primary key problem

[Irfan]

hi,

when i add a row in a table of a dataset (using dt.rows.add), i expect the
primary key value to be gernarated automatically as i have set it to
Autonumber in access. But instead of generating autonumber, it does not do
anything, which results in null value in the primary key col of new row.

Although remedy to the above is, not to include the primary key in the
selectCommand so that Access does it itself. But i need to include the
primary key in the table because i have to set parent - child relationalship
with another table.

Could someone advise please how can the primarykey of a table in a dataset
to be populated by a unique identifier and not by a null value.

TIA
Irfan

[Cor Ligthert]

Re: primary key problem

Irfan,

Is that table in an existing database or is it a new database?

Cor

[Irfan]

Re: primary key problem

Cor,

It is an existing database in MS Access, the tables are already created in
the actual database and now i have transferred them to into dataset.



irfan

"Cor Ligthert" <notmyfirstname @planet.nl> wrote in message
news:%23aA4pGod FHA.2776@TK2MSF TNGP10.phx.gbl. ..[color=blue]
> Irfan,
>
> Is that table in an existing database or is it a new database?
>
> Cor
>[/color]

[Paul Clement]

Re: primary key problem

On Tue, 21 Jun 2005 17:22:39 +0100, "Irfan" <irfan@asc-ltd.co.uk> wrote:

¤ hi,
¤
¤ when i add a row in a table of a dataset (using dt.rows.add), i expect the
¤ primary key value to be gernarated automatically as i have set it to
¤ Autonumber in access. But instead of generating autonumber, it does not do
¤ anything, which results in null value in the primary key col of new row.
¤
¤ Although remedy to the above is, not to include the primary key in the
¤ selectCommand so that Access does it itself. But i need to include the
¤ primary key in the table because i have to set parent - child relationalship
¤ with another table.
¤
¤ Could someone advise please how can the primarykey of a table in a dataset
¤ to be populated by a unique identifier and not by a null value.

See the following:

HOW TO: Retrieve the Identity Value While Inserting Records into Access Database By Using Visual
Basic .NET

http://support.microsoft.com/kb/815629/EN-US/

Paul
~~~~
Microsoft MVP (Visual Basic)

[Irfan]

Re: primary key problem


This is what i am doing to add a new row,

Dim dr As DataRow = dtComboBoxdata. NewRow
'set all columns
dr("ElementName ") = EleName
dr("lineloadIDf k") = lineID
dr("fileIDfk") = fileID
dtComboBoxdata. Rows.Add(dr)
da.Update(ds, "comboBoxda ta")

"Cor Ligthert" <notmyfirstname @planet.nl> wrote in message
news:%23aA4pGod FHA.2776@TK2MSF TNGP10.phx.gbl. ..[color=blue]
> Irfan,
>
> Is that table in an existing database or is it a new database?
>
> Cor
>[/color]

[Cor Ligthert]

Re: primary key problem

Irfan,

I am not sure anymore of the missingscheme method helps this, you can try
it.

http://msdn.microsoft.com/library/de...ctiontopic.asp

My idea was not and than you have to add the autoincrement properties.
http://msdn.microsoft.com/library/de...mberstopic.asp

If you have this in a parentchildrela tion this is AFAIK a hell of a job,
because the identifiere in the dataset is not the original one, however a
substitute. The original one is given at the insert time (and than you can
find the value of the indentifier as is described at @@Identity in Pauls
link). I would in this case first create the identifier and than add the
childs.

HoweverI prefer to use a Guid as the uniqueidentifie r.

http://msdn.microsoft.com/library/de...classtopic.asp

Probably do you have a now a long road to go.

I hope this helps something.

Cor

[Irfan]

Re: primary key problem

thanks, Cor, seems there is not a short cut.

I will go through the links, thanks again
irfan


"Cor Ligthert" <notmyfirstname @planet.nl> wrote in message
news:e6NjhrodFH A.2736@TK2MSFTN GP12.phx.gbl...[color=blue]
> Irfan,
>
> I am not sure anymore of the missingscheme method helps this, you can try
> it.
>
> http://msdn.microsoft.com/library/de...ctiontopic.asp
>
> My idea was not and than you have to add the autoincrement properties.
> http://msdn.microsoft.com/library/de...mberstopic.asp
>
> If you have this in a parentchildrela tion this is AFAIK a hell of a job,
> because the identifiere in the dataset is not the original one, however a
> substitute. The original one is given at the insert time (and than you can
> find the value of the indentifier as is described at @@Identity in Pauls
> link). I would in this case first create the identifier and than add the
> childs.
>
> HoweverI prefer to use a Guid as the uniqueidentifie r.
>
> http://msdn.microsoft.com/library/de...classtopic.asp
>
> Probably do you have a now a long road to go.
>
> I hope this helps something.
>
> Cor
>
>
>
>[/color]