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07ec659385
This project lived only on the server without version control. This is now the starting point for the repository.
122 lines
3.2 KiB
PHP
122 lines
3.2 KiB
PHP
<?php
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/*
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Question2Answer by Gideon Greenspan and contributors
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http://www.question2answer.org/
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Description: Database-level access to blobs table for large chunks of data (e.g. images)
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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More about this license: http://www.question2answer.org/license.php
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*/
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if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
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header('Location: ../../');
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exit;
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}
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/**
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* Create a new blob in the database with $content and $format, other fields as provided
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* @param $content
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* @param $format
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* @param $sourcefilename
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* @param $userid
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* @param $cookieid
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* @param $ip
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* @return mixed|null|string
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*/
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function qa_db_blob_create($content, $format, $sourcefilename = null, $userid = null, $cookieid = null, $ip = null)
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{
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if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
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for ($attempt = 0; $attempt < 10; $attempt++) {
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$blobid = qa_db_random_bigint();
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if (qa_db_blob_exists($blobid))
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continue;
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qa_db_query_sub(
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'INSERT INTO ^blobs (blobid, format, content, filename, userid, cookieid, createip, created) VALUES (#, $, $, $, $, #, UNHEX($), NOW())',
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$blobid, $format, $content, $sourcefilename, $userid, $cookieid, bin2hex(@inet_pton($ip))
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);
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return $blobid;
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}
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return null;
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}
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/**
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* Get the information about blob $blobid from the database
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* @param $blobid
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* @return array|mixed|null
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*/
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function qa_db_blob_read($blobid)
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{
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if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
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return qa_db_read_one_assoc(qa_db_query_sub(
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'SELECT content, format, filename FROM ^blobs WHERE blobid=#',
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$blobid
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), true);
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}
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/**
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* Change the content of blob $blobid in the database to $content (can also be null)
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* @param $blobid
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* @param $content
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*/
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function qa_db_blob_set_content($blobid, $content)
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{
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qa_db_query_sub(
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'UPDATE ^blobs SET content=$ WHERE blobid=#',
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$content, $blobid
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);
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}
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/**
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* Delete blob $blobid in the database
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* @param $blobid
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* @return mixed
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*/
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function qa_db_blob_delete($blobid)
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{
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if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
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qa_db_query_sub(
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'DELETE FROM ^blobs WHERE blobid=#',
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$blobid
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);
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}
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/**
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* Check if blob $blobid exists in the database
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* @param $blobid
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* @return bool|mixed
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*/
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function qa_db_blob_exists($blobid)
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{
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if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
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$blob = qa_db_read_one_value(qa_db_query_sub(
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'SELECT COUNT(*) FROM ^blobs WHERE blobid=#',
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$blobid
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));
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return $blob > 0;
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}
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