BaseMapper::findAllByName() - Code Metrics - Inspection of "Move Subsonic API converters to PodcastChannel and..." - owncloud/music - Measure and Improve Code Quality continuously with Scrutinizer

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by Pauli

created 2021-08-06 21:38 UTC

BaseMapper::findAllByName() A

↳ Parent: BaseMapper

Complexity

Conditions	4
Paths	6

Size

Total Lines	25
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	1

Metric	Value
cc	4
eloc	16
nc	6
nop	9
dl	0
loc	25
rs	9.7333
c	1
b	0
f	1

How to fix Many Parameters

<?php declare(strict_types=1);

/**
 * ownCloud - Music app
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Pauli Järvinen <[email protected]>
 * @copyright Pauli Järvinen 2016 - 2021
 */

namespace OCA\Music\Db;

use \OCP\AppFramework\Db\DoesNotExistException;
use \OCP\AppFramework\Db\Entity;
use \OCP\AppFramework\Db\Mapper;
use \OCP\AppFramework\Db\MultipleObjectsReturnedException;
use \OCP\IDBConnection;

use \OCA\Music\AppFramework\Db\UniqueConstraintViolationException;

/**
 * Common base class for data access classes of the Music app
 */
abstract class BaseMapper extends Mapper {
	const SQL_DATE_FORMAT = 'Y-m-d H:i:s.v';

	protected $nameColumn;

	public function __construct(IDBConnection $db, string $tableName, string $entityClass, string $nameColumn) {
		parent::__construct($db, $tableName, $entityClass);
		$this->nameColumn = $nameColumn;
	}

	/**
	 * Create an empty object of the entity class bound to this mapper
	 */
	public function createEntity() : Entity {
		return new $this->entityClass();
	}

	/**
	 * Find a single entity by id and user_id
	 * @throws DoesNotExistException if the entity does not exist
	 * @throws MultipleObjectsReturnedException if more than one entity exists
	 */
	public function find(int $id, string $userId) : Entity {
		$sql = $this->selectUserEntities("`{$this->getTableName()}`.`id` = ?");
		return $this->findEntity($sql, [$userId, $id]);
	}

	/**
	 * Find all entities matching the given IDs. Specifying the owning user is optional.
	 * @param integer[] $ids  IDs of the entities to be found
	 * @param string|null $userId
	 * @return Entity[]
	 */
	public function findById(array $ids, string $userId=null) : array {
		$count = \count($ids);
		$condition = "`{$this->getTableName()}`.`id` IN ". $this->questionMarks($count);

		if (empty($userId)) {
			$sql = $this->selectEntities($condition);
		} else {
			$sql = $this->selectUserEntities($condition);
			$ids = \array_merge([$userId], $ids);
		}

		return $this->findEntities($sql, $ids);
	}

	/**
	 * Find all user's entities
	 * @param string|null $createdMin Optional minimum `created` timestamp.
	 * @param string|null $createdMax Optional maximum `created` timestamp.
	 * @param string|null $updatedMin Optional minimum `updated` timestamp.
	 * @param string|null $updatedMax Optional maximum `updated` timestamp.
	 * @return Entity[]
	 */
	public function findAll(string $userId, int $sortBy=SortBy::None, int $limit=null, int $offset=null,
							?string $createdMin=null, ?string $createdMax=null, ?string $updatedMin=null, ?string $updatedMax=null) : array {
		if ($sortBy == SortBy::Name) {
			$sorting = "ORDER BY LOWER(`{$this->getTableName()}`.`{$this->nameColumn}`)";
		} elseif ($sortBy == SortBy::Newest) {
			$sorting = "ORDER BY `{$this->getTableName()}`.`id` DESC"; // abuse the fact that IDs are ever-incrementing values
		} else {
			$sorting = null;
		}
		[$condition, $params] = $this->formatTimestampConditions($createdMin, $createdMax, $updatedMin, $updatedMax);
		$sql = $this->selectUserEntities($condition, $sorting);
		\array_unshift($params, $userId);
		return $this->findEntities($sql, $params, $limit, $offset);
	}

