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
Tags: Database
Similar Questions
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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.
-
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.
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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 12:15All 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.
-
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 much882839 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.
-
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; -
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 -
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 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 07:38user10393567 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.
-
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.
The SELECT inside the LOOP FOR cursor query took 773 seconds.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;
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
-
cursor for loops with exception handling
Hi all
I use oracle11g I need to write a stored procedure to about 10 select statements with the managements of exceptions for each select statement. I am unable to handle the exception handling.please guys help
Here is the code sample I wrote
CREATE OR REPLACE PROCEDURE TEST_PROC
(P_ID IN VARCHAR2,
P_MOB IN VARCHAR2,
P_OUT_MSG OUT VARCHAR2)
AS
CURSOR CUR_RES AS SELECT NAME, INFO, VER_DETAILS FROM TABLE_NAME WHERE ID = P_ID AND MOBILE_NO IS P_MOB;.
BEGIN
FOR REC IN CUR_RES LOOP
P_OUT_MSG: = 'BKY000. '
END LOOP;
EXCEPTION
WHEN NO_DATA_FOUND THEN
P_OUT_MSG: = 'BKY001. '
END;
OUTPUT DESIREE WHILE RUNNING IN A JAVA APPLICATION IS REQUIRED
IF THE DATA FOUND BKY000 | RESULT OF THE SELECT STATEMENT
IF DATA NOT FOUND BKY001
PLEASE HELP WITH SAMPLE... PLEASE FRIENDS
It's more clear now
create or replace procedure test_proc (p_id in varchar2, )
p_mob in varchar2,
p_out_msg out varchar2,.
p_result on sys_refcursor
) as
v_err_msg varchar2 (300);
row_count number;
no_data_returned exception;
nonunique_column exception;
Start
Open Select p_result *.
WCP
where deptno = to_number (p_id)
and job = p_mob;
Select count (*)
in row_count
WCP
where deptno = to_number (p_id)
and job = p_mob;
If row_count = 0 then
raise no_data_returned;
end if;
Select keep max (count (*)) (dense_rank first order by Count)
in row_count
from (select *)
WCP
Union all - simulating a duplicate line
Select 7839, "ETBIN', 'PRESIDENT', null, trunc (sysdate), 3000, null, 10
of the double
)
where deptno = to_number (p_id)
and job = p_mob
Group by empno
view count (*) > 1;
If row_count > 1 then
raise nonunique_column;
end if;
p_out_msg: = 'BYK0000 ';
exception
When no_data_returned
then p_out_msg: = "BYK001";
When nonunique_column
then p_out_msg: = "BYK002";
while others
then v_err_msg: = ' procedure TEST_PROC: error: ' | SQLCODE. ': ' || substr (SQLERRM, 1, 200);
raise_application_error(-20000,v_err_msg);
end;
declare
R_C sys_refcursor;
E_r emp % rowtype;
E_m VARCHAR2 (255);
DEPTNO number: = 10;
VARCHAR2 (30) employment: = "PRESIDENT";
Start
dbms_output.put_line (' input parameters: deptno = ' | to_char (deptno) |) '; job = ' | Job);
test_proc (to_char (DEPTNO), Job, E_m, R_C);
dbms_output.put_line (' result: ' | e_m);
If e_m = "BYK0000" then
loop
extract r_c in e_r;
When the exit r_c % notfound;
dbms_output.put_line (to_char (E_r.empno) |' |) '|| RPAD(E_r.Ename,10) |' | '|| RPAD(E_r.job,10) |' | '|| TO_CHAR (E_r.SAL, 'fm99990'));
end loop;
end if;
exception
While other then dbms_output.put_line ('exception: ' | sqlcode |) ': ' || substr (SQLERRM, 1, 200));
end;
input parameters: deptno = 10; job = PRESIDENT
result: BYK002
Statement processed.
Concerning
Etbin
-
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 21:57833560 wrote:
Hi allcan someone tell me how to know cursor variable host loop for contains data or not.
example:
Start
for curr_rec in (select * from double)
loopdbms_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 PPublished 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 variableTry 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
-
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
ChaitanyaNo, 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.
-
Hi gurus,
I'm going to the table like this:
TEST
And I wrote a test cursor procedure to retrieve values such as:NO PK VALUE
But, my question is, I have used the simple LOOP in the cursor. Anyone can write the same logic of cursor with all IN LOOP and LOOP FOR it pleaseCREATE OR REPLACE PROCEDURE test_proc_cursor ( p_no OUT test.no%TYPE, p_value OUT test.value%TYPE) AS CURSOR proc_cursor IS SELECT no,value INTO p_no, p_value FROM test; BEGIN OPEN proc_cursor; LOOP FETCH proc_cursor INTO p_no, p_value; EXIT WHEN proc_cursor%NOTFOUND; dbms_output.put_line(p_no||' '|| p_value); END LOOP; CLOSE proc_cursor; END test_proc_cursor;
Thank you
Published by: user10679113 on January 22, 2009 07:53
Published by: user10679113 on January 22, 2009 07:54
Published by: user10679113 on January 22, 2009 07:55Hello
SQL> DECLARE 2 p_no test.no%TYPE; 3 p_value test.value%TYPE; 4 CURSOR proc_cursor IS SELECT no,value FROM test; 5 BEGIN 6 OPEN proc_cursor; 7 FETCH proc_cursor INTO p_no, p_value; 8 WHILE proc_cursor%FOUND LOOP 9 dbms_output.put_line(p_no||' '|| p_value); 10 FETCH proc_cursor INTO p_no, p_value; 11 END LOOP; 12 CLOSE proc_cursor; 13 END; 14 / 1 awe 2 JHKBHNJ 3 548539 PL/SQL procedure successfully completed. SQL> DECLARE 2 CURSOR proc_cursor IS SELECT no,value FROM test; 3 BEGIN 4 FOR cRec IN proc_cursor LOOP 5 dbms_output.put_line(cRec.no||' '|| cRec.value); 6 END LOOP; 7 END; 8 / 1 awe 2 JHKBHNJ 3 548539 PL/SQL procedure successfully completed. SQL> BEGIN 2 FOR cRec IN (SELECT no,value FROM test) LOOP 3 dbms_output.put_line(cRec.no||' '|| cRec.value); 4 END LOOP; 5 END; 6 / 1 awe 2 JHKBHNJ 3 548539 PL/SQL procedure successfully completed.
Kind regards
Dima -
cursor for loop in oracle forms 6i
Hi all
I wrote code in the search button to display the deptno = 10 employees, in TOAD everything worked well, but why he is not working in the form button located? Please suggest? I added below that I get all the records? , I want to only employees related records...
BEGIN
FOR e_cursor IN (SELECT ename FROM emp where deptno = 10) LOOP
dbms_output.put_line (e_cursor.ename);
END LOOP;
-EXECUTE_QUERY;
END;
Thank you
You can change the ownership of a block of data (Database Data Block---> Yes, Type of data source to query---> Table, name of Data Source query---> Emp, where the clause--> deptno = 10). Then you write just EXECUTE_QUERY in your when the button is pressed the trigger.
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