diff --git a/Readme.md b/Readme.md
index aab6d10..f2c9f89 100644
--- a/Readme.md
+++ b/Readme.md
@@ -28,7 +28,7 @@ Database Abstraction Layer
     ...
     "require": {
         ...
-        "provm/database": "^2.0"
+        "provm/database": "^2.3"
         ...
     },
     ...
@@ -41,13 +41,13 @@ For `MySQL`/`MariaDB`
 
 Without `DI`
 ```
-$database new MySQL();
+$database new ProVM\Database\MySQL();
 $database->setHost(<host>);
 $database->setPort(<port>); // If diferent from 3306
 $database->setUsername(<username>);
 $database->setPassword(<password>);
 
-$connection = new Connection($database);
+$connection = new ProVM\Database\Connection($database);
 ```
 With `DI`
 ```
@@ -76,8 +76,20 @@ $rs = $connection->execute(<query>, <values>);
 ```
 Get data from ResultSet
 ```
-$data = $rs->getAsArray();
-$data_objs = $rs->getAsObject();
+$data = $rs->fetchFirst();
+$data_object = $rs->fetchFirstAsObject();
+$data_array = $rs->fetchAll();
+$data_array_of_objects = $rs->fetchAllAsObjects();
+```
+Use transactions
+```
+$connection->transaction()->begin();
+try {
+    $connection->execute($query, $values);
+    $connection->transaction()->commit();
+} catch (PDOException $exception) {
+    $connection->transaction()->rollBack();
+}
 ```
 
 ## Definitions
@@ -97,23 +109,20 @@ Connection handling
 + `Connection::query` Query the database
 + `Connection::prepare` Prepare query statement
 + `Connection::execute` Prepare and execute a query statement
-+ `Conneciton::transaction` Return a transaction
++ `Connection::transaction` Return a transaction
 
 ### Transaction
 Transaction
 + `Transaction::begin` Begin transaction
 + `Transaction::commit` Commit changes
 + `Transaction::rollBack` Roll back changes
-+ `Transaction::query` Same as `Connection::query`
-+ `Transaction::prepare` Same as `Connection::prepare`
-+ `Transaction::execute` Same as `Connection::execute`
 
 ### ResultSet
 Result set to handle PDOStatement
 + `ResultSet::execute` Execute a prepared statement
-+ `ResultSet::getAsArray` Return query results as array of associative arrays
-+ `ResultSet::getAsObject` Return query results as array of objects
-+ `ResultSet::getFirst` Return first result as object
++ `ResultSet::fetchAll` Return query results as array of associative arrays
++ `ResultSet::fetchAllAsObjects` Return query results as array of objects
++ `ResultSet::fetchFirst` Return first result as associative array
++ `ResultSet::fetchFirstAsObject` Return first result as object
 