	/**
	 * Find all user's entities matching the given name
	 * @param string|null $createdMin Optional minimum `created` timestamp.
	 * @param string|null $createdMax Optional maximum `created` timestamp.
	 * @param string|null $updatedMin Optional minimum `updated` timestamp.
	 * @param string|null $updatedMax Optional maximum `updated` timestamp.
	 * @return Entity[]
	 */
	public function findAllByName(
		?string $name, string $userId, bool $fuzzy=false, int $limit=null, int $offset=null,
		?string $createdMin=null, ?string $createdMax=null, ?string $updatedMin=null, ?string $updatedMax=null) : array {

		$nameCol = "`{$this->getTableName()}`.`{$this->nameColumn}`";
		if ($name === null) {
			$condition = "$nameCol IS NULL";
			$params = [$userId];
		} elseif ($fuzzy) {
			$condition = "LOWER($nameCol) LIKE LOWER(?)";
			$params = [$userId, "%$name%"];
		} else {
			$condition = "$nameCol = ?";
			$params = [$userId, $name];
		}

		[$timestampConds, $timestampParams] = $this->formatTimestampConditions($createdMin, $createdMax, $updatedMin, $updatedMax);
		if (!empty($timestampConds)) {
			$condition .= ' AND ' . $timestampConds;
			$params = \array_merge($params, $timestampParams);
		}

		$sql = $this->selectUserEntities($condition, "ORDER BY LOWER($nameCol)");

		return $this->findEntities($sql, $params, $limit, $offset);
	}

	/**
	 * Find all user's starred entities
	 * @return Entity[]
	 */
	public function findAllStarred(string $userId, int $limit=null, int $offset=null) : array {
		$sql = $this->selectUserEntities(
				"`{$this->getTableName()}`.`starred` IS NOT NULL",
				"ORDER BY LOWER(`{$this->getTableName()}`.`{$this->nameColumn}`)");
		return $this->findEntities($sql, [$userId], $limit, $offset);
	}

	/**
	 * Find IDs of all user's entities of this kind
	 * @return int[]
	 */
	public function findAllIds(string $userId) : array {
		$sql = "SELECT `id` FROM `{$this->getTableName()}` WHERE `user_id` = ?";
		$result = $this->execute($sql, [$userId]);

		return \array_map('intval', $result->fetchAll(\PDO::FETCH_COLUMN));
	}

	/**
	 * Delete all entities with given IDs without specifying the user
	 * @param integer[] $ids  IDs of the entities to be deleted
	 */
	public function deleteById(array $ids) : void {
		$count = \count($ids);
		if ($count === 0) {
			return;
		}
		$this->deleteByCond('`id` IN ' . $this->questionMarks($count), $ids);
	}

	/**
	 * Delete all entities matching the given SQL condition
	 * @param string $condition SQL 'WHERE' condition (without the keyword 'WHERE')
	 * @param array $params SQL parameters for the condition
	 */
	protected function deleteByCond(string $condition, array $params) : void {
		$sql = "DELETE FROM `{$this->getTableName()}` WHERE ". $condition;
		$this->execute($sql, $params);
	}

	/**
	 * Delete all entities of the given user
	 */
	public function deleteAll(string $userId) : void {
		$sql = "DELETE FROM `{$this->getTableName()}` WHERE `user_id` = ?";
		$this->execute($sql, [$userId]);
	}

	/**
	 * Tests if entity with given ID and user ID exists in the database
	 */
	public function exists(int $id, string $userId) : bool {
		$sql = "SELECT 1 FROM `{$this->getTableName()}` WHERE `id` = ? AND `user_id` = ?";
		$result = $this->execute($sql, [$id, $userId]);
		return $result->rowCount() > 0;
	}

	/**
	 * Count all entities of a user
	 */
	public function count(string $userId) : int {
		$sql = "SELECT COUNT(*) AS count FROM `{$this->getTableName()}` WHERE `user_id` = ?";
		$result = $this->execute($sql, [$userId]);
		$row = $result->fetch();
		return \intval($row['count']);
	}

