dynamice where the Cursor For loop clause

Hi all

I have a cursor based as logic:

FOR temp IN (SELECT colname FROM WHERE whereconditions mytablename)
loop
.
.
.
end loop;

Is there anyway that I can do the whole dynamic WHERE clause?

My where clause should exist only when a certain condition is met. Please help me.

Thank you
Chaitanya

No, it wouldn't. Performance of:

open temp for 'select clause'
loop
fetch into..
exit when (temp%notfound);
merge logic....
end loop;

would be no different from:

for rec in cur loop
merge logic....
end loop;

SY.

Tags: Database

Similar Questions

When to use the cursor for loop and the cursor (open, fetch, close)
Hello world
I have a small doubt about when to use the cursor for loop and when to use the cursor for loop and the cursor (open, fetch, close).
Well, I'm not the difference between implicit and explicit cursor. So please tell me how I got to know, what to use and when?

Kind regards
BS2012

Published by: BS2012 on January 29, 2013 12:15
All SQLs are analyzed, stored and executed as cursors. Thus, you will always use a cursor.

The problem is that languages, such as PL/SQL, provide different interfaces to interact with the SQL cursor. As the ref, the slider interface, the interface DBMS_SQL slider interface and so on.

Each of these interfaces offers different features. For example, using the interface DBMS_SQL allows binding dynamics and dynamic recovery. The Ref Cursor interface allows your code PL/SQL pass a handle to a reference pointing to the SQL cursor, to an external client. Etc.

The fundamental reason for the use of an explicit cursor interface is mainly that you own and manage bulk made extraction output provided by PL/SQL cursor.

With a cursor FOR , the motor loop of PL/SQL optimize the loop by extracting block a 100 lines both. However, you cannot access this collection in bulk directly inside the loop.

With an explicit cursor interface, you specify the size of the extraction in bulk via the clause LIMIT , and you set the variable of collection to use. This allows you to use the collection directly variable inside the loop.

However, the need to do - code manually in bulk collection - rarely occur in the daily programs in PL/SQL. A line of treatment is both slow and not well fits. And even if your bulk code collects lines, these lines must still be processed one at a time in your code. It is much more efficient and scalable rather write SQL code, and make the engine SQL the line of treatment for you.

The execution of a stored procedure from inside the cursor for loop?
I posted this in the SQL Developer forum, but I tried in SQLPlus and get the same error, so I think it's an encoding issue.
I have a piece of code that I'm trying to write that will only be executed once. The goal: we have three tables relating to the pieces of information. Each table has a column that stores the number of site that belongs to the part. We want to copy the parts of a site to about 130 sites which don't have any info on parts. The number of site is stored in another table. So I created three stored procedures, one for each of the three tables that we, who take 2 inputs: a source and destination site. Procedure names are: ptfile_copy_fac, ptxref_copy_fac and ptvndrs_copy_fac.

The problem I have is that I can run the procedures in a separate worksheet in SQL Developer, but when they are integrated in this cursor for loop, I get the following message from SQL Developer:

ORA-06550: line 23, column 11:
PLS-00103: encountered the symbol "PTFILE_COPY_FAC" during the expected in the following way:
:= . (@ %; immediate)
The symbol ': = ' was replaced by 'PTFILE_COPY_FAC' continue.

He repeated this for each of the three methods. I have attached the code I am trying to run below. He expects an assignment operator, but I have no idea why.

If there is a better way to do this, by all means let me know. I'm a SQL Server guy, I'm not sure how to do what I do using PL\SQL.

/ * Declares the variables source_fac and dest_fac.
The source_fac is the installation that we copy parts.
The dest_fac is the installation we copy parts to.* /

DECLARE
source_fac facility.facility_num%type;
INSTALLATION OF DEST_FAC. TYPE % FACILITY_NUM;

/ * Declare cursor to use loop for.
Slider load number installation and the status of the installation.
Is not installation of 1 or 2, since these will be
the main source of facilities.*.

CURSOR fac_cursor
IS
SELECT
facility_num,
div_state
Of
installation
WHERE
facility_num NOT IN (1,2);
BEGIN
FOR fac_row IN fac_cursor
LOOP

/ * Test for the State of the installation. If a Canadian State, the source_fac value 2.
Otherwise, the value source_fac 1.* installation.

