diff --git a/DataSource/MySQL/MySQL.py b/DataSource/MySQL/common_utils.py
similarity index 100%
rename from DataSource/MySQL/MySQL.py
rename to DataSource/MySQL/common_utils.py
diff --git a/leapi/datasources/ledatasourcesql.py b/DataSource/MySQL/leapidatasource.py
similarity index 99%
rename from leapi/datasources/ledatasourcesql.py
rename to DataSource/MySQL/leapidatasource.py
index aed9f0d..5296c55 100644
--- a/leapi/datasources/ledatasourcesql.py
+++ b/DataSource/MySQL/leapidatasource.py
@@ -4,7 +4,6 @@ import pymysql
 import copy
 
 import leapi
-from leapi.datasources.dummy import DummyDatasource
 from leapi.leobject import REL_SUB, REL_SUP
 
 from leapi.lecrud import _LeCrud
@@ -14,7 +13,8 @@ from mosql.query import select, insert, update, delete, join, left_join
 from mosql.util import raw, or_
 import mosql.mysql
 
-from DataSource.MySQL.MySQL import MySQL
+from DataSource.dummy.leapidatasource import DummyDatasource
+from DataSource.MySQL.common_utils import MySQL
 from EditorialModel.classtypes import EmNature, common_fields
 
 
diff --git a/EditorialModel/migrationhandler/sql.py b/DataSource/MySQL/migrationhandler.py
similarity index 98%
rename from EditorialModel/migrationhandler/sql.py
rename to DataSource/MySQL/migrationhandler.py
index b5740f2..b9a4d91 100644
--- a/EditorialModel/migrationhandler/sql.py
+++ b/DataSource/MySQL/migrationhandler.py
@@ -7,7 +7,7 @@
 #
 
 import EditorialModel
-from EditorialModel.migrationhandler.dummy import DummyMigrationHandler
+from DataSource.dummy.migrationhandler import DummyMigrationHandler
 from EditorialModel.fieldtypes.generic import GenericFieldType
 from EditorialModel.model import Model
 from mosql.db import Database
diff --git a/leapi/datasources/dummy.py b/DataSource/dummy/leapidatasource.py
similarity index 100%
rename from leapi/datasources/dummy.py
rename to DataSource/dummy/leapidatasource.py
diff --git a/EditorialModel/migrationhandler/dummy.py b/DataSource/dummy/migrationhandler.py
similarity index 100%
rename from EditorialModel/migrationhandler/dummy.py
rename to DataSource/dummy/migrationhandler.py
diff --git a/EditorialModel/migrationhandler/__init__.py b/EditorialModel/migrationhandler/__init__.py
deleted file mode 100644
index e80b3c4..0000000
--- a/EditorialModel/migrationhandler/__init__.py
+++ /dev/null
@@ -1,6 +0,0 @@
-## @package EditorialModel.migrationhandler
-# @brief Tell to an editorial model wether or not a wanted modification is possible
-#
-# The migration handler provide an API for the EditorialModel to ask wether or not a model modification
-# is possible/allowed.
-#
diff --git a/EditorialModel/migrationhandler/mysql.py b/EditorialModel/migrationhandler/mysql.py
deleted file mode 100644
index fca4f95..0000000
--- a/EditorialModel/migrationhandler/mysql.py
+++ /dev/null
@@ -1,545 +0,0 @@
-# -*- coding: utf-8 -*-
-
-import copy
-import pymysql
-
-import EditorialModel
-from DataSource.MySQL.MySQL import MySQL
-
-# The global MH algorithm is as follow :
-# A create_table(table_name, pk_name, pk_opt) method that create a table
-# with one pk field
-# An add_column(table_name, field_name, field_opt) method that add a column to a table
-#
-# The create_default_table method will call both methods to create the object and relation tables
-#
-# Supported operations :
-# - EmClass creation
-# - EmClass deletion (untested)
-# - EmField creation
-# - EmField deletion (untested)
-# - rel2type attribute creation
-# - rel2type attribute deletion (unstested)
-#
-# Unsupported operations :
-# - EmClass rename
-# - EmField rename
-# - rel2type field rename
-# - rel2type attribute rename
-# - EmFieldType changes
-#
-# @todo Unified datasources and migration handlers via utils functions
-
-
-## @brief Modify a MySQL database given editorial model changes
-class MysqlMigrationHandler(EditorialModel.migrationhandler.dummy.DummyMigrationHandler):
-
-    ## @brief Construct a MysqlMigrationHandler
-    # @param host str : The db host
-    # @param user str : The db user
-    # @param password str : The db password
-    # @param db str : The db name
-    def __init__(self, host, user, password, db, db_engine='InnoDB', foreign_keys=True, debug=False, dryrun=False, drop_if_exists=False):
-        self.datasource = MySQL
-        #Connect to MySQL
-        self.db = pymysql.connect(host=host, user=user, passwd=password, db=db)
-        self.debug = debug
