Re: [gnome-db] Partial Meta Store update.

2009/7/20 Bas Driessen <[email protected]>

>  On Sun, 2009-07-19 at 13:31 +0200, Vivien Malerba wrote:
>
>
>
>  2009/7/19 Bas Driessen <[email protected]>
>
>  Hello,
>
> Question regarding partial meta store update. I found that the following to
> update a single table does not appear to work:
>
>        * g_print ("\nPartial metastore update for table '%s'...\n",
> TABLE_NAME);*
> *        GdaMetaContext mcontext = {"_tables", 1, NULL, NULL};*
> *        mcontext.column_names = g_new (gchar *, 1);*
> *        mcontext.column_names[0] = "table_name";*
> *        mcontext.column_values = g_new (GValue *, 1);*
> *        g_value_set_string ((mcontext.column_values[0] = gda_value_new
> (G_TYPE_STRING)), TABLE_NAME);*
> *        if (!gda_connection_update_meta_store (connection, &mcontext,
> &error))*
> *                return -1;*
>
> After this, my meta store is NOT updated.
>
>
> This may depend on the actual value of TABLE_NAME, specifically if it is a
> mix of upper and lower case, or if it's a reserved keyword. The proper way
> is:
> *tmp = gda_sql_identifier_quote (TABLE_NAME, cnc, NULL, TRUE, FALSE); //
> or with the last argument being TRUE, see the doc*
> *g_value_set_string ((mcontext.column_values[0] = gda_value_new
> (G_TYPE_STRING)), tmp);*
> *g_free (tmp);*
>
> Note that this is brand new (just been sorted out) and will require the
> master or LIBGDA_4.0 branches up to date.
>
>
>
>  Thanks Vivien, but this unfortunately is not still not working. Let me
> explain my testing scenario and if I understand this the correct way.
>
> -1 I have a database with a table called "groups"
> -2 I run the gda_connection_update_meta_store to update the meta store.
> -3 I look into the meta store with sqlite3 and execute "select * from
> _tables". I can see the "groups" table in that list.
>

So far so good:)


>
> -4 I add a table called "parts"
> -5 I run the code above (with your modification) where the TABLE_NAME is
> set to "parts" (without quotes).
> -6 I execute "select * from _tables" and I expect to see the "parts" entry,
> but it is not there.
>

It should be there...


>
> -7 I execute the gda_connection_update_meta_store to do the full update.
> -8 I execute "select * from _tables" and I expect to see the "parts" entry
> and now it is there.
>
> My questions:
>
> -1 Is my understanding of how this mechanism should work correct?
>

Ye, it is.


>
> -2 Anything (obvious) that is not in the code above?
> -3 I use "gda_meta_store_new_with_file" to open my (sqlite3) meta store
> database. Is it possible that somehow it is mixing up the internal (memory)
> database with the external one?
>

I don't think so, but I'd prefer to have some actual code to look at before
I can say...

If you send me a standlone program which shows the bug, I'll make the
necessary corrections (either to Libgda or to your code).

Vivien

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