How to descrbe a ref cursor from a PL/SQL prog?

Hi,
here is a sample of the my problem
let suppose a table country :
create table country(country_code VARCHAR2(3), country_name VARCHAR2(50));
then a package containing different procedures among them, this one :
PL/SQL prog
create or replace package country_pkg as
type rec1 is ref cursor return country%rowtype;
Procedure get_all_countries(rec in out rec1);
blablabla ...
END country_pkg;
in the package body, i have the following code :
create or replace package body country_pkg as
procedure get_all_countries(rec IN OUT rec1) is
begin
if not rec%open then
open rec for select * from country order by country_name;
end if;
exception
when NO_DATA_FOUND then
close rec;
end get_all_countries;
blablabla....
end;
Then in the C program
(*proc)->request->command = "begin get_all_countries(:rec); end;"
checkerr(&connect, \
     OCIStmtPrepare(connect->stmthp,\
     connect->errhp,\
     (*proc)->request->command,\
     strlen((*proc)->request->command),\
     OCI_NTV_SYNTAX, OCI_DEFAULT));
checkerr(&connect, \
     OCIHandleAlloc((dvoid*)(connect->envhp),\
     (dvoid**) &((*proc)->stmthp), OCI_HTYPE_STMT,
(size_t) 0,\
     (dvoid**) 0));
bndhp = (OCIBind**) g_malloc0((*proc)->argnum*sizeof(OCIBind*));
for(i = 0; i < (*proc)->argnum; i++)
switch ((*proc)->desc->type)
case 102:
checkerr(&connect,
OCIBindByPos(connect->stmthp, &bndhp[j],
connect->errhp,
     i+1,&((*proc)->stmthp), (sb4) 0,
     SQLT_REF, (dvoid*) 0, (ub2*) 0, (ub2*) 0,
(ub4) 0,
     (ub4*) 0, (ub4) OCI_DEFAULT));
default:
some code ....
checkerr(&connect, \
     OCIStmtExecute(connect->svchp, connect->stmthp,\
     connect->errhp, 1, (ub4) 0, (OCISnapshot*) 0,\
     (OCISnapshot*) 0, OCI_DEFAULT));
parm_status = OCIParamGet(connect->stmthp, OCI_HTYPE_STMT,connect->errhp, (dvoid**)&arg, 0);
while(parm_status == OCI_SUCCESS)
OCIAttrGet((dvoid*) arg, OCI_DTYPE_PARAM,
(dvoid*)type,0, (ub4) OCI_ATTR_NUM_PARAMS,
connect->errhp);
counter++;
parm_status = OCIParamGet(connect->stmthp,
OCII_HTYPE_STMT,connect->errhp,
(dvoid**)&arg, counter);
This piece of code doesn't work as 'arg' is always NULL
and OCIParamGet retruns OCI_SUCCESS.
I'm certainly missing something but I don't see what. Could anyone help me to get that piece of code working?
regards,
Raphael

unfortunately, not yet!
I dropped the matter for now, I'll come back on it later.
On your side, let me know if you find something interesting on that topic by posting a message here.

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adym

Hi michaels,
I've put your solution in place, but can't seem to get it to run. The two types were moved out of the package and into real types as you said. Here's the function, for brevity, I've remove some of the less important code:
function ian_se_fetch return sys_refcursor
is
    p_csr_events            sys_refcursor;
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        select
             se_id
    ...removed for brevity...
    /* END : csr_items */
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    ian_se_tbl     ian_se_table;
    l_lng_index    number;
    l_lng_linked   number;
    l_lng_id       number;
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        where src.linked_se_id = the_item.se_id;
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                ,updated
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                                  ,'1',''
                                  ,decode(impact
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                                      ,':' || impact
                              )                           impact
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            ian_se_tbl(l_lng_index).linked_se_id            := ian_se_row.linked_se_id;
            ian_se_tbl(l_lng_index).submitted               := ian_se_row.submitted;
            ian_se_tbl(l_lng_index).updated                 := ian_se_row.updated;
            ian_se_tbl(l_lng_index).closed                  := ian_se_row.closed;
            ian_se_tbl(l_lng_index).segroup                 := ian_se_row.segroup;
            ian_se_tbl(l_lng_index).incident_start_time     := ian_se_row.incident_start_time;
            ian_se_tbl(l_lng_index).business_units_affected := ian_se_row.business_units_affected;
            ian_se_tbl(l_lng_index).officenum               := ian_se_row.officenum;
            ian_se_tbl(l_lng_index).sedetails               := ian_se_row.sedetails;
        end if;
    end loop;
     * REF CURSOR : Open the ref cursor on the dataset...
    if ( nvl(ian_se_tbl.last,0) = 0 ) then
        p_csr_events := null;
    else
        open p_csr_events for
        select *
        from table (cast ( ian_se_tbl as ian_se_table ));
    end if;
    return p_csr_events;
end;Here's the test. I keep getting the same error ORA-06530:
SQL> variable v refcursor;
SQL> exec :v:=pkg_ian.ian_se_fetch;
BEGIN :v:=pkg_ian.ian_se_fetch; END;
ERROR at line 1:
ORA-06530: Reference to uninitialized composite
ORA-06512: at "N0002501.PKG_IAN", line 131
ORA-06512: at line 1
SQL> print v
ERROR:
ORA-24338: statement handle not executedOther things I tried:
- The ian_se_fetch() function was a procedure using an in out parameter...same error.
- Wrote a small anonymous block and tried to LOOP/FETCH. Same ORA-06530 error.
P.S. Line 131 of pkg_ian is the SELECT ... INTO ian_se_row.se_id, ...
Any help would be greatly appreciated,
tia,
adym
Message was edited by:
alink

