363 lines
9.8 KiB
PHP
363 lines
9.8 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Bernhard Posselt <dev@bernhard-posselt.com>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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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 OCP\AppFramework\Db;
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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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* @since 7.0.0
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*/
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abstract class Mapper {
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protected $tableName;
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protected $entityClass;
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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 7.0.0
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*/
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public function __construct(IDBConnection $db, $tableName, $entityClass=null){
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$this->db = $db;
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$this->tableName = '*PREFIX*' . $tableName;
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// if not given set the entity name to the class without the mapper part
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// cache it here for later use since reflection is slow
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if($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 7.0.0
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*/
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public function getTableName(){
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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 7.0.0 - return value added in 8.1.0
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*/
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public function delete(Entity $entity){
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$sql = 'DELETE FROM `' . $this->tableName . '` WHERE `id` = ?';
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$stmt = $this->execute($sql, [$entity->getId()]);
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$stmt->closeCursor();
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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 7.0.0
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*/
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public function insert(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 = $entity->getUpdatedFields();
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$values = '';
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$columns = '';
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$params = [];
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// build the fields
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$i = 0;
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foreach($properties as $property => $updated) {
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$column = $entity->propertyToColumn($property);
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$getter = 'get' . ucfirst($property);
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$columns .= '`' . $column . '`';
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$values .= '?';
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// only append colon if there are more entries
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if($i < count($properties)-1){
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$columns .= ',';
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$values .= ',';
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}
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$params[] = $entity->$getter();
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$i++;
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}
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$sql = 'INSERT INTO `' . $this->tableName . '`(' .
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$columns . ') VALUES(' . $values . ')';
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$stmt = $this->execute($sql, $params);
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$entity->setId((int) $this->db->lastInsertId($this->tableName));
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$stmt->closeCursor();
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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 7.0.0 - return value was added in 8.0.0
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*/
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public function update(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($properties['id']);
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$columns = '';
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$params = [];
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// build the fields
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$i = 0;
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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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$columns .= '`' . $column . '` = ?';
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// only append colon if there are more entries
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if($i < count($properties)-1){
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$columns .= ',';
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}
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$params[] = $entity->$getter();
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$i++;
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}
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$sql = 'UPDATE `' . $this->tableName . '` SET ' .
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$columns . ' WHERE `id` = ?';
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$params[] = $id;
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$stmt = $this->execute($sql, $params);
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$stmt->closeCursor();
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return $entity;
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}
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/**
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* Checks if an array is associative
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* @param array $array
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* @return bool true if associative
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* @since 8.1.0
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*/
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private function isAssocArray(array $array) {
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return array_values($array) !== $array;
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}
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/**
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* Returns the correct PDO constant based on the value type
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* @param $value
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* @return int PDO constant
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* @since 8.1.0
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*/
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private function getPDOType($value) {
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switch (gettype($value)) {
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case 'integer':
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return \PDO::PARAM_INT;
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case 'boolean':
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return \PDO::PARAM_BOOL;
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default:
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return \PDO::PARAM_STR;
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}
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}
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/**
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* Runs an sql query
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* @param string $sql the prepare string
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* @param array $params the params which should replace the ? in the sql query
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* @param int $limit the maximum number of rows
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* @param int $offset from which row we want to start
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* @return \PDOStatement the database query result
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* @since 7.0.0
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*/
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protected function execute($sql, array $params=[], $limit=null, $offset=null){
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$query = $this->db->prepare($sql, $limit, $offset);
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if ($this->isAssocArray($params)) {
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foreach ($params as $key => $param) {
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$pdoConstant = $this->getPDOType($param);
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$query->bindValue($key, $param, $pdoConstant);
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}
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} else {
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$index = 1; // bindParam is 1 indexed
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foreach ($params as $param) {
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$pdoConstant = $this->getPDOType($param);
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$query->bindValue($index, $param, $pdoConstant);
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$index++;
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}
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}
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$result = $query->execute();
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return $query;
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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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* @see findEntity
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* @param string $sql the sql query
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* @param array $params the parameters of the sql query
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* @param int $limit the maximum number of rows
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* @param int $offset from which row we want to start
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* @throws DoesNotExistException if the item does not exist
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* @throws MultipleObjectsReturnedException if more than one item exist
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* @return array the result as row
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* @since 7.0.0
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*/
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protected function findOneQuery($sql, array $params=[], $limit=null, $offset=null){
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$stmt = $this->execute($sql, $params, $limit, $offset);
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$row = $stmt->fetch();
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if($row === false || $row === null){
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$stmt->closeCursor();
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$msg = $this->buildDebugMessage(
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'Did expect one result but found none when executing', $sql, $params, $limit, $offset
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);
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throw new DoesNotExistException($msg);
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}
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$row2 = $stmt->fetch();
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$stmt->closeCursor();
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//MDB2 returns null, PDO and doctrine false when no row is available
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if( ! ($row2 === false || $row2 === null )) {
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$msg = $this->buildDebugMessage(
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'Did not expect more than one result when executing', $sql, $params, $limit, $offset
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);
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throw new MultipleObjectsReturnedException($msg);
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} else {
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return $row;
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}
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}
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/**
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* Builds an error message by prepending the $msg to an error message which
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* has the parameters
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* @see findEntity
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* @param string $sql the sql query
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* @param array $params the parameters of the sql query
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* @param int $limit the maximum number of rows
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* @param int $offset from which row we want to start
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* @return string formatted error message string
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* @since 9.1.0
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*/
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private function buildDebugMessage($msg, $sql, array $params=[], $limit=null, $offset=null) {
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return $msg .
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': query "' . $sql . '"; ' .
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'parameters ' . print_r($params, true) . '; ' .
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'limit "' . $limit . '"; '.
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'offset "' . $offset . '"';
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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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* @param array $row the row which should be converted to an entity
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* @return Entity the entity
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* @since 7.0.0
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*/
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protected function mapRowToEntity($row) {
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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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* @param string $sql the prepare string
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* @param array $params the params which should replace the ? in the sql query
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* @param int $limit the maximum number of rows
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* @param int $offset from which row we want to start
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* @return array all fetched entities
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* @since 7.0.0
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*/
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protected function findEntities($sql, array $params=[], $limit=null, $offset=null) {
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$stmt = $this->execute($sql, $params, $limit, $offset);
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$entities = [];
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while($row = $stmt->fetch()){
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$entities[] = $this->mapRowToEntity($row);
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}
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$stmt->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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* @param string $sql the sql query
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* @param array $params the parameters of the sql query
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* @param int $limit the maximum number of rows
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* @param int $offset from which row we want to start
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* @throws DoesNotExistException if the item does not exist
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* @throws MultipleObjectsReturnedException if more than one item exist
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* @return Entity the entity
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* @since 7.0.0
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*/
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protected function findEntity($sql, array $params=[], $limit=null, $offset=null){
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return $this->mapRowToEntity($this->findOneQuery($sql, $params, $limit, $offset));
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}
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}
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