PostgeSQL \ lo_import and how to get the resulting OID into the UPDATE command?
I am working with Postgres 9.0 and I have an application where I need to insert images into remote server
. Therefore, I use:
"C:\Program Files\PostgreSQL\9.0\bin\psql.exe" -h 192.168.1.12 -p 5432 -d myDB -U my_admin -c "\lo_import 'C://im/zzz4.jpg'";
Where
192.168.1.12
is the IP address of the server system
5432
- port number
myDB
- server database name
my_admin
is the username
"\lo_import 'C://im/zzz4.jpg'"
is the request that is being run.
After the image has been inserted into the database, I need to update the row in the table like this:
UPDATE species
SET speciesimages=17755; -- OID from previous command.. how to get the OID ??
WHERE species='ACCOAA';
So my question is, how do I return OID
after \lo_import
in psql?
I tried to run \lo_import 'C://im/zzz4.jpg'
in Postgres, but I get an error:
ERROR: syntax error at or near ""\lo_import 'C://im/zzz4.jpg'""
LINE 1: "\lo_import 'C://im/zzz4.jpg'"
I also tried this:
update species
set speciesimages=\lo_import 'C://im/zzz4.jpg'
where species='ACAAC04';
But I am getting this error:
ERROR: syntax error at or near "\"
LINE 2: set speciesimages=\lo_import 'C://im/zzz4.jpg'
^
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Since your file is on your local machine and you want to import the blob to a remote server, you have two possibilities:
1) Transfer the file to the server and use the server function :
UPDATE species
SET speciesimages = lo_import('/path/to/server-local/file/zzz4.jpg')
WHERE species = 'ACAAC04';
2) Use psql meta command as if you have.
But you cannot mix psql meta commands with SQL commands, which is not possible.
Use the psql variable :LASTOID
in the command UPDATE
you run right after the meta command \lo_import
in the same psql session:
UPDATE species
SET speciesimages = :LASTOID
WHERE species = 'ACAAC04';
In a script that (works on Linux, I'm not familiar with Windows shell scripting):
echo "\lo_import '/path/to/my/file/zzz4.jpg' \\\\ UPDATE species SET speciesimages = :LASTOID WHERE species = 'ACAAC04';" | \
psql -h 192.168.1.12 -p 5432 -d myDB -U my_admin
-
\\
- separator meta command. You need to double the line\
per line""
because the shell interprets one level. -
\
before the newline is a line continuation in Linux shells.
Alternative syntax (tested on Linux again):
psql -h 192.168.1.12 -p 5432 -d myDB -U my_admin << EOF
\lo_import '/path/to/my/file/zzz4.jpg'
UPDATE species
SET speciesimages = :LASTOID
WHERE species = 'ACAAC04';
EOF
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After importing the image using this command:
\lo_import '$imagePath' '$imageName'
Then you can find the description of the binary by pg_catalog.pg_largeobject_metadata
querying the table that stores the desired oid value.
Those:
"SELECT oid as `"ID`",
pg_catalog.obj_description(oid, 'pg_largeobject') as `"Description`"
FROM pg_catalog.pg_largeobject_metadata WHERE pg_catalog.obj_description(oid,'pg_largeobject') = '$image' limit 1 "
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