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<?php |
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/** |
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* @copyright Copyright (c) 2016, ownCloud, Inc. |
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* |
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* @author Bart Visscher <[email protected]> |
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* @author Joas Schilling <[email protected]> |
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* @author Jonny007-MKD <[email protected]> |
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* @author Morris Jobke <[email protected]> |
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* @author Robin Appelman <[email protected]> |
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* @author Thomas Müller <[email protected]> |
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* |
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* @license AGPL-3.0 |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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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 Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OC\DB; |
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use Doctrine\DBAL\Exception\UniqueConstraintViolationException; |
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/** |
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* This handles the way we use to write queries, into something that can be |
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* handled by the database abstraction layer. |
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*/ |
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class Adapter { |
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/** |
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* @var \OC\DB\Connection $conn |
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*/ |
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protected $conn; |
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public function __construct($conn) { |
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$this->conn = $conn; |
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} |
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/** |
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* @param string $table name |
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* @return int id of last insert statement |
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*/ |
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public function lastInsertId($table) { |
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return $this->conn->realLastInsertId($table); |
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} |
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/** |
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* @param string $statement that needs to be changed so the db can handle it |
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* @return string changed statement |
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*/ |
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public function fixupStatement($statement) { |
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return $statement; |
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} |
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/** |
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* Create an exclusive read+write lock on a table |
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* |
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* @param string $tableName |
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* @since 9.1.0 |
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*/ |
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public function lockTable($tableName) { |
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$this->conn->beginTransaction(); |
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$this->conn->executeUpdate('LOCK TABLE `' .$tableName . '` IN EXCLUSIVE MODE'); |
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} |
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/** |
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* Release a previous acquired lock again |
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* |
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* @since 9.1.0 |
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*/ |
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public function unlockTable() { |
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$this->conn->commit(); |
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} |
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/** |
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* Insert a row if the matching row does not exists. To accomplish proper race condition avoidance |
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* it is needed that there is also a unique constraint on the values. Then this method will |
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* catch the exception and return 0. |
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* |
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* @param string $table The table name (will replace *PREFIX* with the actual prefix) |
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* @param array $input data that should be inserted into the table (column name => value) |
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* @param array|null $compare List of values that should be checked for "if not exists" |
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* If this is null or an empty array, all keys of $input will be compared |
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* Please note: text fields (clob) must not be used in the compare array |
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* @return int number of inserted rows |
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* @throws \Doctrine\DBAL\DBALException |
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* @deprecated 15.0.0 - use unique index and "try { $db->insert() } catch (UniqueConstraintViolationException $e) {}" instead, because it is more reliable and does not have the risk for deadlocks - see https://github.com/nextcloud/server/pull/12371 |
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*/ |
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public function insertIfNotExist($table, $input, array $compare = null) { |
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if (empty($compare)) { |
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$compare = array_keys($input); |
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} |
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$query = 'INSERT INTO `' .$table . '` (`' |
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. implode('`,`', array_keys($input)) . '`) SELECT ' |
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. str_repeat('?,', count($input)-1).'? ' // Is there a prettier alternative? |
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. 'FROM `' . $table . '` WHERE '; |
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$inserts = array_values($input); |
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foreach($compare as $key) { |
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$query .= '`' . $key . '`'; |
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if (is_null($input[$key])) { |
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$query .= ' IS NULL AND '; |
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} else { |
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$inserts[] = $input[$key]; |
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$query .= ' = ? AND '; |
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} |
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} |
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$query = substr($query, 0, -5); |
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$query .= ' HAVING COUNT(*) = 0'; |
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try { |
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return $this->conn->executeUpdate($query, $inserts); |
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} catch (UniqueConstraintViolationException $e) { |
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// if this is thrown then a concurrent insert happened between the insert and the sub-select in the insert, that should have avoided it |
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// it's fine to ignore this then |
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// |
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// more discussions about this can be found at https://github.com/nextcloud/server/pull/12315 |
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return 0; |
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} |
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} |
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/** |
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* @suppress SqlInjectionChecker |
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*/ |
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public function insertIgnoreConflict(string $table,array $values) : int { |
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try { |
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$builder = $this->conn->getQueryBuilder(); |
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$builder->insert($table); |
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foreach($values as $key => $value) { |
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$builder->setValue($key, $builder->createNamedParameter($value)); |
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} |
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return $builder->execute(); |
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} catch(UniqueConstraintViolationException $e) { |
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return 0; |
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} |
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} |
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} |
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nextcloud /
server
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