diff --git a/system/database/autoload.php b/system/database/autoload.php
index 1da6f69..5ba3855 100644
--- a/system/database/autoload.php
+++ b/system/database/autoload.php
@@ -6,13 +6,18 @@
  * Phacil PHP Framework - https://github.com/exacti/phacil-framework
  */
 
- 
 namespace Phacil\Framework;
 
+use Phacil\Framework\Interfaces\Databases;
+
+/** 
+ * Principal class to load databases drivers
+ * 
+ * @package Phacil\Framework */
 final class Database {
 	/**
 	 * 
-	 * @var object
+	 * @var Databases
 	 */
 	private $driver;
 	
@@ -23,6 +28,8 @@ final class Database {
 	private $cachePrefix = "SQL_";
 	
 	/**
+	 * Construct the connection.
+	 * 
 	 * @param string $driver 
 	 * @param string $hostname 
 	 * @param string $username 
@@ -42,11 +49,28 @@ public function __construct($driver, $hostname, $username, $password, $database)
         }		
 		
 	}
+
+	/** 
+	 * Check is connected on database
+	 * @return bool  */
+	public function isConnected() { 
+		return $this->driver->isConnected();
+	}
+
+	/** 
+	 * Destroy the connection
+	 * 
+	 * @return void  */
+	public function __destruct() {
+		unset($this->driver);
+	 }
 		
   	/**
+	 * Execute the SQL Query
+	 * 
   	 * @param string $sql 
   	 * @param bool $cacheUse 
-  	 * @return object|\Phacil\Framework\DB::Cache 
+  	 * @return object|\Phacil\Framework\Database::Cache 
   	 * @throws PhpfastcacheInvalidArgumentException 
   	 */
   	public function query($sql, $cacheUse = true) {
@@ -63,19 +87,27 @@ public function query($sql, $cacheUse = true) {
   	}
 	
 	/**
+	 * Important escape to prevent SQL injection.
+	 * 
 	 * @param string $value 
-	 * @return mixed 
+	 * @return string 
 	 */
 	public function escape($value) {
 		return $this->driver->escape($value);
 	}
 	
-  	/** @return int  */
+  	/** 
+	 * Gets the number of rows affected by the last operation
+	 * 
+	 * @return int  */
   	public function countAffected() {
 		return $this->driver->countAffected();
   	}
 
-  	/** @return mixed  */
+  	/** 
+	 * Gets the ID of the last inserted row or sequence of values
+	 * 
+	 * @return int|string  */
   	public function getLastId() {
 		return $this->driver->getLastId();
   	}
@@ -162,12 +194,3 @@ public function createSubBase($nome, $object) {
         $this->$nome = $object;
     }
 }
-
-
-/* if(defined('DB_DRIVER')) {
-    global $db;
-    $db = new Phacil\Framework\DB(DB_DRIVER, DB_HOSTNAME, DB_USERNAME, DB_PASSWORD, DB_DATABASE);
-} else {
-    global $db;
-    $db = new Phacil\Framework\DB('nullStatement', NULL, NULL, NULL, NULL);
-} */
diff --git a/system/database/databases/mpdo.php b/system/database/databases/mpdo.php
index 34822db..97b3177 100644
--- a/system/database/databases/mpdo.php
+++ b/system/database/databases/mpdo.php
@@ -9,12 +9,13 @@
 namespace Phacil\Framework\Databases;
 
 use PDO;
+use Phacil\Framework\Interfaces\Databases;
 
 /** 
  * Alternative PDO MySQL connection method.
  * 
  * @package Phacil\Framework\Databases */
-final class mPDO {
+final class mPDO implements Databases {
 	/**
 	 * 
 	 * @var PDO
diff --git a/system/database/databases/mssql.php b/system/database/databases/mssql.php
index b557417..f0c8083 100644
--- a/system/database/databases/mssql.php
+++ b/system/database/databases/mssql.php
@@ -13,80 +13,91 @@
  * 
  * Doesn't work with PHP 7+
  * @package Phacil\Framework\Databases */
-final class MSSQL {
+final class MSSQL implements \Phacil\Framework\Interfaces\Databases
+{
 	private $connection;
-	
-	public function __construct($hostname, $username, $password, $database, $port = '1443', $charset = 'utf8') {
+
+	public function __construct($hostname, $username, $password, $database, $port = '1443', $charset = 'utf8')
+	{
 		if (!$this->connection = mssql_connect($hostname, $username, $password)) {
-      		exit('Error: Could not make a database connection using ' . $username . '@' . $hostname);
-    	}
+			exit('Error: Could not make a database connection using ' . $username . '@' . $hostname);
+		}
+
+		if (!mssql_select_db($database, $this->connection)) {
+			exit('Error: Could not connect to database ' . $database);
+		}
 
