Pass REF CURSOR to Procedure and LOOP through it
Hi All,
I am trying to figure out how I can pass a ref cursor to a procedure and then loop through it. I have provided an example of what I am attempting to do...just not really sure how to open the ref cursor when it is passed ot the sproc and iterate through it?
Any info would be greatly appreciated.
Version:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi
PL/SQL Release 10.2.0.3.0 - Production
CORE 10.2.0.3.0 Production
TNS for Linux: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
Create Or Replace Package test_ref_pkg
AS
function get_ref_curs
RETURN SYS_REFCURSOR;
procedure process_ref_curs(
p_ref_cursor IN SYS_REFCURSOR
END test_ref_pkg;
Create Or Replace Package Body test_ref_pkg
AS
function get_ref_curs
RETURN SYS_REFCURSOR
IS
l_ref_curs SYS_REFCURSOR;
BEGIN
OPEN l_ref_curs FOR
Select 1 ID, 'Test 1' Name
From DUAL
UNION ALL
Select 2 ID, 'Test 2' Name
From DUAL;
END get_ref_curs;
procedure process_ref_curs(
p_ref_cursor IN SYS_REFCURSOR
IS
BEGIN
---NOT SURE WHAT TO DO TO ITERATE THROUGH THE REF CURSOR I AM PASSING INTO THIS SPROC?----
END process_ref_curs;
END test_ref_pkg;Thanks,
S
Edited by: ScarpacciOne on May 28, 2010 9:11 AM
---NOT SURE WHAT TO DO TO ITERATE THROUGH THE REF CURSOR I AM PASSING INTO THIS SPROC?----
-- MAYBE I AM SIMPLE, BUT HOW ABOUT FETCH???
-- if you start to yell, I will yell too!!!!
Sybrand Bakker
Senior Oracle DBA
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How to out Dynamic ref cursor from Procedure to Forms
Hi
I am trying to out Dynamic ref cursor from Procedure to Forms, But I am unable to do so. however cursor return the value within procedure but I am failed to capture the same in Forms
Pl advice suggestion if any, Here I am attaching full procedure for reference
CREATE PACKAGE winepkg
IS
TYPE wine IS RECORD ( mynumber number);
/* Define the REF CURSOR type. */
TYPE wine_type IS REF CURSOR RETURN wine;
END winepkg;
CREATE procedure find_wine
(col1_in in number,
c1 out winepkg.wine_type) as
vsql varchar2(1000);
cur sys_refcursor;
x number;
BEGIN
vsql:='select bo_id from bo_details where bo_details.bo_id = '||col1_in ;
open cur for vsql;
c1:=cur;
--fetch c1 into x;
--dbms_output.put_line(x);
END find_wine;
In front end forms
Declare
TYPE F is REF CURSOR;
CUR_F F;
rec number;
Begin
break;
find_wine( 1601480000011078,cur_f ) ;
Loop
fetch cur_f into rec ;
Message(rec ) ;pause;
exit when cur_f%notfound ;
End loop ;
exception
when others then
Message(sqlerrm) ;pause;
End ;yo can use
declare
c_cursor EXEC_SQL.CursType;
v_stmt varchar2(2000) = 'select a, b, c from mytab where cond1'; -- you can create this value dynamically
begin
c_cursor := Exec_SQL.Open_cursor;
EXEC_SQL.PARSE(c_articulos, v_stmt);
EXEC_SQL.DEFINE_COLUMN(c_articulos,1, v_colchar1, 30);
EXEC_SQL.DEFINE_COLUMN(c_articulos,2, v_colchar2, 15);
EXEC_SQL.DEFINE_COLUMN(c_articulos,3, v_colchar3, 30);
v_exec := EXEC_SQL.EXECUTE(c_cursor);
WHILE EXEC_SQL.FETCH_ROWS(c_cursor) > 0 LOOP
EXEC_SQL.COLUMN_VALUE(c_cursor,1,v_colchar1);
EXEC_SQL.COLUMN_VALUE(c_c_cursor,2,v_colchar2);
EXEC_SQL.COLUMN_VALUE(c_c_cursor,3,v_colchar3);
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EXEC_SQL.CLOSE_CURSOR(c_cursor);
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and WORKS IN FORMS 6 -
How return parameter ref Cursor from procedure using dynamic SQL?
