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How to extract table name from variable in PL/SQL

Posted on 2001-07-31
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Last Modified: 2008-03-10
I am attempting to declare a cursor which would get the table name for the FROM clause from a variable. How do I go about doing this? thanks.
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Question by:kitsoon
9 Comments
 
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by:vanmeerendonk
ID: 6337178
which db-version are you using?
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by:jtrifts
ID: 6337236
This is not possible using normal SQL in a PL7SQL block.

To do this sort of thing, you have to use dynamic/DBMS SQL.

You can use dbms sql from V7 onwards I believe...

For an example of this, you can refer to the section on DBMS sql in Feursteins PL/SQL book (the best Pl/SQL reference there is, in my opinion).

Alternatively search throush the PAQs for DBMS SQL (or just DBMS and you should get plenty of examples).

Regards,

JT
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by:RMZ
ID: 6337280
HI
can u give us example for what u need?
---rmz---
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saschek earned 600 total points
ID: 6337450
If you've got 8.1.7, you could use native dynamic sql

e.g.:
create or replace package my_pack
as
TYPE     rc_type is REF CURSOR;
FUNCTION open_cursor (p_query VARCHAR2) return rc_type;
end;
/
create or replace package body my_pack
as
function open_cursor (
   p_query VARCHAR2)
   return rc_type
as
   cur my_pack.rc_type;
begin
   open cur for p_query;
   return cur;
end open_cursor;
end my_pack;
/
declare
   v_cur my_pack.rc_type;
   v_val NUMBER;
begin
   v_cur := my_pack.open_cursor('select 123 from dual');
   fetch v_cur into v_val;
   close v_cur;
   dbms_output.put_line(v_val);
end;
/
-- Sven
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Expert Comment

by:myerpz
ID: 6337887
if you only have oracle 7, then something like this would work :-

-- start of script
create or replace procedure delete_from_table
      (in_table_name varchar2,
       in_pk         varchar2)
is
  c1 integer;
  c2 integer;
begin
   c1 := dbms_sql.open_cursor;
   dbms_sql.parse(c1, 'delete ' || in_table_name || ' where pk = ' || in_pk, dbms_sql.v7);
   c2 := dbms_sql.execute(c1);
   dbms_sql.close_cursor (c1);

exception
   when others then
        dbms_output.put_line(sqlerrm);
        dbms_sql.close_cursor (c1);
end delete_from_table;
/
-- end of script

and then in SQL*Plus :-

execute delete_from_table('table_name','primary key value');



hth

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by:RMZ
ID: 6340312
HI
U CAN DECLARE A CURSSOR TO
DECLARE
CURSOR CUR_TABLE AS
SELECT TNAME FROM TAB WHERE TABTYPE='TABLE';
---RMZ---
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by:Moondancer
ID: 7034697
Please update and finalize this old, open question.  Please:

1) Award points ... if you need Moderator assistance to split points, comment here with details please or advise us in Community Support with a zero point question and this question link.
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Expert Comment

by:DanRollins
ID: 7055625
Recommended disposition:

    Split points between: saschek and myerpz

DanRollins -- EE database cleanup volunteer
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Expert Comment

by:Moondancer
ID: 7057206
Thanks, Dan.

Points have been split, awaiting myerpz comments here:
Points for myerpz -> http://www.experts-exchange.com/jsp/qShow.jsp?qid=20308230

Moondancer - EE Moderator
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