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Create a cursor from a PL/SQL variable or an external file

Dear friends,
is there a way for me to make Oracle Forms read a cursor from a PL/SQL variable, or an external file? Let's suppose we have the code below:
DECLARE
cursor c_values is select * from my_table;
r_values c_values%ROWTYPE;
BEGIN
for r_values in c_values loop
do_something;
end loop;
END;
In the situation described above, could I create "select * from my_table" from a PL/SQL variable (it could be something like p_cursor = 'select * from my_table'), or an external file - for example, make my form read the contents of c:\my_select.sql , where we see the "select * from my table" text?
My question comes because I need to export data from select instructions that were dinamically created inside the form - that is, via PL/SQL -, and I don't want to rewrite it, but I'll have to do it if I have no choice. Your help will be greatly appreciated.
Best regards,
Franklin
Edited by: franklinbrasil on 12/03/2009 11:33
Edited by: franklinbrasil on 12/03/2009 11:35

Dear friends,
I am using DBMS_SQL package, which solved my problem. Please let me explain it better, if it's not clear.
I have some PL/SQL blocks inside my form, which creates SQL queries dinamically, and a dinamically created SQL is stored into a VARCHAR2 variable. These SQL queries are exported for use in Oracle Graphics, but since OG is not being developed by Oracle anymore then I am trying to find a substitute for it.
So I thought about creating an option for the final user: he/she can choose exporting data into Microsoft Excel, and user does what he/she wants, creating a customized graphic. Exporting into Excel works finely, with no problems at all - I could find a routine by searching on the web.
My goal was to use the same queries created above to export data dinamically to Microsoft Excel, and I absolutely don't want to rewrite all these dinamically created queries - one which works dinamically, other with no flexibility inside my form. Worse than it, I have many other dinamically created queries, and I obviously don't want to rewrite them all - any maintenance in this form would be terrible, with each SQL instruction written twice.
Since all dinamically created SQL instructions are stored inside a VARCHAR2 variable, I thought about reusing the same SQL, as explained above - and here we have your suggestions about using a ref cursor, execute immediate, and so on. And (answering Andreas) query structure is always based on the same table, but its structure changes a lot, depending on what the final user chooses in a drop-down list (it's a list of graphics options, where final user chooses one option, and form must mount SQL dinamically, based on user's choice).
By using your explanations, I could find DBMS_SQL solution here: http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adg09dyn.htm#26799
. Please notice that I had to change DBMS_SQL.native into 1 for it to work in my form. I'll mark all your answers as helpful because I can use them both for database and form purposes.
If my message was not clear enough, please tell me and I'll try to make it more clear.
Best regards,
Franklin

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How to get second maximum salary from employee table(sql query)

how to get second maximum salary from employee table(sql query)

dude there is no matter of structure .........that user already said its from employee table ...............its basic table in sql and there is no need to specify the table structure
.........i think u got my point I think you are the one who didn't understand Sarma's point.
Give a man a fish and you feed him once. Teach a man how to fish and you feed him a life long.
>
and the query is
select max(sal) from emp where sal<(select max(sal)
from emp);
this will give the 2nd max salary from the emp tableBtw: You solution is bad, because it needs to scan and sort the table emp twice. And a better solution has been given already.
Message was edited by:
Sven W. - reordered statements

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