I sorry, but i very need help.
I using Oracle 8.0.6
I need to return parameter of type ref Cursor from procedure.
create or replace package PlanExp is
type cursortype is ref cursor;
procedure ShowPlan (cursorparam out
cursortype.............);
end PlanExp;
create or replace package body PlanExp is
procedure ShowPlan (cursorparam out cursortype,
.............) Is
sql_str varchar2(1000);
sql_str_select varchar2(100);
sql_str_from varchar2(100);
sql_str_where varchar2(500);
Return_Code integer;
Num_Rows integer;
cur_id_sel integer;
tSum_Plan DBMS_SQL.NUMBER_TABLE;
tSum_Plan_Ch DBMS_SQL.NUMBER_TABLE;
tSum_Plan_Day DBMS_SQL.NUMBER_TABLE;
begin
/* calculating string variables ........... /*
sql_str := 'select ' || sql_str_select ||
'from ' || sql_str_from ||
'where ' || sql_str_where ||
'group by ' || sql_str_select;
cur_id_sel := dbms_sql.open_cursor;
dbms_sql.parse(cur_id_sel, sql_str, dbms_sql.native);
dbms_sql.define_array(cur_id_sel, 1, tSum_Plan, 20, 1);
dbms_sql.define_array(cur_id_sel, 2, tSum_Plan_Ch, 20, 1);
dbms_sql.define_array(cur_id_sel, 3, tSum_Plan_Day, 20, 1);
Return_Code := dbms_sql.execute(cur_id_sel);
delete from TEMP_SHOWPLAN;
Loop
Num_Rows := dbms_sql.Fetch_Rows(cur_id_sel);
dbms_sql.column_value(cur_id_sel, 1, tSum_Plan);
dbms_sql.column_value(cur_id_sel, 2, tSum_Plan_Ch);
dbms_sql.column_value(cur_id_sel, 3, tSum_Plan_Day);
if Num_Rows = 0 then
exit;
end if;
Exit When Num_Rows < 20;
End Loop;
dbms_sql.close_cursor(cur_id_sel);
end;
end PlanExp;
How return cursor (cursorparam) from 3 dbms_sql.column_value-s ?I am using Oracle 8.1.7, so I don't know if this will work in
8.0.6 or not:
SQL> CREATE TABLE test
2 (col1 NUMBER,
3 col2 NUMBER,
4 col3 NUMBER)
5 /
Table created.
SQL> INSERT INTO test
2 VALUES (1,1,1)
3 /
1 row created.
SQL> INSERT INTO test
2 VALUES (2,2,2)
3 /
1 row created.
SQL> INSERT INTO test
2 VALUES (3,3,3)
3 /
1 row created.
SQL> CREATE TABLE temp_showplan
2 (tSum_Plan NUMBER,
3 tSum_Plan_Ch NUMBER,
4 tSum_Plan_Day NUMBER)
5 /
Table created.
