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<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Migration_deduplicate_file_storage extends CI_Migration {
public function up()
{
$prefix = $this->db->dbprefix;
if ($this->db->dbdriver == 'postgre') {
throw new \exceptions\ApiException("migration/postgres/not-implemented", "migration 14 not yet implemented for postgres");
} else {
$this->db->query('
CREATE TABLE `'.$prefix.'file_storage` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`filesize` int(11) NOT NULL,
`mimetype` varchar(255) NOT NULL,
`hash` char(32) NOT NULL,
`date` int(11) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `data_id` (`id`, `hash`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
');
$this->db->query('
ALTER TABLE `'.$prefix.'files`
ADD `file_storage_id` INT NOT NULL,
ADD INDEX (`file_storage_id`);
');
$this->db->query('
INSERT INTO `'.$prefix.'file_storage` (id, filesize, mimetype, hash, date)
SELECT NULL, filesize, mimetype, hash, date FROM `'.$prefix.'files`;
');
$this->db->query('
UPDATE `'.$prefix.'files` f
JOIN `'.$prefix.'file_storage` fs ON fs.hash = f.hash
SET f.file_storage_id = fs.id
');
// XXX: This query also exists in migration 15
$this->db->query('
DELETE file_storage
FROM file_storage
LEFT OUTER JOIN files ON files.file_storage_id = file_storage.id
WHERE file_storage.id NOT IN (
SELECT min(x.id)
FROM (
SELECT fs.id, fs.hash
FROM file_storage fs
) x
GROUP BY x.hash
)
AND files.id IS NULL
');
$chunk = 500;
$total = $this->db->count_all("file_storage");
for ($limit = 0; $limit < $total; $limit += $chunk) {
$query = $this->db->select('hash, id')
->from('file_storage')
->limit($chunk, $limit)
->get()->result_array();
foreach ($query as $key => $item) {
$old = $this->mfile->file($item["hash"]);
$data_id = $item["hash"].'-'.$item["id"];
$new = $this->mfile->file($data_id);
if (file_exists($old)) {
rename($old, $new);
} else {
echo "Warning: no file found for $data_id. Skipping...\n";
}
}
}
$this->db->query('
ALTER TABLE `'.$prefix.'files`
ADD FOREIGN KEY (`file_storage_id`) REFERENCES `'.$prefix.'file_storage`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
');
$this->dbforge->drop_column("files", "hash");
$this->dbforge->drop_column("files", "mimetype");
$this->dbforge->drop_column("files", "filesize");
}
}
public function down()
{
throw new \exceptions\ApiException("migration/downgrade-not-supported", "downgrade not supported");
}
}
|
