Implement new Repository and Entity classes

This commit adds new Repository and Entity classes which are better
abstracted from the rest of the application. They dont know anymore
about configuration options or how to parse to HTML because this is
not the job for the ORM but for other parts of the application.

The previous commits were a preparation for this big change.

An entity now represents just a single record from a specific table
of the database – nothing more. The repositories job is it to fetch
or update records of the database and instantiate the entities.

Another problem that was solved is the high amount of database queries
that was needed before. For example, on the blogs home page first were
all 10 latest post IDs fetched from the database and then another query
was executed with "WHERE id = :id" for *each* single post?! ...

This problem is solved with the new repository classes; they now use a
single query to fetch and build the entities of the 10 latest posts.

This change also solves the problem with database queries spread across
the application and limits the exzessive use of try/catch blocks which
were used before. The new classes make the whole code much cleaner. :)

26 files changed, 480 insertions, 362 deletions

diff --git a/core/namespace/Application.php b/core/namespace/Application.php
index f9a8196..7473e1f 100644
--- a/core/namespace/Application.php
+++ b/core/namespace/Application.php
@@ -6,6 +6,7 @@ class Application {
 	#===============================================================================
 	private static $Database;
 	private static $Language;
+	private static $repositories = [];
 
 	#===============================================================================
 	# Configuration array
@@ -68,6 +69,21 @@ class Application {
 	}
 
 	#===============================================================================
+	# Return singleton repository instance
+	#===============================================================================
+	public function getRepository(string $namespace): Repository {
+		$identifier = strtolower($namespace);
+		$repository = "$namespace\Repository";
+
+		if(!isset(self::$repositories[$identifier])) {
+			$Repository = new $repository(self::getDatabase());
+			self::$repositories[$identifier] = $Repository;
+		}
+
+		return self::$repositories[$identifier];
+	}
+
+	#===============================================================================
 	# Return unique CSRF token for the current session
 	#===============================================================================
 	public static function getSecurityToken(): string {
@@ -142,15 +158,15 @@ class Application {
 	#===============================================================================
 	# Return absolute URL of a specifc entity
 	#===============================================================================
-	public function getEntityURL(Item $Entity) {
+	public function getEntityURL(EntityInterface $Entity) {
 		switch($class = get_class($Entity)) {
-			case 'Page\Item':
+			case 'Page\Entity':
 				$attr = self::get('PAGE.SLUG_URLS') ? 'slug' : 'id';
 				return self::getPageURL($Entity->get($attr).'/');
-			case 'Post\Item':
+			case 'Post\Entity':
 				$attr = self::get('POST.SLUG_URLS') ? 'slug' : 'id';
 				return self::getPostURL($Entity->get($attr).'/');
-			case 'User\Item':
+			case 'User\Entity':
 				$attr = self::get('USER.SLUG_URLS') ? 'slug' : 'id';
 				return self::getUserURL($Entity->get($attr).'/');
 			default:
diff --git a/core/namespace/Attribute.php b/core/namespace/Attribute.php
deleted file mode 100644
index c874a57..0000000
--- a/core/namespace/Attribute.php
+++ /dev/null
@@ -1,84 +0,0 @@
-<?php
-abstract class Attribute {
-
-	#===============================================================================
-	# Set attribute
-	#===============================================================================
-	public function set($attribute, $value) {
-		return $this->{$attribute} = $value;
-	}
-
-	#===============================================================================
-	# Get attribute