SQL> EDIT planexp
CREATE OR REPLACE PACKAGE PlanExp
IS
TYPE CursorType IS REF CURSOR;
PROCEDURE ShowPlan
(cursorparam IN OUT CursorType,
sql_str_select IN VARCHAR2,
sql_str_from IN VARCHAR2,
sql_str_where IN VARCHAR2);
END PlanExp;
CREATE OR REPLACE PACKAGE BODY PlanExp
IS
PROCEDURE ShowPlan
(cursorparam IN OUT CursorType,
sql_str_select IN VARCHAR2,
sql_str_from IN VARCHAR2,
sql_str_where IN VARCHAR2)
IS
sql_str VARCHAR2 (1000);
cur_id_sel INTEGER;
return_code INTEGER;
BEGIN
DELETE FROM temp_showplan;
sql_str := 'INSERT INTO temp_showplan '
|| ' SELECT ' || sql_str_select
|| ' FROM ' || sql_str_from
|| ' WHERE ' || sql_str_where;
cur_id_sel := DBMS_SQL.OPEN_CURSOR;
DBMS_SQL.PARSE (cur_id_sel, sql_str, DBMS_SQL.NATIVE);
return_code := DBMS_SQL.EXECUTE (cur_id_sel);
DBMS_SQL.CLOSE_CURSOR (cur_id_sel);
OPEN cursorparam FOR SELECT * FROM temp_showplan;
END ShowPlan;
END PlanExp;
SQL> START planexp
Package created.
Package body created.
SQL> VARIABLE g_ref REFCURSOR
SQL> EXEC PlanExp.ShowPlan (:g_ref, 'col1, col2,
col3', 'test', ' 1 = 1 ')
PL/SQL procedure successfully completed.
SQL> PRINT g_ref
TSUM_PLAN TSUM_PLAN_CH TSUM_PLAN_DAY
1 1 1
2 2 2
3 3 3 -
Passing Ref Cursor to Oracle Stored Procedure Via C#
Hi all,
I am new to oracle and stuck with an issue. I have three insert stored procedures for three different tables. Two of them have multiple rows to be inserted, which is currently done via iterating through each row and insert to db in C# code. My requirement is to merge these three procedures in one and instead of iterating from C# code send table rows as (ref cursor or collection) to procedure and the procedure will handle the rest.
I read that ref cursor only works if you're data is in database as it reference the memory but in my case data is build on client side.
I am using Oracle 11i and ASP.Net 2.0
Can any help me on this please?
Edited by: 929463 on Apr 23, 2012 12:38 AM929463 wrote:
I am new to oracle and stuck with an issue. I have three insert stored procedures for three different tables. Two of them have multiple rows to be inserted, which is currently done via iterating through each row and insert to db in C# code. My requirement is to merge these three procedures in one and instead of iterating from C# code send table rows as (ref cursor or collection) to procedure and the procedure will handle the rest.Why a single procedure? How is the procedure to determine the target table to insert the data into? And please - no dynamic SQL as that is 99% of the time wrong.
A ref cursor is something that PL/SQL creates - with the purpose of passing the cursor handle to your code. This enables the actual SQL statement for that cursor to be moved from client code, into a PL/SQL stored proc. It abstracts the client from having to understand SQL, understand the data model and so on. All clients use the same PL/SQL proc and thus the same code for creating that cursor. Thus no issue of some clients getting it half right or half wrong and dealing with data inconsistencies between clients.
The PL/SQL proc can be tuned and optimised, modified for catering for data model changes and so on. Without your client code having to be even recompiled as it is isolated against these server changes.
For all other interaction (running PL/SQL code, doing insert/update/delete/etc SQL statements), you need to create the cursor yourself in your code.
Also, the SQL engine only sees cursors. There are no differences between cursors. The client (e.g. PL/SQL) can call it a reference cursor, or an implicit cursor, or a DBMS_SQL cursor.. the SQL engine does not know that and does not care.
A ref cursor is simply a special type of client interface to a SQL cursor, allowing PL/SQL to create that SQL cursor and then pass the handle of that SQL cursor to other code to consume that cursor.
Okay, so if you want to insert data, you need in your code to create a cursor. This can be a SQL INSERT cursor - the actual insert statement. Or it can be a PL/SQL call - an anonymous PL/SQL code block that calls a stored proc that performs the insert (after applying validation and business logic).
The cursor will have one or more bind variables. Your client will pass values for these variables and the server-side code (SQL or PL/SQL) will be executed using this as variable data.