IF fac_row.div_state IN ("AB", "BC", "Mo", "NB", "NL", "NT", "NS", "NAKED", "WE", "PE",
"QC", "SK", "YT")
THEN
source_fac: = 2;
ON THE OTHER
source_fac: = 1;
END IF;

/ * Sets the installation of destination to the facility_num from the cursor * /.

DEST_FAC: = FAC_ROW. FACILITY_NUM;

/ * Execute the three procedures, past of the source and dest AEC variable * /.

run ptfile_copy_fac (source_fac, dest_fac);
run ptxref_copy_fac (source_fac, dest_fac);
run ptvndrs_copy_fac (source_fac, dest_fac);

END LOOP;

END;

Published by: SunDevilKid on March 3, 2010 15:31
Update the comments you make more sense of the code.
EXECUTE is a SQLPlus command, change your code to
```
dest_fac := fac_row.facility_num;
ptfile_copy_fac(source_fac, dest_fac);
ptxref_copy_fac(source_fac, dest_fac);
ptvndrs_copy_fac(source_fac, dest_fac);
END LOOP;
```
Max
http://oracleitalia.WordPress.com

How do I know the cursor for loop host variable contains data or not
Hi all

can someone tell me how to know cursor variable host loop for contains data or not.

example:
Start
for curr_rec in (select * from double)
loop

dbms_output.put_line(curr_rec%ROWCOUNT);

end loop;

end;

The following oracle error message is coming:

ORA-06550: line 5, column 27:
PLS-00324: cursor attribute can only be applied to non slider "CURR_REC."

Please help me.

Thank you and best regards,
Prakash P

Published by: 833560 on April 19, 2011 21:57
833560 wrote:
Hi all

can someone tell me how to know cursor variable host loop for contains data or not.

example:
Start
for curr_rec in (select * from double)
loop

dbms_output.put_line(curr_rec%ROWCOUNT);

end loop;

end;

The following oracle error message is coming:

ORA-06550: line 5, column 27:
PLS-00324: cursor attribute can only be applied to non slider "CURR_REC."

Please help me.

Thank you best regards &,.
Prakash P

Published by: 833560 on April 19, 2011 21:57

You know, in your code curr_rec is not slider.
You cannot use curr_rec % rowcount
If you want to get the number of lines of your loop, then use an additional variable

Try this please
```
declare
 countLoop NUMBER :=0;
begin
  for curr_rec in( select * from dual)
  loop
    countloop := countloop + 1;

  end loop;
  dbms_output.put_line(countloop);
end;
```
or
```
DECLARE
        CURSOR csr_org IS
              SELECT empno, ename FROM   emp;
              num_total_rows NUMBER;
      BEGIN
              FOR idx IN csr_org LOOP
                  dbms_output.put_line(idx.empno||' '||idx.ename);
                  num_total_rows := csr_org%ROWCOUNT;
              END LOOP;
              IF num_total_rows > 0 THEN
                dbms_output.new_line;
                dbms_output.put_line('Total Organizations = '||to_char(num_total_rows));
              END IF;
   END;
 /
```
Published by: Mahir M. Quluzade, April 20, 2011 10:19

CURSOR for loops or an associative array
I just want to know the advantages and disadvantages of the CURSOR for loops. As a general rule, what guys do you prefer: associative array with CURSOR for loops?

If you use the CURSOR for loop, is it not difficult to debug?

PL/SQL Developer, I do not see what values are stored in the CURSOR for loop (in SP master_proc below) as
There are no variables to watch. Not sure if the TOAD can show these values

If I had used an associative array (master_proc2 below), I can see the values stored in the table by clicking on "show Collection"variable in PL/SQL developer.
```
create table emp2 as select * from emp;


create or replace procedure my_proc(p_empno in number)
as
begin
update emp2 set sal=sal+100 where empno=p_empno;
end;
/

--Using CURSOR FOR loop

create or replace procedure master_proc
as
begin
     for rec in (select empno from emp2 where empno>7700)
     loop
          my_proc (rec.empno);
     end loop;
end;
/

-- Using Associative arrays
create or replace procedure master_proc2
as
type v_empno_type is table of number index by pls_integer;
v_empno v_empno_type;

begin
select empno bulk collect into v_empno from emp2 where empno>7700;

for i in 1..v_empno.count
 loop
    my_proc (v_empno(i));
 end loop;
end;
/
```
VitaminD wrote:
Thank you Tubby. If you are faced with a situation where you MUST use a loop. Then you would go to associative arrays rather than CURSOR FOR loops. Right?