-	#===============================================================================
-	public function get($attribute) {
-		return $this->{$attribute} ?? NULL;
-	}
-
-	#===============================================================================
-	# Get all attributes
-	#===============================================================================
-	public function getAll($exclude = []): array {
-		$attributes = get_object_vars($this);
-
-		return array_filter($attributes, function($attribute) use($exclude) {
-			return !in_array($attribute, $exclude);
-		}, ARRAY_FILTER_USE_KEY);
-	}
-
-	#===============================================================================
-	# Get array with not FALSE attributes
-	#===============================================================================
-	protected function getFilteredAttributes(): array {
-		return array_filter(get_object_vars($this), function($value) {
-			return $value !== FALSE;
-		});
-	}
-
-	#===============================================================================
-	# Insert database item
-	#===============================================================================
-	public function insert(\Database $Database): bool {
-		$part[0] = '';
-		$part[1] = '';
-
-		$attributes = $this->getFilteredAttributes();
-
-		foreach($attributes as $column => $value) {
-			$part[0] .= "{$column},";
-			$part[1] .= '?,';
-		}
-
-		$part[0] = rtrim($part[0], ',');
-		$part[1] = rtrim($part[1], ',');
-
-		$Statement = $Database->prepare('INSERT INTO '.static::TABLE." ({$part[0]}) VALUES ({$part[1]})");
-		return $Statement->execute(array_values($attributes));
-	}
-
-	#===============================================================================
-	# Update database item
-	#===============================================================================
-	public function update(\Database $Database): bool {
-		$part = '';
-
-		$attributes = $this->getFilteredAttributes();
-
-		foreach($attributes as $column => $value) {
-			$part .= "{$column} = ?,";
-		}
-
-		$part = rtrim($part, ',');
-
-		$Statement = $Database->prepare('UPDATE '.static::TABLE.' SET '.$part.' WHERE id = '.(int) $this->get('id'));
-		return $Statement->execute(array_values($attributes));
-	}
-
-	#===============================================================================
-	# Delete database item
-	#===============================================================================
-	public function delete(\Database $Database): bool {
-		$Statement = $Database->prepare('DELETE FROM '.static::TABLE.' WHERE id = ?');
-		return $Statement->execute([$this->get('id')]);
-	}
-}
diff --git a/core/namespace/Entity.php b/core/namespace/Entity.php
new file mode 100644
index 0000000..4bedd37
--- /dev/null
+++ b/core/namespace/Entity.php
@@ -0,0 +1,47 @@
+<?php
+abstract class Entity implements EntityInterface {
+	protected $id;
+	protected $time_insert;
+	protected $time_update;
+
+	#===============================================================================
+	# Get attribute
+	#===============================================================================
+	public function get(string $attribute) {
+		return $this->{$attribute} ?? NULL;
+	}
+
+	#===============================================================================
+	# Set attribute
+	#===============================================================================
+	public function set(string $attribute, $value) {
+		return $this->{$attribute} = $value;
+	}
+
+	#===============================================================================
+	# Return ID
+	#===============================================================================
+	final public function getID(): int {
+		return $this->id;
+	}
+
+	#===============================================================================
+	# Get all attributes
+	#===============================================================================
+	public function getAll(array $exclude = []): array {
+		$attributes = get_object_vars($this);
+
+		return array_filter($attributes, function($attribute) use($exclude) {
+			return !in_array($attribute, $exclude);
+		}, ARRAY_FILTER_USE_KEY);
+	}
+
