272 lines
6.9 KiB
PHP
272 lines
6.9 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright 2018, Roeland Jago Douma <roeland@famdouma.nl>
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*
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program 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 as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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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
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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 OCP\AppFramework\Db;
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use OCP\DB\QueryBuilder\IQueryBuilder;
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use OCP\IDBConnection;
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/**
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* Simple parent class for inheriting your data access layer from. This class
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* may be subject to change in the future
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*
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* @since 14.0.0
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*/
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abstract class QBMapper {
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/** @var string */
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protected $tableName;
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/** @var string */
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protected $entityClass;
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/** @var IDBConnection */
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protected $db;
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/**
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* @param IDBConnection $db Instance of the Db abstraction layer
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* @param string $tableName the name of the table. set this to allow entity
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* @param string $entityClass the name of the entity that the sql should be
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* mapped to queries without using sql
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* @since 14.0.0
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*/
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public function __construct(IDBConnection $db, string $tableName, string $entityClass=null){
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$this->db = $db;
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$this->tableName = $tableName;
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// if not given set the entity name to the class without the mapper part
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// cache it here for later use since reflection is slow
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if($entityClass === null) {
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$this->entityClass = str_replace('Mapper', '', \get_class($this));
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} else {
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$this->entityClass = $entityClass;
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}
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}
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/**
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* @return string the table name
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* @since 14.0.0
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*/
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public function getTableName(): string {
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return $this->tableName;
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}
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/**
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* Deletes an entity from the table
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* @param Entity $entity the entity that should be deleted
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* @return Entity the deleted entity
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* @since 14.0.0
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*/
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public function delete(Entity $entity): Entity {
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$qb = $this->db->getQueryBuilder();
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$qb->delete($this->tableName)
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->where(
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$qb->expr()->eq('id', $qb->createNamedParameter($entity->getId()))
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);
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$qb->execute();
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return $entity;
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}
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/**
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* Creates a new entry in the db from an entity
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* @param Entity $entity the entity that should be created
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* @return Entity the saved entity with the set id
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* @since 14.0.0
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* @suppress SqlInjectionChecker
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*/
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public function insert(Entity $entity): Entity {
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// get updated fields to save, fields have to be set using a setter to
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// be saved
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$properties = $entity->getUpdatedFields();
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$qb = $this->db->getQueryBuilder();
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$qb->insert($this->tableName);
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// build the fields
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foreach($properties as $property => $updated) {
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$column = $entity->propertyToColumn($property);
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$getter = 'get' . ucfirst($property);
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$value = $entity->$getter();
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$qb->setValue($column, $qb->createNamedParameter($value));
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}
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$qb->execute();
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$entity->setId((int) $qb->getLastInsertId());
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return $entity;
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}
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/**
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* Updates an entry in the db from an entity
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* @throws \InvalidArgumentException if entity has no id
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* @param Entity $entity the entity that should be created
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* @return Entity the saved entity with the set id
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* @since 14.0.0
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* @suppress SqlInjectionChecker
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*/
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public function update(Entity $entity): Entity {
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// if entity wasn't changed it makes no sense to run a db query
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$properties = $entity->getUpdatedFields();
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if(\count($properties) === 0) {
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return $entity;
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}
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// entity needs an id
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$id = $entity->getId();
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if($id === null){
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throw new \InvalidArgumentException(
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'Entity which should be updated has no id');
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}
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// get updated fields to save, fields have to be set using a setter to
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// be saved
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// do not update the id field
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unset($properties['id']);
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$qb = $this->db->getQueryBuilder();
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$qb->update($this->tableName);
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// build the fields
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foreach($properties as $property => $updated) {
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$column = $entity->propertyToColumn($property);
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$getter = 'get' . ucfirst($property);
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$value = $entity->$getter();
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$qb->set($column, $qb->createNamedParameter($value));
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}
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$qb->where(
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$qb->expr()->eq('id', $qb->createNamedParameter($id))
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);
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$qb->execute();
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return $entity;
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}
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/**
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* Returns an db result and throws exceptions when there are more or less
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* results
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*
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* @see findEntity
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*
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* @param IQueryBuilder $query
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* @throws DoesNotExistException if the item does not exist
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* @throws MultipleObjectsReturnedException if more than one item exist
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* @return array the result as row
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* @since 14.0.0
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*/
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protected function findOneQuery(IQueryBuilder $query): array {
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$cursor = $query->execute();
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$row = $cursor->fetch();
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if($row === false) {
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$cursor->closeCursor();
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$msg = $this->buildDebugMessage(
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'Did expect one result but found none when executing', $query
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);
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throw new DoesNotExistException($msg);
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}
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$row2 = $cursor->fetch();
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$cursor->closeCursor();
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if($row2 !== false ) {
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$msg = $this->buildDebugMessage(
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'Did not expect more than one result when executing', $query
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);
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throw new MultipleObjectsReturnedException($msg);
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}
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return $row;
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}
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/**
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* @param string $msg
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* @param IQueryBuilder $sql
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* @return string
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* @since 14.0.0
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*/
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private function buildDebugMessage(string $msg, IQueryBuilder $sql): string {
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return $msg .
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': query "' . $sql->getSQL() . '"; ';
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}
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/**
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* Creates an entity from a row. Automatically determines the entity class
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* from the current mapper name (MyEntityMapper -> MyEntity)
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*
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* @param array $row the row which should be converted to an entity
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* @return Entity the entity
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* @since 14.0.0
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*/
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protected function mapRowToEntity(array $row): Entity {
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return \call_user_func($this->entityClass .'::fromRow', $row);
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}
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/**
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* Runs a sql query and returns an array of entities
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*
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* @param IQueryBuilder $query
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* @return Entity[] all fetched entities
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* @since 14.0.0
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*/
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protected function findEntities(IQueryBuilder $query): array {
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$cursor = $query->execute();
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$entities = [];
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while($row = $cursor->fetch()){
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$entities[] = $this->mapRowToEntity($row);
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}
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$cursor->closeCursor();
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return $entities;
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}
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/**
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* Returns an db result and throws exceptions when there are more or less
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* results
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*
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* @param IQueryBuilder $query
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* @throws DoesNotExistException if the item does not exist
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* @throws MultipleObjectsReturnedException if more than one item exist
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* @return Entity the entity
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* @since 14.0.0
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*/
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protected function findEntity(IQueryBuilder $query): Entity {
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return $this->mapRowToEntity($this->findOneQuery($query));
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}
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}
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