OCIBindByPos() and dynamic SQL (not known at compile time)
Hi,
How can I use OCIBindByPos() or OCIBindByName() if the datatyp of the bind variable(s) is unknown at compile time (the SQL statement is entered by the user at run time)? Or which functions should I use instead?
Many thanks in advance
Edited by: user13176357 on 17.04.2012 12:43
You could write a single native method (with a defined name like "callNative" below) that accepts the name (string) of the actual native function you want to call, and then locates the function via GetProcAddress and calls it. Argument passing and return values could get tricky if the target native functions aren't guaranteed to all have the same signature, but you could handle that by explicit boxing:
native Object callNative (String name, Object [] args);
-slj-
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Difference between Static SQL Query and Dynamic SQL Query.
Hi,
Please explain the basic difference between static and dynamic sql queries. Please explain with example.Static: http://download.oracle.com/docs/cd/E11882_01/appdev.112/e10472/static.htm
Dynamic: http://download.oracle.com/docs/cd/E11882_01/appdev.112/e10472/dynamic.htm -
Hi Team,
I need to write a SQL to cater the requirements. Below is my requirements:
pagename fieldname fieldvalue account_number consumerID
AFAccountUpdate ArrangementsBroken dfsdff 1234 1234
AFAccountUpdate ArrangementsBroken1 dfsdff 1234 1234
AFAccountUpdate ArrangementsBroken2 dfsdff 1234 1234
AFAccountUpdate ArrangementsBroken2 dfsdff 12345 12345
AFAccountUpdate ArrangementsBroken1 addf 12345 12345
Create table test_pivot_dynamic
pagename varchar(200),
fieldname Varchar(200),
fieldvalue varchar(500),
N9_Router_Account_Number bigint,
TC_Debt_Item_Reference bigint
--Input
insert into test_pivot_dynamic Values('AFAccountUpdate','ArrangementsBroken','addf',1234,1234)
insert into test_pivot_dynamic Values('AFAccountUpdate','ArrangementsBroken1','dfsdff',1234,1234)
insert into test_pivot_dynamic Values('AFAccountUpdate','ArrangementsBroken2','fder',1234,1234)
insert into test_pivot_dynamic Values('AFAccountUpdate','ArrangementsBroken2','dfdfs',12345,12345)
insert into test_pivot_dynamic Values('AFAccountUpdate','ArrangementsBroken1','dfdwe',12345,12345)
insert into test_pivot_dynamic Values('AFAccountUpdate1','Arrangements','addf',1234,1234)
insert into test_pivot_dynamic Values('AFAccountUpdate1','Test1','dfsdff',1234,1234)
--Expected output:
Select 1234,1234,'AFAccountUpdate','ArrangementsBroken','addf','ArrangementsBroken1','dfsdff','ArrangementsBroken2','fder','ArrangementsBroken2','fder'
Select 12345,12345,'AFAccountUpdate','ArrangementsBroken','addf','ArrangementsBroken1','dfdwe','ArrangementsBroken2','dfdfs'
Select 1234,1234,'AFAccountUpdate1','Arrangements','addf','Test1','dfsdff'
so basically we have to pivot and dynamic sql and insert the expected output to a common table which will have all the required fields
Thanks,Ram.