+	#===============================================================================
+	# Get array with all non-false attributes
+	#===============================================================================
+	public function getFilteredAttributes(): array {
+		return array_filter(get_object_vars($this), function($value) {
+			return $value !== FALSE;
+		});
+	}
+}
diff --git a/core/namespace/EntityInterface.php b/core/namespace/EntityInterface.php
new file mode 100644
index 0000000..8eaa089
--- /dev/null
+++ b/core/namespace/EntityInterface.php
@@ -0,0 +1,8 @@
+<?php
+interface EntityInterface {
+	public function get(string $attribute);
+	public function set(string $attribute, $value);
+
+	public function getID(): int;
+	public function getAll(array $exclude = []): array;
+}
diff --git a/core/namespace/Item.php b/core/namespace/Item.php
deleted file mode 100644
index 453a3e6..0000000
--- a/core/namespace/Item.php
+++ /dev/null
@@ -1,98 +0,0 @@
-<?php
-abstract class Item implements ItemInterface {
-	protected $Database   = NULL;
-	protected $Attribute  = NULL;
-	protected $Reflection = NULL;
-
-	#===============================================================================
-	# Abstract item constructor
-	#===============================================================================
-	public final function __construct($itemID, \Database $Database) {
-		$this->Database = $Database;
-
-		$this->Reflection = new ReflectionObject($this);
-
-		$attribute = "{$this->Reflection->getNamespaceName()}\\Attribute";
-		$exception = "{$this->Reflection->getNamespaceName()}\\Exception";
-
-		#===============================================================================
-		# Checking if item in database exists
-		#===============================================================================
-		$Statement = $Database->prepare(sprintf('SELECT * FROM %s WHERE id = ?', $attribute::TABLE));
-		$Statement->execute([$itemID]);
-
-		#===============================================================================
-		# Checking if retrieving data failed
-		#===============================================================================
-		if(!$this->Attribute = $Statement->fetchObject($attribute)) {
-			throw new $exception(sprintf('%s\\Item with ID %s does not exist', $this->Reflection->getNamespaceName(), (int) $itemID));
-		}
-	}
-
-	#===============================================================================
-	# Return attribute by name (short hand wrapper)
-	#===============================================================================
-	public function get($attribute) {
-		return $this->Attribute->get($attribute);
-	}
-
-	#===============================================================================
-	# Return Attribute object
-	#===============================================================================
-	public final function getAttribute(): Attribute {
-		return $this->Attribute;
-	}
-
-	#===============================================================================
-	# Return unique ID
-	#===============================================================================
-	public final function getID(): int {
-		return $this->Attribute->get('id');
-	}
-
-	#===============================================================================
-	# Return previous item ID
-	#===============================================================================
-	public function getPrevID(): int {
-		$execute = 'SELECT id FROM %s WHERE time_insert < ? ORDER BY time_insert DESC LIMIT 1';
-
-		$attribute = "{$this->Reflection->getNamespaceName()}\\Attribute";
-		$Statement = $this->Database->prepare(sprintf($execute, $attribute::TABLE));
-
-		if($Statement->execute([$this->Attribute->get('time_insert')])) {
-			return $Statement->fetchColumn();
-		}
-
-		return 0;
-	}
-
-	#===============================================================================
-	# Return next item ID
-	#===============================================================================
-	public function getNextID(): int {
-		$execute = 'SELECT id FROM %s WHERE time_insert > ? ORDER BY time_insert ASC LIMIT 1';
-
-		$attribute = "{$this->Reflection->getNamespaceName()}\\Attribute";