You can for example create a cursor as follows:
begin
DoFunkyInsert( :1, :2, :3 );
end;
{code}
3 bind variables are expected. You can now in the client build an array for each of these variables, containing a 100 values each (total of a 100 rows to insert). Do a single execute of the cursor, and tell Oracle that the bind is actually a 100 element array.
The complete array ships to Oracle - Oracle opens a loop and execute the cursor for each element in the array.
This is called bulk binding.
An alternative approach is to define the bind variable as a collection (a non-scalar value). And then code the PL/SQL procedure to open a loop and iterate through the collection/array, inserting a row per iteration.
The binding itself is more complex as your code know needs to understand Oracle object types and be able to define an array/collection that is a valid Oracle non-scalar data type.
The +Oracle Call Interface+ (OCI) is quite flexible in this regard. However, as you work via an abstraction layer (e.g. ADO, OleDB, ODBC, etc) your code is subject to whatever functionality this abstraction layer makes available to your code. And this is seldom includes all the power, functionality and flexibility of the (more complex) OCI itself. -
Problem passing REF CURSOR to JAVA STORED PROCEDURE
Hi,
I've written a small Java class with a static method and
imported that into Oracle 8i. The method expects a
java.sql.ResultSet object as parameter. According to the
documentation of Oracle, a REF CURSOR (cursor variable) maps to
java.sql.ResultSet in JDBC.
The definition of the Java Stored Procedure was accepted without
problems:
CREATE OR REPLACE PROCEDURE RESULTSETPASSINGTESTPROC (row
WASTypes.GenericCurType)
as language java
name 'sqlj.ResultSetPassingTest.testResultSetPassing
(java.sql.ResultSet)';
WASTypes is a package containing the definition of the generic
cursor:
CREATE OR REPLACE PACKAGE WASTYPES
is
TYPE GenericCurType IS REF CURSOR;
END WASTypes;
In a function I'm opening the cursor via
'Open cursorVariable for sqlStatement';
Then this cursor variable is passed to the java method and the
error ORA-03113 is shown.
I tried to solve the problem by changing the type of the
parameter to oracle.sql.REF without success.
Does anybody know what wents wrong?
Thanks in advance.
JanHi,
I've written a small Java class with a static method and
imported that into Oracle 8i. The method expects a
java.sql.ResultSet object as parameter. According to the
documentation of Oracle, a REF CURSOR (cursor variable) maps to
java.sql.ResultSet in JDBC.
The definition of the Java Stored Procedure was accepted without
problems:
CREATE OR REPLACE PROCEDURE RESULTSETPASSINGTESTPROC (row
WASTypes.GenericCurType)
as language java
name 'sqlj.ResultSetPassingTest.testResultSetPassing
(java.sql.ResultSet)';
WASTypes is a package containing the definition of the generic
cursor:
CREATE OR REPLACE PACKAGE WASTYPES
is
TYPE GenericCurType IS REF CURSOR;
END WASTypes;
In a function I'm opening the cursor via
'Open cursorVariable for sqlStatement';
Then this cursor variable is passed to the java method and the
error ORA-03113 is shown.
I tried to solve the problem by changing the type of the
parameter to oracle.sql.REF without success.
Does anybody know what wents wrong?
Thanks in advance.
Jan -
URGENT!!passing variables to ref-cursor stored procedures
I have build forms6 block base ona stored procedures with ref
cursor.
But....it's impossible to pass variables from block.item to
in-out parameter of ref cursor..to make a where clause for
example!!
I've tried all..but nothing happens..
Can someone help me?
Thanks..
nullManish Wadhwa (guest) wrote:
: Gigi (guest) wrote:
: : I have build forms6 block base ona stored procedures with ref
: : cursor.
: : But....it's impossible to pass variables from block.item to
: : in-out parameter of ref cursor..to make a where clause for
: : example!!
: : I've tried all..but nothing happens..
: : Can someone help me?
: : Thanks..
: >>
: It is not possible to send values as parameter to the stored
: procedure because, oracle uses the trigger query-procedure for
: calling the stored procedure and it does not entertain any
: changes to that trigger. This is a problem with block based on
: stored procedure, we have also tried it with table of records
: instead of ref cursor, but doesn't work.
