Delcare Cursor using Dynamic SQL using PL/SQL in Oracle 7.3.4
In Oracle 7.3.4, can I declare a cursor at run time using Dynamic SQL. From the sample code in this website, it seems that Oracle 8 support this function. Please help. Thanks a lot.
If I can do this on Oracle 7.3.4, could you give me some sample codes? Thanks.
Regards,
Raymond
Hi,
Try using the the following code where you can dynamically build the Valid Select stmt. and call that where ever you want.
declare
Type Cur_ref Is Ref Cursor;
C_ref Cur_ref;
V_Str Varchar2(100);
V_Name Varchar2(100);
Begin
V_Str := 'Select Ename from Scott.emp Where empno = 7369';
Open C_Ref for V_Str;
Fetch C_ref Into V_Name;
close C_Ref;
dbms_output.put_line(V_Name);
End;
regards
gaurav
null
Similar Messages
-
Report using ref cursor or dynamic Sql
Hi,
I never create a report using a ref cursor or a dynamic sql. Could any one help me to solve the below issue.
I have 2 tables.
1. Student_Record
2. Student_csv_help
Student_Record the main table where the data is stored.
Student_csv_help will contain the all the column names of the Student_record.
CREATE TABLE Student_CSV_HELP
ENTRY_ID NUMBER,
RAW_NAME VARCHAR2(40 BYTE),
DESC_NAME VARCHAR2(1000 BYTE),
IN_OUTPUT_LIST VARCHAR2(1 BYTE)
SET DEFINE OFF;
Insert into TOA_CSV_HELP
(ENTRY_ID, RAW_NAME, DESC_NAME, IN_OUTPUT_LIST)
Values
(1, 'S_ID', 'Student ID', 'Y');
Insert into TOA_CSV_HELP
(ENTRY_ID, RAW_NAME, DESC_NAME, IN_OUTPUT_LIST)
Values
(2, 'S_Name', 'Student Name', 'Y');
Insert into TOA_CSV_HELP
(ENTRY_ID, RAW_NAME, DESC_NAME, IN_OUTPUT_LIST)
Values
(3, 'S_Join_date', 'Joining Date', 'Y');
Insert into TOA_CSV_HELP
(ENTRY_ID, RAW_NAME, DESC_NAME, IN_OUTPUT_LIST)
Values
(4, 'S_Address', 'Address', 'Y');
Insert into TOA_CSV_HELP
(ENTRY_ID, RAW_NAME, DESC_NAME, IN_OUTPUT_LIST)
Values
(5, 'S_Fee', 'Tution Fee', 'N');
commit;
CREATE TABLE Student_record
S_ID NUMBER,
S_Name VARCHAR2(100 BYTE),
S_Join_date date,
S_Address VARCHAR2(360 BYTE),
S_Fee Number
Insert into Student_record
(S_ID, S_Name, S_Join_date, S_Address,S_Fee)
Values
(101, 'john', TO_DATE('12/17/2009 08:00:00', 'MM/DD/YYYY HH24:MI:SS'), 'CA-94777', 2000);
Insert into Student_record
(S_ID, S_Name, S_Join_date, S_Address,S_Fee)
Values
(102, 'arif', TO_DATE('12/18/2009 08:00:00', 'MM/DD/YYYY HH24:MI:SS'), 'CA-94444', 3000);
Insert into Student_record
(S_ID, S_Name, S_Join_date, S_Address,S_Fee)
Values
(103, 'raj', TO_DATE('12/19/2009 08:00:00', 'MM/DD/YYYY HH24:MI:SS'), 'CA-94555', 2500);
Insert into Student_record
(S_ID, S_Name, S_Join_date, S_Address,S_Fee)
Values
(104, 'singh', TO_DATE('12/20/2009 08:00:00', 'MM/DD/YYYY HH24:MI:SS'), 'CA-94666', 2000);
Commit;
Now my requirement is:
I have a form with Student_record data block. When i Click on print Button on this form. It will open another window which has Student_CSV_HELP.DESC_NAME and a check box before this.