Doesn't happen too often, but if/when then I would do as I said in my first post. Use the transformation, the collection table in BULK and FORALLs.

If we use your example posted, I would NOT spend a single table (in a loop mode) value I would be transmitted in the OVERALL picture and treat it with FORALL.

So, I would still use neither of the approaches that you mentioned.

Cursor for loop in PlSql
while I was studying on cursor for loop I found this statement in the web

"A cursor FOR loop implicitly declares its index of the loop as the % ROWTYPE record."

for example an emp table contain more columns empno, ename, sal, hiredate deptno

and take a cursor for loop until

for rec in select empno, sal from emp loop

If the cursor loop for said index of the loop as a % rowtype our cursor statement must include all columns and follow the data type compatabulity.

Here our cursor statement includes only a few columns, if we use % rowtype to select all columns but here we do not have it.

Please can someone explain what is happening in the cursor for loop?
Type % line is not for the table. its for the cursor.

its almost like cursor % rowtype

Select ename, sal from emp will be rowtype of ename and sal... not all the columns EMP

Question about the update of a cursor for loop
Hi, please someone could help with the following:

I have a simple script below:

declare

cursor c1 is select name, salary of employers;

Start

for rec loop c1

dbms_output.put_line ('employee' |) Rec.Name | ' s former salary was £' | Rec.salary);

update of employers set salary = salary * 1.2 where name = rec.name;

dbms_output.put_line ('employee' |) Rec.Name | "new treatment is £' | Rec.salary);

end loop;

end;

This gives me the old value of the salary, but the output for the new salary remains the same, that is to say, it has not increased by 1.2.

Ive tried to run in the 2 loops that works, but does not give me in order I want, IE employers followed old sal nine.

Ive tried to add is committed and various other things, but it makes no difference. I thought that the script above should work. Where I'm going wrong?

Thank you very much
882839 wrote:

I learned (perhaps wrongly) that cursor for loops were good practice. Is it not the case?

Could you mention who told you this?

I'm curious because on a daily basis in almost all the sons of my treatment is slow , the reason for the slow transformation is the loop and all responses point out that you are using a loop ensures that the process is running more slowly as possible.

But despite any response in this community saying loops are the worst practices, every day more people come here apparently having learned exactly the opposite and then wonder why their program runs like a dog three legs with an anchor attached to his tail.

How to optimize the select query executed in a cursor for loop?

Hi friends,

I run the code below and clocked at the same time for each line of code using DBMS_PROFILER.

CREATE OR REPLACE PROCEDURE TEST
AS
   p_file_id              NUMBER                                   := 151;
   v_shipper_ind          ah_item.shipper_ind%TYPE;
   v_sales_reserve_ind    ah_item.special_sales_reserve_ind%TYPE;
   v_location_indicator   ah_item.exe_location_ind%TYPE;

   CURSOR activity_c
   IS
      SELECT *
        FROM ah_activity_internal
       WHERE status_id = 30
         AND file_id = p_file_id;
BEGIN
   DBMS_PROFILER.start_profiler ('TEST');

   FOR rec IN activity_c
   LOOP
      SELECT DISTINCT shipper_ind, special_sales_reserve_ind, exe_location_ind
                 INTO v_shipper_ind, v_sales_reserve_ind, v_location_indicator
                 FROM ah_item --464000 rows in this table
                WHERE item_id_edw IN (
                         SELECT item_id_edw
                           FROM ah_item_xref --700000 rows in this table
                          WHERE item_code_cust = rec.item_code_cust
                            AND facility_num IN (
                                   SELECT facility_code
                                     FROM ah_chain_div_facility --17 rows in this table
                                    WHERE chain_id = ah_internal_data_pkg.get_chain_id (p_file_id)
                                      AND div_id = (SELECT div_id
                                                      FROM ah_div --8 rows in this table 
                                                     WHERE division = rec.division)));
   END LOOP;

   DBMS_PROFILER.stop_profiler;
EXCEPTION
   WHEN NO_DATA_FOUND
   THEN
      NULL;
   WHEN TOO_MANY_ROWS
   THEN
      NULL;
END TEST;

The SELECT inside the LOOP FOR cursor query took 773 seconds.
I tried to use COLLECT in BULK instead of a cursor for loop, but it did not help.
When I took the select query separately and executed with a value of the sample, and then he gave the results in a Flash of a second.