: Manish
Thanks Manish..
i was afraid about that..
But ..i ask to myself(retoric question..) it's possible the
development oracle team build a "black box" like a stored
procedure with ref o table of records who permit to select
million of records in few second( i selected 5 million of records
in 2 seconds..) and cannot permit to passing variables to these
cursor.. every end users production forms must be working in
this way..I don't understand..
Gigi
null -
Problem in passing ref cursor values as parameter in where clau.Most Urgent
Problem:
1) I have used normal cursor (C_hubmsgid_set) with some select statement such as grouping and all.
After executing the query it will return some resultset to the specified cursor.
2) I am trying to use another cursor which is ref cursor but the problem is
I want to give all the resultset based on all the conditions to the ref cursor.
But the cursor will get only the last record due to overwriting .how to get all
the result set in a ref cursor like
cursor c1 is select .....
loop
open refcursor for
Select * from ....where condition
end loop
After this the refcursor( p_sysaudithistory_cur) which should have all the resultset matched by the where condition.
3. It should be java compatible one.
4. I am not able to match cursor row = IN Pameter value
Below is the query:
CREATE OR REPLACE PROCEDURE SP_TEST_audit_history2 (
p_start IN date,
p_end IN date,
p_msgcode IN varchar2,
p_partnername IN varchar2,
p_status IN varchar2,
p_locationname IN varchar2,
p_custbusunit IN varchar2,
p_sysaudithistory_cur OUT plutotypes.ref_cursor,
p_status1 OUT NUMBER) AS
l_status NUMBER := 0;
CURSOR C_hubmsgid_set IS
SELECT DISTINCT MAX(tfm.datetime) datetime, tfm.hubmsgid
FROM tfm_status tfm, vw_msgcode_part_locn vw
WHERE
tfm.datetime >= NVL(p_start, TO_DATE('01/01/1981','DD/MM/YYYY')) AND
tfm.datetime <= NVL(p_end, TO_DATE('31/12/9999','DD/MM/YYYY')) AND
tfm.msgcode LIKE NVL(p_msgcode,'%') AND
vw.msgcode = tfm.msgcode
AND vw.partnername LIKE NVL(p_partnername,'%')
AND tfm.status LIKE NVL(p_status,'%')
AND vw.locationname LIKE NVL(p_locationname,'%')
AND vw.custbusunit LIKE NVL(p_custbusunit,'%')
AND rownum < 250
GROUP BY tfm.hubmsgid
ORDER BY datetime DESC;
/* Loop through the Cursor */
BEGIN
BEGIN
OPEN p_sysaudithistory_cur
FOR
SELECT
tfm.hubmsgid ,
tfm.status || '-'|| nvl2(tfm.exception_id,'FAILED','OK') ,
tfm.datetime,
tfm.exception_id
FROM tfm_status tfm
WHERE tfm.hubmsgid = c_hubmsgids.hubmsgid /* here only i am getting error*/
AND tfm.datetime = c_hubmsgids.datetime
AND tfm.status like NVL(p_status,'%')
and rownum =1;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
l_status := 1;
END;
p_status1 := l_status;
END;
Thanks in advance
prasanth a.s.Please don't post duplicate questions. All it does is clutter the forums and result in fragmented threads and duplicate responses. Please see my response in the original thread at the link below.
Please solve this Refcursor issue PLEASE -
Hi,
Needed your inputs on approach to implement a job using dbms_scheduler.
We have around 2000 schemas. Each schema has a package with 2 procedures.
The requirement is to create a single job in SYS that would loop through each schema and run the procedures at a specific time ( once a day) and send email notification on success or failure.