-        self.dryrun = dryrun
-        self.db_engine = db_engine
-        self.foreign_keys = foreign_keys if db_engine == 'InnoDB' else False
-        self.drop_if_exists = drop_if_exists
-        #Create default tables
-        self._create_default_tables(self.drop_if_exists)
-
-    ## @brief Delete all table created by the MH
-    # @param model Model : the Editorial model
-    def __purge_db(self, model):
-        for uid in [c.uid for c in model.components('EmClass')]:
-            try:
-                self.delete_emclass_table(model, uid)
-            except pymysql.err.InternalError as e:
-                print(e)
-
-        for tname in [MySQL.get_r2t2table_name(f.em_class.name, model.component(f.rel_to_type_id).name) for f in model.components('EmField') if f.fieldtype == 'rel2type']:
-            try:
-                self._query("DROP TABLE %s;" % tname)
-            except pymysql.err.InternalError as e:
-                print(e)
-
-        for tname in [MySQL.relations_table_name, MySQL.objects_table_name]:
-            try:
-                self._query("DROP TABLE %s;" % tname)
-            except pymysql.err.InternalError as e:
-                print(e)
-
-    ## @brief Modify the db given an EM change
-    # @param em model : The EditorialModel.model object to provide the global context
-    # @param uid int : The uid of the change EmComponent
-    # @param initial_state dict | None : dict with field name as key and field value as value. Representing the original state. None mean creation of a new component.
-    # @param new_state dict | None : dict with field name as key and field value as value. Representing the new state. None mean component deletion
-    # @throw EditorialModel.exceptions.MigrationHandlerChangeError if the change was refused
-    def register_change(self, em, uid, initial_state, new_state, engine=None):
-        if engine is None:
-            engine = self.db_engine
-        if isinstance(em.component(uid), EditorialModel.classes.EmClass):
-            if initial_state is None:
-                #EmClass creation
-                self.create_emclass_table(em, uid, engine)
-            elif new_state is None:
-                #EmClass deletion
-                self.delete_emclass_table(em, uid)
-        elif isinstance(em.component(uid), EditorialModel.fields.EmField):
-            emfield = em.component(uid)
-            if emfield.rel_field_id is None:
-                #non relationnal field
-                if initial_state is None:
-                    #non relationnal EmField creation
-                    if emfield.name not in EditorialModel.classtypes.common_fields.keys():
-                        self.add_col_from_emfield(em, uid)
-                elif new_state is None:
-                    #non relationnal EmField deletion
-                    if emfield.name not in EditorialModel.classtypes.common_fields.keys():
-                        self.del_col_from_emfield(em, uid)
-            else:
-                #relationnal field
-                if initial_state is None:
-                    #Rel2type attr creation
-                    self.add_relationnal_field(em, uid)
-                elif new_state is None:
-                    #Rel2type attr deletion
-                    self.del_relationnal_field(em, uid)
-
-    ## @brief dumdumdummy
-    # @note implemented to avoid the log message of EditorialModel.migrationhandler.dummy.DummyMigrationHandler
-    def register_model_state(self, em, state_hash):
-        pass
-
-    ## @brief Exec a query
-    # @param query str : SQL query
-    def _query(self, query):
-        if self.debug:
-            print(query + "\n")
-        if not self.dryrun:
-            with self.db.cursor() as cur:
-                cur.execute(query)
-        self.db.commit()  # autocommit
-
-    ## @brief Add a relationnal field
-    # Add a rel2type attribute
-    # @note this function handles the table creation
-    # @param em Model : EditorialModel.model.Model instance
-    # @param rfuid int : Relationnal field uid
-    def add_relationnal_field(self, em, rfuid):
-        emfield = em.component(rfuid)
-        if not isinstance(emfield, EditorialModel.fields.EmField):
-            raise ValueError("The given uid is not an EmField uid")
-
-        r2tf = em.component(emfield.rel_field_id)
-        tname = self._r2t2table_name(em, r2tf)
-        pkname, pkftype = self._relation_pk