 ## TODO
-+ Implement other database types. eg: PostgreSQL, SQLite
diff --git a/composer.json b/composer.json
index e70f7c1..85a3f71 100644
--- a/composer.json
+++ b/composer.json
@@ -1,17 +1,20 @@
 {
     "name": "provm/database",
-    "type": "project",
-    "require-dev": {
-        "phpunit/phpunit": "^9.5",
-        "kint-php/kint": "^4.2"
-    },
+    "type": "library",
     "authors": [
         {
             "name": "Aldarien",
             "email": "aldarien85@gmail.com"
         }
     ],
-    "require": {},
+    "require": {
+        "php": ">=8",
+        "ext-pdo": "*"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^10.0",
+        "kint-php/kint": "^5.0"
+    },
     "autoload": {
         "psr-4": {
             "ProVM\\": "src/"
diff --git a/src/Alias/Database.php b/src/Alias/Database.php
deleted file mode 100644
index 8ece3db..0000000
--- a/src/Alias/Database.php
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php
-namespace ProVM\Alias;
-
-use ProVM\Concept\Database as DatabaseInterface;
-
-abstract class Database implements DatabaseInterface
-{
-    protected string $host;
-    public function setHost(string $host): DatabaseInterface
-    {
-        $this->host = $host;
-        return $this;
-    }
-    public function getHost(): string
-    {
-        return $this->host;
-    }
-    protected int $port;
-    public function setPort(int $port): DatabaseInterface
-    {
-        $this->port = $port;
-        return $this;
-    }
-    public function getPort(): int
-    {
-        return $this->port;
-    }
-    protected string $name;
-    public function setName(string $name): DatabaseInterface
-    {
-        $this->name = $name;
-        return $this;
-    }
-    public function getName(): string
-    {
-        return $this->name;
-    }
-    protected string $username;
-    public function setUsername(string $username): DatabaseInterface
-    {
-        $this->username = $username;
-        return $this;
-    }
-    public function getUsername(): string
-    {
-        return $this->username;
-    }
-    protected string $password;
-    public function setPassword(string $password): DatabaseInterface
-    {
-        $this->password = $password;
-        return $this;
-    }
-    public function getPassword(): string
-    {
-        return $this->password;
-    }
-}
diff --git a/src/Concept/Database.php b/src/Concept/Database.php
index 0ed1e0d..bc9f2a9 100644
--- a/src/Concept/Database.php
+++ b/src/Concept/Database.php
@@ -1,20 +1,18 @@
 <?php
 namespace ProVM\Concept;
 
-use PDO;
-
 interface Database
 {
-    public function setHost(string $host): Database;
     public function getHost(): string;
-    public function setPort(int $port): Database;
-    public function getPort(): int;
-    public function setName(string $name): Database;
+    public function getPort(): int|bool;
     public function getName(): string;
-    public function setUsername(string $username): Database;
-    public function getUsername(): string;
-    public function setPassword(string $password): Database;
+    public function getUser(): string;
     public function getPassword(): string;
     public function needsUser(): bool;
-    public function getDSN(): string;
+    public function setHost(string $host): Database;
+    public function setPort(int $port): Database;
+    public function setName(string $name): Database;
+    public function setUser(string $username): Database;
+    public function setPassword(string $password): Database;
+    public function getDsn(): string;
 }
diff --git a/src/Concept/Database/Connection.php b/src/Concept/Database/Connection.php
index 1f37c8b..705400d 100644
--- a/src/Concept/Database/Connection.php
+++ b/src/Concept/Database/Connection.php
@@ -1,18 +1,15 @@
 <?php
 namespace ProVM\Concept\Database;
 
-use PDO;
 use ProVM\Concept\Database;
 
 interface Connection
 {
-    public function setDatabase(Database $database): Connection;
-    public function getDatabase(): Database;
-    public function connect(): Connection;
-    public function setPDO(PDO $pdo): Connection;
-    public function getPDO(): PDO;
+    public function connect(): \PDO;
+
+    public function transaction(): Transaction;
+
     public function query(string $query): ResultSet;
     public function prepare(string $query): ResultSet;
-    public function execute(string $query, array $values): ResultSet;
-    public function transaction(): Transaction;
+    public function execute(string $query, ?array $data = null): ResultSet;
 }
diff --git a/src/Concept/Database/ResultSet.php b/src/Concept/Database/ResultSet.php
index df7bf0b..4c744b2 100644
--- a/src/Concept/Database/ResultSet.php
+++ b/src/Concept/Database/ResultSet.php
@@ -1,14 +1,12 @@
 <?php
 namespace ProVM\Concept\Database;
 
