Обсуждение: lock row in table

 

Of course I can lock record with syntax

"Begin;

        select * from table1 where ID=12 for update; 

        update table1 set field1="New value" where ID=12; 

commit;"

but I can not to inform other user that the record is edited?

 

MAIN TARGET:

How to get information that current record is edited? Which function can I use?

 

* as long as i know, the only message you could create is just

* raise notice 'ur_message'; or raise exception 'ur_error_message';

* and the only message that delphi could read is just raise exception.

 

* And if you wanna make your own message, perhaps you must using try and except

* and you could give your own message via ShowMessage('ur_message') or other

* Class object on delphi.

 

 

Please help me, Maybe someone have similar problem?

Greetings,

Daniel

 

Hope it Help, GOD Bless You and Bravo PostgreSQL.

Hi,
No, I am sure that I can get this message from Delphi. Check it on web site www.microolap.com
For example when I try to put  a non-unique value in a primary key I get message from database that I get conflict with
primarykey :-) 
of course I use raise ... except ... but everything work perfectly...  error handling works correctly :-)

so I am waiting for an answer for my question how check that the rekord is currently edited,
Greetings,
Daniel

>
>
>*********** REPLY SEPARATOR ***********
>
>On 2003-08-28 at 17:42 Yudha Setiawan wrote:
>
>Of course I can lock record with syntax
>"Begin;
>        select * from table1 where ID=12 for update;
>        update table1 set field1="New value" where ID=12;
>commit;"
>but I can not to inform other user that the record is edited?
>
>MAIN TARGET:
>How to get information that current record is edited? Which function can I
>use?
>
>* as long as i know, the only message you could create is just
>* raise notice 'ur_message'; or raise exception 'ur_error_message';
>* and the only message that delphi could read is just raise exception.
>
>* And if you wanna make your own message, perhaps you must using try and
>except
>* and you could give your own message via ShowMessage('ur_message') or
>other
>* Class object on delphi.
>
>
>Please help me, Maybe someone have similar problem?
>Greetings,
>Daniel
>
>Hope it Help, GOD Bless You and Bravo PostgreSQL.

Daniel Michał <danielosch@o2.pl> writes:
> I have to lock one row in table1 for user1. In the same time other users sh=
> ould be able to read this record but when other user for example user2 want=
>  to edit this record  user2 should get information "The row you try to edit=
>  is currently edit" - or sometihing similar.

> Of course I can lock record with syntax "Begin; select * from table1 where =
> ID=3D12 for update; update table1 set field1=3D"New value" where ID=3D12; c=
> ommit;"
> but I can not to inform other user that the record is edited?

Try using the contrib/userlock/ functions.
        regards, tom lane