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Delphi 7 : Lookup Field?

Hi Experts,

I have an TDBGrid and would like the use to be able to pick from a dropdown in the list.
For example:

Table1:
ColorID INT PK
ColorCode VARCHAR(10)
Description VARCHAR(100)

Table2:
VehicleID INT PK
ColorID INT
RegNumber VARCHAR(20)

When inserting a new row in the DBGrid for Table2, I would like to user to be able to select from dropdown in grid from all the available colorcodes and after selecting the ColorID should be saved in this table.

I managed to get what I am looking by means of creating a new lookup field on my ADOTable Component for Table2. But when inserting a new row I receive the following error:

"raised exception class EOleException with message 'An unkown error has occurred.' Process stopped...."

Please advise.

SOLUTION

developmentguru

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Marius0188

ASKER

Here is a screenshot of my setup:
http://www.medalware.com/delphi_lookup.JPG

I use a normal TDBGrid and TADOTable components.

Thanks!

SOLUTION

Johnjces

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Marius0188

ASKER

I have build a demo app using Firebird database and Interbase components.
I have created a lookup table exactly as I have done with the ADO table components and it is WORKING here.

I guess there is something else about the TADOTable component.
Let me see if I can provide you with a demo.

Cheers

Marius0188

ASKER

Ok I have produced a demo for you:
http://www.medalware.com/demo_lookup.zip

Just connect both TIBDatabase & TADOConnection components to the databasis that is in a subfolder.
1 x Firebird DB
1 x MS SQL MDF DB

The firebird is working 100%.
The SQL db is giving me that nasty exception.

Thanks in advance!

Marius0188

ASKER

It looks like a bug in ADO.
http://qc.codegear.com/wc/qcmain.aspx?d=46248

Is there any work arounds?
Where can I get the latest Delphi 7 updates?

Thanks!

Marius0188

ASKER

Can one connect to SQL 2005 db without using ADO components?
Is there any other good alternative components or methods one can try?

ASKER CERTIFIED SOLUTION

RickJ

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Marius0188

ASKER

Yes I do have that update.
But if I remember correctly, when installing that update it prompt to notify me about missing files where after I just clicked ignore. Maybe it has something to do with that.

Mmmmh, I wonder if I can just update the ADO dcu's etc by getting them from you.
Will that not work?

RickJ

Much cleaner to get your intall to work correctly, but worth a shot I guess.
Would back up before attempting.
Here you go.
http://www.logancontracting.com.au/ado/ado.zip

Marius0188

ASKER

Nope, still not working.

Are you also using Delphi 7 Enterprise?

RickJ

Delphi 7 pro. I would have thought the ado stuff would have been the same. But I could be wrong.
Not sure how else I can help you...

Marius0188

ASKER

You don't think it might be the TDBGrid component?
Maybe you must sent me your source and let me try that.

RickJ

I still think getting your install correct would be a better way to go. But again,
Here you go.
http://www.logancontracting.com.au/ado/dbgrids.zip

Marius0188

ASKER

Yip, after this one I will go for re-install and then apply that 7.1 update.
But need a quick fix because installing all my components from start takes 1-2 days.

Enjoy

Marius0188

ASKER

Ok but another thing is:
It is only in the compiler (IDE) that I get the exception EOleException.

When running outside the IDE no problem.
Should I still be worried?

Marius0188

ASKER

Ok I will accept that this might be an installation problem.
Have not tested yet but will try to re-install as soon as I have time available.

Lets split the points....

Thanks to all!