PL/SQL procedure for loop though a table and change values - oracle

Question

Basically I need to make a for loop that will loop though the amount of rows. In each row I need to check a value and change it if it meets the requirements.
I'm new to Oracle, so I just started building it one step at a time and I'm stuck on looping through the table rows. I need to first get the number count of the rows that a Boolean flag set to 0 (false). So then I can loop through only those rows, not every row in the table. Once I'm done with whatever I need to change in that row, set the flag to 1 (true), so when I run the procedure again it won't include that row.
Here's what I have so far:
My table:
CREATE TABLE test_table_results (
name varchar,
account number,
address varchar,
database_search NUMBER(1) DEFAULT 0 NOT NULL
CONSTRAINT searched_in_database CHECK (database_search IN (0,1))
);
The table in my database:
CREATE TABLE test_table_accounts (
name varchar,
account number,
address varchar,
);
Now the procedure will go though the results table and see if the address match, if they do it will copy the account number from the database table into the results account number, then change the flag from 0 to 1, so the next time I search though the table it won't include it because it was already searched.
create or replace PROCEDURE FIND_MATCH_ADDRESS AS
BEGIN
DECLARE
v_cnt NUMBER;
BEGIN
FOR i IN (SELECT rowid, r.* FROM test_table
WHERE database_searched = 0)
LOOP
LOOP
SELECT COUNT(1) INTO v_cnt
FROM test_table
WHERE database_searched = 0;
DBMS_OUTPUT.PUT_LINE(v_cnt);
END LOOP;
END LOOP;
END;
END FIND_MATCH_ADDRESS;
EDIT: Added the two tables in hopes to make my question/task more understandable.
Again thank you for your time!!

Answer 1

In your example I see some mistakes.
In the procedure you do not need Declare. Declaration block is between as and begin
create or replace PROCEDURE proc
AS
-- here variable declaration or local function or procedures
BEGIN
-- here you can write a business logic
END proc;
You can iterate over the records of a table with a For loop. In your example, you also tried to use them. You can iterate over the records of a table with a For loop. In your example, you also tried to use them.
FOR record IN (cursor)
LOOP
{...statements...}
END LOOP;
I did not quite understand why you used another loop in the loop. a loop statement is an endless loop.
loop
...
end loop;
In the loop you can now implement your logic. If you really want to use a loop, then your solution might look like this
create or replace PROCEDURE FIND_MATCH_ADDRESS
AS
v_cnt NUMBER;
BEGIN
FOR rec IN (SELECT r.name
,r.address
,r.account
,a.account as new_account
FROM test_table_results r
join test_table_accounts a on a.address = r.address
WHERE r.database_searched = 0)
LOOP
update test_table_results
set account = rec.new_account
, database_searched = true
where account = rec.account
and name = rec.name
and adress = rec.adress;
END LOOP;
END FIND_MATCH_ADDRESS;
Alternatively, you can also do that with an update. Since I do not know your tables, you should then optimize the where condition.
update test_table_results t
set database_searched = true
, account = (select account
from test_table_accounts a
where a.account = t.account
and a.name = t.name
and a.adress = t.adress)
where database_searched = false
and exists(select 1
from test_table_accounts a
where a.account = t.account
and a.name = t.name
and a.adress = t.adress);