Re: [gnome-db] Defined column size.

2009/6/23 Bas Driessen <[email protected]>

>  On Mon, 2009-06-22 at 15:09 +0200, Vivien Malerba wrote:
>
>
>
>  2009/6/22 Bas Driessen <[email protected]>
>
>  Hello,
>
> Question. In V3 there was the quick and convenient function:
> "gda_column_get_defined_size" to get the width of a returned column from the
> database. This no longer exists. I believe the solution should be something
> along the lines of:
>
> const GValue *value;
> value = gda_column_get_attribute (column, GDA_ATTRIBUTE_DEFINED_SIZE)
>
> This GDA_ATTRIBUTE_DEFINED_SIZE (or similar name)  does not exist. What is
> the best/quickest way to get this value? If possible a small code sample,
> which often makes things easier to understand.
>
>
> This feature was removed from the V4 because it was not reliable (I mean it
> worked in most cases but reported some wrong values sometimes).
>
> The best way to do this is to query the meta data associated to the tables,
> ie get information about tables and columns. However, because it takes some
> time, it's better to cache the result, so you'll have to modify a bit your
> program's structure for this.
>
> For an example about how to do this, please look at the samples/MetaStore/
> example, and the documentation (
> http://library.gnome.org/devel/libgda/4.0/gda-dict.html) which also has an
> lenghty introduction about meta data (if you have any remark about the doc.
> let me know so I can correct it).
>
> Understood. Will study the meta data structures. Thanks Vivien.
>

Ok, tell me if you have any problem...

Vivien

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