4 * StatusNet, the distributed open-source microblogging tool
6 * Database schema utilities
10 * LICENCE: This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU Affero General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Affero General Public License for more details.
20 * You should have received a copy of the GNU Affero General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
25 * @author Evan Prodromou <evan@status.net>
26 * @copyright 2009 StatusNet, Inc.
27 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
28 * @link http://status.net/
31 if (!defined('STATUSNET')) {
37 public function __construct($schema)
39 $this->schema = $schema;
41 $this->checksums = $this->getChecksums();
45 * @param array $tableDefs
46 * @fixme handle tables that belong on different database servers...?
48 public function checkTables(array $tableDefs)
50 $checksums = $this->checksums;
51 foreach ($tableDefs as $table => $def) {
52 $checksum = $this->tableChecksum($def);
53 if (empty($checksums[$table])) {
54 common_log(LOG_DEBUG, "No previous schema_version for $table: updating to $checksum");
55 } else if ($checksums[$table] == $checksum) {
56 common_log(LOG_DEBUG, "Last schema_version for $table up to date: $checksum");
59 common_log(LOG_DEBUG, "Last schema_version for $table is {$checksums[$table]}: updating to $checksum");
61 $this->conn->query('BEGIN');
62 $this->schema->ensureTable($table, $def);
63 $this->saveChecksum($table, $checksum);
64 $this->conn->commit();
69 * Calculate a checksum for this table definition array.
74 public function checksum(array $def)
76 $flat = serialize($def);
81 * Pull all known table checksums into an array for easy lookup.
83 * @return array: associative array of table names to checksum strings
85 protected function getChecksums()
89 $sv = new Schema_version();
91 while ($sv->fetch()) {
92 $checksums[$sv->table_name] = $sv->checksum;
99 * Save or update current available checksums.
101 * @param string $table
102 * @param string $checksum
104 protected function saveChecksum($table, $checksum)
106 $sv = new Schema_version();
107 $sv->table_name = $table;
108 $sv->checksum = $checksum;
109 $sv->modified = common_sql_now();
110 if (isset($this->checksums[$table])) {
115 $this->checksums[$table] = $checksum;