-use PDOStatement;
-
 interface ResultSet
 {
-    public function __construct(PDOStatement $statement);
-    public function execute(array $values): ResultSet;
-    public function getAsArray(): array;
-    public function getAsObject(): array;
-    public function getFirstAsArray(): array;
-    public function getFirstAsObject(): object;
+    public function execute(array $data): ResultSet;
+
+    public function fetchFirst(): array;
+    public function fetchAll(): array;
+    public function fetchFirstAsObject(): object;
+    public function fetchAllAsObjects(): array;
 }
diff --git a/src/Concept/Database/Transaction.php b/src/Concept/Database/Transaction.php
index b3fa0e9..bd76772 100644
--- a/src/Concept/Database/Transaction.php
+++ b/src/Concept/Database/Transaction.php
@@ -4,9 +4,6 @@ namespace ProVM\Concept\Database;
 interface Transaction
 {
     public function begin(): Transaction;
-    public function query(string $query): ResultSet;
-    public function prepare(string $query): ResultSet;
-    public function execute(string $query, array $values): ResultSet;
     public function commit(): void;
     public function rollBack(): void;
 }
diff --git a/src/Database/Connection.php b/src/Database/Connection.php
index 0e5c8f3..934eba4 100644
--- a/src/Database/Connection.php
+++ b/src/Database/Connection.php
@@ -2,74 +2,67 @@
 namespace ProVM\Database;
 
 use PDO;
-use PDOException;
 use ProVM\Concept\Database;
-use ProVM\Concept\Database\Connection as ConnectionInterface;
-use ProVM\Concept\Database\ResultSet as ResultSetInterface;
-use ProVM\Concept\Database\Transaction as TransactionInterface;
 
-class Connection implements ConnectionInterface
+class Connection implements Database\Connection
 {
     public function __construct(Database $database)
     {
         $this->setDatabase($database);
-        $this->connect();
     }
 
     protected Database $database;
-    public function setDatabase(Database $database): ConnectionInterface
+
+    protected function getDatabase(): Database
+    {
+        return $this->database;
+    }
+
+    protected function setDatabase(Database $database): Database\Connection
     {
         $this->database = $database;
         return $this;
     }
-    public function getDatabase(): Database
-    {
-        return $this->database;
-    }
-    public function connect(): ConnectionInterface
+
+    protected PDO $pdo;
+    public function connect(): PDO
     {
         if (!isset($this->pdo)) {
+            $dsn = $this->getDatabase()->getDsn();
             if ($this->getDatabase()->needsUser()) {
-                $pdo = new PDO($this->getDatabase()->getDSN(), $this->getDatabase()->getUsername(), $this->getDatabase()->getPassword());
+                $this->pdo = new PDO($dsn, $this->getDatabase()->getUser(), $this->getDatabase()->getPassword());
             } else {
-                $pdo = new PDO($this->getDatabase()->getDSN());
+                $this->pdo = new PDO($dsn);
             }
-            $this->setPDO($pdo);
         }
-        return $this;
-    }
-    protected PDO $pdo;
-    public function setPDO(PDO $pdo): ConnectionInterface
-    {
-        $this->pdo = $pdo;
-        return $this;
-    }
-    public function getPDO(): PDO
-    {
         return $this->pdo;
     }
-    public function query(string $query): ResultSetInterface
+
+    protected Database\Transaction $transaction;
+
+    public function transaction(): Database\Transaction
     {
-        $st = $this->getPDO()->query($query);
-        if (!$st) {
-            throw new PDOException("Could not run query {$query}");
+        if (!isset($this->transaction)) {
+            $this->transaction = new Transaction($this);
         }
-        return new ResultSet($st);
+        return $this->transaction;
     }
-    public function prepare(string $query): ResultSetInterface
+
+    public function query(string $query): Database\ResultSet
     {
-        $st = $this->getPDO()->prepare($query);
-        if (!$st) {
-            throw new PDOException("Could not prepare query {$query}");
+        return new ResultSet($this->connect()->query($query));
+    }
+    public function prepare(string $query): Database\ResultSet
+    {
+        return new ResultSet($this->connect()->prepare($query));
+    }
+    public function execute(string $query, ?array $data = null): Database\ResultSet
+    {
+        if ($data !== null) {
+            $rs = $this->prepare($query);
+            $rs->execute($data);
+            return $rs;
         }
-        return new ResultSet($st);
-    }
-    public function execute(string $query, array $values): ResultSetInterface
-    {
-        return $this->prepare($query)->execute($values);
-    }
-    public function transaction(): TransactionInterface
-    {
-        return new Transaction($this->getPDO());
+        return $this->query($query);
     }
 }
diff --git a/src/Database/MySQL.php b/src/Database/MySQL.php
index 9836747..a4e009f 100644
--- a/src/Database/MySQL.php
+++ b/src/Database/MySQL.php
@@ -1,7 +1,7 @@
 <?php
 namespace ProVM\Database;
 