-    	if (!mssql_select_db($database, $this->connection)) {
-      		exit('Error: Could not connect to database ' . $database);
-    	}
-		
 		mssql_query("SET NAMES 'utf8'", $this->connection);
 		mssql_query("SET CHARACTER SET utf8", $this->connection);
 		mssql_query("SET CHARACTER_SET_CONNECTION=utf8", $this->connection);
-  	}
-		
-  	public function query($sql) {
+	}
+
+	public function query($sql)
+	{
 		$resource = mssql_query($sql, $this->connection);
 
 		if ($resource) {
 			if (is_resource($resource)) {
 				$i = 0;
-    	
+
 				$data = array();
-		
+
 				while ($result = mssql_fetch_assoc($resource)) {
 					$data[$i] = $result;
-    	
+
 					$i++;
 				}
-				
+
 				mssql_free_result($resource);
-				
+
 				$query = new stdClass();
 				$query->row = isset($data[0]) ? $data[0] : array();
 				$query->rows = $data;
 				$query->num_rows = $i;
-				
+
 				unset($data);
 
-				return $query;	
-    		} else {
+				return $query;
+			} else {
 				return true;
 			}
 		} else {
 			trigger_error('Error: ' . mssql_get_last_message($this->connection) . '<br />' . $sql);
-      		exit();
-    	}
-  	}
-	
-	public function escape($value) {
+			exit();
+		}
+	}
+
+	public function escape($value)
+	{
 		return mssql_real_escape_string($value, $this->connection);
 	}
-	
-  	public function countAffected() {
-    	return mssql_rows_affected($this->connection);
-  	}
 
-  	public function getLastId() {
+	public function countAffected()
+	{
+		return mssql_rows_affected($this->connection);
+	}
+
+	public function getLastId()
+	{
 		$last_id = false;
-		
+
 		$resource = mssql_query("SELECT @@identity AS id", $this->connection);
-		
+
 		if ($row = mssql_fetch_row($resource)) {
 			$last_id = trim($row[0]);
 		}
-		
+
 		mssql_free_result($resource);
-		
+
 		return $last_id;
-  	}	
-	
-	public function __destruct() {
+	}
+
+	function isConnected()
+	{
+	}
+
+	public function __destruct()
+	{
 		mssql_close($this->connection);
 	}
 }
diff --git a/system/database/databases/mysql_legacy.php b/system/database/databases/mysql_legacy.php
index d0e28ae..12504f6 100644
--- a/system/database/databases/mysql_legacy.php
+++ b/system/database/databases/mysql_legacy.php
@@ -14,7 +14,7 @@
  * Doesn't work with PHP 7+
  * @package Phacil\Framework\Databases 
  * */
-final class MySQL_legacy {
+final class MySQL_legacy implements \Phacil\Framework\Interfaces\Databases {
 	private $connection;
 	
 	public function __construct($hostname, $username, $password, $database, $port = '3306', $charset = 'utf8') {
@@ -31,6 +31,8 @@ public function __construct($hostname, $username, $password, $database, $port =
 		mysql_query("SET CHARACTER_SET_CONNECTION=".$charset."", $this->connection);
 		mysql_query("SET SQL_MODE = ''", $this->connection);
   	}
+
+	public function isConnected() { }
 		
   	public function query($sql) {
 		$resource = mysql_query($sql, $this->connection);
diff --git a/system/database/databases/mysql_pdo.php b/system/database/databases/mysql_pdo.php
index 4674e2a..0b3e2d4 100644
--- a/system/database/databases/mysql_pdo.php
+++ b/system/database/databases/mysql_pdo.php
@@ -8,7 +8,9 @@
 
 namespace Phacil\Framework\Databases;
 
-final class MYSQL_PDO
+use Phacil\Framework\Interfaces\Databases;
+
+final class MYSQL_PDO implements Databases
 {
     /**
      * Link to the database connection
@@ -59,6 +61,14 @@ public function __construct($host, $user, $pass, $name, $port = '3306', $charset
         $this->options['PDO::MYSQL_ATTR_INIT_COMMAND'] = "SET NAMES '{$charset}'";
         $this->connect();
     }
+
+    public function isConnected() { 
+        if ($this->dbh) {
+			return true;
+		} else {
+			return false;
+		}
+    }
     /**
      * Connect to database
      */
diff --git a/system/database/databases/mysqli.php b/system/database/databases/mysqli.php
index 74baa80..176aef1 100644
--- a/system/database/databases/mysqli.php
+++ b/system/database/databases/mysqli.php
@@ -10,6 +10,7 @@
 
 use Exception;
 use MySQLi as GlobalMysqli;
+use Phacil\Framework\Interfaces\Databases;
 use stdClass;
 
