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<?php
namespace ORM;
use Database;
use PDOStatement;
abstract class Repository {
protected $Database;
protected $entities = [];
abstract public static function getTableName(): string;
abstract public static function getClassName(): string;
public function __construct(Database $Database) {
$this->Database = $Database;
}
#===============================================================================
# Fetch entity from a PDOStatement result
#===============================================================================
protected function fetchEntity(PDOStatement $Statement): ?EntityInterface {
if($Entity = $Statement->fetchObject(static::getClassName())) {
$this->storeInstance($Entity->getID(), $Entity);
return $Entity;
}
return NULL;
}
#===============================================================================
# Fetch multiple entities from a PDOStatement result
#===============================================================================
protected function fetchEntities(PDOStatement $Statement): array {
if($entities = $Statement->fetchAll($this->Database::FETCH_CLASS, static::getClassName())) {
$this->storeMultipleInstances($entities);
return $entities;
}
return [];
}
#===============================================================================
# Adds an entity to the runtime cache
#===============================================================================
protected function storeInstance(int $identifier, EntityInterface $Entity) {
return $this->entities[$identifier] = $Entity;
}
#===============================================================================
# Adds an array of entities to the runtime cache
#===============================================================================
protected function storeMultipleInstances(array $entities) {
foreach($entities as $Entity) {
$this->storeInstance($Entity->getID(), $Entity);
}
return $entities;
}
#===============================================================================
# Gets an entity from the runtime cache
#===============================================================================
protected function fetchInstance($identifier) {
return $this->entities[$identifier] ?? FALSE;
}
#===============================================================================
# Removes an entity from the runtime cache
#===============================================================================
protected function removeInstance($identifier) {
if(isset($this->entities[$identifier])) {
unset($this->entities[$identifier]);
}
}
#===========================================================================
# Insert entity
#===========================================================================
public function insert(EntityInterface $Entity): bool {
foreach($Entity->getModifiedKeys() as $attribute) {
$params[] = $Entity->get($attribute);
$fields[] = $attribute;
$values[] = '?';
}
if(isset($params, $fields, $values)) {
$fields = implode(', ', $fields);
$values = implode(', ', $values);
$query = sprintf('INSERT INTO %s (%s) VALUES(%s)',
static::getTableName(), $fields, $values);
$Statement = $this->Database->prepare($query);
return $Statement->execute($params);
}
return FALSE;
}
#===========================================================================
# Update entity
#===========================================================================
public function update(EntityInterface $Entity): bool {
foreach($Entity->getModifiedKeys() as $attribute) {
$params[] = $Entity->get($attribute);
$fields[] = "$attribute = ?";
}
if(isset($params, $fields)) {
$fields = implode(', ', $fields);
$query = sprintf('UPDATE %s SET %s WHERE id = %d',
static::getTableName(), $fields, $Entity->getID());
$Statement = $this->Database->prepare($query);
return $Statement->execute($params);
}
return FALSE;
}
#===========================================================================
# Delete entity
#===========================================================================
public function delete(EntityInterface $Entity): bool {
$query = 'DELETE FROM %s WHERE id = ?';
$query = sprintf($query, static::getTableName());
$Statement = $this->Database->prepare($query);
return $Statement->execute([$Entity->getID()]);
}
#===========================================================================
# Find entity based on primary key
#===========================================================================
public function find($id): ?EntityInterface {
if($Entity = $this->fetchInstance($id)) {
return $Entity;
}
return $this->findBy('id', $id);
}
#===============================================================================
# Find entity based on specific field comparison
#===============================================================================
public function findBy(string $field, $value): ?EntityInterface {
$query = 'SELECT * FROM %s WHERE %s = ?';
$query = sprintf($query, static::getTableName(), $field);
$Statement = $this->Database->prepare($query);
$Statement->execute([$value]);
return $this->fetchEntity($Statement);
}
#===============================================================================
# Find previous entity
#===============================================================================
public function findPrev(EntityInterface $Entity): ?EntityInterface {
$query = 'SELECT * FROM %s WHERE time_insert < ? ORDER BY time_insert DESC LIMIT 1';
$query = sprintf($query, static::getTableName());
$Statement = $this->Database->prepare($query);
$Statement->execute([$Entity->get('time_insert')]);
return $this->fetchEntity($Statement);
}
#===============================================================================
# Find next entity
#===============================================================================
public function findNext(EntityInterface $Entity): ?EntityInterface {
$query = 'SELECT * FROM %s WHERE time_insert > ? ORDER BY time_insert ASC LIMIT 1';
$query = sprintf($query, static::getTableName());
$Statement = $this->Database->prepare($query);
$Statement->execute([$Entity->get('time_insert')]);
return $this->fetchEntity($Statement);
}
#===========================================================================
# Find last (which means the newest) entity
#===========================================================================
public function getLast(): ?EntityInterface {
$query = 'SELECT * FROM %s ORDER BY time_insert DESC LIMIT 1';
$query = sprintf($query, static::getTableName());
$Statement = $this->Database->query($query);
return $this->fetchEntity($Statement);
}
#===========================================================================
# Get entity count
#===========================================================================
public function getCount(array $filter = []): int {
$wheres = [];
$params = [];
if(!empty($filter)) {
foreach($filter as $column => $value) {
if($value === NULL) {
$wheres[] = "$column IS NULL";
} else {
$wheres[] = "$column = ?";
$params[] = $value;
}
}
$where = 'WHERE '.implode(' AND ', $wheres);
}
$query = 'SELECT COUNT(id) FROM %s %s';
$query = sprintf($query, static::getTableName(), $where ?? '');
$Statement = $this->Database->prepare($query);
$Statement->execute($params);
return $Statement->fetchColumn();
}
#===========================================================================
# Get paginated entity list
#===========================================================================
public function getPaginated(string $order, int $limit, int $offset = 0): array {
return $this->getAll([], $order, $limit, $offset);
}
#===========================================================================
# Get all entities
#===========================================================================
public function getAll(array $filter = [], string $order = null, int $limit = null, int $offset = 0): array {
$select = 'SELECT * FROM '.static::getTableName();
$wheres = [];
$params = [];
if(!empty($filter)) {
foreach($filter as $column => $value) {
if($value === NULL) {
$wheres[] = "$column IS NULL";
} else {
$wheres[] = "$column = ?";
$params[] = $value;
}
}
$where = 'WHERE '.implode(' AND ', $wheres);
}
if($order) {
$order = "ORDER BY $order";
}
if($limit) {
$limit = "LIMIT $offset,$limit";
}
$query = "$select %s %s %s";
$query = sprintf($query, $where ?? '', $order ?? '', $limit ?? '');
$Statement = $this->Database->prepare($query);
$Statement->execute($params);
return $this->fetchEntities($Statement);
}
}
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