Define, initialise and use variables in SQL developer and SSIS ODBC connection - sql

Question

I am working on a script to be later used in my SSIS ETL, the source DB is oracle and I am using SQL Developer 20.0.2.75 .
I spent so much time declaring 100 variables but it doesn't see to work in SQL developer.
Define & Initialise:
Declare
V1 number;
V2 number;
.
.
.
V100 number;
Begin
Select UDF(params1,param2) into V1 from dual;
Select UDF(params3,param4) into V2 from dual;
...
End;
I was hoping I'd be able to use these variables in my script like :
select columns from table where Col1=:V1 and Col2=:V2
When used "Run Statement" prompts for values, "Run Script" doesn't see to like into Variable statements.
I even tried :
select columns from table where Col1=&&V1 and Col2=&&V2
Now my query doesn't work !
After below responses, I changed my script to :
Variable V1 Number;
Variable V2 Number;
exec select MyFunction(p1,p2) into :V1 from Dual;
/
Select columns from table where col1=:V1 and col2=:V2
It still prompts for value
This is how I defined my function
Create Function MyFunction(m IN Varchar, s IN Number)
Return Number
IS c Number;
select code into c from table where col1=m and col2=s;
Return(c);
End;
Is there anything wrong with the function?

Answer 1

You define variables as per you would in SQL Plus or SQLcl and then run it as a script
Text below
variable x1 number
begin
select 123 into :x1 from dual;
end;
/
print x1
Similar example in SQL Plus (and will work in SQL Dev as well)
SQL> set serverout on
SQL> variable x1 number
SQL> begin
2 select 5 into :x1 from dual;
3 end;
4 /
PL/SQL procedure successfully completed.
SQL> print x1
X1
----------
5
SQL>
SQL> select rownum from dual
2 connect by level <= :x1;
ROWNUM
----------
1
2
3
4
5
SQL>
SQL> begin
2 dbms_output.put_line('X1 is '||:x1);
3 end;
4 /
X1 is 5
PL/SQL procedure successfully completed.

Answer 2

I spent so much time declaring 100 variables
To me, it looks like a wrong approach. OK, declare a few variables, but 100 of them?! Why wouldn't you switch to something easier to maintain. What? A table, for example.
create table params
(var varchar2(20),
value varchar2(20)
);
Pre-populate it with all variables you use (and then just update their values), or just insert rows:
insert into params (var, value) values ('v1', UDF(params1, param2));
insert into params (var, value) values ('v2', UDF(params3, param4));
...
Fetch values through a function:
create or replace function f_params (par_var in varchar2)
return varchar2
is
retval varchar2(20);
begin
select value
into retval
from params
where var = par_var;
return retval;
end;
Use it (in your query) as:
select columns
from table
where Col1 = f_params('v1')
and Col2 = f_params('v2')
If many users use it, consider creating one "master" params table (which contains all the variables) and a global temporary table (which would be populated and used by each of those users).