 /** 
@@ -18,7 +19,7 @@
  * Works on most of PHP instalations 
  * 
  * @package Phacil\Framework\Databases */
-class MySQLi {
+class MySQLi implements Databases {
 	/**
 	 * 
 	 * @var GlobalMysqli
diff --git a/system/database/databases/nullStatement.php b/system/database/databases/nullStatement.php
index 0cd6f7b..800a59d 100644
--- a/system/database/databases/nullStatement.php
+++ b/system/database/databases/nullStatement.php
@@ -8,18 +8,25 @@
 
 namespace Phacil\Framework\Databases;
 
+use Phacil\Framework\Interfaces\Databases;
+
 /**
  * Nullable fake simulated DB connection.
  * 
  * @package Phacil\Framework\Databases
  */
-final class nullStatement {
+final class nullStatement implements Databases {
     //private $connection;
 
     public function __construct($hostname, $username, $password, $database, $charset = 'utf8mb4') {
         //$this->connection = NULL;
     }
 
+    public function isConnected() { 
+
+        return false;
+    }
+
     public function query($sql) {
         $result = new \stdClass();
         $result->num_rows = NULL;
diff --git a/system/database/databases/oracle.php b/system/database/databases/oracle.php
index 8138684..0795b12 100644
--- a/system/database/databases/oracle.php
+++ b/system/database/databases/oracle.php
@@ -9,6 +9,7 @@
 namespace Phacil\Framework\Databases;
 
 use Exception;
+use Phacil\Framework\Interfaces\Databases;
 use stdClass;
 
 /**
@@ -16,7 +17,7 @@
  * 
  * @package Phacil\Framework\Databases
  */
-final class Oracle{
+final class Oracle implements Databases {
 	/**
 	 * 
 	 * @var resource|false
diff --git a/system/database/databases/postgre.php b/system/database/databases/postgre.php
index ac9e5f6..e8b4626 100644
--- a/system/database/databases/postgre.php
+++ b/system/database/databases/postgre.php
@@ -8,7 +8,9 @@
 
 namespace Phacil\Framework\Databases;
 
-final class Postgre {
+use Phacil\Framework\Interfaces\Databases;
+
+final class Postgre implements Databases {
 	/**
 	 * 
 	 * @var resource|false
@@ -36,6 +38,10 @@ public function __construct($hostname, $username, $password, $database, $port =
 		pg_query($this->link, "SET CLIENT_ENCODING TO '".$charset."'");
 	}
 
+	public function isConnected() { 
+		return ($this->link) ? true : false;
+	}
+
 	/**
 	 * @param string $sql 
 	 * @return stdClass|true 
diff --git a/system/database/databases/sqlite3_db.php b/system/database/databases/sqlite3_db.php
index ec4c7f9..a05c9a1 100644
--- a/system/database/databases/sqlite3_db.php
+++ b/system/database/databases/sqlite3_db.php
@@ -9,10 +9,11 @@
 namespace Phacil\Framework\Databases;
 
 use Exception;
+use Phacil\Framework\Interfaces\Databases;
 use \SQLite3;
 use stdClass;
 
-final class Sqlite3_db {
+final class Sqlite3_db implements Databases {
     /**
      * 
      * @var SQLite3
diff --git a/system/database/databases/sqlsrv.php b/system/database/databases/sqlsrv.php
index fcbc664..09141ee 100644
--- a/system/database/databases/sqlsrv.php
+++ b/system/database/databases/sqlsrv.php
@@ -8,9 +8,10 @@
 
 namespace Phacil\Framework\Databases;
 
+use Phacil\Framework\Interfaces\Databases;
 use \stdClass;
 
-final class SQLSRV {
+final class SQLSRV implements Databases {
     /**
      * 
      * @var resource
@@ -50,6 +51,10 @@ public function __construct($hostname, $username, $password, $database, $port =
         sqlsrv_query($this->link, "SET CHARACTER SET utf8");
     }
 