The window look like as below:
check_box DESC_NAME+
X S_ID+
-- S_Name+
X S_Join_date+
X S_Address+
-- S_Fee+
X means check box checked.+
-- means check box Unchecked.+
After i selected these check boxes i will send 2 parameters to the report server
1. a string parameter to the report server which has the value 'S_ID,S_Join_date,S_Address' (p_column_name := 'S_ID,S_Join_date,S_Address');
2. the s_id value from the student_record block (p_S_id := '101');
Now my requirement is when i click on run. I need a report like as below:
Student ID : 101+
Joining Date : 12/17/2009 08:00:00+
Address : CA-94777+
This is nothing but the ref cursor should run like as below:
Select S_id from student_record block S_id = :p_S_id;
Select S_Join_date from student_record block S_id = :p_S_id;
Select S_Address from student_record block S_id = :p_S_id;
So, according to my understanding i have to select the columns at the run time. I dont have much knowledge in creating reports using ref cursor or dynamic sql.
So please help me to solve this issue.
Thanks in advance.Plain sql should satisfy your need. Try ....
Select S_id, S_Join_date, S_Address
from student_record
where S_id = :p_S_id -
Can we use Dynamic SQL in Oracle Reports ?
Hi ,
Can we use Dynamic SQL in Oracle Reports ?
If yes please give some examples .
Thanx
sriniI believe the built-in package SRW.Do_Sql is what you are looking for
Example from the document:
/* Suppose you want to create a "table of contents" by getting the
** first character of a columns value, and page number on which its
** field fires to print. Assume that you want to put the "table of
contents"
** into a table named SHIP. You could write the following construct:
DECLARE
PAGE_NO NUMBER;
PAGE_FOR INDEX NUMBER;
SORT_CHAR CHAR(1);
CMD_LINE CHAR(200);
BEGIN
SORT_CHAR := :SORT_NAME ;
IF :CALLED = Y THEN
SRW.GET_PAGE_NUM(PAGE_FOR_INDEX);
SRW.USER_EXIT(RWECOP PAGE_FOR_INDEX
P_START_PAGENO);
SRW.MESSAGE(2,TO_CHAR(:P_START_PAGENO));
END IF;
SRW.GET_PAGE_NUM(PAGE_NO);
CMD_LINE := INSERT INTO SHIP VALUES
(||SORT_CHAR||,||TO_CHAR(PAGE_NO)||);
SRW.MESSAGE(2,CMD_LINE);
SRW.DO_SQL(CMD_LINE);
COMMIT;
EXCEPTION
WHEN DUP_VAL_ON_INDEX THEN
NULL;
WHEN SRW.DO_SQL_FAILURE THEN
SRW.MESSAGE(1,FAILED TO INSERT ROW INTO SHIP TABLE);
WHEN OTHERS THEN
COMMIT;
END; -
How can I open a cursor for dynamic sql statement
Hi,
I'm facing issues opening a cursor for dynamic sql statement : PLS-00455: cursor 'RESULT1' cannot be used in dynamic SQL OPEN statement.
CREATE OR REPLACE FUNCTION DEMO
(MN_I in VARCHAR)
return AB_OWNER.ABC_Type.NonCurTyp is
RESULT1 AB_OWNER.ABC_Type.NonCurTyp;
sql_stmt VARCHAR2(4000);
BEGIN
sql_stmt := 'SELECT * FROM AB_OWNER.DUN WHERE JZ_I in ('||mn_i||') ORDER BY app.ACC_I';
OPEN RESULT1 FOR sql_stmt;
END IF;
return RESULT1;
END DEMO;
What changes should I make in the code so that it doesn't fail? I can't change the definition of RESULT1 cursor though.Gangadhar Reddy wrote:
I used SYS REFCURSOR and was able to implement successfully.How many times did you run this successful implementation that does not use bind variables?
Because this is what will happen when it runs a lot.
http://download.oracle.com/docs/cd/E11882_01/server.112/e17766/e2100.htm#sthref1874
http://forums.oracle.com/forums/search.jspa?q=%2BORA-04031%20%2Bbind&objID=c84&dateRange=all&rankBy=10001&start=30
And you will have to regularly restart the server, or possibly slightly less invasive, flush the shared pool.
Flushing Shared Pool regularly
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1516005546092
>
Ok, this is an easy one to diagnose.
You are not using bind variables. This is terrible. Flushing the shared pool is a bad
solution -- you are literally killing the performance on your box by not using them.