	/**
	 * {@inheritDoc}
	 * @see \OCP\AppFramework\Db\Mapper::insert()
	 */
	public function insert(Entity $entity) : Entity {
		$now = new \DateTime();
		$nowStr = $now->format(self::SQL_DATE_FORMAT);
		$entity->setCreated($nowStr);
		$entity->setUpdated($nowStr);

		try {
			return parent::insert($entity);
		} catch (\Doctrine\DBAL\Exception\UniqueConstraintViolationException $e) {
			throw new UniqueConstraintViolationException($e->getMessage(), $e->getCode(), $e);
		} catch (\OCP\DB\Exception $e) {
filter:
    dependency_paths: ["lib/*"]
			// Nextcloud 21
			if ($e->getReason() == \OCP\DB\Exception::REASON_UNIQUE_CONSTRAINT_VIOLATION) {
				throw new UniqueConstraintViolationException($e->getMessage(), $e->getCode(), $e);
			} else {
				throw $e;
			}
		}
	}

	/**
	 * {@inheritDoc}
	 * @see \OCP\AppFramework\Db\Mapper::update()
	 */
	public function update(Entity $entity) : Entity {
		$now = new \DateTime();
		$entity->setUpdated($now->format(self::SQL_DATE_FORMAT));
		return parent::update($entity);
	}

	/**
	 * Insert an entity, or if an entity with the same identity already exists,
	 * update the existing entity.
	 * @return Entity The inserted or updated entity, containing also the id field
	 */
	public function insertOrUpdate(Entity $entity) : Entity {
		try {
			return $this->insert($entity);
		} catch (UniqueConstraintViolationException $ex) {
			$existingEntity = $this->findUniqueEntity($entity);
			$entity->setId($existingEntity->getId());
			$entity->setCreated($existingEntity->getCreated());
			return $this->update($entity);
		}
	}

	/**
	 * Set the "starred" column of the given entities
	 * @param \DateTime|null $date
	 * @param integer[] $ids
	 * @param string $userId
	 * @return int number of modified entities
	 */
	public function setStarredDate(?\DateTime $date, array $ids, string $userId) : int {
		$count = \count($ids);
		if (!empty($date)) {
			$date = $date->format(self::SQL_DATE_FORMAT);
		}

		$sql = "UPDATE `{$this->getTableName()}` SET `starred` = ?
				WHERE `id` IN {$this->questionMarks($count)} AND `user_id` = ?";
		$params = \array_merge([$date], $ids, [$userId]);
		return $this->execute($sql, $params)->rowCount();
	}

	public function latestInsertTime(string $userId) : ?\DateTime {
		$sql = "SELECT MAX(`{$this->getTableName()}`.`created`) FROM `{$this->getTableName()}` WHERE `user_id` = ?";
		$result = $this->execute($sql, [$userId]);
		$createdTime = $result->fetch(\PDO::FETCH_COLUMN);

		return ($createdTime === null) ? null : new \DateTime($createdTime);
	}

	public function latestUpdateTime(string $userId) : ?\DateTime {
		$sql = "SELECT MAX(`{$this->getTableName()}`.`updated`) FROM `{$this->getTableName()}` WHERE `user_id` = ?";
		$result = $this->execute($sql, [$userId]);
		$createdTime = $result->fetch(\PDO::FETCH_COLUMN);

		return ($createdTime === null) ? null : new \DateTime($createdTime);
	}

	/**
	 * helper creating a string like '(?,?,?)' with the specified number of elements
	 */
	protected function questionMarks(int $count) : string {
		$questionMarks = [];
		for ($i = 0; $i < $count; $i++) {
			$questionMarks[] = '?';
		}
		return '(' . \implode(',', $questionMarks) . ')';
	}

	/**
	 * Build a SQL SELECT statement which selects all entities of the given user,
	 * and optionally applies other conditions, too.
	 * This is built upon `selectEntities` which may be overridden by the derived class.
	 * @param string|null $condition Optional extra condition. This will get automatically
	 *                               prefixed with ' AND ', so don't include that.
	 * @param string|null $extension Any extension (e.g. ORDER BY, LIMIT) to be added after
	 *                               the conditions in the SQL statement
	 */
	protected function selectUserEntities(string $condition=null, string $extension=null) : string {
		$allConditions = "`{$this->getTableName()}`.`user_id` = ?";

		if (!empty($condition)) {
			$allConditions .= " AND $condition";
		}

		return $this->selectEntities($allConditions, $extension);
	}

	/**
	 * Build a SQL SELECT statement which selects all entities matching the given condition.
	 * The derived class may override this if necessary.
	 * @param string $condition This will get automatically prefixed with ' WHERE '
	 * @param string|null $extension Any extension (e.g. ORDER BY, LIMIT) to be added after
	 *                               the conditions in the SQL statement
	 */
	protected function selectEntities(string $condition, string $extension=null) : string {
		return "SELECT * FROM `{$this->getTableName()}` WHERE $condition $extension ";
	}

