I am trying to build a query to INSERT or UPDATE / DELETE a row depending on some conditions. I was trying to use the MERGE clause but it has some restrictions that doesn't let me change some fields.
Here is the code:
MERGE INTO CADUSUNET t
USING (select 'FELIPE' as nomusunet from cademp where rownum = 1) v --generate the column and the value to compare
ON (t.nomusunet = v.nomusunet)
WHEN MATCHED THEN
UPDATE SET t.nomusunet = 'FELIPE BUENO' --I can't update a column that is referenced in the ON condition clause
WHEN NOT MATCHED THEN
INSERT (nomusunet) VALUES ('FELIPE BUENO')
Is there a way to do that?
You could do this:
begin
update CADUSUNET t
set t.nomusunet = 'FELIPE BUENO'
where t.nomusunet = 'FELIPE';
if sql%rowcount = 0 then
INSERT INTO CADUSUNET (nomusunet) VALUES ('FELIPE BUENO');
end if;
end;
Related
I am trying to write a MariaDB stored procedure.
Due to SQL_SAFE_UPDATES, it is required to use the ID column to use in the WHERE clause for updates. Due to this, what is the normal approach to also select a value from one of the other columns? I do not want to have multiple SELECT statements as it seems inefficient and room for error because they could return values from different rows.
I would like to store my first select statement
SELECT id, sequence FROM RECORDSEQUENCE WHERE SEQTABLE = SeqTable;
In the following two parameters #id, #seq from two seperate columns in the above query and use them in the UPDATE statement as well as the IF statement.
CREATE DEFINER=`sd`#`%` PROCEDURE `SD_GenerateNextRecordSequence`(IN SeqTable int)
BEGIN
SELECT id, sequence FROM RECORDSEQUENCE WHERE SEQTABLE = SeqTable;
IF (#seq IS NOT NULL) THEN
SET #NEXTSEQ := #seq+1;
UPDATE RECORDSEQUENCE SET RECORDSEQUENCE = #NEXTSEQ WHERE id = #id;
ELSE
SET #NEXTSEQ := 100;
INSERT INTO RECORDSEQUENCE (RECORDSEQUENCE,SEQTABLE) VALUES (#NEXTSEQ,SeqTable);
END IF;
SELECT #NEXTSEQ as SEQUENCE;
END
I need to read data row by row and update it based on the matching case.
My code is just reading ORBREFTND and inserting Refund from case , not reading other cases. What am i doing wrong.
DECLARE
v_tot_rows NUMBER (3);
v_eval ISG.SWR_CERT_TXN_MSG_TYPE.DESC_TX%TYPE;
CURSOR pltfm_msg_type_cur
IS
SELECT sctmt.PLTFM_MSG_TYPE_CD
FROM ISG.SWR_CERT_TXN_MSG_TYPE sctmt
JOIN ISG.FEATURE_VALUES ft_val
ON sctmt.SWR_CERT_FETR_VAL_ID = ft_val.FEATURE_VAL
JOIN ISG.FEATURE_CATEGORY ft_cat
ON ft_val.FEATURE_CAT = ft_cat.FEATURE_CAT
WHERE ft_cat.SHORT_DESCRIP = 'PLT'
AND ft_val.FEATURE_VALUE = 'Orbital';
BEGIN
FOR msg_code IN pltfm_msg_type_cur
LOOP
CASE msg_code.PLTFM_MSG_TYPE_CD
WHEN 'WAC'
THEN
v_eval := 'Authorization and Mark for Capture';
WHEN 'ORBAUTHCAP'
THEN
v_eval := 'Authorization Capture';
WHEN 'ORBREFTND'
THEN
v_eval := 'Refund';
END CASE;
UPDATE ISG.SWR_CERT_TXN_MSG_TYPE sctmt
SET sctmt.DESC_TX = v_eval;
END LOOP;
COMMIT;
v_tot_rows := SQL%ROWCOUNT;
/* Implicit Attribute %ROWCOUNT is used to find the number of rows affected by the update command */
DBMS_OUTPUT.PUT_LINE ('Total records updated : ' || v_tot_rows);
END;
You're missing a where-condition:
UPDATE ISG.SWR_CERT_TXN_MSG_TYPE sctmt
SET sctmt.DESC_TX = v_eval
WHERE sctmt.primarykey = msg_code.primarykey; -- This one is missing. Don't know your primary key..
Without the where you'll always set the value of the last cursor-object to all objects in your table ISG.SWR_CERT_TXN_MSG_TYPE.
