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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Database-level access to blobs table for large chunks of data (e.g. images)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../../');
exit;
}
/**
* Create a new blob in the database with $content and $format, other fields as provided
* @param $content
* @param $format
* @param $sourcefilename
* @param $userid
* @param $cookieid
* @param $ip
* @return mixed|null|string
*/
function qa_db_blob_create($content, $format, $sourcefilename = null, $userid = null, $cookieid = null, $ip = null)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
for ($attempt = 0; $attempt < 10; $attempt++) {
$blobid = qa_db_random_bigint();
if (qa_db_blob_exists($blobid))
continue;
qa_db_query_sub(
'INSERT INTO ^blobs (blobid, format, content, filename, userid, cookieid, createip, created) VALUES (#, $, $, $, $, #, UNHEX($), NOW())',
$blobid, $format, $content, $sourcefilename, $userid, $cookieid, bin2hex(@inet_pton($ip))
);
return $blobid;
}
return null;
}
/**
* Get the information about blob $blobid from the database
* @param $blobid
* @return array|mixed|null
*/
function qa_db_blob_read($blobid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
return qa_db_read_one_assoc(qa_db_query_sub(
'SELECT content, format, filename FROM ^blobs WHERE blobid=#',
$blobid
), true);
}
/**
* Change the content of blob $blobid in the database to $content (can also be null)
* @param $blobid
* @param $content
*/
function qa_db_blob_set_content($blobid, $content)
{
qa_db_query_sub(
'UPDATE ^blobs SET content=$ WHERE blobid=#',
$content, $blobid
);
}
/**
* Delete blob $blobid in the database
* @param $blobid
* @return mixed
*/
function qa_db_blob_delete($blobid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
qa_db_query_sub(
'DELETE FROM ^blobs WHERE blobid=#',
$blobid
);
}
/**
* Check if blob $blobid exists in the database
* @param $blobid
* @return bool|mixed
*/
function qa_db_blob_exists($blobid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
$blob = qa_db_read_one_value(qa_db_query_sub(
'SELECT COUNT(*) FROM ^blobs WHERE blobid=#',
$blobid
));
return $blob > 0;
}