+    public function isConnected() {
+        return ($this->link) ? true : false;
+    }
+
     /**
      * @param string $sql 
      * @return stdClass|true 
diff --git a/system/database/databases/sqlsrvpdo.php b/system/database/databases/sqlsrvpdo.php
index ddfa80e..08de3a7 100644
--- a/system/database/databases/sqlsrvpdo.php
+++ b/system/database/databases/sqlsrvpdo.php
@@ -10,9 +10,10 @@
 
 use Exception;
 use \PDO as PDONative;
+use Phacil\Framework\Interfaces\Databases;
 use stdClass;
 
-final class sqlsrvPDO {
+final class sqlsrvPDO implements Databases {
     /**
      * 
      * @var PDONative
diff --git a/system/database/library/db.php b/system/database/library/db.php
deleted file mode 100644
index 8add049..0000000
--- a/system/database/library/db.php
+++ /dev/null
@@ -1,163 +0,0 @@
-<?php
-/*
- * Copyright © 2021 ExacTI Technology Solutions. All rights reserved.
- * GPLv3 General License.
- * https://exacti.com.br
- * Phacil PHP Framework - https://github.com/exacti/phacil-framework
- */
-
-namespace Phacil\Framework;
-
-use Phpfastcache\Exceptions\PhpfastcacheInvalidArgumentException;
-
-/** @package Phacil\Framework */
-final class DB {
-	/**
-	 * 
-	 * @var object
-	 */
-	private $driver;
-	
-	/**
-	 * 
-	 * @var string
-	 */
-	private $cachePrefix = "SQL_";
-	
-	/**
-	 * @param string $driver 
-	 * @param string $hostname 
-	 * @param string $username 
-	 * @param string $password 
-	 * @param string $database 
-	 * @return void 
-	 */
-	public function __construct($driver, $hostname, $username, $password, $database) {
-		if (file_exists(DIR_DATABASE .'database/'. $driver . '.php')) {
-			require_once(DIR_DATABASE .'database/'. $driver . '.php');
-		} else {
-			exit('Error: Could not load database file ' . $driver . '!');
-		}
-				
-		$this->driver = new $driver($hostname, $username, $password, $database);
-	}
-		
-  	/**
-  	 * @param string $sql 
-  	 * @param bool $cacheUse 
-  	 * @return object|\Phacil\Framework\DB::Cache 
-  	 * @throws PhpfastcacheInvalidArgumentException 
-  	 */
-  	public function query($sql, $cacheUse = true) {
-		
-		if(defined('SQL_CACHE') && SQL_CACHE == true && $cacheUse == true) {
-			
-			return $this->Cache($sql);
-			
-		} else {
-			
-			return $this->driver->query($sql);
-		}		
-		
-  	}
-	
-	/**
-	 * @param string $value 
-	 * @return mixed 
-	 */
-	public function escape($value) {
-		return $this->driver->escape($value);
-	}
-	
-  	/** @return int  */
-  	public function countAffected() {
-		return $this->driver->countAffected();
-  	}
-
-  	/** @return mixed  */
-  	public function getLastId() {
-		return $this->driver->getLastId();
-  	}
-
-    /**
-     * @param string $sql 
-     * @param int $pageNum_exibe 
-     * @param int $maxRows_exibe 
-     * @param bool $cache 
-     * @param mixed|null $sqlTotal 
-     * @return object 
-     * @throws PhpfastcacheInvalidArgumentException 
-     */
-    public function pagination($sql, $pageNum_exibe = 1, $maxRows_exibe = 10, $cache = true, $sqlTotal = null){
-
-        if (($pageNum_exibe >= 1)) {
-            $pageNum_exibe = $pageNum_exibe-1;
-        }
-        $startRow_exibe = $pageNum_exibe * $maxRows_exibe;
-
-        $query_exibe = $sql;
-
-        $query_limit_exibe = sprintf("%s LIMIT %d, %d", $query_exibe, $startRow_exibe, $maxRows_exibe);
-
-        $exibe = $this->query($query_limit_exibe, $cache);
-
-        $re = '/^(SELECT \*)/i';
-
-        $all_exibe_query = ($sqlTotal != null) ? $sqlTotal : ((preg_match($re, $query_exibe)) ? preg_replace($re, "SELECT COUNT(*) as __TOTALdeREG_DB_Pagination", $query_exibe) : $query_exibe);
-
-        $all_exibe = $this->query($all_exibe_query, $cache);
-        $totalRows_exibe = (isset($all_exibe->row['__TOTALdeREG_DB_Pagination'])) ? $all_exibe->row['__TOTALdeREG_DB_Pagination'] : $all_exibe->num_rows;
-
-        if($totalRows_exibe <= 0){
-            $all_exibe_query = $query_exibe;
-            $all_exibe = $this->query($all_exibe_query, $cache);
-            $totalRows_exibe = (isset($all_exibe->row['__TOTALdeREG_DB_Pagination'])) ? $all_exibe->row['__TOTALdeREG_DB_Pagination'] : $all_exibe->num_rows;
-        }
-
-        $totalPages_exibe = ceil($totalRows_exibe/$maxRows_exibe);
-
-        $exibe->totalPages_exibe = $totalPages_exibe;
-        $exibe->totalRows_exibe = $totalRows_exibe;
-        $exibe->pageNum_exibe = $pageNum_exibe+1;
-
-        return $exibe;
-    }
-	
-	/**
-	 * @param string $sql 
-	 * @return object 
-	 * @throws PhpfastcacheInvalidArgumentException 
-	 */
-	private function Cache($sql) {
-		if(class_exists('Caches')) {
-			$cache = new Caches();
-		
-			if (stripos($sql, "select") !== false) {
-
-				if($cache->check($this->cachePrefix.md5($sql))) {
-					
-					return $cache->get($this->cachePrefix.md5($sql));
-					
-				} else {
-					$cache->set($this->cachePrefix.md5($sql), $this->driver->query($sql));
-
-					return $this->driver->query($sql);
-				}
-			} else {
-				return $this->driver->query($sql);
-			}
-		} else {
-			return $this->driver->query($sql);
-		}
-	}
-
-	/**
-	 * @param string $nome 
-	 * @param object $object 
-	 * @return void 
-	 */
-	public function createSubBase($nome, $object) {
-
-        $this->$nome = $object;
-    }
-}
diff --git a/system/engine/autoload.php b/system/engine/autoload.php
index b3686ec..a7b9b13 100644
--- a/system/engine/autoload.php
+++ b/system/engine/autoload.php
@@ -66,7 +66,8 @@ class_alias("\\Phacil\\Framework\\".$class, $class);
 		'interfaces\\front',
 		'interfaces\\loader',
 		'interfaces\\action',
-		'traits\\action'
+		'traits\\action',
+		'interfaces\\databases'
 	];
 