	/**
	 * @return array with two values: The SQL condition as string and the SQL parameters as string[]
	 */
	protected function formatTimestampConditions(?string $createdMin, ?string $createdMax, ?string $updatedMin, ?string $updatedMax) : array {
		$conditions = [];
		$params = [];
		
		if (!empty($createdMin)) {
			$conditions[] = "`{$this->getTableName()}`.`created` >= ?";
			$params[] = $createdMin;
		}
		
		if (!empty($createdMax)) {
			$conditions[] = "`{$this->getTableName()}`.`created` <= ?";
			$params[] = $createdMax;
		}
		
		if (!empty($updatedMin)) {
			$conditions[] = "`{$this->getTableName()}`.`updated` >= ?";
			$params[] = $updatedMin;
		}
		
		if (!empty($updatedMax)) {
			$conditions[] = "`{$this->getTableName()}`.`updated` <= ?";
			$params[] = $updatedMax;
		}
		
		return [\implode(' AND ', $conditions), $params];
	}

	/**
	 * Find an entity which has the same identity as the supplied entity.
	 * How the identity of the entity is defined, depends on the derived concrete class.
	 */
	abstract protected function findUniqueEntity(Entity $entity) : Entity;
}


1			<?php declare(strict_types=1);
2
3			/**
4			* ownCloud - Music app
5			*
6			* This file is licensed under the Affero General Public License version 3 or
7			* later. See the COPYING file.
8			*
9			* @author Pauli Järvinen <[email protected]>
10			* @copyright Pauli Järvinen 2016 - 2021
11			*/
12
13			namespace OCA\Music\Db;
14
15			use \OCP\AppFramework\Db\DoesNotExistException;
16			use \OCP\AppFramework\Db\Entity;
17			use \OCP\AppFramework\Db\Mapper;
18			use \OCP\AppFramework\Db\MultipleObjectsReturnedException;
19			use \OCP\IDBConnection;
20
21			use \OCA\Music\AppFramework\Db\UniqueConstraintViolationException;
22
23			/**
24			* Common base class for data access classes of the Music app
25			*/
26			abstract class BaseMapper extends Mapper {
27			const SQL_DATE_FORMAT = 'Y-m-d H:i:s.v';
28
29			protected $nameColumn;
30
31			public function __construct(IDBConnection $db, string $tableName, string $entityClass, string $nameColumn) {
32			parent::__construct($db, $tableName, $entityClass);
33			$this->nameColumn = $nameColumn;
34			}
35
36			/**
37			* Create an empty object of the entity class bound to this mapper
38			*/
39			public function createEntity() : Entity {
40			return new $this->entityClass();
41			}
42
43			/**
44			* Find a single entity by id and user_id
45			* @throws DoesNotExistException if the entity does not exist
46			* @throws MultipleObjectsReturnedException if more than one entity exists
47			*/
48			public function find(int $id, string $userId) : Entity {
49			$sql = $this->selectUserEntities("`{$this->getTableName()}`.`id` = ?");
50			return $this->findEntity($sql, [$userId, $id]);
51			}
52
53			/**
54			* Find all entities matching the given IDs. Specifying the owning user is optional.
55			* @param integer[] $ids IDs of the entities to be found
56			* @param string\|null $userId
57			* @return Entity[]
58			*/
59			public function findById(array $ids, string $userId=null) : array {
60			$count = \count($ids);
61			$condition = "`{$this->getTableName()}`.`id` IN ". $this->questionMarks($count);
62
63			if (empty($userId)) {
64			$sql = $this->selectEntities($condition);
65			} else {
66			$sql = $this->selectUserEntities($condition);
67			$ids = \array_merge([$userId], $ids);
68			}
69
70			return $this->findEntities($sql, $ids);
71			}
72
73			/**
74			* Find all user's entities
75			* @param string\|null $createdMin Optional minimum `created` timestamp.
76			* @param string\|null $createdMax Optional maximum `created` timestamp.
77			* @param string\|null $updatedMin Optional minimum `updated` timestamp.
78			* @param string\|null $updatedMax Optional maximum `updated` timestamp.
79			* @return Entity[]
80			*/
