OpenEuphoria

Re: EDS 2 questions

• Posted by Robert Craig <rds at RapidEuphoria.com> Oct 13, 2003
• 483 views

jondolar wrote:
> 1- Lets suppose I have a database with 100 records but each record has 
> very big data sequences say 100,000 elements. Would EDS try to load 
> entire records for an append or an insert or maitain its disk blocks 
> allocation as per database.e and load only a portion of the data?

Using the functions in database.e, you have to read or write
an entire record (actually, the data or the key).
There is no way to directly update just a small portion of
one record on disk.

If you read the data for a record, append to it,
and write it back, EDS will try to store it in the same place
on disk if there's enough space, but otherwise EDS
will look for a big enough empty space in the .edb file.
As a last resort, EDS will store the data at the end of
the .edb file, thereby making the file bigger.

> 2- How many concurrent open tables does EDS support?

There is always one "current" database and one "current"
table. There are functions for choosing a new current
database and new current table. A database could have
millions of tables. If you want to copy data from one
table to another, you have to call a routine to explicitly
switch back and forth between the two tables.

Regards,
    Rob Craig
    Rapid Deployment Software
    http://www.RapidEuphoria.com