Job script:
BEGIN
dbms_scheduler.create_job( job_name=> 'LOAD_EACH_SCHEMA_AUDIT_DATA',
job_type=>'PLSQL_BLOCK',
job_action=>'BEGIN sys.p_loadaudit;
END;',
start_date=>systimestamp,
repeat_interval=>'FREQ=MINUTELY;INTERVAL=1',
number_of_arguments=>0,
enabled=> true,
comments=>'Job repeat interval is every 5 mins' );
END;
Note: for testing purpose i have set repeat interval to minutely.
Procedure job will be executing:
Procedure sys.p_loadaudit:
CREATE OR REPLACE
PROCEDURE p_loadaudit
AS
v_count NUMBER:= 0;
lv_error_message VARCHAR2(4000);
vstmt VARCHAR2(4000);
BEGIN
FOR i IN
( SELECT username FROM dba_users WHERE username LIKE 'ABCFIRM%'
LOOP
vstmt:= 'begin ' || i.username || '.pkg_audit_info.p_load_coa; end;';
EXECUTE immediate vstmt;
vstmt:= 'begin ' || i.username || '.pkg_audit_info.p_load_am; end;';
EXECUTE immediate vstmt;
END LOOP;
EXCEPTION
WHEN OTHERS THEN
lv_error_message := 'Error in procedure p_loadaudit: ' || SQLCODE || ' -ERROR- ' || SUBSTR(
sqlerrm,1,300) || '*' || dbms_utility.format_error_backtrace;
raise_application_error(-20002,lv_error_message);
END p_loadaudit;
Example of one schema: SCHEMA_01
create or replace
PACKAGE pkg_audit_info
AS
type cursortype
IS
ref
CURSOR;
PROCEDURE p_load_COA;
PROCEDURE p_load_AM;
END pkg_audit_info;
create or replace
PACKAGE body pkg_audit_info
AS
PROCEDURE p_load_COA
AS
BEGIN
INSERT INTO TABLE1();
EXCEPTION
WHEN OTHERS THEN
lv_error_message := 'Error in procedure pkg_audit_info.p_load_COA: ' || SQLCODE
|| ' -ERROR- ' || SUBSTR(SQLERRM,1,300) || '*' || dbms_utility.format_error_backtrace;
RAISE_application_error(-20002,lv_error_message);
END p_load_COA;
PROCEDURE p_load_AM
AS
BEGIN
INSERT INTO TABLE2();
EXCEPTION
WHEN OTHERS THEN
lv_error_message := 'Error in procedure pkg_audit_info.p_load_AM: ' || SQLCODE ||
' -ERROR- ' || SUBSTR(SQLERRM,1,300) || '*' || dbms_utility.format_error_backtrace;
RAISE_application_error(-20002,lv_error_message);
END p_load_AM;
END pkg_audit_info;
Table1 and table1 exist in schema_01.
All 2000 schemas have same package.procedures.
Due to security reasons i have removed the actual code.
I was able to execute the job successfully. However, when a schema procedure (SCHEMA_01.pkg_audit_info.p_load_COA) throws an exception, the job fails and all transaction is rolled back.
Is there a way to loop through each schema and execute the related procedures. Even if exception happens, it should rollback only for that schema and continue the other schemas in the loop?
Please let me know if there is a better way to achieve this. Is the way i am handling exceptions in the job/procedure correct?
ThanksHi,
RAISE_APPLICATION_ERROR will cause the program to exit back to the caller, even if you place it in a block within the loop, so the RAISE or RAISE_APPLICATION_ERROR instruction should be placed in your "pkg_audit_info.p_load_AM" and "pkg_audit_info.p_load_coa" procedures. This way, you can use a block inside the loop and log the error.
