Re: check table existence...
| От | Shoaib Mir |
|---|---|
| Тема | Re: check table existence... |
| Дата | |
| Msg-id | bf54be870701150445o6302197ha3d52a2bb92010b5@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: check table existence... (Alban Hertroys <alban@magproductions.nl>) |
| Ответы |
Re: check table existence...
|
| Список | pgsql-general |
Something like this will help you......
=======================
CREATE OR REPLACE FUNCTION public.check_table(varchar, varchar)
RETURNS boolean AS $$
DECLARE
v_cnt integer;
v_tbl boolean;
BEGIN
SELECT count(1) INTO v_cnt FROM pg_tables where tablename = $1 and schemaname = $2;
IF v_cnt > 0 THEN
v_tbl = 'true';
END IF;
IF v_cnt = 0 THEN
v_tbl = 'false';
END IF;
return v_tbl;
END;
$$ LANGUAGE 'plpgsql'
=========================
select check_table('emp', 'public');
-----------------------
Shoaib Mir
EnterpriseDB ( www.enterprisedb.com)
=======================
CREATE OR REPLACE FUNCTION public.check_table(varchar, varchar)
RETURNS boolean AS $$
DECLARE
v_cnt integer;
v_tbl boolean;
BEGIN
SELECT count(1) INTO v_cnt FROM pg_tables where tablename = $1 and schemaname = $2;
IF v_cnt > 0 THEN
v_tbl = 'true';
END IF;
IF v_cnt = 0 THEN
v_tbl = 'false';
END IF;
return v_tbl;
END;
$$ LANGUAGE 'plpgsql'
=========================
select check_table('emp', 'public');
-----------------------
Shoaib Mir
EnterpriseDB ( www.enterprisedb.com)
On 1/15/07, Alban Hertroys <alban@magproductions.nl > wrote:
A. Kretschmer wrote:
> am Mon, dem 15.01.2007, um 13:18:11 +0100 mailte Moritz Bayer folgendes:
>> Dear list,
>>
>> I would like to create a function which gets a tablename and checks if the
>> specific table exists.The return value should be a bool.
>> Now I'm wondering how to do this the best way.
>>
>> Any suggestions?
>
> You can ask pg_tables:
>
> select count(1) from pg_tables where tablename = 'foo' and schemaname = 'public';
>
>
> This ask for a table called 'foo' in the schema 'public'.
If you do (something like) that in pl/pgsql, you could RETURN FOUND
after performing that query.
--
Alban Hertroys
alban@magproductions.nl
magproductions b.v.
T: ++31(0)534346874
F: ++31(0)534346876
M:
I: www.magproductions.nl
A: Postbus 416
7500 AK Enschede
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