Обсуждение: keeping images in a bytea field on AWS RDS
I am using postgresql on RDS. I need to upload an image to the table. I understand that I need to set the PGDATA directory and place the image file in it, before setting the path in the bytea field. But how do I set PGDATA if I don't have the ability to set an environment variable, and don't have access to the following on an AWS controlled installation?
$ initdb -D /usr/local/pgsql/data or
pg_ctl -D /usr/local/pgsql/data initdb
> On Mar 31, 2020, at 12:49, Richard Bernstein <richb201@gmail.com> wrote: > > I am using postgresql on RDS. I need to upload an image to the table. I understand that I need to set the PGDATA directoryand place the image file in it, before setting the path in the bytea field. But how do I set PGDATA if I don't havethe ability to set an environment variable, and don't have access to the following on an AWS controlled installation? No, that's not how you upload images to a bytea field; you use the standard client library and send the bytea data over thatway. It works the same on community PostgreSQL and RDS. PostgreSQL handles managing the bytea data for you. Note thatfor very large binary objects, storing them in the database is not going to be very efficient versus keeping them inthe filesystem (noting, of course, that you don't have access to the filesystem of an RDS server). -- -- Christophe Pettus xof@thebuild.com
On Tue, 2020-03-31 at 15:49 -0400, Richard Bernstein wrote:
I am using postgresql on RDS. I need to upload an image to the table. I understand that I need to set the PGDATA directory and place the image file in it, before setting the path in the bytea field. But how do I set PGDATA if I don't have the ability to set an environment variable, and don't have access to the following on an AWS controlled installation?
You don't put a file path into a bytea field or do anything with the database filesystem. You insert the contents of the actual file into the field using SQL commands.
On 3/31/20 2:49 PM, Richard Bernstein wrote:
initdb is definitely not what you want to do just to load an image into an exiting database.
I am using postgresql on RDS. I need to upload an image to the table. I understand that I need to set the PGDATA directory and place the image file in it, before setting the path in the bytea field. But how do I set PGDATA if I don't have the ability to set an environment variable, and don't have access to the following on an AWS controlled installation?$ initdb -D /usr/local/pgsql/data
orpg_ctl -D /usr/local/pgsql/data initdb
initdb is definitely not what you want to do just to load an image into an exiting database.
--
Angular momentum makes the world go 'round.
Angular momentum makes the world go 'round.
> On Mar 31, 2020, at 13:52, Ron <ronljohnsonjr@gmail.com> wrote: > initdb is definitely not what you want to do just to load an image into an exiting database. I think there may be some confusion on the OP's part because many sources give out *advice* to put a filesystem path, ratherthan the entire actual binary object, into the database... and that's still good advice, even on RDS! It just meansthat path needs to be a URI or some other piece of metadata that points to a different server, rather than the RDS server. -- -- Christophe Pettus xof@thebuild.com