Please don't forget to Marked as Answer if my post solved your problem and use Vote As Helpful if a post was useful. It will helpful to other users.This should give you what you're looking for
SELECT N9_Router_Account_Number,TC_Debt_Item_Reference,PageName,
MAX(CASE WHEN SEQ = 1 THEN fieldname END) AS fieldname1,
MAX(CASE WHEN SEQ = 1 THEN fieldvalue END) AS fieldvalue1,
MAX(CASE WHEN SEQ = 2 THEN fieldname END) AS fieldname2,
MAX(CASE WHEN SEQ = 2 THEN fieldvalue END) AS fieldvalue2,
MAX(CASE WHEN SEQ = 3 THEN fieldname END) AS fieldname3,
MAX(CASE WHEN SEQ = 3 THEN fieldvalue END) AS fieldvalue3,
MAX(CASE WHEN SEQ = 4 THEN fieldname END) AS fieldname4,
MAX(CASE WHEN SEQ = 4 THEN fieldvalue END) AS fieldvalue4
FROM
SELECT *,ROW_NUMBER() OVER (PARTITION BY N9_Router_Account_Number,TC_Debt_Item_Reference,PageName ORDER BY PageName) AS SEQ,*
FROM test_pivot_dynamic
)t
GROUP BY N9_Router_Account_Number,TC_Debt_Item_Reference,PageName
To make it dynamic see
http://www.beyondrelational.com/modules/2/blogs/70/posts/10791/dynamic-crosstab-with-multiple-pivot-columns.aspx
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Performance between SQL Statement and Dynamic SQL
Select emp_id
into id_val
from emp
where emp_id = 100
EXECUTE IMMEDIATE
'Select '|| t_emp_id ||
'from emp '
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into id_valWill there be more impact in performance while using Dynamic SQL?CP wrote:
Will there be more impact in performance while using Dynamic SQL?All SQLs are parsed and executed as SQL cursors.
The 2 SQLs (dynamic and static) results in the exact same SQL cursor. So both methods will use an identical cursor. There are therefore no performance differences ito of how fast that SQL cursor will be.
If an identical SQL cursor is not found (a soft parse), the SQL engine needs to compile the SQL source code supplied, into a SQL cursor (a hard parse).
Hard parsing burns a lot of CPU cycles. Soft parsing burns less CPU cycles and is therefore better. However, no parsing at all is the best.
To explain: if the code creates a cursor (e.g. INSERT INTO tab VALUES( :1, :2, :3 ) for inserting data), it can do it as follows:
while More Data Found loop
parse INSERT cursor
bind variables to INSERT cursor
execute INSERT cursor
close INSERT cursor
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parse INSERT cursor
while More Data Found loop
bind variables to INSERT cursor
execute INSERT cursor
end loop
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With dynamic SQL in PL/SQL, you cannot really follow the optimal approach - unless you use DBMS_SQL (a complex cursor interface). With static SQL, the PL/SQL's optimiser can kick in and it can optimise its access to the cursors your code create and minimise parsing all together.
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Execute immediate and dynamic sql
Dear all;
Just curious....Why do developers still use dynamic sql..and execute immediate, because I always thought dynamic sql were bads and the use of execute immediate as well...
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It depends what you want to do.
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I have a strange issue while using dynamic sql for an apex page. I have a requirement to search a string in the database column which is entered by user on a page item. The search process should search the whole phrase only.
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Advance thanks.
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ORA-01008 with ref cursor and dynamic sql
When I run the follwing procedure:
variable x refcursor
set autoprint on
begin
Crosstab.pivot(p_max_cols => 4,
p_query => 'select job, count(*) cnt, deptno, row_number() over (partition by job order by deptno) rn from scott.emp group by job, deptno',
p_anchor => Crosstab.array('JOB'),
p_pivot => Crosstab.array('DEPTNO', 'CNT'),
p_cursor => :x );
end;I get the following error:
^----------------
Statement Ignored
set autoprint on
begin
adsmgr.Crosstab.pivot(p_max_cols => 4,
p_query => 'select job, count(*) cnt, deptno, row_number() over (partition by
p_anchor => adsmgr.Crosstab.array('JOB'),
p_pivot => adsmgr.Crosstab.array('DEPTNO', 'CNT'),
p_cursor => :x );
end;
ORA-01008: not all variables bound
I am running this on a stored procedure as follows:
create or replace package Crosstab
as
type refcursor is ref cursor;
type array is table of varchar2(30);
procedure pivot( p_max_cols in number default null,
p_max_cols_query in varchar2 default null,
p_query in varchar2,
p_anchor in array,
p_pivot in array,
p_cursor in out refcursor );
end;
create or replace package body Crosstab
as
procedure pivot( p_max_cols in number default null,
p_max_cols_query in varchar2 default null,
p_query in varchar2,
p_anchor in array,
p_pivot in array,
p_cursor in out refcursor )
as
l_max_cols number;
l_query long;
l_cnames array;
begin
-- figure out the number of columns we must support
-- we either KNOW this or we have a query that can tell us
if ( p_max_cols is not null )
then
l_max_cols := p_max_cols;
elsif ( p_max_cols_query is not null )
then
execute immediate p_max_cols_query into l_max_cols;
else
RAISE_APPLICATION_ERROR(-20001, 'Cannot figure out max cols');
end if;
-- Now, construct the query that can answer the question for us...
