<?php /* Question2Answer by Gideon Greenspan and contributors http://www.question2answer.org/ File: qa-include/qa-db-blobs.php Version: See define()s at top of qa-include/qa-base.php 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; } function qa_db_blob_create($content, $format, $sourcefilename=null, $userid=null, $cookieid=null, $ip=null) /* Create a new blob in the database with $content and $format, other fields as provided */ { 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 (#, $, $, $, $, #, INET_ATON($), NOW())', $blobid, $format, $content, $sourcefilename, $userid, $cookieid, $ip ); return $blobid; } return null; } function qa_db_blob_read($blobid) /* Get the information about blob $blobid from the database */ { 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=#', $blobid ), true); } function qa_db_blob_set_content($blobid, $content) /* Change the content of blob $blobid in the database to $content (can also be null) */ { qa_db_query_sub( 'UPDATE ^blobs SET content=$ WHERE blobid=#', $content, $blobid ); } function qa_db_blob_delete($blobid) /* Delete blob $blobid in the database */ { if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); } qa_db_query_sub( 'DELETE FROM ^blobs WHERE blobid=#', $blobid ); } function qa_db_blob_exists($blobid) /* Check if blob $blobid exists in the database */ { if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); } return qa_db_read_one_value(qa_db_query_sub( 'SELECT COUNT(*) FROM ^blobs WHERE blobid=#', $blobid )) > 0; } /* Omit PHP closing tag to help avoid accidental output */