DataModule link durring design time
lazarus / 16-Databases

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Skot · 2006-02-14 15:53

Hello again,

One little thing, maybe it should be a want.  When I build apps,
usually like to put all my Queries and DataSources etc in a
DataModule.  However, in design time, I can't see how to get objects,
like TdbGrid, to recognise a DataSource in the DM.  If I type
DM.dsBlah in the DataSource param I get an error message, 'Invalid
Propery Value', but it shouldn't be.  The DM unit is in the Uses
clause.  Is there something else I need to do, or is this just the way
it is?

Not a big deal, I always write it into the CreateForm proc anyway,
just would be convenient sometimes.

Cheers.

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hadelmestre · 2009-07-05 18:00

Por lo que tengo entendido, el equipo de desarrollo estaria
solucionando esta instancia o "bug".
Es decir, por ahora no funciona
Atte.
Hectorr

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clauslack · 2009-07-05 22:56

In my case I have in the Object Inspector this property, without
problems.

In design time, SQLQuey1 (Form1)
Database -> FormDatos.IBConnection1

FormDatos is a TDataModule.

With Lazarus 0.9.27 and fpc 2.2.4 /2.2.5

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Lord_ZealoN · 2009-07-06 07:48

Quote from: Skot on February 14, 2006, 04:53:27 pmHello again,

One little thing, maybe it should be a want.  When I build apps,
usually like to put all my Queries and DataSources etc in a
DataModule.  However, in design time, I can't see how to get objects,
like TdbGrid, to recognise a DataSource in the DM.  If I type
DM.dsBlah in the DataSource param I get an error message, 'Invalid
Propery Value', but it shouldn't be.  The DM unit is in the Uses
clause.  Is there something else I need to do, or is this just the way
it is?

Not a big deal, I always write it into the CreateForm proc anyway,
just would be convenient sometimes.

Cheers.

Are you using lazarus 0.9.26-2? With svn version works ok.

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musicones · 2009-09-07 07:42

Hello,

I have the same problem (using Lazarus 0.9.26-2 / FPC 2.2.2). But I
know that it should work, because I have one link from Transaction in
ContactModule to the TIBConnection in DatabaseModule.

>> It's all about the Design-Mode. <<


Here is my design:

DatabaseModule: TDataModule contains: TIBConnection, TTransaction

ContactsModule: TDataModule contains:
  TTransaction -> linked to DatabaseModule.IBConnection (don't ask
how/why the linking worked, i don't know)
  TSQLQuery -> linked to TTransaction on same Module

Now I have tried two different approaches.
In both cases one link doesnt work:

1. TDataSource placed in ContactsModule and linked to TSQLQuery
    Trying to link from ContactsForm.Grid.DataSource to
ContactsModule.DataSource doesn't work

2. TDataSource placed in COntactsForm, linked to Grid
    Trying to link from ContactsForm.DataSource.DataSet to
ContactsModule.SQLQuery doesn't work.

What means doesn't work:

in uses part the according unit is set, e.g in ContactsForm .... uses
mContacts (ContactsModule)

1. The link is not shown in Object Inspector e.g. when you click on
DataSource or DataSet
2. Trying to write it manually tends to result in error Message:
'Invalid Propery Value'

If someone knows the trick....

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musicones · 2009-09-10 07:03

Hi again,

i've tried Lazarus 0.9.27 Snapshot of yesterday. There it seems to
work. So i suppose an bug in current release. I will wait for next
release then.

Edit:
I have found out why that doesn' work as i expected. Usually i use to
create and free the Datamodules myself runtime where i need them.
Therfore you have to throw out the Create in the project file. If you
do that, the controls do not recognize the DataSources and Querys in
the Datamodule. I used to do that in Delphi where it works without
problems. It seems that Lazarus doesn't support it.

regards
musicones