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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\DB;
use Doctrine\DBAL\Exception\UniqueConstraintViolationException;
class AdapterSqlite extends Adapter {
/**
* @param string $tableName
*/
public function lockTable($tableName) {
$this->conn->executeUpdate('BEGIN EXCLUSIVE TRANSACTION');
}
public function unlockTable() {
$this->conn->executeUpdate('COMMIT TRANSACTION');
}
public function fixupStatement($statement) {
$statement = preg_replace('/`(\w+)` ILIKE \?/', 'LOWER($1) LIKE LOWER(?)', $statement);
$statement = str_replace('`', '"', $statement);
$statement = str_ireplace('NOW()', 'datetime(\'now\')', $statement);
$statement = str_ireplace('GREATEST(', 'MAX(', $statement);
$statement = str_ireplace('UNIX_TIMESTAMP()', 'strftime(\'%s\',\'now\')', $statement);
return $statement;
}
/**
* Insert a row if the matching row does not exists. To accomplish proper race condition avoidance
* it is needed that there is also a unique constraint on the values. Then this method will
* catch the exception and return 0.
*
* @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\Exception
* @deprecated 15.0.0 - use unique index and "try { $db->insert() } catch (UniqueConstraintViolationException $e) {}" instead, because it is more reliable and does not have the risk for deadlocks - see https://github.com/nextcloud/server/pull/12371
*/
public function insertIfNotExist($table, $input, ?array $compare = null) {
if (empty($compare)) {
$compare = array_keys($input);
}
$fieldList = '`' . implode('`,`', array_keys($input)) . '`';
$query = "INSERT INTO `$table` ($fieldList) SELECT "
. str_repeat('?,', count($input) - 1) . '? '
. " WHERE NOT EXISTS (SELECT 1 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, -5);
$query .= ')';
try {
return $this->conn->executeUpdate($query, $inserts);
} catch (UniqueConstraintViolationException $e) {
// if this is thrown then a concurrent insert happened between the insert and the sub-select in the insert, that should have avoided it
// it's fine to ignore this then
//
// more discussions about this can be found at https://github.com/nextcloud/server/pull/12315
return 0;
}
}
public function insertIgnoreConflict(string $table, array $values): int {
$builder = $this->conn->getQueryBuilder();
$builder->insert($table);
$updates = [];
foreach ($values as $key => $value) {
$builder->setValue($key, $builder->createNamedParameter($value));
}
return $this->conn->executeStatement(
$builder->getSQL() . ' ON CONFLICT DO NOTHING',
$builder->getParameters(),
$builder->getParameterTypes()
);
}
}
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