-		$Statement = $this->Database->prepare(sprintf($execute, $attribute::TABLE));
-
-		if($Statement->execute([$this->Attribute->get('time_insert')])) {
-			return $Statement->fetchColumn();
-		}
-
-		return 0;
-	}
-
-	#===============================================================================
-	# Return unique ID based on specific field comparison with value
-	#===============================================================================
-	public static function getIDByField($field, $value, \Database $Database): int {
-		$attribute = (new ReflectionClass(get_called_class()))->getNamespaceName().'\\Attribute';
-		$Statement = $Database->prepare('SELECT id FROM '.$attribute::TABLE." WHERE {$field} = ?");
-
-		if($Statement->execute([$value])) {
-			return $Statement->fetchColumn();
-		}
-
-		return 0;
-	}
-}
diff --git a/core/namespace/ItemFactory.php b/core/namespace/ItemFactory.php
deleted file mode 100644
index d81ff9f..0000000
--- a/core/namespace/ItemFactory.php
+++ /dev/null
@@ -1,23 +0,0 @@
-<?php
-abstract class ItemFactory extends Factory {
-
-	#===========================================================================
-	# Build instance by ID
-	#===========================================================================
-	public static function build($itemID): Item {
-		if(!$Instance = parent::fetchInstance($itemID)) {
-			$Item = (new ReflectionClass(get_called_class()))->getNamespaceName().'\\Item';
-			$Instance = parent::storeInstance($itemID, new $Item($itemID, \Application::getDatabase()));
-		}
-
-		return $Instance;
-	}
-
-	#===========================================================================
-	# Build instance by slug
-	#===========================================================================
-	public static function buildBySlug($slug): Item {
-		$Item = (new ReflectionClass(get_called_class()))->getNamespaceName().'\\Item';
-		return self::build($Item::getIDByField('slug', $slug, \Application::getDatabase()));
-	}
-}
diff --git a/core/namespace/ItemInterface.php b/core/namespace/ItemInterface.php
deleted file mode 100644
index efee734..0000000
--- a/core/namespace/ItemInterface.php
+++ /dev/null
@@ -1,4 +0,0 @@
-<?php
-interface ItemInterface {
-	public function __construct($itemID, \Database $Database);
-}
diff --git a/core/namespace/Page/Attribute.php b/core/namespace/Page/Attribute.php
deleted file mode 100644
index 05eaa33..0000000
--- a/core/namespace/Page/Attribute.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-namespace Page;
-
-class Attribute extends \Attribute {
-
-	#===============================================================================
-	# Pre-Define database table columns
-	#===============================================================================
-	protected $id   = FALSE;
-	protected $user = FALSE;
-	protected $slug = FALSE;
-	protected $name = FALSE;
-	protected $body = FALSE;
-	protected $argv = FALSE;
-	protected $time_insert = FALSE;
-	protected $time_update = FALSE;
-
-	#===============================================================================
-	# Define database table name
-	#===============================================================================
-	const TABLE = 'page';
-}
diff --git a/core/namespace/Page/Entity.php b/core/namespace/Page/Entity.php
new file mode 100644
index 0000000..6ca5979
--- /dev/null
+++ b/core/namespace/Page/Entity.php
@@ -0,0 +1,13 @@
+<?php
+namespace Page;
+
+class Entity extends \Entity {
+	protected $id   = FALSE;
+	protected $user = FALSE;
+	protected $slug = FALSE;
+	protected $name = FALSE;
+	protected $body = FALSE;
+	protected $argv = FALSE;
+	protected $time_insert = FALSE;
+	protected $time_update = FALSE;
+}
diff --git a/core/namespace/Page/Exception.php b/core/namespace/Page/Exception.php
deleted file mode 100644
index c41bddc..0000000
--- a/core/namespace/Page/Exception.php
+++ /dev/null
@@ -1,4 +0,0 @@
-<?php
-namespace Page;
-
-class Exception extends \Exception {}
diff --git a/core/namespace/Page/Factory.php b/core/namespace/Page/Factory.php
deleted file mode 100644
index 2fcc361..0000000
--- a/core/namespace/Page/Factory.php
+++ /dev/null
@@ -1,4 +0,0 @@
-<?php
