diff --git a/ServidorTFG.pro.user b/ServidorTFG.pro.user
index b796cf9..217efb5 100644
--- a/ServidorTFG.pro.user
+++ b/ServidorTFG.pro.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.8.2, 2020-06-02T15:21:19. -->
+<!-- Written by QtCreator 4.8.2, 2020-06-03T18:58:43. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
diff --git a/conexion.cpp b/conexion.cpp
index 3f70b6d..7540c92 100644
--- a/conexion.cpp
+++ b/conexion.cpp
@@ -11,7 +11,9 @@ void conexion_client(int client);
 conexion::conexion(config_reader &config)
 {
   this->config=&config;
-  this->data=new msql_acces();
+  config.get_param("db_user",msql_acces::user);
+  config.get_param("db_pass",msql_acces::pass);
+  this->data=msql_acces::get_instance();
 }
 
 int conexion::create_socket(int port)
diff --git a/msql_acces.cpp b/msql_acces.cpp
index 2d596d3..da530d0 100644
--- a/msql_acces.cpp
+++ b/msql_acces.cpp
@@ -4,10 +4,21 @@
 #include <openssl/evp.h>
 #include <string.h>
 
+std::string msql_acces::user="root";
+std::string msql_acces::pass="1234";
+msql_acces* msql_acces::instance=nullptr;
+
+msql_acces* msql_acces::get_instance(){
+  if(msql_acces::instance==nullptr){
+      msql_acces::instance=new msql_acces();
+    }
+  return msql_acces::instance;
+}
+
 msql_acces::msql_acces()
 {
   driver = get_driver_instance();
-  con = driver->connect("tcp://127.0.0.1:3306", "root", "1234");
+  con = driver->connect("tcp://127.0.0.1:3306", msql_acces::user, msql_acces::pass);
   con->setSchema("bin_database");
 }
 
diff --git a/msql_acces.h b/msql_acces.h
index 60ed05b..3c9f219 100644
--- a/msql_acces.h
+++ b/msql_acces.h
@@ -11,7 +11,9 @@
 class msql_acces : public data_acces
 {
 public:
-  msql_acces();
+  static msql_acces* get_instance();
+  static std::string user;
+  static std::string pass;
   std::string get_passwd(std::string username);
   bool get_admin(std::string);
   std::list<std::string> get_pinfo();
@@ -22,6 +24,8 @@ public:
   void create_user(std::string user, std::string pass, bool admin);
   void remove_user(std::string user);
 private:
+  msql_acces();
+  static msql_acces* instance;
   sql::Connection *con;
   sql::Driver *driver;
 };
diff --git a/session_manager.cpp b/session_manager.cpp
index 0a75192..8d0de0f 100644
--- a/session_manager.cpp
+++ b/session_manager.cpp
@@ -11,7 +11,7 @@
 session_manager::session_manager(int fd)
 {
   this->fd=fd;
-  this->data=new msql_acces();
+  this->data=msql_acces::get_instance();
 }
 
 bool session_manager::validate_pass(){
diff --git a/tests.cpp b/tests.cpp
index 69e522c..4a7351e 100644
--- a/tests.cpp
+++ b/tests.cpp
@@ -6,7 +6,9 @@
 
 void test_basic::setUp(){
   this->conf=new config_reader("config");
-  this->data=new msql_acces();
+  conf->get_param("db_user",msql_acces::user);
+  conf->get_param("db_pass",msql_acces::pass);
+  this->data=msql_acces::get_instance();
 }
 
 void test_basic::test_initial(){