Exporting query results in a csv file with oracle procedures

Question

i need to create a procedure that take as a parameter a query and the result of that query should be exported in a csv file but i can't find a solution, can you help me please?

Answer 1

As you're passing any query to a stored procedure (though, I'd rather suggest a function), you can't know which columns will be involved so that you could "prepare" local variables or something like that. Certainly, what comes in mind is ref cursor that's being returned from the function I previously mentioned.

Here's an example; see if it helps.

Function; par_query is a query you'll pass as function's parameter. It (the function) then returns ref cursor.

SQL> create or replace function f_test (par_query in varchar2)
  2    return sys_refcursor
  3  is
  4    rc sys_refcursor;
  5  begin
  6    open rc for par_query;
  7    return rc;
  8  end;
  9  /

Function created.

Let's test it:

SQL> var l_rc refcursor
SQL> begin
  2    :l_rc := f_test('select d.dname, e.ename, e.job, e.sal from emp e join dept d ' ||
  3                    'on e.deptno = d.deptno where d.deptno = 10 '                   ||
  4                    'order by d.deptno, e.ename');
  5  end;
  6  /

PL/SQL procedure successfully completed.

l_rc now contains result of the query that was passed to the function. Let's store it into the file. How? Spool, File will be stored on your own PC (therefore. you don't have to have access to the database server).

SQL> spool test.txt
SQL> print l_rc

DNAME          ENAME      JOB              SAL
-------------- ---------- --------- ----------
ACCOUNTING     CLARK      MANAGER         2450
ACCOUNTING     KING       PRESIDENT       5000
ACCOUNTING     MILLER     CLERK           1300

SQL> spool off

That's it. What's the file contents?

SQL> $type test.txt
SQL> print l_rc

DNAME          ENAME      JOB              SAL
-------------- ---------- --------- ----------
ACCOUNTING     CLARK      MANAGER         2450
ACCOUNTING     KING       PRESIDENT       5000
ACCOUNTING     MILLER     CLERK           1300

SQL> spool off

Kind of works . Make it pretty if you want.