-namespace Page;
-
-class Factory extends \ItemFactory {}
diff --git a/core/namespace/Page/Item.php b/core/namespace/Page/Item.php
deleted file mode 100644
index cbc99e6..0000000
--- a/core/namespace/Page/Item.php
+++ /dev/null
@@ -1,20 +0,0 @@
-<?php
-namespace Page;
-
-class Item extends \Item {
-	const CONFIGURATION = 'PAGE';
-
-	#===============================================================================
-	# Return unique page IDs for search results
-	#===============================================================================
-	public static function getSearchResultIDs($search, \Database $Database): array {
-		$Statement = $Database->prepare(sprintf("SELECT id FROM %s WHERE
-			MATCH(name, body) AGAINST(? IN BOOLEAN MODE) LIMIT 20", Attribute::TABLE));
-
-		if($Statement->execute([$search])) {
-			return $Statement->fetchAll($Database::FETCH_COLUMN);
-		}
-
-		return [];
-	}
-}
diff --git a/core/namespace/Page/Repository.php b/core/namespace/Page/Repository.php
new file mode 100644
index 0000000..b76ef85
--- /dev/null
+++ b/core/namespace/Page/Repository.php
@@ -0,0 +1,17 @@
+<?php
+namespace Page;
+
+class Repository extends \Repository {
+	public static function getTableName(): string { return 'page'; }
+	public static function getClassName(): string { return 'Page\Entity'; }
+
+	public function getCountByUser(\User\Entity $User): int {
+		$query = 'SELECT COUNT(id) FROM %s WHERE user = ?';
+		$query = sprintf($query, static::getTableName());
+
+		$Statement = $this->Database->prepare($query);
+		$Statement->execute([$User->getID()]);
+
+		return $Statement->fetchColumn();
+	}
+}
diff --git a/core/namespace/Post/Attribute.php b/core/namespace/Post/Attribute.php
deleted file mode 100644
index 20aafae..0000000
--- a/core/namespace/Post/Attribute.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-namespace Post;
-
-class Attribute extends \Attribute {
-
-	#===============================================================================
-	# Pre-Define database table columns
-	#===============================================================================
-	protected $id   = FALSE;
-	protected $user = FALSE;
-	protected $slug = FALSE;
-	protected $name = FALSE;
-	protected $body = FALSE;
-	protected $argv = FALSE;
-	protected $time_insert = FALSE;
-	protected $time_update = FALSE;
-
-	#===============================================================================
-	# Define database table name
-	#===============================================================================
-	const TABLE = 'post';
-}
diff --git a/core/namespace/Post/Entity.php b/core/namespace/Post/Entity.php
new file mode 100644
index 0000000..399f5bb
--- /dev/null
+++ b/core/namespace/Post/Entity.php
@@ -0,0 +1,13 @@
+<?php
+namespace Post;
+
+class Entity extends \Entity {
+	protected $id   = FALSE;
+	protected $user = FALSE;
+	protected $slug = FALSE;
+	protected $name = FALSE;
+	protected $body = FALSE;
+	protected $argv = FALSE;
+	protected $time_insert = FALSE;
+	protected $time_update = FALSE;
+}
diff --git a/core/namespace/Post/Exception.php b/core/namespace/Post/Exception.php
deleted file mode 100644
index 29b9345..0000000
--- a/core/namespace/Post/Exception.php
+++ /dev/null
@@ -1,4 +0,0 @@
-<?php
-namespace Post;
-
-class Exception extends \Exception {}
diff --git a/core/namespace/Post/Factory.php b/core/namespace/Post/Factory.php
deleted file mode 100644
index 20b29cc..0000000
--- a/core/namespace/Post/Factory.php
+++ /dev/null
@@ -1,4 +0,0 @@
-<?php
-namespace Post;
-
-class Factory extends \ItemFactory {}
diff --git a/core/namespace/Post/Item.php b/core/namespace/Post/Item.php
deleted file mode 100644
index e8b4615..0000000
--- a/core/namespace/Post/Item.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-namespace Post;
-
-class Item extends \Item {
-	const CONFIGURATION = 'POST';
-
-	#===============================================================================
-	# Return unique post IDs for search results
-	#===============================================================================
-	public static function getSearchResultIDs($search, array $date, \Database $Database): array {
