Re: Image storage questions
От | Joshua D. Drake |
---|---|
Тема | Re: Image storage questions |
Дата | |
Msg-id | 428BAC1D.80508@commandprompt.com обсуждение исходный текст |
Ответ на | Re: Image storage questions ("Ed L." <pgsql@bluepolka.net>) |
Ответы |
Re: Image storage questions
("Ed L." <pgsql@bluepolka.net>)
|
Список | pgsql-general |
> I was following this: > > http://www.postgresql.org/files/documentation/books/aw_pgsql/node96.html > > "Because large objects use the local filesystem, users connecting > over a network cannot use lo_import or lo_export()." > > Confirmed using psql. > > What api/language are you using? Is this possible to do through > DBI? If you don't use lo_import/lo_export, how do you > insert/retrieve images? Pointers to docs are welcomed! I have done it via PHP and I can definately insert with perl remotely (although I don't recall ever exporting): Creates a new large object and returns the object-id. $mode is a bit-mask describing different attributes of the new object. Use the following con- stants: $dbh->{pg_INV_WRITE} $dbh->{pg_INV_READ} Upon failure it returns undef. $lobj_fd = $dbh->func($lobjId, $mode, ’lo_open’); Opens an existing large object and returns an object-descriptor for use in subsequent lo_* calls. For the mode bits see lo_create. Returns undef upon failure. Note that 0 is a perfectly correct object descriptor! $nbytes = $dbh->func($lobj_fd, $buf, $len, ’lo_write’); Writes $len bytes of $buf into the large object $lobj_fd. Returns the number of bytes written and undef upon failure. $nbytes = $dbh->func($lobj_fd, $buf, $len, ’lo_read’); Reads $len bytes into $buf from large object $lobj_fd. Returns the number of bytes read and undef upon failure. $loc = $dbh->func($lobj_fd, $offset, $whence, ’lo_lseek’); Change the current read or write location on the large object $obj_id. Currently $whence can only be 0 (L_SET). Returns the current location and undef upon failure. $loc = $dbh->func($lobj_fd, ’lo_tell’); Returns the current read or write location on the large object $lobj_fd and undef upon failure. $lobj_fd = $dbh->func($lobj_fd, ’lo_close’); Closes an existing large object. Returns true upon success and false upon failure. $lobj_fd = $dbh->func($lobj_fd, ’lo_unlink’); Deletes an existing large object. Returns true upon success and false upon failure. $lobjId = $dbh->func($filename, ’lo_import’); Imports a Unix file as large object and returns the object id of the new object or undef upon failure. $ret = $dbh->func($lobjId, $filename, ’lo_export’); > > Thanks, > Ed -- Your PostgreSQL solutions company - Command Prompt, Inc. 1.800.492.2240 PostgreSQL Replication, Consulting, Custom Programming, 24x7 support Managed Services, Shared and Dedicated Hosting Co-Authors: plPHP, plPerlNG - http://www.commandprompt.com/
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