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 Trigger or procedure?		  New Topic  Reply to Topic
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philtonite
Starting Member

South Africa
6 Posts
Posted - 04/08/2008 :  10:19:34  Show Profile  Reply with Quote
Hi! I would like to know if someone could help. I'm not sure whether to use a trigger or a procedure for the following: in a BUILDING table it has a TOTALASM (ASM - assignable square metres) field which should be calculated by adding the SQMETRES of each room in the ROOM table which corresponds to a particular room. How should I do this? With a trigger or procedure?

blindman
Flowing Fount of Yak Knowledge

USA
2365 Posts
Posted - 04/08/2008 :  10:49:07  Show Profile  Reply with Quote
Trigger on the ROOM table.

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visakh16
Very Important crosS Applying yaK Herder

India
47173 Posts
Posted - 04/08/2008 :  12:05:48  Show Profile  Reply with Quote
quote:
Originally posted by philtonite

Hi! I would like to know if someone could help. I'm not sure whether to use a trigger or a procedure for the following: in a BUILDING table it has a TOTALASM (ASM - assignable square metres) field which should be calculated by adding the SQMETRES of each room in the ROOM table which corresponds to a particular room. How should I do this? With a trigger or procedure?

You want this calculation to happen everytime when a new ROOM record is added? then use trigger.
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mailbalajijagan@gmail.com
Starting Member

2 Posts
Posted - 04/09/2008 :  03:33:02  Show Profile  Reply with Quote
Create a View by joining the BUILDING and ROOM table and have the calculation done in the view. This view will be getting updated for the corresponding DML operations
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philtonite
Starting Member

South Africa
6 Posts
Posted - 04/09/2008 :  06:53:21  Show Profile  Reply with Quote
Thanx!!! I'll give it a go when I get back to work!
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philtonite
Starting Member

South Africa
6 Posts
Posted - 04/14/2008 :  10:54:05  Show Profile  Reply with Quote
thanx guys that worked! i got another question if you guys can help? i'm buidling a front-end for db on mssql 2000. i have made a jdbc odbc connector to my server but when i want to select tables it says that none of them have primery keys but they all do. even in netbeans database explorer it shows that the tables have primary keys! any ideas?
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blindman
Flowing Fount of Yak Knowledge

USA
2365 Posts
Posted - 04/14/2008 :  12:28:41  Show Profile  Reply with Quote
Script out the DDL for one of the tables it claims has not primary keys, and post it here.

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philtonite
Starting Member

South Africa
6 Posts
Posted - 04/15/2008 :  04:46:47  Show Profile  Reply with Quote
thanx for your help. i think this is what you want:

/****** Object: Table [dbo].[CAMPUS] Script Date: 15/04/2008 10:45:02 ******/
CREATE TABLE [dbo].[CAMPUS] (
[CAMPCODE] [varchar] (3) COLLATE Latin1_General_CI_AS NOT NULL ,
[CAMPNAME] [varchar] (50) COLLATE Latin1_General_CI_AS NOT NULL ,
[CAMPPSTC] [varchar] (4) COLLATE Latin1_General_CI_AS NULL ,
[CAMPPROV] [varchar] (2) COLLATE Latin1_General_CI_AS NOT NULL ,
[CAMPPREFIX] [varchar] (10) COLLATE Latin1_General_CI_AS NULL ,
[dude] [uniqueidentifier] NULL
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[CAMPUS] WITH NOCHECK ADD
CONSTRAINT [PK_CAMPUS] PRIMARY KEY CLUSTERED
(
[CAMPCODE]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[CAMPUS] ADD
CONSTRAINT [FK_CAMPUS_CAMPPROVCODES] FOREIGN KEY
(
[CAMPPROV]
) REFERENCES [dbo].[CAMPPROVCODES] (
[CAMPPROV]
)
GO
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philtonite
Starting Member

South Africa
6 Posts
Posted - 04/15/2008 :  05:50:33  Show Profile  Reply with Quote
i even tried the example databases that come with ms sql 2000 and netbeans also does not see their primary keys! i've tried also instead to create unique not null fields as the primary keys but with no success!
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blindman
Flowing Fount of Yak Knowledge

USA
2365 Posts
Posted - 04/15/2008 :  08:57:14  Show Profile  Reply with Quote
Sure looks like your table has a primary key to me.
So the problem is not with your database, but with net beans.
See if there is a net bean forum where people could point you in the right direction.

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