81			public function findAll(string $userId, int $sortBy=SortBy::None, int $limit=null, int $offset=null,
82			?string $createdMin=null, ?string $createdMax=null, ?string $updatedMin=null, ?string $updatedMax=null) : array {
83			if ($sortBy == SortBy::Name) {
84			$sorting = "ORDER BY LOWER(`{$this->getTableName()}`.`{$this->nameColumn}`)";
85			} elseif ($sortBy == SortBy::Newest) {
86			$sorting = "ORDER BY `{$this->getTableName()}`.`id` DESC"; // abuse the fact that IDs are ever-incrementing values
87			} else {
88			$sorting = null;
89			}
90			[$condition, $params] = $this->formatTimestampConditions($createdMin, $createdMax, $updatedMin, $updatedMax);
91			$sql = $this->selectUserEntities($condition, $sorting);
92			\array_unshift($params, $userId);
93			return $this->findEntities($sql, $params, $limit, $offset);
94			}
95
96			/**
97			* Find all user's entities matching the given name
98			* @param string\|null $createdMin Optional minimum `created` timestamp.
99			* @param string\|null $createdMax Optional maximum `created` timestamp.
100			* @param string\|null $updatedMin Optional minimum `updated` timestamp.
101			* @param string\|null $updatedMax Optional maximum `updated` timestamp.
102			* @return Entity[]
103			*/
104			public function findAllByName(
105			?string $name, string $userId, bool $fuzzy=false, int $limit=null, int $offset=null,
106			?string $createdMin=null, ?string $createdMax=null, ?string $updatedMin=null, ?string $updatedMax=null) : array {
107
108			$nameCol = "`{$this->getTableName()}`.`{$this->nameColumn}`";
109			if ($name === null) {
110			$condition = "$nameCol IS NULL";
111			$params = [$userId];
112			} elseif ($fuzzy) {
113			$condition = "LOWER($nameCol) LIKE LOWER(?)";
114			$params = [$userId, "%$name%"];
115			} else {
116			$condition = "$nameCol = ?";
117			$params = [$userId, $name];
118			}
119
120			[$timestampConds, $timestampParams] = $this->formatTimestampConditions($createdMin, $createdMax, $updatedMin, $updatedMax);
121			if (!empty($timestampConds)) {
122			$condition .= ' AND ' . $timestampConds;
123			$params = \array_merge($params, $timestampParams);
124			}
125
126			$sql = $this->selectUserEntities($condition, "ORDER BY LOWER($nameCol)");
127
128			return $this->findEntities($sql, $params, $limit, $offset);
129			}
130
131			/**
132			* Find all user's starred entities
133			* @return Entity[]
134			*/
135			public function findAllStarred(string $userId, int $limit=null, int $offset=null) : array {
136			$sql = $this->selectUserEntities(
137			"`{$this->getTableName()}`.`starred` IS NOT NULL",
138			"ORDER BY LOWER(`{$this->getTableName()}`.`{$this->nameColumn}`)");
139			return $this->findEntities($sql, [$userId], $limit, $offset);
140			}
141
142			/**
143			* Find IDs of all user's entities of this kind
144			* @return int[]
145			*/
146			public function findAllIds(string $userId) : array {
147			$sql = "SELECT `id` FROM `{$this->getTableName()}` WHERE `user_id` = ?";
148			$result = $this->execute($sql, [$userId]);
149
150			return \array_map('intval', $result->fetchAll(\PDO::FETCH_COLUMN));
151			}
152
153			/**
154			* Delete all entities with given IDs without specifying the user
155			* @param integer[] $ids IDs of the entities to be deleted
156			*/
157			public function deleteById(array $ids) : void {
158			$count = \count($ids);
159			if ($count === 0) {
160			return;
161			}
162			$this->deleteByCond('`id` IN ' . $this->questionMarks($count), $ids);
163			}
164
165			/**
166			* Delete all entities matching the given SQL condition
167			* @param string $condition SQL 'WHERE' condition (without the keyword 'WHERE')
168			* @param array $params SQL parameters for the condition
169			*/
170			protected function deleteByCond(string $condition, array $params) : void {
171			$sql = "DELETE FROM `{$this->getTableName()}` WHERE ". $condition;
