EEGLAB can work with a variety of different file types, including those that are exported from the OpenBCI GUI, as we saw in the previous post. PHP's PostgreSQL handler ( not PDO) includes very basic pg_copy_from and pg_copy_to functions which copy to/from a PHP array, which may not be efficient for large data sets.EEGLAB can be used for the analysis and visualization of EEG datasets recorded using OpenBCI hardware and software. ![]() Your application programming language may also have support for pushing or fetching the data, but you cannot generally use COPY FROM STDIN/ TO STDOUT within a standard SQL statement, because there is no way of connecting the input/output stream. Thus, file accessibility and access rights depend on the client rather than the server when \copy is used. \copy invokes COPY FROM STDIN or COPY TO STDOUT, and then fetches/stores the data in a file accessible to the psql client. Note that there is no terminating, because meta-commands are terminated by newline, unlike SQL commands.ĭo not confuse COPY with the psql instruction \copy. The psql command-line client has a special "meta-command" called \copy, which takes all the same options as the "real" COPY, but is run inside the client: \copy (Select * From foo) To '/tmp/test.csv' With CSV The underlying syntax for this is the COPY TO STDOUT command, and graphical tools like pgAdmin will wrap it for you in a nice dialog. The Postgres server doesn't need to know what file you're copying to, it just spits out the data and the client puts it somewhere. The other approach is to do the file handling on the client side, i.e. I've written a blog post expanding on this approach, including some examples of functions that export (or import) files and tables meeting strict conditions. You probably don’t want to let someone invoke your function and add rows on the end of your “users” table…
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