-use ProVM\Alias\Database;
+use ProVM\Implement\Database;
 
 class MySQL extends Database
 {
@@ -9,20 +9,13 @@ class MySQL extends Database
     {
         return true;
     }
-
-    public function getDSN(): string
+    public function getDsn(): string
     {
-        $arr = [
-            "host={$this->getHost()}"
-        ];
-        if (isset($this->port)) {
-            $arr []= "port={$this->getPort()}";
+        $dsn = ["mysql:host={$this->getHost()}"];
+        if ($this->getPort()) {
+            $dsn []= "port={$this->getPort()}";
         }
-        $arr []= "dbname={$this->getName()}";
-
-        return implode(':', [
-            'mysql',
-            implode(';', $arr)
-        ]);
+        $dsn []= "dbname={$this->getName()}";
+        return implode(';', $dsn);
     }
 }
diff --git a/src/Database/PostgreSQL.php b/src/Database/PostgreSQL.php
new file mode 100644
index 0000000..fc83fe6
--- /dev/null
+++ b/src/Database/PostgreSQL.php
@@ -0,0 +1,19 @@
+<?php
+namespace ProVM\Database;
+
+use ProVM\Implement\Database;
+
+class PostgreSQL extends Database
+{
+    public function getDsn(): string
+    {
+        $dsn = ["pgsql:host={$this->getHost()}"];
+        if ($this->getPort()) {
+            $dsn []= "port={$this->getPort()}";
+        }
+        $dsn []= "dbname={$this->getName()}";
+        $dsn []= "user={$this->getUser()}";
+        $dsn []= "password={$this->getPassword()}";
+        return implode(';', $dsn);
+    }
+}
diff --git a/src/Database/ResultSet.php b/src/Database/ResultSet.php
index 6654eb7..d357ffc 100644
--- a/src/Database/ResultSet.php
+++ b/src/Database/ResultSet.php
@@ -3,10 +3,10 @@ namespace ProVM\Database;
 
 use PDO;
 use PDOStatement;
-use ProVM\Concept\Database\ResultSet as RSInterface;
-use ProVM\Exception\BlankResult;
+use ProVM\Concept\Database;
+use ProVM\Exception\Database\BlankResult;
 
-class ResultSet implements RSInterface
+class ResultSet implements Database\ResultSet
 {
     public function __construct(PDOStatement $statement)
     {
@@ -14,52 +14,44 @@ class ResultSet implements RSInterface
     }
 
     protected PDOStatement $statement;
-    public function setStatement(PDOStatement $statement): RSInterface
+
+    protected function getStatement(): PDOStatement
+    {
+        return $this->statement;
+    }
+    protected function setStatement(PDOStatement $statement): ResultSet
     {
         $this->statement = $statement;
         return $this;
     }
-    public function getStatement(): PDOStatement
-    {
-        return $this->statement;
-    }
 
-    public function execute(array $values): RSInterface
+    public function execute(array $data): Database\ResultSet
     {
-        $this->getStatement()->execute($values);
+        $this->statement->execute($data);
         return $this;
     }
 