If I was to write a book on how to build non scalable applications in Oracle, this
would be the first and last chapter. This is a major cause of performance issues and a
major inhibitor of scalability in Oracle. The way the Oracle shared pool (a very
important shared memory data structure) operates is predicated on developers using bind
variables. If you want to make Oracle run slowly, even grind to a total halt just
refuse to use them.
>
But, please feel free to go ahead with this successful implementation.
I just hope anyone else who reads this doesn't make the same mistake. -
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. -
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
2- Using Dynamic SQL , which generated script file then run it.
spool rebuildall.sql
select ' alter index '|| owner||'.'||index_name ||' rebuild online; '
from dba_indexes where status='UNUSABLE';
spool off;
@rebuildall.sql
Thanks in advance . Your help is appreciated.Hi ,
Thanks for your input . We had some customer which they have a lot of row chaining and migration , I need to increase PCTFREE
with move command . As result of this command indexes becomes unusable as you know . So there are monthly tables become chained with wrong definitions in PCTFREE and INTRSAN.
I used the above script as help my time and solve problem faster ,It is only when I need it ,So it is not scheduled or something like that .
I'm looking for anything will help and simplify the work . -
I want to be able to use a fuction that will dynamically create a SQL statement and then open a cursor based on that SQL statement and return a ref to that cursor. To achieve that, I am trying to build the sql statement in a varchar2 variable and using that variable to open the ref cursor as in,
open l_stmt for refcurType;
where refcurType is a strong ref cursor. I am unable to do so because I get an error indication that I can not use strong ref cursor type. But, if I can not use a strong ref cursor, I will not be able to use it to build the report based on the ref cursor because Reports 9i requires strong ref cursors to be used. Does that mean I can not use dynamic sql with Reports 9i ref cursors? Else, how I can do that? Any documentation available?Philipp,
Thank you for your reply. My requirement is that, sometimes I need to construct a whole query based on some input, and sometimes not. But the output record set would be same and the layout would be more or less same. I thought ref cursor would be ideal. Ofcourse, I could do this without dynamic SQL by writing the SQL multiple times if needed. But, I think dynamic SQL is a proper candidate for this case. Your suggestion to use lexical variable is indeed a good alternative. In effect, if needed, I could generate an entire SQL statement and place in some place holder (like &stmt) and use it as a static SQL query in my data model. In that case, why would one ever need ref cursor in reports? Is one more efficient over the other? My guess is, in the lexical variable case, part of the processing (like parsing) is done on the app server while in a function based ref cursor, the entire process takes place in the DB server and there is probably a better chance for re-use(?)
Thanks,
Murali. -
Hi..
I'm using a ref cursor query to fetch data for a report and works just fine. However i need to use dynamic sql in the query because the columns used in the where condition and for some calculations may change dynamically according to user input from the form that launches the report..
Ideally the query should look like this:
select
a,b,c
from table
where :x = something
and :y = something
and (abs(:x/:y........)
The user should be able to switch between :x and :y
Is there a way to embed dynamic sql in a ref cursor query in Reports 6i?
Reports 6i
Forms 6i
Windows 2000 PROHello Nicola,
You can parameterize your ref cursor by putting the query's select statement in a procedure/function (defined in your report, or in the database), and populating it based on arguments accepted by the procedure.
For example, the following procedure accepts a strongly typed ref cursor and populates it with emp table data based on the value of the 'mydept' input parameter:
Procedure emp_refcursor(emp_data IN OUT emp_rc, mydept number) as
Begin
-- Open emp_data for select all columns from emp where deptno = mydept;
Open emp_data for select * from emp where deptno = mydept;
End;
This procedure/function can then be called from the ref cursor query program unit defined in your report's data model, to return the filled ref cursor to Reports.
Thanks,
The Oracle Reports Team. -
Hi
I am using oracle 8.1.7 on solaris.
I have created
SQL> CREATE OR REPLACE PACKAGE TEST_PKG AS
2 TYPE row_cursor IS REF CURSOR RETURN TEMP_TAB%ROWTYPE;
3 PROCEDURE Return_Columns_proc (c_return IN OUT row_cursor);
4 END TEST_PKG;
5 /
Package created.
now i am trying to create the procedure Return_Columns_proc by
CREATE OR REPLACE PACKAGE BODY TEST_PKG AS
PROCEDURE Return_Columns_proc (c_return IN OUT row_cursor) AS
QUERY_STR VARCHAR2(850);
x number ;
BEGIN
x:=1;
QUERY_STR :='SELECT * FROM temp_tab where order_line_id = '||x;
OPEN c_return FOR QUERY_STR;
END Return_Columns_proc;
END TEST_PKG;
I am getting following error.