-		$D = ($D = intval($date[0])) !== 0 ? $D : 'NULL';
-		$M = ($M = intval($date[1])) !== 0 ? $M : 'NULL';
-		$Y = ($Y = intval($date[2])) !== 0 ? $Y : 'NULL';
-
-		$Statement = $Database->prepare(sprintf("SELECT id FROM %s WHERE 
-			({$Y} IS NULL OR YEAR(time_insert) = {$Y})  AND
-			({$M} IS NULL OR MONTH(time_insert) = {$M}) AND
-			({$D} IS NULL OR DAY(time_insert) = {$D})   AND
-			MATCH(name, body) AGAINST(? IN BOOLEAN MODE) LIMIT 20", Attribute::TABLE));
-
-		if($Statement->execute([$search])) {
-			return $Statement->fetchAll($Database::FETCH_COLUMN);
-		}
-
-		return [];
-	}
-}
diff --git a/core/namespace/Post/Repository.php b/core/namespace/Post/Repository.php
new file mode 100644
index 0000000..5a3d834
--- /dev/null
+++ b/core/namespace/Post/Repository.php
@@ -0,0 +1,17 @@
+<?php
+namespace Post;
+
+class Repository extends \Repository {
+	public static function getTableName(): string { return 'post'; }
+	public static function getClassName(): string { return 'Post\Entity'; }
+
+	public function getCountByUser(\User\Entity $User): int {
+		$query = 'SELECT COUNT(id) FROM %s WHERE user = ?';
+		$query = sprintf($query, static::getTableName());
+
+		$Statement = $this->Database->prepare($query);
+		$Statement->execute([$User->getID()]);
+
+		return $Statement->fetchColumn();
+	}
+}
diff --git a/core/namespace/Repository.php b/core/namespace/Repository.php
new file mode 100644
index 0000000..2c238b8
--- /dev/null
+++ b/core/namespace/Repository.php
@@ -0,0 +1,323 @@
+<?php
+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;
+	}
+
+	#===============================================================================
+	# 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(int $identifier) {
+		return $this->entities[$identifier] ?? FALSE;
+	}
+
+	#===============================================================================
+	# Removes an entity from the runtime cache
+	#===============================================================================
+	protected function removeInstance(int $identifier) {
+		if(isset($this->cache[$identifier])) {
+			unset($this->cache[$identifier]);
+		}
+	}
+
+	#===========================================================================
+	# Insert entity
+	#===========================================================================
+	public function insert(EntityInterface $Entity): bool {
+		$attributes = $Entity->getFilteredAttributes();
+
+		foreach($attributes as $field => $value) {
+			$fields[] = $field;
+			$values[] = '?';
+		}
+
+		$fields = implode(', ', $fields ?? []);
+		$values = implode(', ', $values ?? []);
+
+		$query = 'INSERT INTO %s (%s) VALUES(%s)';
+		$query = sprintf($query, static::getTableName(), $fields, $values);
+
+		$Statement = $this->Database->prepare($query);
+		return $Statement->execute(array_values($attributes));
+	}
+
+	#===========================================================================
+	# Update entity
+	#===========================================================================
+	public function update(EntityInterface $Entity): bool {
+		$attributes = $Entity->getFilteredAttributes();
+
+		foreach($attributes as $field => $value) {
+			$params[] = "$field = ?";
+		}
+
+		$params = implode(', ', $params ?? []);
+
+		$query = 'UPDATE %s SET %s WHERE id = '.intval($Entity->getID());
+		$query = sprintf($query, static::getTableName(), $params);
+
+		$Statement = $this->Database->prepare($query);
+		return $Statement->execute(array_values($attributes));
+	}
+
+	#===========================================================================
+	# 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(int $id): ?EntityInterface {
+		if($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]);
+
+		if($Entity = $Statement->fetchObject(static::getClassName())) {
+			$this->storeInstance($Entity->getID(), $Entity);
+			return $Entity;
+		}
+
+		return NULL;
+	}
+
+	#===============================================================================
+	# Find previous entitiy
+	#===============================================================================
+	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')]);
+
+		if($Entity = $Statement->fetchObject(static::getClassName())) {