-
-        #If not exists create a relational table
-        self._create_table(tname, pkname, pkftype, self.db_engine, if_exists='nothing')
-        #Add a foreign key if wanted
-        if self.foreign_keys:
-            self._add_fk(tname, self.datasource.relations_table_name, pkname, pkname)
-        #Add the column
-        self._add_column(tname, emfield.name, emfield.fieldtype_instance())
-        #Update table triggers
-        self._generate_triggers(tname, self._r2type2cols(em, r2tf))
-
-    ## @brief Delete a rel2type attribute
-    #
-    # Delete a rel2type attribute
-    # @note this method handles the table deletion
-    # @param em Model : EditorialModel.model.Model instance
-    # @param rfuid int : Relationnal field uid
-    def del_relationnal_field(self, em, rfuid):
-        emfield = em.component(rfuid)
-        if not isinstance(emfield, EditorialModel.fields.EmField):
-            raise ValueError("The given uid is not an EmField uid")
-
-        r2tf = em.component(emfield.rel_field_id)
-        tname = self._r2t2table_name(em, r2tf)
-
-        if len(self._r2type2cols(em, r2tf)) == 1:
-            #The table can be deleted (no more attribute for this rel2type)
-            self._query("""DROP TABLE {table_name}""".format(table_name=tname))
-        else:
-            self._del_column(tname, emfield.name)
-            #Update table triggers
-            self._generate_triggers(tname, self._r2type2cols(em, r2tf))
-
-    ## @brief Given an EmField uid add a column to the corresponding table
-    # @param em Model : A Model instance
-    # @param uid int : An EmField uid
-    def add_col_from_emfield(self, em, uid):
-        emfield = em.component(uid)
-        if not isinstance(emfield, EditorialModel.fields.EmField):
-            raise ValueError("The given uid is not an EmField uid")
-
-        emclass = emfield.em_class
-        tname = self._emclass2table_name(emclass)
-        self._add_column(tname, emfield.name, emfield.fieldtype_instance())
-        # Refresh the table triggers
-        cols_l = self._class2cols(emclass)
-        self._generate_triggers(tname, cols_l)
-
-    ## @brief Given a class uid create the coressponding table
-    # @param em Model : A Model instance
-    # @param uid int : An EmField uid
-    def create_emclass_table(self, em, uid, engine):
-        emclass = em.component(uid)
-        if not isinstance(emclass, EditorialModel.classes.EmClass):
-            raise ValueError("The given uid is not an EmClass uid")
-        pkname, pktype = self._common_field_pk
-        table_name = self._emclass2table_name(emclass)
-        self._create_table(table_name, pkname, pktype, engine=engine)
-
-        if self.foreign_keys:
-            self._add_fk(table_name, self.datasource.objects_table_name, pkname, pkname)
-
-    ## @brief Given an EmClass uid delete the corresponding table
-    # @param em Model : A Model instance
-    # @param uid int : An EmField uid
-    def delete_emclass_table(self, em, uid):
-        emclass = em.component(uid)
-        if not isinstance(emclass, EditorialModel.classes.EmClass):
-            raise ValueError("The give uid is not an EmClass uid")
-        tname = self._emclass2table_name(emclass)
-        # Delete the table triggers to prevent errors
-        self._generate_triggers(tname, dict())
-
-        tname = self.datasource.escape_idname(tname)
-
-        self._query("""DROP TABLE {table_name};""".format(table_name=tname))
-
-    ## @brief Given an EmField delete the corresponding column
-    # @param em Model : an @ref EditorialModel.model.Model instance
-    # @param uid int : an EmField uid
-    def delete_col_from_emfield(self, em, uid):
-        emfield = em.component(uid)
-        if not isinstance(emfield, EditorialModel.fields.EmField):
-            raise ValueError("The given uid is not an EmField uid")
-
-        emclass = emfield.em_class
-        tname = self._emclass2table_name(emclass)
-        # Delete the table triggers to prevent errors
-        self._generate_triggers(tname, dict())
-
-        self._del_column(tname, emfield.name)
-        # Refresh the table triggers
-        cols_ls = self._class2cols(emclass)
-        self._generate_triggers(tname, cols_l)
-
-    ## @brief Delete a column from a table
-    # @param tname str : The table name
-    # @param fname str : The column name
