_rc into v_var1, v_var2;
exit when v_rc%NOTFOUND;
v_emptype.extend;
v_cnt := v_cnt + 1;
v_emptype(v_cnt) := test_user.type_table1(v_var1, v_var2);
end loop;
close v_rc;
return v_emptype;
end;

After that, I want to be able to view the records by using the function... so I used the instructions below...

variable rc refcursor;
exec TEST_USER.TEST_PROCEDURE1 (:rc)
SELECT * FROM TABLE(test_user.test_function1(:rc));

However, it fails with the error

Error from line 3 in order:
SELECT * FROM TABLE (test_user.test_function1 (:rc))
Error report:
SQL error: Missing a setting IN or OUT to index: 1

Help, please...

Your code does not work for a simple reason. SYS_REFCURSOR parameters must be in IN OUT mode. Check if the RC is open when he switched mode:

create or replace type type_table1 as object(var1 varchar2(50),var2 varchar2(50))
/
create or replace type type_table2 as table of type_table1
/
create or replace PROCEDURE TEST_PROCEDURE1 (p_cursor IN OUT SYS_REFCURSOR)
AS
BEGIN
OPEN p_cursor FOR
SELECT ENAME,JOB FROM EMP;
END;
/
create or replace function test_function1 (rc in sys_refcursor )
return type_table2 is
v_emptype type_table2 := type_table2(); -- Declare a local table structure and initialize it
v_cnt number := 0;
v_var1 varchar2(20);
v_var2 varchar2(20);
begin
if rc%isopen
  then
    dbms_output.put_line('rc is open');
  else
    dbms_output.put_line('rc is not open');
 end if;
loop
fetch rc into v_var1, v_var2;
exit when rc%NOTFOUND;
v_emptype.extend;
v_cnt := v_cnt + 1;
v_emptype(v_cnt) := type_table1(v_var1, v_var2);
end loop;
close rc;
return v_emptype;
end;
/
variable rc refcursor
exec TEST_PROCEDURE1(:rc)
set serveroutput on
SELECT * FROM TABLE(test_function1(:rc))
/
SELECT * FROM TABLE(test_function1(:rc))
                    *
ERROR at line 1:
ORA-01001: invalid cursor
ORA-06512: at "SCOTT.TEST_FUNCTION1", line 15

rc is not open
SQL>

Now IN OUT parameter edit mode:

set serveroutput off
create or replace function test_function1 (rc in out sys_refcursor )
return type_table2 is
v_emptype type_table2 := type_table2(); -- Declare a local table structure and initialize it
v_cnt number := 0;
v_var1 varchar2(20);
v_var2 varchar2(20);
begin
if rc%isopen
  then
    dbms_output.put_line('rc is open');
  else
    dbms_output.put_line('rc is not open');
 end if;
loop
fetch rc into v_var1, v_var2;
exit when rc%NOTFOUND;
v_emptype.extend;
v_cnt := v_cnt + 1;
v_emptype(v_cnt) := type_table1(v_var1, v_var2);
end loop;
close rc;
return v_emptype;
end;
/
variable rc refcursor
exec TEST_PROCEDURE1(:rc)
set serveroutput on
declare
v_emptype type_table2 := type_table2();
begin
v_emptype := test_function1(:rc);
end;
/
rc is open

PL/SQL procedure successfully completed.

SQL>

Problem is that you can't call the procedure/function with parameters in/out OUT of SQL.

SY.

How to store refcursor in collection

Hello

Storing refcursor values in the collection, I get this error
The game results or the query variables return types do not match.

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi

{code
-drop type patdetail_tab;
-drop type patdetail_obj;
-drop pat table;
-drop table t_pat;

CREATE or REPLACE TYPE patdetail_obj
AS
OBJECT (patid varchar2 (20), supplierid number)
/

CREATE or REPLACE TYPE patdetail_tab AS TABLE OF THE patdetail_obj;
/

(Pat) CREATE TABLE
patid varchar2 (25).
Vendor number
);

/

INSERT INTO pat
(
patid, provider
)
VALUES ('A1', 1);

INSERT INTO pat
(
patid, provider
)
VALUES ('A2', 2);

COMMIT;

CREATE TABLE t_pat)
patid varchar2 (25).
Vendor number
);

/

DECLARE
vpatdetail patdetail_tab;
emp_cv sys_refcursor;
BEGIN
OPEN FOR Emp_cv
SELECT patid, provider
PAT;

Get the emp_cv COLLECT in BULK IN vpatdetail;

INSERT INTO t_pat
(
patid, provider
)
SELECT *.
TABLE (vpatdetail);

COMMIT;
END;

ORA-06504: PL/SQL: Return types of Result Set variables or query do not match
ORA-06512: at line 9



Please assist me 

Thanks

Alen

Well, I hope this is something much more complex than what you mentioned (or you do not want to use a SINGLE SQL statement to insert in...) Select * from...), but assuming that you that boiled down to make a test case easy for us (thanks!), here's a solution.

You must inform the database that you are using the object type you'll be mining block, the

         patdetail_obj(patid, supplier)

in the code below

DECLARE
   vpatdetail patdetail_tab;
   emp_cv sys_refcursor;
BEGIN
   OPEN emp_cv FOR
      SELECT
         patdetail_obj(patid, supplier)
      FROM pat;
   FETCH emp_cv BULK COLLECT INTO vpatdetail;

   INSERT INTO t_pat
   (
   patid, supplier
   )
   SELECT *
   FROM table (vpatdetail);
   CLOSE emp_cv;
   COMMIT;
END;

Call a procedure that returns a refcursor, use it in an another proc sql?
I have a procedure that returns a refcursor; How can I include this refcursor in a sql statement that is inside another procedure, or view etc.?

This is the kind of foolery, I tried so far (myproc1 returns a ref cursor):

create or replace procedure myproc2
(
slider ref RC
)
AS
RC1 of ref cursor;
Start
EXECUTE myproc1 (rc1).
Open rc for
Select rc1.* in the rc1;
end myproc2;
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Hello
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refcursor or object?

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