Re: How to display stored image as bytea or as large objects?

2021. 07. 14. 22:17 keltezéssel, Ho John Lee írta:
> If you have the binary data for the image in the bytea field, DBeaver
> will display the image when you select that field in table view of the data.
> The field will display something like "ÿØÿà  JFIF   [nnnnn]" in the row
> (first part of data as unicode, and data length in bytes), you won't see
> the image unless you put focus on it.

I will try this, but do not know which SQL code will store an image in a
bytea data type column?

Could you give such SQL code please?

At the moment I have stored image in an oid data type column.


> .--hjl

> On Wed, Jul 14, 2021 at 12:57 PM Csanyi Pal <csanyipal@gmail.com
> <mailto:csanyipal@gmail.com>> wrote:
>
>     Hi,
>
>     I am a novice in postgresql language.
>
>     By reading the documentation about storing binary data in postgresql
>     database, I realize that that one can store images as binary data by
>     using bytea or BLOB data types.
>
>     I am running postgresql on Ubuntu 20.04.2 LTS and using pgAdmin4 in
>     Desktop mode.
>
>     I have stored an image in one of my table with this command:
>
>     <code>
>     insert into leckek
>     (az, a_tanitas_nyelve, mely_negyedevben, mely_osztalyban,
>     mely_tagozaton, mely_orakon, a_tanitas_temaja,
>        a_lecke_neve, a_lecke_gyakorlati_reszenek_neve,
>     a_lecke_gyakorlati_reszenek_dokumentuma,
>        a_lecke_elmeleti_reszenek_neve,
>     a_lecke_elmeleti_reszenek_dokumentuma,
>     a_lecke_elmeleti_reszenek_tesztje)
>     values (default, 'Hu', 1, 5, 'b', '1-2', 'Élet és mukakörnyezet',
>                      'A technika és technológia fogalma, szerepe és
>     jelentősége',
>                      'másolás',
>                      default,
>                      'A lényeg',
>
>     lo_import('/home/pali/Irataim/Iskola/IskolaEv_2020_2021/MuszakiOraim/Digitalis_Tananyagok_Orakra/Hu/5/5_osztaly_Tananyag_01_02_orara.png'),
>                      default)
>     </code>
>
>     so I have now in this table the first row:
>     1       "Hu"    1       5       "b"     "1-2  " "Élet és
>     mukakörnyezet" "A technika és
>     technológia fogalma, szerepe és jelentősége"    "másolás"           
>         "A lényeg"      "16800"
>
>     Here the 16800 is the OID of the binary data, the image.
>
>     I would like to know how can one display this stored image somehow by
>     using some IDE for manage databases?
>
>     In applications like pgAdmin4, Libreoffice Base, pgModeler, DBeaver one
>     can't display this stored image.
>
>     In SQLiteBrowser (this is an IDE for SQLite databases) one can display
>     with easy the stored image.
>
>     So is there an easy way to display a stored image in postgresql?
>
>     --
>     Best,
>     from Paul