Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1aKopR-0005N2-1u for pgsql-sql@arkaria.postgresql.org; Sun, 17 Jan 2016 15:01:17 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.84) (envelope-from ) id 1aKopQ-0001fz-BV for pgsql-sql@arkaria.postgresql.org; Sun, 17 Jan 2016 15:01:16 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84) (envelope-from ) id 1aKopN-0001eW-6C for pgsql-sql@postgresql.org; Sun, 17 Jan 2016 15:01:13 +0000 Received: from post.visena.com ([46.226.10.50]) by makus.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.84) (envelope-from ) id 1aKopJ-0000MV-Gf for pgsql-sql@postgresql.org; Sun, 17 Jan 2016 15:01:11 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=visena.com; s=20141101.wh; h=Content-Type:MIME-Version:Subject:In-Reply-To:Message-ID:To:From:Date; bh=rjnuA7g/0S1Kq/s9SxrozBEkYvNXXpBsSOdsMBGDXJM=; b=W3WdpESilRlc1jvDeDq9wdagi87o1HFxJYvKC0YqWpbEzQADxw8MIQ21HhpgMtNtqUYpjazjOmn/c2hjhbrSBo+jLP3lga6G4PYiXIOMLb1uHFd5QrOLUc9NCj41yfCG+UTU1vgtONOr3S/cXXmFaymw837jLkoPJ20FwoiuJ1A=; Received: from [10.0.1.10] (helo=tc7-visena.wh.internal.visena.com) by post.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1aKopD-0001L5-Q0 for pgsql-sql@postgresql.org; Sun, 17 Jan 2016 16:01:05 +0100 Received: from localhost ([127.0.0.1] helo=tc7-visena.wh.internal.visena.com) by tc7-visena.wh.internal.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1aKopD-0002zR-Ou for pgsql-sql@postgresql.org; Sun, 17 Jan 2016 16:01:03 +0100 Date: Sun, 17 Jan 2016 16:01:03 +0100 (CET) From: Andreas Joseph Krogh To: pgsql-sql@postgresql.org Message-ID: In-Reply-To: <563742622.6654475.1452960485450.JavaMail.yahoo@mail.yahoo.com> Subject: Re: BYTEA vs BLOB MIME-Version: 1.0 X-Mailer: Visena Mail 2.0.0-SNAPSHOT X-Spam-Score: -1.0 X-Spam-Report: SpamAssasin (score=-1.0, required 5.0 ALL_TRUSTED=-1, HTML_MESSAGE=0.001) X-Pg-Spam-Score: -2.0 (--) Content-Type: multipart/related; boundary="----=_Part_706_1985115331.1453042863681" List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-sql Precedence: bulk Sender: pgsql-sql-owner@postgresql.org ------=_Part_705_502612107.1453042863681 Content-Type: multipart/related; boundary="----=_Part_706_1985115331.1453042863681" ------=_Part_706_1985115331.1453042863681 Content-Type: multipart/alternative; boundary="----=_Part_707_640257180.1453042863693" ------=_Part_707_640257180.1453042863693 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable P=C3=A5 l=C3=B8rdag 16. januar 2016 kl. 17:08:05, skrev Eugene Yin >: When use Ora2Pg to migrate the Oracle to Pg, the BLOB data type in Oracle w= ill=20 supposedly be converted into BYTEA in Pg.=C2=A0 Is this achievable?=C2=A0= =C2=A0 =C2=A0 If so, after the data become BYTEA, can I further convert the BYTEA into OI= D=20 data type, and how to? =C2=A0 Here's how I converted a BYTEA-column to OID: =C2=A0 The table origo_file_rawdata contains a column named 'data' of type BYTEA. = The=20 trick is to add a new column, 'lo_data' of type=3DOID, populate it, then dr= op the=20 old column and rename 'lo_data' to 'data': begin; alter table origo_file_rawdata add column lo_data oid; do $$ declare= =20 loid oid; lfd integer; lsize integer; d origo_file_rawdata; begin for d = IN=20 (select * from origo_file_rawdata) loop loid :=3D lo_create(0); lfd :=3D= =20 lo_open(loid,131072); lsize :=3D lowrite(lfd, d.data); perform lo_close(lf= d); =20 update origo_file_rawdata set lo_data =3D loid where entity_id =3D d.entity= _id; end=20 loop;end; $$; alter table origo_file_rawdata alter column lo_data set not n= ull;=20 alter tableorigo_file_rawdata drop column data; alter table origo_file_rawd= ata=20 renamelo_data to data; commit; =C2=A0 Hope this helps. =C2=A0 -- Andreas Joseph Krogh CTO / Partner - Visena AS Mobile: +47 909 56 963 andreas@visena.com www.visena.com =C2=A0 ------=_Part_707_640257180.1453042863693 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable
P=C3=A5 l=C3=B8rdag 16. januar 2016 kl. 17:08:05, skrev Eugene Yin <= ;eugeneymail@ymail.com>:
When use Ora2Pg to= migrate the Oracle to Pg, the BLOB data type in Oracle will supposedly be = converted into BYTEA in Pg.=C2=A0 Is this achievable?=C2=A0=C2=A0
=C2=A0
If so, after the d= ata become BYTEA, can I further convert the BYTEA into OID data type, and h= ow to?
=C2=A0
Here's how I converted a BYTEA-column to OID:
=C2=A0
The table origo_file_rawdata co= ntains a column named 'data' of type BYTEA. The trick is to add a new colum= n, 'lo_data' of type=3DOID, populate it, then drop the old column and renam= e 'lo_data' to 'data':
begin;

alter table origo_file_rawdata add column lo_data oid;

do $$
declare
    loid o=
id;
    lfd in=
teger;
    lsize =
integer;
    d orig=
o_file_rawdata;
begin
    for d =
IN (select * from origo_file_rawdata) loop
        lo=
id :=3D lo_create(0);
        lf=
d :=3D lo_open(loid,131072);
        ls=
ize :=3D lowrite(lfd, d.data);
        pe=
rform lo_close(lfd);
    update=
 origo_file_rawdata set lo_data =3D loid where entity_id =3D d.entity_id;
    end lo=
op;
end;
$$;

alter table origo_file_rawdata alter column lo_data set not null;
alter table origo_file_rawdata drop column data;
alter table origo_file_rawdata rename lo_data to data;
commit;
=C2=A0
Hope this helps.
=C2=A0
--
Andrea= s Joseph Krogh
CTO / Partner<= /span> - Visena AS
Mobile: +47 90= 9 56 963
=3D""
=C2=A0
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