-- start with the C1, C2, ... CX columns:
l_query := 'select ';
for i in 1 .. p_anchor.count
loop
l_query := l_query || p_anchor(i) || ',';
end loop;
-- Now add in the C{x+1}... CN columns to be pivoted:
-- the format is "max(decode(rn,1,C{X+1},null)) cx+1_1"
for i in 1 .. l_max_cols
loop
for j in 1 .. p_pivot.count
loop
l_query := l_query ||
'max(decode(rn,'||i||','||
p_pivot(j)||',null)) ' ||
p_pivot(j) || '_' || i || ',';
end loop;
end loop;
-- Now just add in the original query
l_query := rtrim(l_query,',')||' from ( '||p_query||') group by ';
-- and then the group by columns...
for i in 1 .. p_anchor.count
loop
l_query := l_query || p_anchor(i) || ',';
end loop;
l_query := rtrim(l_query,',');
-- and return it
execute immediate 'alter session set cursor_sharing=force';
open p_cursor for l_query;
execute immediate 'alter session set cursor_sharing=exact';
end;
end;
/I can see from the error message that it is ignoring the x declaration, I assume it is because it does not recognise the type refcursor from the procedure.
How do I get it to recognise this?
Thank you in advanceThank you for your help
This is the version of Oracle I am running, so this may have something to do with that.
Oracle9i Enterprise Edition Release 9.2.0.8.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.8.0 - Production
I found this on Ask Tom (http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:3027089372477)
Hello, Tom.
I have one bind variable in a dynamic SQL expression.
When I open cursor for this sql, it gets me to ora-01008.
Please consider:
Connected to:
Oracle8i Enterprise Edition Release 8.1.7.4.1 - Production
JServer Release 8.1.7.4.1 - Production
SQL> declare
2 type cur is ref cursor;
3 res cur;
4 begin
5 open res for
6 'select * from (select * from dual where :p = 1) connect by 1 = 1'
7 using 1;
8 end;
9 /
declare
ERROR at line 1:
ORA-01008: not all variables bound
ORA-06512: at line 5
SQL> declare
2 type cur is ref cursor;
3 res cur;
4 begin
5 open res for
6 'select * from (select * from dual where :p = 1) connect by 1 = 1'
7 using 1, 2;
8 end;
9 /
PL/SQL procedure successfully completed.
And if I run the same thing on 10g -- all goes conversely. The first part runs ok, and the second
part reports "ORA-01006: bind variable does not exist" (as it should be, I think). Remember, there
is ONE bind variable in sql, not two. Is it a bug in 8i?
What should we do to avoid this error running the same plsql program code on different Oracle
versions?
P.S. Thank you for your invaluable work on this site.
Followup June 9, 2005 - 6pm US/Eastern:
what is the purpose of this query really?
but it would appear to be a bug in 8i (since it should need but one). You will have to work that
via support. I changed the type to tarray to see if the reserved word was causing a problem.
variable v_refcursor refcursor;
set autoprint on;
begin
crosstab.pivot (p_max_cols => 4,
p_query =>
'SELECT job, COUNT (*) cnt, deptno, ' ||
' ROW_NUMBER () OVER ( ' ||
' PARTITION BY job ' ||
' ORDER BY deptno) rn ' ||
'FROM emp ' ||
'GROUP BY job, deptno',
p_anchor => crosstab.tarray ('JOB'),
p_pivot => crosstab.tarray ('DEPTNO', 'CNT'),
p_cursor => :v_refcursor);
end;
/Was going to use this package as a stored procedure in forms but I not sure it's going to work now. -
Insert into using a select and dynamic sql
Hi,
I've got hopefully easy question. I have a procedure that updates 3 tables with 3 different update statements. The procedure goes through and updates through ranges I pass in. I am hoping to create another table which will pass in those updates as an insert statement and append the data on to the existing data.
