How to store and retrieve data from temp table - oracle

Question

I am new to PL-SQL. Please can someone help me on wrapping the below.
I need to:
Copy contents of table A and store in global temp table
Do an update on Table A & other tasks
Revert contents of Table A from global temp table
Delete temp table
ANy help is much appreciated.

Answer 1

Here you are:
Sample tables:
SQL> create table test as select * from dept;
Table created.
SQL> create global temporary table gtt_test as
2 select * from test where 1 = 2;
Table created.
SQL> select * from test;
DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
1 Dept 1 NY
2 Dept 2 London
6 rows selected.
SQL> select * from gtt_test;
no rows selected
Anonymous PL/SQL block which does what you asked:
SQL> begin
2 -- copy contents ...
3 insert into gtt_test select * from test;
4
5 -- update A
6 update test set loc = 'blabla';
7 delete from test where deptno = 20;
8
9 -- revert
10 delete from test;
11 insert into test select * from gtt_test;
12
13 -- delete temp
14 delete from gtt_test;
15 end;
16 /
PL/SQL procedure successfully completed.
At the end, no changes whatsoever:
SQL> select * from test;
DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
1 Dept 1 NY
2 Dept 2 London
6 rows selected.
SQL> select * from gtt_test;
no rows selected
SQL>
[EDIT]
Query you posted as a comment isn't correct; dynamic SQL must be enclosed into single quotes, it must not be terminated by a semi-colon while all other statements must. Fixed, it should be
BEGIN
EXECUTE IMMEDIATE 'create table camel_route_temp as '
|| ' select * from acquire.CAMEL_ROUTE_PROCESS';
DBMS_OUTPUT.put_line ('Temp table created');
--update A
UPDATE acquire.camel_route_process
SET acquire = 'DISABLED',
assure = 'DISABLED',
validation = 'DISABLED',
report = 'DISABLED',
notification = 'DISABLED';
COMMIT;
DBMS_OUTPUT.put_line ('Aquire components disabled');
END;
/