Thread: Re: [Qform-general] Using derby driver does not show any tables in the QueryForm

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Hi Dave,

Thanks a lot!  I am using your new qform.jar file and it works great.  The DDL tab in the Table Metatdata tab is nice too.

Is there any chance in the future you'll add the functionality to the tool of being able to execute DDL?

Regards,

Susan

Dave Glasser <dgl...@po...> wrote:
On Fri, 3 Jun 2005 15:08:45 -0700 (PDT), Susan Cline
wrote:

>Hi,
> 
>I just downloaded QueryForm today and I'm trying to use it with the Derby embedded
>and client drivers. I'm successfully making a connection, but when I try to use the QueryForm,
>New Query Form menu item I don't see any tables listed. The Table Owner shows the value
>, and no other schemas are in the drop down.
> 
>In Derby the default schema is APP which does not contain any tables, but can you use
>the tool to create a new table in the default schema?
> 
>Even if I connect to the derby database as user 'SYS', which exists as a schema within
>Derby, I can not see anything in the Query Form other than .
> 
>Any thoughts on why this is happening?

QueryForm reads the list of tables from the database with this call:

ResultSet rs = 
dbmd.getTables(null, null, "%", new String[] {"VIEW", "TABLE"});

The {"VIEW", "TABLE"} array is supposed to filter out things like
system tables, temp tables, etc. When you create a new database in
Derby, all of its system tables have type "SYSTEM TABLE". (It's
actually more JDBC compliant in that regard than most commercial
databases.) That's why they don't show up in QueryForm's list of
tables. And any schemas for which no tables are returned by the
getTables() call won't show up at all in the list in the dialog, since
everything comes from the getTables() call. The is
actually intended for databases where the table schema is always null
or "". (Access is the only example that comes to mind at the moment.)
So, when QueryForm gets back zero tables, it displays 
with an empty list of tables. I guess I could call
DatabaseMetaData.getSchemas() to get the schemas without tables, just
so they'll show up in the list.

I'll send you a qform.jar off-list with this code:

ResultSet rs = 
dbmd.getTables(null, null, "%", null);

Overwrite your current qform.jar, and it should show you all of the
system tables in the SYS and SYSIBM schemas. The APP schema won't show
up until there's actualy tables in it. That code will also contain
everything slated for the next release, which hopefully I'll get
around to doing this weekend.

BTW, there's no way to create tables with QueryForm. But one thing you
might find handy in the code I'm going to send you (which is not in
the current release) is a DDL tab on the table metadata window, which
shows a basic CREATE TABLE statement for a particular table. It's
handy if you want to replicate a table from one database to another
but the DDL isn't available.

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