172			$this->execute($sql, $params);
173			}
174
175			/**
176			* Delete all entities of the given user
177			*/
178			public function deleteAll(string $userId) : void {
179			$sql = "DELETE FROM `{$this->getTableName()}` WHERE `user_id` = ?";
180			$this->execute($sql, [$userId]);
181			}
182
183			/**
184			* Tests if entity with given ID and user ID exists in the database
185			*/
186			public function exists(int $id, string $userId) : bool {
187			$sql = "SELECT 1 FROM `{$this->getTableName()}` WHERE `id` = ? AND `user_id` = ?";
188			$result = $this->execute($sql, [$id, $userId]);
189			return $result->rowCount() > 0;
190			}
191
192			/**
193			* Count all entities of a user
194			*/
195			public function count(string $userId) : int {
196			$sql = "SELECT COUNT(*) AS count FROM `{$this->getTableName()}` WHERE `user_id` = ?";
197			$result = $this->execute($sql, [$userId]);
198			$row = $result->fetch();
199			return \intval($row['count']);
200			}
201
202			/**
203			* {@inheritDoc}
204			* @see \OCP\AppFramework\Db\Mapper::insert()
205			*/
206			public function insert(Entity $entity) : Entity {
207			$now = new \DateTime();
208			$nowStr = $now->format(self::SQL_DATE_FORMAT);
209			$entity->setCreated($nowStr);
210			$entity->setUpdated($nowStr);
211
212			try {
213			return parent::insert($entity);
214			} catch (\Doctrine\DBAL\Exception\UniqueConstraintViolationException $e) {
215			throw new UniqueConstraintViolationException($e->getMessage(), $e->getCode(), $e);
216			} catch (\OCP\DB\Exception $e) {
			0 ignored issues – show Bug introduced 2021-02-27 17:05 UTC by Report Bug Copy Issue Report The type `OCP\DB\Exception` was not found. Maybe you did not declare it correctly or list all dependencies? The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g. `excluded_paths: ["lib/"]`, you can move it to the dependency path list as follows: filter: dependency_paths: ["lib/"] For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths Loading history...
217			// Nextcloud 21
218			if ($e->getReason() == \OCP\DB\Exception::REASON_UNIQUE_CONSTRAINT_VIOLATION) {
219			throw new UniqueConstraintViolationException($e->getMessage(), $e->getCode(), $e);
220			} else {
221			throw $e;
222			}
223			}
224			}
225
226			/**
227			* {@inheritDoc}
228			* @see \OCP\AppFramework\Db\Mapper::update()
229			*/
230			public function update(Entity $entity) : Entity {
231			$now = new \DateTime();
232			$entity->setUpdated($now->format(self::SQL_DATE_FORMAT));
233			return parent::update($entity);
234			}
235
236			/**
237			* Insert an entity, or if an entity with the same identity already exists,
238			* update the existing entity.
239			* @return Entity The inserted or updated entity, containing also the id field
240			*/
241			public function insertOrUpdate(Entity $entity) : Entity {
242			try {
243			return $this->insert($entity);
244			} catch (UniqueConstraintViolationException $ex) {
245			$existingEntity = $this->findUniqueEntity($entity);
246			$entity->setId($existingEntity->getId());
247			$entity->setCreated($existingEntity->getCreated());
248			return $this->update($entity);
249			}
250			}
251
252			/**
253			* Set the "starred" column of the given entities
254			* @param \DateTime\|null $date
255			* @param integer[] $ids
256			* @param string $userId
257			* @return int number of modified entities
258			*/
259			public function setStarredDate(?\DateTime $date, array $ids, string $userId) : int {
260			$count = \count($ids);
261			if (!empty($date)) {
262			$date = $date->format(self::SQL_DATE_FORMAT);
263			}
264
265			$sql = "UPDATE `{$this->getTableName()}` SET `starred` = ?
266			WHERE `id` IN {$this->questionMarks($count)} AND `user_id` = ?";
267			$params = \array_merge([$date], $ids, [$userId]);
268			return $this->execute($sql, $params)->rowCount();
269			}