-    public function getAsArray(): array
+    protected function checkResults(): PDOStatement
     {
-        $rs = $this->getStatement()->fetchAll(PDO::FETCH_ASSOC);
-        if (!$rs) {
-            throw new BlankResult();
+        if ($this->getStatement()->rowCount() === 0) {
+            throw new BlankResult(query: $this->getStatement()->queryString);
         }
-        return $rs;
+        return $this->getStatement();
     }
-    public function getAsObject(): array
+    public function fetchFirst(): array
     {
-        $rs = $this->getStatement()->fetchAll(PDO::FETCH_OBJ);
-        if (!$rs) {
-            throw new BlankResult();
-        }
-        return $rs;
+        return $this->checkResults()->fetch(PDO::FETCH_ASSOC);
     }
-    public function getFirstAsArray(): array
+    public function fetchAll(): array
     {
-        $rs = $this->getStatement()->fetch(PDO::FETCH_ASSOC);
-        if (!$rs or count($rs) === 0) {
-            throw new BlankResult();
-        }
-        return $rs;
+        return $this->checkResults()->fetchAll(PDO::FETCH_ASSOC);
     }
-    public function getFirstAsObject(): object
+    public function fetchFirstAsObject(): object
     {
-        $rs = $this->getStatement()->fetch(PDO::FETCH_OBJ);
-        if (!$rs or count($rs) === 0) {
-            throw new BlankResult();
-        }
-        return $rs;
+        return $this->checkResults()->fetch(PDO::FETCH_OBJ);
+    }
+    public function fetchAllAsObjects(): array
+    {
+        return $this->checkResults()->fetchAll(PDO::FETCH_OBJ);
     }
 }
diff --git a/src/Database/SQLite.php b/src/Database/SQLite.php
new file mode 100644
index 0000000..f8ab299
--- /dev/null
+++ b/src/Database/SQLite.php
@@ -0,0 +1,12 @@
+<?php
+namespace ProVM\Database;
+
+use ProVM\Implement\Database;
+
+class SQLite extends Database
+{
+    public function getDsn(): string
+    {
+        return "sqlite:{$this->getHost()}";
+    }
+}
diff --git a/src/Database/Transaction.php b/src/Database/Transaction.php
index 7901640..3181903 100644
--- a/src/Database/Transaction.php
+++ b/src/Database/Transaction.php
@@ -2,58 +2,39 @@
 namespace ProVM\Database;
 
 use PDO;
-use PDOException;
-use ProVM\Concept\Database\ResultSet as ResultSetInterface;
-use ProVM\Concept\Database\Transaction as TransactionInterface;
+use ProVM\Concept;
 
-class Transaction implements TransactionInterface
+class Transaction implements Concept\Database\Transaction
 {
-    public function __construct(PDO $pdo)
+    public function __construct(Concept\Database\Connection $connection)
     {
-        $this->setPDO($pdo);
+        $this->setConnection($connection);
     }
 
-    protected PDO $pdo;
-    public function setPDO(PDO $pdo): TransactionInterface
+    protected Concept\Database\Connection $connection;
+
+    public function getConnection(): Concept\Database\Connection
     {
-        $this->pdo = $pdo;
+        return $this->connection;
+    }
+
+    public function setConnection(Concept\Database\Connection $connection): Concept\Database\Transaction
+    {
+        $this->connection = $connection;
         return $this;
     }
-    public function getPDO(): PDO
+
+    public function begin(): Concept\Database\Transaction
     {
-        return $this->pdo;
-    }
-    public function begin(): TransactionInterface
-    {
-        $this->getPDO()->beginTransaction();
+        $this->getConnection()->connect()->beginTransaction();
         return $this;
     }
-    public function query(string $query): ResultSetInterface
-    {
-        $st = $this->getPDO()->query($query);
-        if (!$st) {
-            throw new PDOException("Could not run query {$query}");
-        }
-        return new ResultSet($st);
-    }
-    public function prepare(string $query): ResultSetInterface
-    {
-        $st = $this->getPDO()->prepare($query);
-        if (!$st) {
-            throw new PDOException("Could not prepare query {$query}");
-        }
-        return new ResultSet($st);
-    }
-    public function execute(string $query, array $values): ResultSetInterface
-    {
-        return $this->prepare($query)->execute($values);
-    }
     public function commit(): void
     {
-        $this->getPDO()->commit();
+        $this->getConnection()->connect()->commit();
     }
     public function rollBack(): void
     {
-        $this->getPDO()->rollBack();
+        $this->getConnection()->connect()->rollBack();
     }
 }
diff --git a/src/Exception/BlankResult.php b/src/Exception/BlankResult.php
deleted file mode 100644
index 09fb226..0000000
--- a/src/Exception/BlankResult.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-namespace ProVM\Exception;
-
-use ProVM\Database\Exception;
-use Throwable;
-
-class BlankResult extends Exception
-{
-    public function __construct(?Throwable $previous = null)
-    {
-        $message = "No results found";
-        $code = 0;
-        parent::__construct($message, $code, $previous);
-    }
-}
diff --git a/src/Database/Exception.php b/src/Exception/Database.php
similarity index 51%
rename from src/Database/Exception.php
rename to src/Exception/Database.php
index c71a39a..d1a2759 100644
--- a/src/Database/Exception.php
+++ b/src/Exception/Database.php
@@ -1,11 +1,16 @@
 <?php
-namespace ProVM\Database;
+namespace ProVM\Exception;
 