+			$this->storeInstance($Entity->getID(), $Entity);
+			return $Entity;
+		}
+
+		return NULL;
+	}
+
+	#===============================================================================
+	# 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')]);
+
+		if($Entity = $Statement->fetchObject(static::getClassName())) {
+			$this->storeInstance($Entity->getID(), $Entity);
+			return $Entity;
+		}
+
+		return NULL;
+	}
+
+	#===========================================================================
+	# 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);
+
+		if($Entity = $Statement->fetchObject(static::getClassName())) {
+			$this->storeInstance($Entity->getID(), $Entity);
+			return $Entity;
+		}
+
+		return NULL;
+	}
+
+	#===========================================================================
+	# Get entity count
+	#===========================================================================
+	public function getCount(): int {
+		$query = 'SELECT COUNT(id) FROM %s';
+		$query = sprintf($query, static::getTableName());
+
+		return $this->Database->query($query)->fetchColumn();
+	}
+
+	#===========================================================================
+	# Get paginated entity list
+	#===========================================================================
+	public function getPaginated(string $order, int $limit, int $offset = 0): array {
+		return $this->getAll([], $order, "$offset,$limit");
+	}
+
+	#===========================================================================
+	# Get all entities
+	#===========================================================================
+	public function getAll(array $filter = [], string $order = null, string $limit = null): array {
+		$select = 'SELECT * FROM '.static::getTableName();
+		$wheres = [];
+		$params = [];
+
+		if(!empty($filter)) {
+			foreach($filter as $column => $value) {
+				$wheres[] = "$column = ?";
+				$params[] = $value;
+			}
+
+			$where = 'WHERE '.implode(' AND ', $wheres);
+		}
+
+		if($order) {
+			$order = "ORDER BY $order";
+		}
+
+		if($limit) {
+			$limit = "LIMIT $limit";
+		}
+
+		$query = "$select %s %s %s";
+		$query = sprintf($query, $where ?? '', $order ?? '', $limit ?? '');
+
+		$Statement = $this->Database->prepare($query);
+		$Statement->execute($params);
+
+		if($entities = $Statement->fetchAll($this->Database::FETCH_CLASS, static::getClassName())) {
+			$this->storeMultipleInstances($entities);
+			return $entities;
+		}
+
+		return [];
+	}
+
+	#===============================================================================
+	# Get entities based on search query
+	#===============================================================================
+	public function search(string $search, array $filter = []): array {
+		if($search === '*') {
+			return $this->getAll([], NULL, 20);
+		}
+
+		if(strlen($filter['year'] ?? '') !== 0) {
+			$extend[] = 'YEAR(time_insert) = ? AND';
+			$params[] = $filter['year'];
+		}
+
+		if(strlen($filter['month'] ?? '') !== 0) {
+			$extend[] = 'MONTH(time_insert) = ? AND';
+			$params[] = $filter['month'];
+		}
+
+		if(strlen($filter['day'] ?? '') !== 0) {
+			$extend[] = 'DAY(time_insert) = ? AND';
+			$params[] = $filter['day'];
+		}
+
+		$dateparts = implode(' ', $extend ?? []);
+
+		$query = 'SELECT * FROM %s WHERE %s MATCH(name, body)
+			AGAINST(? IN BOOLEAN MODE) LIMIT 20';
+		$query = sprintf($query, static::getTableName(), $dateparts);
+
+		$Statement = $this->Database->prepare($query);
+		$Statement->execute(array_merge($params ?? [], [$search]));
+
+		if($entities = $Statement->fetchAll($this->Database::FETCH_CLASS, static::getClassName())) {
+			$this->storeMultipleInstances($entities);
+			return $entities;
+		}
+
+		return [];
+	}
+
+	#===============================================================================
+	# Get a list of distinct days
+	#===============================================================================
+	public function getDistinctDays(): array {
+		$query = 'SELECT DISTINCT DAY(time_insert) AS d FROM %s ORDER BY d';
+		$query = sprintf($query, static::getTableName());
+
+		$Statement = $this->Database->query($query);
