Update a column using cursor
Hi everyone,
still playing around with newbie stuff here. Is it possible to update a column or a row using a cursor? I understand how to fetch a data using a cursor, but not sure if it can help to update a data.
If it can, what's the syntax?
Regards,
Valerie
hi,
why you opted to update rows by using cursor.
why not you opt DML
or
just want to know
SQL> SET LINE 32323
SQL> /
Rollback complete.
SQL> SELECT *FROM EMP;
7499 KITTU SALESMAN 7698 20-FEB-81 15800 25050 30
7566 JONES MANAGER 7839 02-APR-81 3175 446.25 20
7654 RAVIKUMAR SALESMAN 7698 28-SEP-81 1450 1587.5 30 [email protected]
7698 BLAKE MANAGER 7839 01-MAY-81 3050 427.5 30
7782 CLARK MANAGER 7839 09-JUN-81 2650 367.5 10
7788 SCOTT ANALYST 7566 09-DEC-82 3200 450 20
7839 KING PRESIDENT 17-NOV-81 5200 8250 10
7844 TURNER SALESMAN 7698 08-SEP-81 1700 225 30
7876 ADAMS CLERK 7788 12-JAN-83 1300 165 20
7900 JAMES CLERK 7698 03-DEC-81 1150 85.5 30 [email protected]
7902 FORD ANALYST 7566 03-DEC-81 3200 450 20
7934 MILLER CLERK 7782 23-JAN-82 1500 195 10
8000 KINGBABA PRESIDENT 17-NOV-81 5200 8250 10
8001 TURNER RAV SALESMAN 8000 08-SEP-81 1700 450 30
14 rows selected.
SQL> DECLARE
2 CURSOR CUR_EMP IS SELECT *FROM EMP;
3 CUR_EMP1 CUR_EMP%ROWTYPE;
4 BEGIN
5 OPEN CUR_EMP;
6 LOOP
7 FETCH CUR_EMP INTO CUR_EMP1;
8 EXIT WHEN CUR_EMP%NOTFOUND;
9 UPDATE EMP SET ENAME='TEST'
10 WHERE ENAME=CUR_EMP1.ENAME;
11 END LOOP;
12 CLOSE CUR_EMP;
13 END;
14 /
PL/SQL procedure successfully completed.
SQL> SELECT *FROM EMP;
7499 TEST SALESMAN 7698 20-FEB-81 15800 25050 30
7566 TEST MANAGER 7839 02-APR-81 3175 446.25 20
7654 TEST SALESMAN 7698 28-SEP-81 1450 1587.5 30 [email protected]
7698 TEST MANAGER 7839 01-MAY-81 3050 427.5 30
7782 TEST MANAGER 7839 09-JUN-81 2650 367.5 10
7788 TEST ANALYST 7566 09-DEC-82 3200 450 20
7839 TEST PRESIDENT 17-NOV-81 5200 8250 10
7844 TEST SALESMAN 7698 08-SEP-81 1700 225 30
7876 TEST CLERK 7788 12-JAN-83 1300 165 20
7900 TEST CLERK 7698 03-DEC-81 1150 85.5 30 [email protected]
7902 TEST ANALYST 7566 03-DEC-81 3200 450 20
7934 TEST CLERK 7782 23-JAN-82 1500 195 10
8000 TEST PRESIDENT 17-NOV-81 5200 8250 10
8001 TEST SALESMAN 8000 08-SEP-81 1700 450 30
14 rows selected.Edited by: user291283 on Sep 1, 2009 10:42 PM
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Mardanthanks dear,
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2 /
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8 /
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2 /
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How to update multiple columns from different tables using cursor.
Hi,
i have two tables test1 and test2. i want to udpate the column(DEPT_DSCR) of both the tables TEST1 and TEST2 using select for update and current of...using cursor.
I have a code written as follows :
DECLARE
v_mydept1 TEST1.DEPT_CD%TYPE;
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UPDATE TEST2 SET DEPT_DSCR = 'PLSQL2' WHERE CURRENT OF C1;
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The above code when run says that it runs successfully. But it does not updates the desired columns[DEPT_DSCR].
It only works when we want to update single or multiple columns of same table...i.e. by providing these columns after "FOR UPDATE OF"
I am not sure what is the exact problem when we want to update multiple columns of different tables.