All tables have primary key index.
Any ideas what can be done to make this code more efficient?

Thank you
Raj.

DECLARE
  v_chain_id ah_chain_div_facility.chain_id%TYPE := ah_internal_data_pkg.get_chain_id (p_file_id);

  CURSOR cur_loop IS
  SELECT * -- better off explicitly specifying columns
  FROM ah_activity_internal aai,
  (SELECT DISTINCT aix.item_code_cust, ad.division, ai.shipper_ind, ai.special_sales_reserve_ind, ai.exe_location_ind
     INTO v_shipper_ind, v_sales_reserve_ind, v_location_indicator
     FROM ah_item ai, ah_item_xref aix, ah_chain_div_facility acdf, ah_div ad
    WHERE ai.item_id_edw = aix.item_id_edw
      AND aix.facility_num = acdf.facility_code
      AND acdf.chain_id = v_chain_id
      AND acdf.div_id = ad.div_id) d
  WHERE aai.status_id = 30
    AND aai.file_id = p_file_id
    AND d.item_code_cust = aai.item_code_cust
    AND d.division = aai.division;         

BEGIN
  FOR rec IN cur_loop LOOP
    ... DO your stuff ...
  END LOOP;
END;

Published by: Dave hemming on December 4, 2008 09:17

What is the significance of the CURSOR WITH HOLD clause in a cursor declaration?

What is the significance of the CURSOR WITH HOLD clause in a cursor declaration?

A cursor that has been declared with the clause WITH HOLD, after the word CURSOR remains open after a COMMIT or a ROLLBACK. The following example shows how to use the following clause:
```
     EXEC SQL          DECLARE C1 CURSOR WITH HOLD          FOR SELECT ENAME FROM EMP          WHERE EMPNO BETWEEN 7600 AND 7700      END-EXEC.
```
The cursor must not be declared for the UPDATE. The WITH HOLD clause is used in DB2 to override the default, which is to close all cursors on validation. Pro * COBOL provides this clause in order to facilitate the migration of applications to DB2 to Oracle. When MODE = ANSI, use Oracle DB2 default, but all host variables must be declared in a declare Section.

Reference:

Oracle documentation!
http://docs.Oracle.com/CD/B10501_01/AppDev.920/a96109/pco03dbc.htm

Cursor for loop

Hey Experts,.
Can we consider cursor for loop as an example of cursor name
as
CREATE or REPLACE function TotalIncome (name_in IN varchar2) RETURN varchar2 IS total_val number (6); cursor c1 is SELECT monthly_income FROM Employees WHERE name = name_in; BEGIN total_val: = 0; FOR employee_rec in c1 LOOP total_val: = total_val + employee_rec.monthly_income; END LOOP; RETURN total_val; END; In this example, we have created

SShubhangi wrote:

Can we consider cursor for loop as an example of cursor name

Laughing out loud

Your code example explicitly sets a CURSOR variable in the PL/SQL block. Implied things happening opens, fetch and closing the cursor. But that the cursor is declared (in the DECLARE section), it's an explicit cursor - like the whole code block now has a way explicit to reference this slider.

An approach of implicit cursor would be as follows:
```
begin
  for c in(select col1, col2 from table1) loop
    .. do something..
  end loop;
end;
```
As you can see - there is no declaration of a cursor variable. A reference implementation is created instead and are accessible only within the construction that creates this reference - that is FOR loop in this case. The rest of the BEGIN... END block cannot refer to this cursor.

Do not forget the advice of other posters however. In PL/SQL cursor loops is often the WRONG approach to the treatment of data - as it deals with processing (using the PL/SQL) line and not much treatment faster and scalable set of data using SQL only.

PLSQL cursor for loop - no_data_found exception

Hi all
Please, could you help me. I start to learn PL/SQL, so please be pattient.
the very simple block. Base table emp (for Oracle), he sucks with more then 5000 large salary. I thought that the result would be "aaa", but result is actually empty.
```
declare
  cursor c1 (v_num number) is
    select ename,sal
    from emp
    where sal > v_num;
begin
  for rec in c1(5000) LOOP
    begin
    dbms_output.put_line('Employee: ' || rec.ename || ' has a salary of ' || rec.sal);
  exception
  WHEN NO_DATA_FOUND THEN
    dbms_output.put_line('aaa ');
  end;
  END LOOP ;
end;
/
```
How can I solve this problem?
Thank you much for the help.