270
271			public function latestInsertTime(string $userId) : ?\DateTime {
272			$sql = "SELECT MAX(`{$this->getTableName()}`.`created`) FROM `{$this->getTableName()}` WHERE `user_id` = ?";
273			$result = $this->execute($sql, [$userId]);
274			$createdTime = $result->fetch(\PDO::FETCH_COLUMN);
275
276			return ($createdTime === null) ? null : new \DateTime($createdTime);
277			}
278
279			public function latestUpdateTime(string $userId) : ?\DateTime {
280			$sql = "SELECT MAX(`{$this->getTableName()}`.`updated`) FROM `{$this->getTableName()}` WHERE `user_id` = ?";
281			$result = $this->execute($sql, [$userId]);
282			$createdTime = $result->fetch(\PDO::FETCH_COLUMN);
283
284			return ($createdTime === null) ? null : new \DateTime($createdTime);
285			}
286
287			/**
288			* helper creating a string like '(?,?,?)' with the specified number of elements
289			*/
290			protected function questionMarks(int $count) : string {
291			$questionMarks = [];
292			for ($i = 0; $i < $count; $i++) {
293			$questionMarks[] = '?';
294			}
295			return '(' . \implode(',', $questionMarks) . ')';
296			}
297
298			/**
299			* Build a SQL SELECT statement which selects all entities of the given user,
300			* and optionally applies other conditions, too.
301			* This is built upon `selectEntities` which may be overridden by the derived class.
302			* @param string\|null $condition Optional extra condition. This will get automatically
303			* prefixed with ' AND ', so don't include that.
304			* @param string\|null $extension Any extension (e.g. ORDER BY, LIMIT) to be added after
305			* the conditions in the SQL statement
306			*/
307			protected function selectUserEntities(string $condition=null, string $extension=null) : string {
308			$allConditions = "`{$this->getTableName()}`.`user_id` = ?";
309
310			if (!empty($condition)) {
311			$allConditions .= " AND $condition";
312			}
313
314			return $this->selectEntities($allConditions, $extension);
315			}
316
317			/**
318			* Build a SQL SELECT statement which selects all entities matching the given condition.
319			* The derived class may override this if necessary.
320			* @param string $condition This will get automatically prefixed with ' WHERE '
321			* @param string\|null $extension Any extension (e.g. ORDER BY, LIMIT) to be added after
322			* the conditions in the SQL statement
323			*/
324			protected function selectEntities(string $condition, string $extension=null) : string {
325			return "SELECT * FROM `{$this->getTableName()}` WHERE $condition $extension ";
326			}
327
328			/**
329			* @return array with two values: The SQL condition as string and the SQL parameters as string[]
330			*/
331			protected function formatTimestampConditions(?string $createdMin, ?string $createdMax, ?string $updatedMin, ?string $updatedMax) : array {
332			$conditions = [];
333			$params = [];
334
335			if (!empty($createdMin)) {
336			$conditions[] = "`{$this->getTableName()}`.`created` >= ?";
337			$params[] = $createdMin;
338			}
339
340			if (!empty($createdMax)) {
341			$conditions[] = "`{$this->getTableName()}`.`created` <= ?";
342			$params[] = $createdMax;
343			}
344
345			if (!empty($updatedMin)) {
346			$conditions[] = "`{$this->getTableName()}`.`updated` >= ?";
347			$params[] = $updatedMin;
348			}
349
350			if (!empty($updatedMax)) {
351			$conditions[] = "`{$this->getTableName()}`.`updated` <= ?";
352			$params[] = $updatedMax;
353			}
354
355			return [\implode(' AND ', $conditions), $params];
356			}
357
358			/**
359			* Find an entity which has the same identity as the supplied entity.
360			* How the identity of the entity is defined, depends on the derived concrete class.
361			*/
362			abstract protected function findUniqueEntity(Entity $entity) : Entity;
363			}
364

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