FOR i IN
( SELECT username FROM dba_users WHERE username LIKE 'ABCFIRM%'
LOOP
BEGIN
vstmt:= 'begin ' || i.username || '.pkg_audit_info.p_load_coa; end;';
EXECUTE immediate vstmt;
vstmt:= 'begin ' || i.username || '.pkg_audit_info.p_load_am; end;';
EXECUTE immediate vstmt;
EXCEPTION
WHEN OTHERS THEN
--> Log the error in a custom log table otherwise you will not know what happened for that schema: don't forget the username
END;
END LOOP; -
Using Ref Cursor in procedure in place of normal cursor
Hi,
I have a procedure where i have the follwoing cursors declared,
CURSOR c_wip IS
SELECT tdvalue
FROM tabledetails
WHERE tdidcode = 'PEL_DASHBOARD'
AND tdkey LIKE 'WIP_QUEUES%';
CURSOR c_pending IS
SELECT tdvalue
FROM tabledetails
WHERE tdidcode = 'PEL_DASHBOARD'
AND tdkey LIKE 'PENDING_QUEUES%';
CURSOR c_out IS
SELECT tdvalue
FROM tabledetails
WHERE tdidcode = 'PEL_DASHBOARD'
AND tdkey LIKE 'OUT_QUEUES%';
CURSOR c_out_status IS
SELECT tdvalue
FROM tabledetails
WHERE tdidcode = 'PEL_DASHBOARD'
AND tdkey LIKE 'OUT_STATUS%';
Will the usage of 1 ref cursor instead of the 4 cursors increase the performance.
Thanks.Cursor is a structure which points to a memory locations.
While a Ref-cursor is a datastructure which point to a object which inturn points to Memory locations.
The advantage of having Ref-cursor is that we can pass dynamically the Ref-cursor as a parameter to a procedures.
So it does improve the performance to a small extent. -
Using Ref cursor in Procedure.
Hi All,
Can i use a single ref cursor multple times within the life cycle of a procedure.
Thanks,
DillipYes.
See the example here. A cursor expression is selected - repeatedly, within a loop - into emp_cur (which is of type REF CURSOR) - and emp_cur is then used to process it in a nested loop.
(By the way - this question would be better asked in the PL/SQL).
Regards Nigel -
Passing Ref Cursor as parameter to object type method
I am encountering a problem passing a parameter of type REF CURSOR to methods of a set of object types I am developing.
Here is an example of what I am trying to do:
create or replace package p1 as
type c_Cursor is ref cursor;
end p1;
create or replace type t_Object as object
not instantiable method m1(p_Cursor in p1.c_Cursor) return varchar2
) not instantiable not final;
create or replace type t_Subtype under t_Object as
overriding method m1(p_Cursor in p1.c_Cursor)
return varchar2
The problem is that the PL/SQL compiler gives the error message PLS-00201 "p1.c_Cursor" not defined.
According to my PL/SQL book (SF's Oracle PL/SQL Programming) the only way to use a ref cursor as a parameter to functions/procedures is to wrap them in a package. Indeed I have developed a test procedure in a different package that uses p1.c_Cursor as a parameter and it works fine.
Oracle's documemtation suggests that object security (roles etc) can cause this error but as all the objects are being created in the same schema I don't see how this should be a problem.
If anyone can suggest how to get around this problem I will be very grateful.
BTW, if there are any mistakes in my sample code it's because I am writing it from memory as I don't have Internet access at work.
Thanks,
Charles.Thanks for your reply. I am still baffled as to why it doesn't work but, as you correctly point out, SYS_REFCURSOR works just fine. I figured that out earlier today and now the problem is solved.
Charles. -
Passing Ref Cursor as IN parameter
I have a situation where I have to send whole table into the stored procedure, I read from the oracle new feature for .Net documentation, It is possible to pass an ref cursor as IN parameter to an stored procedure. Please help me in this, it is urgent!
I am using Visual Studio.Net 2003, ODP.Net.Array binding is the best method for large inserts from .NET.
The problem with the associative array is:
-you must write a PL/SQL procedure to actually do the inserts.
-while this will get the data to the PL/SQL engine on the server in a block, it still must cross the into the SQL engine one row at at time.
-Array binding is simpler (you use a normal insert).
-There's a built-in knob to control the batch size.
-The array of row data is copied all the way into the SQL engine together, so it's faster.
Remember, array binding is how the SQL*Loader's conventional-path inserts work.