Can anyone help me on this ?oops my mistake.....typo mistake...it should have been as follows --
UPDATE TEST1 SET DEPT_DSCR = 'PLSQL1' WHERE CURRENT OF C1;
UPDATE TEST2 SET DEPT_DSCR = 'PLSQL2' WHERE CURRENT OF C1;
Now here is the upated PL/SQL code where we are trying to update columns of different tables --
DECLARE
v_mydept1 TEST1.DEPT_CD%TYPE;
v_mydept2 TEST2.DEPT_CD%TYPE;
CURSOR C1 IS SELECT TEST1.DEPT_CD,TEST2.DEPT_CD FROM TEST1,TEST2 WHERE TEST1.DEPT_CD = TEST2.DEPT_CD AND TEST1.DEPT_CD = 'AA' FOR UPDATE OF TEST1.DEPT_DSCR,TEST2.DEPT_DSCR;
BEGIN
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LOOP
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Please let us know why it is not updating by using using CURRENT OF -
I have to migrate data from one table to another where one of the columns is the same in both tables. e.g. ID COLUMN
Is there a way to migrate data such that I can update all rows in the ID column in table 2 with corresponding values from ID column in table 1 using one update statement?
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ID || ID
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Thanks
Edited by: 331991 on Feb 4, 2010 11:04 PMHi,
You can do this by using cursor.
At First you have to save the id mapping relationship in a temp table, for example MAPPING_TABLE.
Then you can do this as follow:
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MAPPING_TABLE MAP
WHERE NEW.ID=MAP.NEW_ID
ORDER BY OLD_ID;
Begin
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UPDATE OLD_TABLE
SET ID=REC.NEW_ID,COL1=REC.COL1, COL2=REC.COL2, ....
WHERE ID=REC.OLD_ID;
END LOOP;
COMMIT;
End; The better way, that you may let a column for control issue.
IF ATTRIBUTE1 is NULL for EACH ROW
Declare
Cursor TO_UPDATE IS
SELECT NEW.ID MEW_ID, NEW.COL1, NEW COL2,...., MAP.OLD_ID
FROM NEW_TABLE NEW,
MAPPING_TABLE MAP
WHERE NEW.ID=MAP.NEW_ID
ORDER BY OLD_ID;
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SET ID=REC.NEW_ID,COL1=REC.COL1, COL2=REC.COL2, ...., ATTRIBUTE1 = REC.OLD_ID
WHERE ID=REC.OLD_ID
AND ATTRIBUTE1 IS NULL;
END LOOP;
COMMIT;
End; Best regards,
Zhxiang
Edited by: zhxiangxie on Feb 5, 2010 12:19 PM -
How to pick max value from a column of a table using cursor and iteration
Hello Everybody
I have a table loan_detail
and a column in it loan_amount
now i want to pick values from this table using cursor and then by using iteration i want to pick max value from it using that cursor
here is my table
LOAN_AMOUNT
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200
300
400
500
5600
700i was able to do it using simple loop concepts but when i was trying to do this by using cursor i was not able to do it .
Regards
PeeyushSQL> SELECT MAX(sal) Highest_Sal,MIN(sal) Lowest_Sal FROM emp;
HIGHEST_SAL LOWEST_SAL
5000 800
SQL> set serverout on
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2 TYPE tmp_tbl IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
3 sal_tbl tmp_tbl;
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5 SELECT sal FROM emp;
6 counter INTEGER := 1;
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12 DBMS_OUTPUT.put_line('Lowest SAL:' || sal_tbl.FIRST);
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15 /
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Highest SAL:5000
PL/SQL procedure successfully completed.
SQL> Even smaller
SQL> DECLARE
2 TYPE tmp_tbl IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
3 sal_tbl tmp_tbl;
4 CURSOR emp_sal IS
5 SELECT sal FROM emp;
6 counter INTEGER := 1;
7 BEGIN
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11 DBMS_OUTPUT.put_line('Lowest SAL:' || sal_tbl.FIRST);
12 DBMS_OUTPUT.put_line('Highest SAL:' || sal_tbl.LAST);
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Lowest SAL:800
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SQL> Edited by: Saubhik on Jan 5, 2011 4:41 PM -
How to fetch columns in cursor using FETCH?
create or replace PROCEDURE newprocedur(outname OUT VARCHAR2,outroll OUT NUMBER) AS
CURSOR c1 IS
select Name,Rollno,Section from emp;
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Edited by: im_asa on Nov 1, 2012 3:58 AMHi,
If you need only two why to fetch three ?
Just doing it by yourself will show you what will happen.
Regards
Yoonas -
How to update data returned using REF CURSOR
Hi all,
I am trying to update updated data in a gridview but the update button seem to do nothing as i retrieve data using REF CURSOR.
Let me describe the architecture of my application first. I'm trying to implement best practice whenever possible. I am following the data access tutorial published in www.asp.net , the only difference is that i have an Oracle (10g) database. So I split my application into three layers, data access, business logic, and presentation layer. I'm also writing all queries in an Oracle package.
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