nextcloud/lib/public/appframework/db/mapper.php

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<?php
/**
* ownCloud - App Framework
*
* @author Bernhard Posselt
* @author Morris Jobke
* @copyright 2012 Bernhard Posselt dev@bernhard-posselt.com
* @copyright 2013 Morris Jobke morris.jobke@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCP\AppFramework\Db;
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use \OCP\IDb;
/**
* Simple parent class for inheriting your data access layer from. This class
* may be subject to change in the future
*/
abstract class Mapper {
protected $tableName;
protected $entityClass;
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protected $db;
/**
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* @param IDb $db Instance of the Db abstraction layer
* @param string $tableName the name of the table. set this to allow entity
* @param string $entityClass the name of the entity that the sql should be
* mapped to queries without using sql
*/
public function __construct(IDb $db, $tableName, $entityClass=null){
$this->db = $db;
$this->tableName = '*PREFIX*' . $tableName;
// if not given set the entity name to the class without the mapper part
// cache it here for later use since reflection is slow
if($entityClass === null) {
$this->entityClass = str_replace('Mapper', '', get_class($this));
} else {
$this->entityClass = $entityClass;
}
}
/**
* @return string the table name
*/
public function getTableName(){
return $this->tableName;
}
/**
* Deletes an entity from the table
* @param Entity $entity the entity that should be deleted
*/
public function delete(Entity $entity){
$sql = 'DELETE FROM `' . $this->tableName . '` WHERE `id` = ?';
$this->execute($sql, array($entity->getId()));
}
/**
* Creates a new entry in the db from an entity
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* @param Entity $entity the entity that should be created
* @return Entity the saved entity with the set id
*/
public function insert(Entity $entity){
// get updated fields to save, fields have to be set using a setter to
// be saved
$properties = $entity->getUpdatedFields();
$values = '';
$columns = '';
$params = array();
// build the fields
$i = 0;
foreach($properties as $property => $updated) {
$column = $entity->propertyToColumn($property);
$getter = 'get' . ucfirst($property);
$columns .= '`' . $column . '`';
$values .= '?';
// only append colon if there are more entries
if($i < count($properties)-1){
$columns .= ',';
$values .= ',';
}
array_push($params, $entity->$getter());
$i++;
}
$sql = 'INSERT INTO `' . $this->tableName . '`(' .
$columns . ') VALUES(' . $values . ')';
$this->execute($sql, $params);
$entity->setId((int) $this->db->getInsertId($this->tableName));
return $entity;
}
/**
* Updates an entry in the db from an entity
* @throws \InvalidArgumentException if entity has no id
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* @param Entity $entity the entity that should be created
* @return Entity the saved entity with the set id
*/
public function update(Entity $entity){
// if entity wasn't changed it makes no sense to run a db query
$properties = $entity->getUpdatedFields();
if(count($properties) === 0) {
return $entity;
}
// entity needs an id
$id = $entity->getId();
if($id === null){
throw new \InvalidArgumentException(
'Entity which should be updated has no id');
}
// get updated fields to save, fields have to be set using a setter to
// be saved
// do not update the id field
unset($properties['id']);
$columns = '';
$params = array();
// build the fields
$i = 0;
foreach($properties as $property => $updated) {
$column = $entity->propertyToColumn($property);
$getter = 'get' . ucfirst($property);
$columns .= '`' . $column . '` = ?';
// only append colon if there are more entries
if($i < count($properties)-1){
$columns .= ',';
}
array_push($params, $entity->$getter());
$i++;
}
$sql = 'UPDATE `' . $this->tableName . '` SET ' .
$columns . ' WHERE `id` = ?';
array_push($params, $id);
$this->execute($sql, $params);
return $entity;
}
/**
* Runs an sql query
* @param string $sql the prepare string
* @param array $params the params which should replace the ? in the sql query
* @param int $limit the maximum number of rows
* @param int $offset from which row we want to start
* @return \PDOStatement the database query result
*/
protected function execute($sql, array $params=array(), $limit=null, $offset=null){
$query = $this->db->prepareQuery($sql, $limit, $offset);
$index = 1; // bindParam is 1 indexed
foreach($params as $param) {
switch (gettype($param)) {
case 'integer':
$pdoConstant = \PDO::PARAM_INT;
break;
case 'boolean':
$pdoConstant = \PDO::PARAM_BOOL;
break;
default:
$pdoConstant = \PDO::PARAM_STR;
break;
}
$query->bindValue($index, $param, $pdoConstant);
$index++;
}
return $query->execute();
}
/**
* Returns an db result and throws exceptions when there are more or less
* results
* @see findEntity
* @param string $sql the sql query
* @param array $params the parameters of the sql query
* @param int $limit the maximum number of rows
* @param int $offset from which row we want to start
* @throws DoesNotExistException if the item does not exist
* @throws MultipleObjectsReturnedException if more than one item exist
* @return array the result as row
*/
protected function findOneQuery($sql, array $params=array(), $limit=null, $offset=null){
$result = $this->execute($sql, $params, $limit, $offset);
$row = $result->fetch();
if($row === false || $row === null){
throw new DoesNotExistException('No matching entry found');
}
$row2 = $result->fetch();
//MDB2 returns null, PDO and doctrine false when no row is available
if( ! ($row2 === false || $row2 === null )) {
throw new MultipleObjectsReturnedException('More than one result');
} else {
return $row;
}
}
/**
* Creates an entity from a row. Automatically determines the entity class
* from the current mapper name (MyEntityMapper -> MyEntity)
* @param array $row the row which should be converted to an entity
* @return Entity the entity
*/
protected function mapRowToEntity($row) {
return call_user_func($this->entityClass .'::fromRow', $row);
}
/**
* Runs a sql query and returns an array of entities
* @param string $sql the prepare string
* @param array $params the params which should replace the ? in the sql query
* @param int $limit the maximum number of rows
* @param int $offset from which row we want to start
* @return array all fetched entities
*/
protected function findEntities($sql, array $params=array(), $limit=null, $offset=null) {
$result = $this->execute($sql, $params, $limit, $offset);
$entities = array();
while($row = $result->fetch()){
$entities[] = $this->mapRowToEntity($row);
}
return $entities;
}
/**
* Returns an db result and throws exceptions when there are more or less
* results
* @param string $sql the sql query
* @param array $params the parameters of the sql query
* @param int $limit the maximum number of rows
* @param int $offset from which row we want to start
* @throws DoesNotExistException if the item does not exist
* @throws MultipleObjectsReturnedException if more than one item exist
* @return Entity the entity
*/
protected function findEntity($sql, array $params=array(), $limit=null, $offset=null){
return $this->mapRowToEntity($this->findOneQuery($sql, $params, $limit, $offset));
}
}