You also need to select the key from your table:
CURSOR pltfm_msg_type_cur
IS
SELECT sctmt.PLTFM_MSG_TYPE_CD,
sctmt.PRIMARYKEY -- select key here
FROM ISG.SWR_CERT_TXN_MSG_TYPE sctmt
JOIN ISG.FEATURE_VALUES ft_val
ON sctmt.SWR_CERT_FETR_VAL_ID = ft_val.FEATURE_VAL
JOIN ISG.FEATURE_CATEGORY ft_cat
ON ft_val.FEATURE_CAT = ft_cat.FEATURE_CAT
WHERE ft_cat.SHORT_DESCRIP = 'PLT'
AND ft_val.FEATURE_VALUE = 'Orbital';
I need to create select statement in post_insert trigger. Is it possible if yes then how?
I want to check another table records if it exists then it will update it otherwise insert as new record. Please help.
My block code is that i want to run
DECLARE
EXSIST_TYPE varchar2(50);
EXSIST_NAME varchar2(50);
EXSIST_COMPANY VARCHAR2(100);
BEGIN
SELECT PRO_TYPE, PRO_NAME, COMPANY_NAME INTO EXSIST_TYPE, EXSIST_NAME ,EXSIST_COMPANY FROM STOCK;
IF
:PURCHASE_DETAIL.PRO_TYPE <> EXSIST_TYPE AND
:PURCHASE_DETAIL.PRO_NAME <> EXSIST_NAME AND
:PURCHASE_DETAIL.COMPANY_NAME <> EXSIST_COMPANY THEN*/
IF
:PURCHASE.RADIO_TYPE = 'PURCHASE' THEN
INSERT INTO STOCK(
PRO_TYPE ,
PRO_NAME ,
COMPANY_NAME ,
QUANTITY ,
PURCHASE_RATE,
SALE_RATE ,
RACK_NUM
)
VALUES
(
:PURCHASE_DETAIL.PRO_TYPE,
:PURCHASE_DETAIL.PRO_NAME,
:PURCHASE_DETAIL.COMPANY_NAME,
:PURCHASE_DETAIL.QUANTITY,
:PURCHASE_DETAIL.PRICE,
:PURCHASE_DETAIL.SALE_PRICE,
:PURCHASE_DETAIL.RACK_NUM
);
END IF;
ELSIF
:PURCHASE_DETAIL.PRO_TYPE = EXSIST_TYPE AND
:PURCHASE_DETAIL.PRO_NAME = EXSIST_NAME AND
:PURCHASE_DETAIL.COMPANY_NAME = EXSIST_NAME THEN
IF
:PURCHASE.RADIO_TYPE = 'PURCHASE' THEN
UPDATE STOCK SET
STOCK.QUANTITY = STOCK.QUANTITY+:PURCHASE_DETAIL.QUANTITY
WHERE
STOCK.PRO_TYPE = :PURCHASE_DETAIL.PRO_TYPE AND
STOCK.PRO_NAME = :PURCHASE_DETAIL.PRO_NAME AND
STOCK.COMPANY_NAME= :PURCHASE_DETAIL.COMPANY_NAME;
ELSIF
:PURCHASE.RADIO_TYPE = 'PRCH_RETURN' THEN
UPDATE STOCK SET
STOCK.QUANTITY = STOCK.QUANTITY-:PURCHASE_DETAIL.QUANTITY
WHERE
STOCK.PRO_TYPE = :PURCHASE_DETAIL.PRO_TYPE AND
STOCK.PRO_NAME = :PURCHASE_DETAIL.PRO_NAME AND
STOCK.COMPANY_NAME = :PURCHASE_DETAIL.COMPANY_NAME;
END IF;
END IF;
END;
You never said what happened when you ran that code.
Anyway: requirement you mentioned ("if it exists then it will update it otherwise insert") looks like an excellent candidate for a MERGE statement (also called upsert, as a combination of UPdate and inSERT).
As Forms 6i is an old piece of software, I'm pretty much sure that MERGE can't directly be used there. However, if the underlying database is at least 9i, MERGE will work - create a stored procedure that contains MERGE, and pass form items' values as parameters.
Here's an example (taken from here; have a look for more examples. I'm lazy to create my own code):
MERGE INTO employees e
USING hr_records h
ON (e.id = h.emp_id)
WHEN MATCHED THEN
UPDATE SET e.address = h.address
WHEN NOT MATCHED THEN
INSERT (id, address)
VALUES (h.emp_id, h.address);
Im trying to learn PL/SQL and I was given an assignment which I am not sure how to tackle.
I am given a list of orders. I want to check my ORDER table for each of them in the following way:
Check if order exists, if no create a record
Check if order fullfilled (0 or 1)
If order is not fullfilled (0), update to 1
I put together a script which I think can do this for one order, but I'm sure it's not very good:
DECLARE
tmp NUMBER;
tmp2 NUMBER;
o_id NUMBER := 999;
BEGIN
/*Checking if order exists */
SELECT COUNT (*)
INTO tmp
FROM ORDERS
WHERE ORDERID = o_id;
IF ( tmp = 0 ) THEN
/* INSERT HERE */
END IF;
SELECT FULLFILLED INTO tmp2
FROM ORDERS
WHERE ORDERID = o_id;
IF (tmp2 = 0) THEN
/* UPDATE... */
END IF;
end;
I would appreciate any advice, what should I look into to make this script efficient? Thank you.
