Re: [Pytables-users] Update a table.

[Francesc A. <fa...@py...>]

Hi Ahmad,

In addition to what Vicent has (correctly enough) told you, a couple of
suggestions:

- If you want to mix very large strings with small ones, and want to reduce
the amount of space used on disk, try to use compression (see chapter 5 of
User's Manual). In that way, you will be using only the necessary disk space
(or even less, depending on your data compressibility). It's a simple and
efficient way to simulate variable length records.

- If you insist in using true variable length strings, you may use a VLArray
combined with a VLString atom. That will provide you true (and unicode)
variable length strings. You can link the entries of the VLArray to your
tables by adding an integer field in the later where you can put the
reference to the entry in the VLArray.

This will hopefully allow you to find a workaround until I find time to
implement the VLTables, where fully variable length fields will be allowed.

Regards,

Francesc

A Dimecres 16 Juny 2004 17:18, Ahmad Hosseinzadeh va escriure:
> Hi,
> 
> I'm new to PyTables.
> I don't know how to declare a string field with
> variable length in my tables.
> Also I have problem with updating a table or array.
> I want to update a record of my table (PyTables) but I
> don't know how.
> I have the same problem with arrays in PyTables.
> My solution is to remove the previous one and create a
> new record or array but it is not efficient.
> Can anyone help me?
> 
> Thanks.
> Ahmad.
> 
> 
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-- 
Francesc Alted