With the help of a cursor for loop will never throw an exception no_data_found.

Despite everything, you try to catch all exceptions thrown by dbms_output.

declareing cursor for loop inside another cursor for loop
Hi friends,

Is it possible declareing cursor loop within another cursor for loop for.

Please guide for example?
You can even declare cursor within the cursor loop

declare
cursor c1 is select deptno from the Department;
BEGIN
for cr1 in c1
loop
declare
cursor c2 is select ename from emp where deptno = cr1.deptno;
Start
for cr2 in c2
loop
dbms_output.put_line (CR1. DEPTNO | ' ' || CR2.ename);
end loop;
end;
end loop;
end;

Cursor object and cursor for loop back
I am beginner in Oracle and the serious database of programming in general. Right now I'm studying the sliders. I more or less understand how works when the cursor returns a record, but I can't understand why this does not work when the cursor return object and I use "cursor for loop.

Here's the test code:

CREATE or REPLACE TYPE typ_Test () AS OBJECT
text VARCHAR2 (50)
);

CREATE TABLE t_Test to typ_Test;

INSERT INTO t_Test VALUES (typ_Test('111'));
INSERT INTO t_Test VALUES (typ_Test('222'));

-work, simple loop
DECLARE
CURSOR cur IS SELECT VALUE (o) FROM t_Test o;
typ_Test obj;
BEGIN
Heart OPEN;
LOOP
Fetch cur INTO obj;
OUTPUT WHEN heart % NOTFOUND;
dbms_output.put_line (obj. (Text);
END LOOP;
CLOSE cur;
END;

-doesn't work, cursor for loop
DECLARE
CURSOR cur IS SELECT VALUE (o) FROM t_Test o;
BEGIN
FOR news of obj IN LOOP
dbms_output.put_line (obj. (Text);
END LOOP;
END;

Error report:
ORA-06550: line 5, column 30:
PLS-00302: 'TEXT' element must be declared.
ORA-06550: line 5, column 5:
PL/SQL: Statement ignored
06550 00000 - "line %s, column % s:\n%s".
* Cause: Usually a PL/SQL compilation error.

EDIT:
In fact I found no examples on the net of its use "cursor for loop" with cursor that returns the object. Only when the record is returned...

Published by: user10393567 on February 10, 2009 07:38
user10393567 wrote:
Now, in the 'loop' example for what looks "obj" is a folder, not an object, and 'x' is attribute of this recording... But the cursor must return an object, not a record... What Miss me?

In the FOR loop "obj" is a pointer to the cursor/query, not a subject in its own right. It gives you just a reference in the query.

So with that you are referring to the query, but then you need to refer to the column in the query that you are interested, so why there need a name (in my case I called it 'x'). 'x' is the object, and then you refer to the attribute of this object "text".

In the first request that you simply select the value directly object in a variable, so no matter what it's called in the query values are returned by the position that is the first column in the query goes into the first variable in the INTO clause. Once you have that then the variable itself contains the object, and you can just refer to the attribute within that.

Hope that makes sense.

I did my DPI too big and now I can't get it back to a size better because the button 'ok' or 'apply' is less where the cursor can reach. Help! How can I fix?

I have done the too large font, which made it impossible for me to fix it because the essential buttons are way below where the cursor can reach to change the size of fonts (DPI and resolution).

BOTTOM LINE: My desktop icons are so big that they're overlapping eachother, almost everything else is so great that superimposes itself also on printing. I can't figure out what to do to solve this problem. I know where I'm going to change the size, but because I did everything if great, that my cursor cannot reach the size change button.

Your topic (title) indicates that you can access the IPR window and you can click on scale 96 DPI, but you can't go to apply or OK. Yes?

If this is the case, you don't have to reach the buttons apply or OK.

Simply press the Enter key. It is the same as clicking on apply or OK.

where the requirements for the current download? This used to be posted prominently.

where the requirements for the current download? This used to be posted prominently.

See:
- http://www.Mozilla.org/en-us/Firefox/24.0/system-requirements/
You can find the full version of the latest version of Firefox 24.0 in all languages and for all systems operating here:
- http://www.Mozilla.org/en-us/Firefox/all.html

dynamice where the Cursor For loop clause

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