-class Exception extends \Exception
+use Exception;
+use Throwable;
+
+abstract class Database extends Exception
 {
+    const BASE_CODE = 600;
+
     public function __construct(string $message = "", int $code = 0, ?Throwable $previous = null)
     {
-        $code += 300;
+        $code += Database::BASE_CODE;
         parent::__construct($message, $code, $previous);
     }
 }
diff --git a/src/Exception/Database/BlankResult.php b/src/Exception/Database/BlankResult.php
new file mode 100644
index 0000000..9a2294d
--- /dev/null
+++ b/src/Exception/Database/BlankResult.php
@@ -0,0 +1,20 @@
+<?php
+namespace ProVM\Exception\Database;
+
+use Throwable;
+use ProVM\Exception\Database;
+
+class BlankResult extends Database
+{
+    public function __construct(?string $table = null, ?string $query = null, ?Throwable $previous = null)
+    {
+        $message = implode('', [
+            "No results found",
+            ($query !== null) ? " in {$query}" : '',
+            ($table !== null) ? " in {$table}" : '',
+            '.'
+        ]);
+        $code = 1;
+        parent::__construct($message, $code, $previous);
+    }
+}
diff --git a/src/Implement/Database.php b/src/Implement/Database.php
new file mode 100644
index 0000000..4093c19
--- /dev/null
+++ b/src/Implement/Database.php
@@ -0,0 +1,65 @@
+<?php
+namespace ProVM\Implement;
+
+use ProVM\Concept;
+
+abstract class Database implements Concept\Database
+{
+    protected string $host;
+    protected int $port;
+    protected string $name;
+    protected string $user;
+    protected string $password;
+
+    public function getHost(): string
+    {
+        return $this->host;
+    }
+    public function getPort(): int|bool
+    {
+        return $this->port ?? false;
+    }
+    public function getName(): string
+    {
+        return $this->name;
+    }
+    public function getUser(): string
+    {
+        return $this->user;
+    }
+    public function getPassword(): string
+    {
+        return $this->password;
+    }
+
+    public function setHost(string $host): Concept\Database
+    {
+        $this->host = $host;
+        return $this;
+    }
+    public function setPort(int $port): Concept\Database
+    {
+        $this->port = $port;
+        return $this;
+    }
+    public function setName(string $name): Concept\Database
+    {
+        $this->name = $name;
+        return $this;
+    }
+    public function setUser(string $username): Concept\Database
+    {
+        $this->user = $username;
+        return $this;
+    }
+    public function setPassword(string $password): Concept\Database
+    {
+        $this->password = $password;
+        return $this;
+    }
+
+    public function needsUser(): bool
+    {
+        return false;
+    }
+}