SQL> show error
Errors for PACKAGE BODY TEST_PKG:
LINE/COL ERROR
8/4 PL/SQL: Statement ignored
8/9 PLS-00455: cursor 'C_RETURN' cannot be used in dynamic SQL OPEN
statement
any help for this error.The error says it all. You have defined a strong ref cursor and it cannot be used with dynamic sql. However, that does not mean you cannot use the query directly in the OPEN clause
OPEN c_Return FOR SELECT * FROM temp_tab where order_line_id = X ; -
Dynamic SQL and Oracle stored procedures
Does anybody has any experience with invoking an Oracle stored procedures
with output parameters, using dynamic SQL from Forte?
Thanks,
DimitarI would be interested. We are currently using a homegrown DataMapper architecture with the Microsoft OracleClient. I would like to move to ODP.Net once a production version supporting ADO.Net 2.0 is available. After that, I would then like to look at using an off the shelf persistence framework such as EntitySpaces, NHibernate or IdeaBlade's DevForce.
-
How to write a dynamic SQL in Oracle Portal
Hello
I am running portal on instance C.
I have instance A and B
From instance C I want to run a report where I will select the instance name.
then the when I execute the query must be dynamically generated adn executed.
for example: in the case of instance A;
the query must be
select * from scott.emp@A
in the case of instance B
the query must be
select * from scott.emp@B
I already have database links A and B pointing to instances A and B respectively.
How do I achieve this. Any code samples, suggestions appreciated.
Thanks
GaneshHallo,
I don't understand why you need a database link, if you are already on that instance ?
BUT for your solution : put your database links in a view and select from this view.
In the view you can do something like this :
create or replace view test
(col1, col2, col3)
as
select .., 'A' location
from taba@A
where ...
union
select .., 'C' location
from taba@C
where ...
union
select .., 'B' location
from taba@B
where ...
The only thing you have to do is to give the instance name to the view as the column location.
Good luck.
Filip Huysmans. -
PLS-00455: cursor 'CUR_1' cannot be used in dynamic SQL OPEN statement
create or replace function f_my_test_func
return refcur_pkg.refcur_t1
is
cur_1 refcur_pkg.refcur_t1;
begin
open cur_1
for
'select * from dept';
return cur_1;
exception
when others
then
insert into ddl_log (SQLTEXT)
values
('fucntion error');
end;I would suggest that cur_1 refcur_pkg.refcur_t1 is a stongly typed ref cursor i.e. it has RETURN dept%ROWTYPE or something similar in the declaration. You can't use strongly typed ref cursors with dynamic SQL in this way. The declaration should be weakly typed or just use sys_refcursor.
DTYLER_APP@pssdev2> DECLARE
2
3 TYPE t_Strong IS REF CURSOR RETURN dual%ROWTYPE;
4
5 lc_Strong t_Strong;
6
7 BEGIN
8
9 OPEN lc_Strong FOR
10 'SELECT * FROM dual';
11
12 END;
13 /
OPEN lc_Strong FOR
ERROR at line 9:
ORA-06550: line 9, column 10:
PLS-00455: cursor 'LC_STRONG' cannot be used in dynamic SQL OPEN statement
ORA-06550: line 9, column 5:
PL/SQL: Statement ignored
DTYLER_APP@pssdev2>
DTYLER_APP@pssdev2> DECLARE
2
3 TYPE t_Weak IS REF CURSOR;
4
5 lc_Weak t_Weak;
6
7 BEGIN
8
9 OPEN lc_Weak FOR
10 'SELECT * FROM dual';
11
12 END;
13 /
PL/SQL procedure successfully completed.
DTYLER_APP@pssdev2> DECLARE
2
3 lc_Weak sys_refcursor;
4
5 BEGIN
6
7 OPEN lc_Weak FOR
8 'SELECT * FROM dual';
9
10 END;
11 /
PL/SQL procedure successfully completed.
