diff --git a/paramecio/cromosoma/databases/mysql.py b/paramecio/cromosoma/databases/mysql.py
deleted file mode 100644
index 7ea17f2..0000000
--- a/paramecio/cromosoma/databases/mysql.py
+++ /dev/null
@@ -1,99 +0,0 @@
-#!/usr/bin/env python3
-
-import sys
-import pymysql
-pymysql.install_as_MySQLdb()
-
-class SqlClass:
-    
-    connection={}
-    connection_method=''
-    
-    def __init__(self):
-    
-        self.error_connection=""       
-        self.connected=False
-        SqlClass.connection_method=self.connect_to_db_sql
-    
-    def dummy_connect(self, connection, name_connection="default"):
-        pass
-    
-    def connect_to_db(self, connection, name_connection="default"):
-        
-        SqlClass.connection_method(connection, name_connection)
-        
-        SqlClass.connection_method=self.dummy_connect
-        
-    def connect_to_db_sql(self, connection, name_connection="default"):
-        
-        try:
-        
-            self.connection[name_connection] = pymysql.connect(connection['host'],
-                user=connection['user'],
-                passwd=connection['password'],
-                db=connection['db'],
-                charset='utf8mb4',
-                cursorclass=pymysql.cursors.DictCursor)
-            
-            self.connected=True
-            
-        except:
-            e = sys.exc_info()[0]
-            v = sys.exc_info()[1]
-            
-            self.error_connection="Error in connection: %s %s" % (e, v)
-            
-            #return False
-            raise NameError(self.error_connection)
-    
-    #Make def query more simple if not debugging.
-    
-    def query(self, sql_query, arguments=[], name_connection="default"):
-        
-        #if fetch_type=="ASSOC":
-            #fetch_type=pymysql.cursors.DictCursor
-        
-        with self.connection[name_connection].cursor(pymysql.cursors.DictCursor) as cursor:
-            
-            try:
-                
-                cursor.execute(sql_query, arguments)
-                self.connection[name_connection].commit()
-                
-                return cursor
-            
-            except:
-                e = sys.exc_info()[0]
-                v = sys.exc_info()[1]
-                
-                if hasattr(cursor, '_last_executed'):
-                   sql_query=cursor._last_executed 
-                
-                self.error_connection="Error in query ||"+sql_query+"||: %s %s" % (e, v)
-            
-                #return False
-                raise NameError(self.error_connection)
-    
-    #Fetcho row return dictionary if is defined in query.
-    
-    #def fetch(self, cursor):
-        
-        #return cursor.fetchone()
-    """
-    def __del__(self):
-        
-        for key in self.connection:
-        
-            self.close(self.connection)
-    """
-    """
-    def close(self, name_connection="default"):
-        
-        if self.connection[name_connection]:
-        
-            self.connection[name_connection].close()
-            self.connection[name_connection]=False
-        
-        pass
-    """
-    
diff --git a/paramecio/cromosoma/databases/pymysql.py b/paramecio/cromosoma/databases/pymysql.py
new file mode 100644
index 0000000..3c71718
--- /dev/null
+++ b/paramecio/cromosoma/databases/pymysql.py
@@ -0,0 +1,109 @@
+#!/usr/bin/env python3
+
+import sys
+import pymysql.cursors
+pymysql.install_as_MySQLdb
+import sqlalchemy.pool as pool
+import traceback
+
+class SqlClass:
+    
+    mypool=None
+    
+    def __init__(self):
+    
+        self.max_overflow=45
+        self.pool_size=30
+        self.error_connection=""
+        self.connection={}
+        self.connected=False
+        self.connection_method=self.connect_to_db_sql
+    
+    def dummy_connect(self, connection, name_connection="default"):
+        pass
+    
+    def connect_to_db(self, connection, name_connection="default"):
+        
+        self.connection_method(connection, name_connection)
+        
+        self.connection_method=self.dummy_connect
+    
+    def connect_to_db_sql(self, connection, name_connection="default"):
+        
+        try:
+            def getconn():
+                return pymysql.connect(connection['host'],
+                    user=connection['user'],
+                    passwd=connection['password'],
+                    db=connection['db'],
+                    charset='utf8mb4',
+                    cursorclass=pymysql.cursors.DictCursor)
+            
+            if SqlClass.mypool==None:
+                SqlClass.mypool=pool.QueuePool(getconn, max_overflow=self.max_overflow, pool_size=self.pool_size)
+            
+            self.connection[name_connection]=SqlClass.mypool.connect()
+            
+            self.connection[name_connection].ping(True)
+            
+            self.connected=True
+            
+        except:
+            e = sys.exc_info()[0]
+            v = sys.exc_info()[1]
+            
+            self.error_connection="Error in connection: %s %s" % (e, v)
+            
+            #return False
+            raise NameError(self.error_connection)
+    
+    #Make def query more simple if not debugging.
+    
+    def query(self, sql_query, arguments=[], name_connection="default"):
+        
+        #if fetch_type=="ASSOC":
+            #fetch_type=pymysql.cursors.DictCursor
+        
+        #with self.connection[name_connection].cursor(pymysql.cursors.DictCursor) as cursor:
+        cursor=self.connection[name_connection].cursor(pymysql.cursors.DictCursor)
+        
+        try:
+            
+            cursor.execute(sql_query, arguments)
+            self.connection[name_connection].commit()
+            
+            return cursor
+        
+        except:
+            e = sys.exc_info()[0]
+            v = sys.exc_info()[1]
+            
+            if hasattr(cursor, '_last_executed'):
+               sql_query=cursor._last_executed 
+            #, traceback.format_exc()
+            self.error_connection="Error in query ||%s||Values: %s" % (sql_query, str(arguments))
+        
+            #return False
+            raise NameError(self.error_connection)
+    
+    #Fetcho row return dictionary if is defined in query.
+    
+    #def fetch(self, cursor):
+        
+        #return cursor.fetchone()
+    """
+    def __del__(self):
+        
+        self.close()
+    """
+    
+    def close(self, name_connection="default"):
+        
+        if self.connection[name_connection]:
+        
+            self.connection[name_connection].close()
+            #self.connection[name_connection]=False
+        
+        pass
+    
+    
diff --git a/paramecio/cromosoma/webmodel.py b/paramecio/cromosoma/webmodel.py
index 714dd83..7cc0317 100644
--- a/paramecio/cromosoma/webmodel.py
+++ b/paramecio/cromosoma/webmodel.py
@@ -5,7 +5,7 @@ import re
 import uuid
 from importlib import import_module, reload
 from collections import OrderedDict
-from paramecio.cromosoma.databases.mysqldb import SqlClass
+from paramecio.cromosoma.databases.pymysql import SqlClass
 from paramecio.cromosoma.coreforms import BaseForm, HiddenForm
 import traceback