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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Bart Visscher <bartv@thisnet.nl>
* @author Joas Schilling <coding@schilljs.com>
* @author Jonny007-MKD <1-23-4-5@web.de>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\DB;
/**
* This handles the way we use to write queries, into something that can be
* handled by the database abstraction layer.
*/
class Adapter {
/**
* @var \OC\DB\Connection $conn
*/
protected $conn;
public function __construct($conn) {
$this->conn = $conn;
}
/**
* @param string $table name
* @return int id of last insert statement
*/
public function lastInsertId($table) {
return $this->conn->realLastInsertId($table);
}
/**
* @param string $statement that needs to be changed so the db can handle it
* @return string changed statement
*/
public function fixupStatement($statement) {
return $statement;
}
/**
* Create an exclusive read+write lock on a table
*
* @param string $tableName
* @since 9.1.0
*/
public function lockTable($tableName) {
$this->conn->beginTransaction();
$this->conn->executeUpdate('LOCK TABLE `' .$tableName . '` IN EXCLUSIVE MODE');
}
/**
* Release a previous acquired lock again
*
* @since 9.1.0
*/
public function unlockTable() {
$this->conn->commit();
}
/**
* Insert a row if the matching row does not exists.
*
* @param string $table The table name (will replace *PREFIX* with the actual prefix)
* @param array $input data that should be inserted into the table (column name => value)
* @param array|null $compare List of values that should be checked for "if not exists"
* If this is null or an empty array, all keys of $input will be compared
* Please note: text fields (clob) must not be used in the compare array
* @return int number of inserted rows
* @throws \Doctrine\DBAL\DBALException
*/
public function insertIfNotExist($table, $input, array $compare = null) {
if (empty($compare)) {
$compare = array_keys($input);
}
$query = 'INSERT INTO `' .$table . '` (`'
. implode('`,`', array_keys($input)) . '`) SELECT '
. str_repeat('?,', count($input)-1).'? ' // Is there a prettier alternative?
. 'FROM `' . $table . '` WHERE ';
$inserts = array_values($input);
foreach($compare as $key) {
$query .= '`' . $key . '`';
if (is_null($input[$key])) {
$query .= ' IS NULL AND ';
} else {
$inserts[] = $input[$key];
$query .= ' = ? AND ';
}
}
$query = substr($query, 0, strlen($query) - 5);
$query .= ' HAVING COUNT(*) = 0';
return $this->conn->executeUpdate($query, $inserts);
}
}