I am thinking of using dynamic sql, but I am sure there is an easy way to do it using PL/SQL as well. I have pasted the procedure below, and what I'm thinking would be a good way to do it. Below I have pasted my procedure and the bottom is the insert statement I want to use. I am faily sure I can do it using dynamic SQL, but I am not familiar with the syntax.
CREATE OR REPLACE PROCEDURE ACTIVATE_PHONE_CARDS (min_login in VARCHAR2, max_login in VARCHAR2, vperc in VARCHAR2) IS
BEGIN
UPDATE service_t SET status = 10100
WHERE poid_id0 in
(SELECT poid_id0 FROM service_t
WHERE poid_type='/service/telephony'
AND login >= min_login AND login <= max_login);
DBMS_OUTPUT.put_line( 'Service Status:' || sql%rowcount);
UPDATE account_t SET status = 10100
WHERE poid_id0 IN
(SELECT account_obj_id0 FROM service_t
WHERE poid_type = '/service/telephony'
AND login >= min_login AND login <= max_login);
DBMS_OUTPUT.put_line( 'Account Status:' || sql%rowcount);
UPDATE account_nameinfo_t SET title=Initcap(vperc)
WHERE obj_id0 IN
(SELECT account_obj_id0 FROM service_t
WHERE poid_type='/service/telephony'
AND login >=min_login AND login <= max_login);
DBMS_OUTPUT.put_line('Job Title:' || sql%rowcount);
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where service_t.login between service_t.min_login and service_t.max_login
and ani.for_key=a.pri_key
and s.for_key=a.pri_key;'
END;
Thanks for any advice, and have a good weekend.
GeordieCorrect my if I am wrong but aren't these equal?
UPDATE service_t SET status = 10100
WHERE poid_id0 in
(SELECT poid_id0 FROM service_t
WHERE poid_type='/service/telephony'
AND login >= min_login AND login <= max_login);
(update all the records where there id is in the sub-query that meet the WHERE Clause)
AND
UPDATE service_t SET status = 10100
WHERE poid_type='/service/telephony'
AND login >= min_login AND login <= max_login);
(update all the records that meet the WHERE Clause)
This should equate to the same record set, in which case the second update would be quicker without the sub-query. -
Perfomance review Cursor and dynamic SQL
Hi every one ,
I searcher over internet and oracle forums for what is the best for my case.
I tried to rebuild indexes . I had two methods , Both working fine but I am looking for what is better from performance point of view
1- using Cursor like in the below link .
http://www.think-forward.com/sql/rebuildunusable.htm
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I am writing an application running on Windows NT 4 and using the oracle ODBC driver (8.01.05.00, that inserts many rows at a time (10000+) into an oracle 8i database.
At present, I am using a stored procedure to insert each row into the database. The stored procedure uses dynamic SQL because I can only determine the table and field names at run time.
Due to the large number of records, it tends to take a while to perform all the inserts. I have tried a number of solutions such as using batches of SQL statements (e.g. "INSERT...;INSERT...;INSERT..."), but the oracle ODBC driver only seems act on the first statement in the batch.
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nullHi,
I faced this same situation years ago (Oracle 7.2!) and had the following alternatives.
1) Use a 3rd party tool such as Sagent or CA Info pump (very pricey $$$)
2) Use VisualC++ and OCI to hook into the array insert routines (there are examples of these in the Oracle Home).
3) Use SQL*Loader (the best performance, but no real control of what's happening).
I ended up using (2) and used the Rouge Wave dbtools.h++ library to speed up the development.
These days, I would also suggest you take a look at Perl on NT (www.activestate.com) and the DBlib modules at www.perl.org. I believe they will also do bulk loading.
Your problem is that your program is using Oracle ODBC, when you should be using Oracle OCI for best performance.
null
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