问题
I have been looking everywhere (google, stackoverflow, etc.) for some documentation on how to use the PostgreSQL pg_read_binary_file() function.
The only meaningful thing I can find is this page in the official documentation.
Every time I try to use this function I get an error.
For example:
SELECT pg_read_binary_file('/some/path/and/file.gif');
ERROR: absolute path not allowed
or
SELECT pg_read_binary_file('file.gif');
ERROR: could not stat file "file.gif": No such file or directory
Do I need to have my file in a specific directory for Postgres to have access to it? If so what directory?
If it matters, the reason I am looking at this function is because I am trying to insert a file into the database without doing crazy things.
回答1:
As stated by @a_horse_with_no_name and @guedes the solution is to ensure that the file being uploaded is on the server in the PGDATA directory.
The postgres documentation does state the file location as a requirement.
Additionally, I made a symlink from another directory to the PGDATA directory so that I would not disturb any of the postgres data structure. This seems to be working well and I don't have to do any of the above crazy things.
来源：https://stackoverflow.com/questions/16048649/postgresql-9-x-pg-read-binary-file-inserting-files-into-bytea