 	if($namespace[0] == "Phacil" && in_array($classNative, $allowed)){
diff --git a/system/engine/interfaces/databases.php b/system/engine/interfaces/databases.php
new file mode 100644
index 0000000..b4caa2c
--- /dev/null
+++ b/system/engine/interfaces/databases.php
@@ -0,0 +1,67 @@
+<?php
+
+/*
+ * Copyright © 2021 ExacTI Technology Solutions. All rights reserved.
+ * GPLv3 General License.
+ * https://exacti.com.br
+ * Phacil PHP Framework - https://github.com/exacti/phacil-framework
+ */
+
+ namespace Phacil\Framework\Interfaces;
+
+ interface Databases {
+
+	/**
+	 * Construct the connection.
+	 * 
+	 * @param string $hostname 
+	 * @param string $username 
+	 * @param string $password 
+	 * @param string $database 
+	 * @param string $port Is optional
+	 * @param string $charset  Is optional
+	 * @return void 
+	 * @throws Exception 
+	 */
+	public function __construct($hostname, $username, $password, $database);
+
+	/**
+	 * Execute the SQL Query.
+	 * 
+	 * @param string $sql 
+	 * @return stdClass|true 
+	 * @throws Exception 
+	 */
+	public function query($sql);
+
+	/**
+	 * Important escape to prevent SQL injection.
+	 * 
+	 * @param string $value 
+	 * @return string 
+	 */
+	public function escape($value);
+
+	/** 
+	 * Gets the number of rows affected by the last operation
+	 * 
+	 * @return int  */
+	public function countAffected();
+
+	/** 
+	 * Gets the ID of the last inserted row or sequence of values
+	 * 
+	 * @return int|string  */
+	public function getLastId();
+
+	/** 
+	 * Check is connected on database
+	 * @return bool  */
+	public function isConnected();
+
+	/** 
+	 * Destroy the connection
+	 * 
+	 * @return void  */
+	public function __destruct();
+ }
\ No newline at end of file
diff --git a/system/system.php b/system/system.php
index 9af0065..3b02e36 100644
--- a/system/system.php
+++ b/system/system.php
@@ -151,7 +151,7 @@ private function defineAuxConstants () {
     private function loadengine () {
         $this->dirs = glob(DIR_SYSTEM.'*/autoload.php', GLOB_BRACE);
         
-        require_once (DIR_SYSTEM.'database/autoload.php');
+        //require_once (DIR_SYSTEM.'database/autoload.php');
 
         require_once (DIR_SYSTEM.'engine/autoload.php');
     }