DTYLER_APP@pssdev2>HTH
David -
Dynamic SQL using DBMS_SQL Package
Hi,
How do i construct a
"select * from :table_name(input parameter)"
in a store proc in Oracle8 ?
I know this is only possible using DBMS_SQL package in Oracle 8.
I know that this is easily done using native Dyanamic SQL 8i onwards.
Also I want to return the resultset obtained above through a REF cursor.
Please Help !!!
Will be greatly indebted to anyone who can supply the code or direct me to some helpful information on the net.
Thanks in advance.
PeeyushYou are asking for two things here, use the tablename dynamically
as bind variable to fetch the resultset and send the resultset to
a stored procedure.
I thought of doing both of them with REF Cursors, no Dynamic SQL here.
Consider the following test,SQL> create or replace package ref_types as
2 type r_cursor(pSal NUMBER) is ref cursor;
3 end;
4 /
Package created.
-- Please note that I did some quick and dirty coding to switch
-- between the table names to show the results.
SQL> create or replace procedure p_dynamic_table
2 (pRefCur IN ref_types.r_cursor, pTable varchar2) as
3 emp_rec my_emp%ROWTYPE;
4 inv_rec test444%ROWTYPE;
5 begin
6 loop
7 IF UPPER(pTable) = 'MY_EMP' Then
8 fetch pRefcur into emp_rec;
9 Elsif UPPER(pTable) = 'INV' THEN
10 fetch pRefCur into inv_rec;
11 Else
12 exit;
13 End if;
14 exit when pRefcur%NOTFOUND;
15 If UPPER(pTable) = 'MY_EMP' Then
16 dbms_output.put_line(emp_rec.empno);
17 Elsif UPPER(pTable) = 'INV' Then
18 dbms_output.put_line(inv_rec.seq);
19 Else
20 Null;
21 End if;
22 end loop;
23 end;
24 /
Procedure created.
SQL> declare
2 vRefCur ref_types.r_cursor;
3 vTableName Varchar2(30);
4 begin
5 vTableName := 'my_emp';
6 open vRefCur for 'select * from ' || vTableName;
7 p_dynamic_table(vRefCur, vTableName);
8 close vRefCur;
9 vTableName := 'inv';
10 open vRefCur for 'select * from ' || vTableName;
11 p_dynamic_table(vRefCur, vTableName);
12 close vRefCur;
13 end;
14 /
7369
7499
7521
7566
7654
7698
7782
7788
7839
7844
7876
7900
7902
7934
1
2
3
4
5
6
7
8
9
10
PL/SQL procedure successfully completed.Thx,
Sri -
Cursor using variable table name
I'm new to Oracle, and am wondering if I can create a cursor that can take a variable name as the table it's selecting from. I am working on an application that is loading data to 1 of 3 tables. The table name is stored as a variable and the loads are done using dymanic sql to constuct the insert statement. At the end, I want to select and process some specific info from the table that's been loaded by cycling thru a cursor on whichever of the 3 tables was populated. I could create 3 cursors, one for each table, test the table_name variable, and then reference the specific cursor that way, but I thought there must be another way to do this. I want to be able to do something like this:
CURSOR loaded_table is select distinct(process_key) from 'v_tablename' (where v_tablename is either TABLE2, TABLE2 or TABLE3)
Any suggestions would be greatly appreciated.
Tks...MCRIt's possible to use dynamic SQL for something like this. If we're only talking about three tables, though, my hunch is that you'll be much happier defining three different cursors. Dynamic SQL is significantly harder to write, debug, and maintain than static SQL, so you're better off resorting to it only when there are so many tables that static SQL is impractical.
Justin
Distributed Database Consulting, Inc.
www.ddbcinc.com/askDDBC -
Improving Performance of Dynamic SQL in Pro*C
I am using Dynamic sql format 3 in pro*C,
i.e prepare sqlstmt from :sql_stmt
declare cursor c1 for sqlstmt
But the query is slow .I am also using
order by with ltrim(rtrim(colname))
& sometimes group by .
can anyone tell how to improve performance
of cursors in dynamic sql,or how can
I use the same in Pl/sql with simultaneous
printing of the rows returned,on a file.
nullManoj,
Typically, the slow performance is due to the SQL statement itself rather than the dynamic SQL execution code in Pro*C.
Check your explain plan to see if the query performs well. I suspect that you will find your problem here.
Maybe you are looking for
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