Blob field null.

This is just a note.

say I have blob field, conatining like 2 pages of .pdf

At data tab it generates automaticaly

select ....LEFT(pdf_blob, 256)

So record just came into table and I see NULL in that field

reaplay filter/refresh and I see same recors with blob contence instead of seconds ago NULL

Any explanation on that ? MySql.

Ahh forget that, I insert record and then do update on blob field. It all just works so slow ....