MERGE statement is what you need. It is based on SELECT statement and let's you UPDATE or INSERT data using it's WHEN (NOT) MATCHED THEN clauses. Here's a good explanation with some examples: Oracle Base MERGE Statement.
Here's also some code snippet you might find useful:
DECLARE
o_id NUMBER := 999;
BEGIN
MERGE INTO ORDERS o
USING
(SELECT o_id AS orderid FROM dual) o_id
ON
(o.orderid = o_id.orderid)
WHEN MATCHED THEN
UPDATE SET
o.fulfilled = CASE WHEN o.fulfilled = 0 THEN 1 ELSE o.fulfilled END
WHEN NOT MATCHED THEN
INSERT (fulfilled, <some_other_columns>)
VALUES (1, <values_for_other_columns>);
END;
/
Please read up on the merge statement: https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_9016.htm
Also called an "upsert". Basically if the row does not exist, insert. If it does, update.
It does what you are trying to do in one statement.
I have the following code which is not executing correctly. I have data stored in date_tmp (varchar) that includes dates and nondates. I want to move the dates in that column to date_run (date) and data that is not a date, will be moved to a comments (varchar) column. When I run the following code, the entire set of data gets moved to comments. It runs fine when I edit out the insert statement and just run the dbms_outputline line. What might I be doing incorrectly?
DECLARE
CURSOR getrow IS
SELECT a.id, a.date_tmp
FROM mycolumn a
WHERE a.id < 1300;
v_date date;
BEGIN
FOR i in getrow LOOP
BEGIN
v_date := to_date(i.date_tmp, 'mm/dd/yy');
INSERT INTO mycolumn a(a.date_run)
VALUES(i.date_tmp);
EXCEPTION
WHEN OTHERS THEN
--dbms_output.put_line(i.date_tmp);
update mycolumn a
SET a.comments = i.date_tmp
where a.id = i.id;
END;
END LOOP;
END;
You try to insert varchar i.date_tmp into a date field. Instead insert v_date.
...
INSERT INTO mycolumn a (a.date_run)
VALUES(v_date);
...
But actually your requirement is a move. That calls for an update actually. So I think what you really want to do is:
...
update mycolumn a
SET a.date_run = v_date
where a.id = i.id
...
And actually you could have a function that checks if you have a valid date or not and then you might be able to handle the whole task using a simple update statement.
create or replace function is_a_date(i_date varchar2, i_pattern varchar2)
return date
is
begin
return to_date(i_date, i_pattern);
exception
when others return null;
end is_a_date;
With that function you could write two update statements
update mycolumn
set date_run = to_date(date_tmp,'dd/mm/yy')
where is_a_date(date_tmp, 'dd/mm/yy') is not null;
update mycolumn
set comment = date_tmp
where is_a_date(date_tmp, 'dd/mm/yy') is null;
I designed the function in a way that you could use it in various ways as it returns you a date or null but no exception if the varchar does not conform to the date pattern.
You have an insert where it looks like you need an update, like you have in the exception handler. So just change it to:
v_date := to_date(i.date_tmp, 'mm/dd/yy');
update mycolumn
set date_run = v_date
where id = i.id;
or you could shorten it to:
update mycolumn
set date_run = to_date(i.date_tmp, 'mm/dd/yy')
where id = i.id;
#hol solution is the best approach for me.
Avoid always you can loops and procedures if you can do it with simple SQL statments, your code will be more faster.
Also, if you have always have a data fixed format , you can ride of the PL/SQL function is_a_date function and do it everything with SQL... but the code gets a little uglier with something like this:
update mycolumn
set date_run = to_date(date_tmp,'dd/mm/yy')
where substr(date_tmp,1,2) between '1' and '31'
and substr(date_tmp,4,2) between '1' and '12'
and substr(date_tmp,7,2) between '00' and '99';
If you need more speed in your query or you have a huge amount of data in date_tmp, as function is_a_date is deterministic (always returns the same value given the same values for X, Y,), you can create an index for it:
create index mycol_idx on mycolumn(is_a_date(date_tmp));
And when you use the function, Oracle will use your index, like in those selects:
SELECT a.id, a.date_tmp
FROM mycolumn a
WHERE a.id < 1300
and is_a_date(a.date_tmp) is not null;
SELECT a.id, a.date_tmp
FROM mycolumn a
WHERE a.id < 1300
and (is_a_date(a.date_tmp) is not null and is_a_date(a.date_tmp)>sysdate-5);