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Re: PG and dynamic statements in stored procedures/triggers? - Mailing list pgsql-general

From Durumdara
Subject Re: PG and dynamic statements in stored procedures/triggers?
Date
Msg-id AANLkTiksAdX6sGx2jnp-YrqUfO=ufQTRWPyQPxYuJuVL@mail.gmail.com
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In response to Re: PG and dynamic statements in stored procedures/triggers?  (Adrian Klaver <adrian.klaver@gmail.com>)
Responses Re: PG and dynamic statements in stored procedures/triggers?  (Adrian Klaver <adrian.klaver@gmail.com>)
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Hi!

Thanks!

How do I create "cursor" or "for select" in PGSQL with dynamic way?

For example

:tbl = GenTempTableName()
insert into :tbl...
insert into :tbl...
insert into :tbl...

for select :part_id from :tbl begin
    exec 'select count(*) from subitems where id = ?' using :part_id into :sumof
    update :tbl set sumof = :sumof where part_id=:part_id
end;

Can you show me same example?

Thanks:
    dd

2011/3/7 Adrian Klaver <adrian.klaver@gmail.com>
On Monday, March 07, 2011 6:32:44 am Durumdara wrote:
> Hi!
>
> In other RDBMS I found a way to make dynamic statements.
> I can use variables, or concat the SQL segments, and execute it all.
>
> :tablename = call CreateTempTable;
>
> insert into :tablename ....
> drop table :tablename
>
> or (FireBird like cursor handling):
>
> sql = "select * from " || :tablename || " where..."
> for select :sql ....
> ...
>
> Can I do same thing in PGSQL too?
>
> Thanks:
>    dd

http://www.postgresql.org/docs/9.0/interactive/plpgsql-statements.html#PLPGSQL-
STATEMENTS-EXECUTING-DYN
--
Adrian Klaver
adrian.klaver@gmail.com

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