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Anja
Guest
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 Posted: Tue Nov 25, 2003 8:16 am Post subject: Primary Key in TTable descendant |
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Hi folks,
I'm trying to create a descendant of TTable with the ability to return
the value of the current primary key.
So I wanted to create a component TasTable with read-only property
PrimaryKey, which then I could use in a statement like
MyTable.SetRange( Mytable.PrimaryKey, Mytable.PrimaryKey)
to filter the range to only the current record.
My problem : which type does my property has to have?
So: property PrimaryKey : ????
read GetPrimaryKey ;
Be aware that a Primary key can be composed of several values of
different types.
Thanks for your replys.
Anja.
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John McCarten
Guest
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| Posted: Sat Dec 06, 2003 1:21 pm Post subject: Re: Primary Key in TTable descendant |
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"Anja" wrote
| Quote: | ... I wanted to create a component TasTable with read-only property
PrimaryKey, which then I could use in a statement like
MyTable.SetRange( Mytable.PrimaryKey, Mytable.PrimaryKey)
to filter the range to only the current record.
My problem : which type does my property has to have?
So: property PrimaryKey : ????
read GetPrimaryKey ;
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property PrimaryKey: TasPrimaryKey read GetPrimaryKey;
How you construct TasPrimaryKey depends on what data base/stream/source is
behind TasTable.
j.
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Anja
Guest
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| Posted: Mon Dec 08, 2003 9:17 am Post subject: Re: Primary Key in TTable descendant |
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"John McCarten" <johnmccarten[ns]@ihug.co.nz> wrote:
| Quote: | "Anja" wrote
... I wanted to create a component TasTable with read-only property
PrimaryKey, which then I could use in a statement like
MyTable.SetRange( Mytable.PrimaryKey, Mytable.PrimaryKey)
to filter the range to only the current record.
My problem : which type does my property has to have?
So: property PrimaryKey : ????
read GetPrimaryKey ;
property PrimaryKey: TasPrimaryKey read GetPrimaryKey;
How you construct TasPrimaryKey depends on what data base/stream/source is
behind TasTable.
j.
All my tables are Paradox tables, and a primary key can be composed of any combination of strings or integers. I don't use currency fields or blob's in a primary key. |
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