+
+		if($result = $Statement->fetchAll($this->Database::FETCH_COLUMN)) {
+			return $result;
+		}
+
+		return [];
+	}
+
+	#===============================================================================
+	# Get a list of distinct months
+	#===============================================================================
+	public function getDistinctMonths(): array {
+		$query = 'SELECT DISTINCT MONTH(time_insert) AS m FROM %s ORDER BY m';
+		$query = sprintf($query, static::getTableName());
+
+		$Statement = $this->Database->query($query);
+
+		if($result = $Statement->fetchAll($this->Database::FETCH_COLUMN)) {
+			return $result;
+		}
+
+		return [];
+	}
+
+	#===============================================================================
+	# Get a list of distinct years
+	#===============================================================================
+	public function getDistinctYears(): array {
+		$query = 'SELECT DISTINCT YEAR(time_insert) AS y FROM %s ORDER BY y';
+		$query = sprintf($query, static::getTableName());
+
+		$Statement = $this->Database->query($query);
+
+		if($result = $Statement->fetchAll($this->Database::FETCH_COLUMN)) {
+			return $result;
+		}
+
+		return [];
+	}
+}
diff --git a/core/namespace/User/Attribute.php b/core/namespace/User/Attribute.php
deleted file mode 100644
index ccd31b5..0000000
--- a/core/namespace/User/Attribute.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-namespace User;
-
-class Attribute extends \Attribute {
-
-	#===============================================================================
-	# Pre-Define database table columns
-	#===============================================================================
-	protected $id       = FALSE;
-	protected $slug     = FALSE;
-	protected $username = FALSE;
-	protected $password = FALSE;
-	protected $fullname = FALSE;
-	protected $mailaddr = FALSE;
-	protected $body     = FALSE;
-	protected $argv     = FALSE;
-	protected $time_insert = FALSE;
-	protected $time_update = FALSE;
-
-	#===============================================================================
-	# Define database table name
-	#===============================================================================
-	const TABLE = 'user';
-}
diff --git a/core/namespace/User/Entity.php b/core/namespace/User/Entity.php
new file mode 100644
index 0000000..fdfaf9e
--- /dev/null
+++ b/core/namespace/User/Entity.php
@@ -0,0 +1,15 @@
+<?php
+namespace User;
+
+class Entity extends \Entity {
+	protected $id       = FALSE;
+	protected $slug     = FALSE;
+	protected $username = FALSE;
+	protected $password = FALSE;
+	protected $fullname = FALSE;
+	protected $mailaddr = FALSE;
+	protected $body     = FALSE;
+	protected $argv     = FALSE;
+	protected $time_insert = FALSE;
+	protected $time_update = FALSE;
+}
diff --git a/core/namespace/User/Exception.php b/core/namespace/User/Exception.php
deleted file mode 100644
index fdbe733..0000000
--- a/core/namespace/User/Exception.php
+++ /dev/null
@@ -1,4 +0,0 @@
-<?php
-namespace User;
-
-class Exception extends \Exception {}
diff --git a/core/namespace/User/Factory.php b/core/namespace/User/Factory.php
deleted file mode 100644
index 81930e6..0000000
--- a/core/namespace/User/Factory.php
+++ /dev/null
@@ -1,8 +0,0 @@
-<?php
-namespace User;
-
-class Factory extends \ItemFactory {
-	public static function buildByUsername($username): \Item {
-		return self::build(Item::getIDByField('username', $username, \Application::getDatabase()));
-	}
-}
diff --git a/core/namespace/User/Item.php b/core/namespace/User/Item.php
deleted file mode 100644
index 5039287..0000000
--- a/core/namespace/User/Item.php
+++ /dev/null
@@ -1,6 +0,0 @@
-<?php
-namespace User;
-
-class Item extends \Item {
-	const CONFIGURATION = 'USER';
-}
diff --git a/core/namespace/User/Repository.php b/core/namespace/User/Repository.php
new file mode 100644
index 0000000..59205b3
--- /dev/null
+++ b/core/namespace/User/Repository.php
@@ -0,0 +1,7 @@
+<?php
+namespace User;
+
+class Repository extends \Repository {
+	public static function getTableName(): string { return 'user'; }
+	public static function getClassName(): string { return 'User\Entity'; }
+}