According to Tom Kyte "you can achive 100's of rows per second into heavily indexed tables that are concurrently being read and updated by other processes."
David -
Ref cursor to object and return to ref cursor
how i will call object type from refcursor and return value to ref cursor .
I need a help. please help me.
takes oracle object types as input/output.
PROCEDURE createserviceorder(
P_serviceorder IN serviceorder,
P_serviceid in out p_sm_type.serviceid,
P_serviceorderid out p_sm_type.serviceorderid,
Returnstatus out callstatus);
The serviceorder, callstatus are oracle object types.
The wrapper procedure for this API would be something like the example with pseudo code below
PROCEDURE createserviceorderwrapper(
P_serviceorder IN REFCURSOR,
P_serviceid in out p_sm_type.serviceid,
P_serviceorderid out p_sm_type.serviceorderid,
Returnstatus out REFCURSOR)
Map from ref cursor P_serviceorder to oracle object for serviceorder;
Map from other data types to local variables;
Call createserviceorder (pass the parameters here and get output .);
Map output callstatus to its equivalent REF CURSOR variable;
Return callstatus (and other out parameters if any )as REF CURSORS;
} -
Ref Cursor over Implicit and explicit cursors
Hi,
In my company when writing PL/SQL procedure, everyone uses "Ref Cursor",
But the article below, says Implicit is best , then Explicit and finally Ref Cursor..
[http://www.oracle-base.com/forums/viewtopic.php?f=2&t=10720]
I am bit confused by this, can any one help me to understand this?
ThanksSeshuGiri wrote:
In my company when writing PL/SQL procedure, everyone uses "Ref Cursor",
But the article below, says Implicit is best , then Explicit and finally Ref Cursor..
[http://www.oracle-base.com/forums/viewtopic.php?f=2&t=10720]
I am bit confused by this, can any one help me to understand this?There is performance and there is performance...
To explain. There is only a single type of cursor in Oracle - that is the cursor that is parsed and compiled by the SQL engine and stored in the database's shared pool. The "+client+" is then given a handle (called a SQL Statement Handle in many APIs) that it can use to reference that cursor in the SQL engine.
The performance of this cursor is not determined by the client. It is determined by the execution plan and how much executing that cursor cost ito server resources.
The client can be Java, Visual Basic, .Net - or a PL/SQL program. This client language (a client of SQL), has its own structures in dealing with that cursor handle received from the SQL engine.
It can hide it from the developer all together - so that he/she does not even see that there is a statement handle. This is what implicit cursors are in PL/SQL.
It can allow the developer to manually define the cursor structure - this is what explicit cursors, ref cursors, and DBMS_SQL cursors are in PL/SQL.
Each of these client cursor structures provides the programmer with a different set of features to deal with SQL cursor. Explicit cursor constructs in PL/SQL do not allow for the use of dynamic SQL. Ref cursors and DBMS_SQL cursors do. Ref cursors do not allow the programmer to determine, at run-time, the structure of the SQL projection of the cursor. DBMS_SQL cursors do.
Only ref cursors can be created in PL/SQL and then be handed over to another client (e.g. Java/VB) for processing. Etc.
So each of the client structures/interfaces provides you with a different feature set for SQL cursors.
Choosing implicit cursors for example does not make the SQL cursor go faster. The SQL engine does not know and does not care, what client construct you are using to deal with the SQL cursor handle it gave you. It does not matter. It does not impact its SQL cursor performance.
But on the client side, it can matter - as your code in dealing with that SQL cursor determines how fast your interaction with that SQL cursor is. How many context switches you make. How effectively you use and re-use the SQL (e.g. hard parsing vs soft parsing vs re-using the same cursor handle). Etc.
Is there any single client cursor construct that is better? No.
That is an ignorant view. The client language provides a toolbox, where each tool has a specific application. The knowledgeable developer will use the right tool for the job. The idiot developer will select one tool and use it as The Hammer to "solve" all the problems.
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