-    def _del_column(self, tname, fname):
-        tname = self.datasource.escape_idname(tname)
-        fname = self.datasource.escape_idname(fname)
-
-        self._query("""ALTER TABLE {table_name} DROP COLUMN {col_name};""".format(table_name=tname, col_name=fname))
-
-    ## @brief Construct a table name given an EmClass instance
-    # @param emclass EmClass : An EmClass instance
-    # @return a table name
-    def _emclass2table_name(self, emclass):
-        return self.datasource.get_table_name_from_class(emclass.name)
-        #return "class_%s"%emclass.name
-
-    ## @brief Construct a table name given a rela2type EmField instance
-    # @param em Model : A Model instance
-    # @param emfield EmField : An EmField instance
-    # @return a table name
-    def _r2t2table_name(self, em, emfield):
-        emclass = emfield.em_class
-        emtype = em.component(emfield.rel_to_type_id)
-        return self.datasource.get_r2t2table_name(emclass.name, emtype.name)
-        #return "%s_%s_%s"%(emclass.name, emtype.name, emfield.name)
-
-    ## @brief Generate a columns_fieldtype dict given a rel2type EmField
-    # @param em Model : an @ref EditorialModel.model.Model instance
-    # @param emfield EmField : and @ref EditorialModel.fields.EmField instance
-    def _r2type2cols(self, em, emfield):
-        return {f.name: f.fieldtype_instance() for f in em.components('EmField') if f.rel_field_id == emfield.uid}
-
-    ## @brief Generate a columns_fieldtype dict given an EmClass
-    # @param emclass EmClass : An EmClass instance
-    # @return A dict with column name as key and EmFieldType instance as value
-    def _class2cols(self, emclass):
-        if not isinstance(emclass, EditorialModel.classes.EmClass):
-            raise ValueError("The given uid is not an EmClass uid")
-        return {f.name: f.fieldtype_instance() for f in emclass.fields() if f.name not in EditorialModel.classtypes.common_fields.keys()}
-
-    ## @brief Create object and relations tables
-    # @param drop_if_exist bool : If true drop tables if exists
-    def _create_default_tables(self, drop_if_exist=False):
-        if_exists = 'drop' if drop_if_exist else 'nothing'
-        #Object tablea
-        tname = self.datasource.objects_table_name
-        pk_name, pk_ftype = self._common_field_pk
-        self._create_table(tname, pk_name, pk_ftype, engine=self.db_engine, if_exists=if_exists)
-        #Adding columns
-        cols = {fname: self._common_field_to_ftype(fname) for fname in EditorialModel.classtypes.common_fields}
-        for fname, ftype in cols.items():
-            if fname != pk_name:
-                self._add_column(tname, fname, ftype)
-        #Creating triggers
-        self._generate_triggers(tname, cols)
-
-        #Relation table
-        tname = self.datasource.relations_table_name
-        pk_name, pk_ftype = self._relation_pk
-        self._create_table(tname, pk_name, pk_ftype, engine=self.db_engine, if_exists=if_exists)
-        #Adding columns
-        for fname, ftype in self._relation_cols.items():
-            self._add_column(tname, fname, ftype)
-        #Creating triggers
-        self._generate_triggers(tname, self._relation_cols)
-
-    ## @return true if the name changes
-    def _name_change(self, initial_state, new_state):
-        return 'name' in initial_state and initial_state['name'] != new_state['name']
-
-    ## @brief Create a table with primary key
-    # @param table_name str : table name
-    # @param pk_name str : pk column name
-    # @param pk_specs str : see @ref _field_to_sql()
-    # @param engine str : The engine to use with this table
-    # @param charset str : The charset of this table
-    # @param if_exist str : takes values in ['nothing', 'drop']
-    def _create_table(self, table_name, pk_name, pk_ftype, engine, charset='utf8', if_exists='nothing'):
-        #Escaped table name
-        etname = self.datasource.escape_idname(table_name)
-        pk_type = self._field_to_type(pk_ftype)
-        pk_specs = self._field_to_specs(pk_ftype)
-
-        if if_exists == 'drop':
-            self._query("""DROP TABLE IF EXISTS {table_name};""".format(table_name=etname))
-            qres = """
-CREATE TABLE {table_name} (
-{pk_name} {pk_type} {pk_specs},
-PRIMARY KEY({pk_name})
-) ENGINE={engine} DEFAULT CHARSET={charset};"""
-        elif if_exists == 'nothing':
-            qres = """CREATE TABLE IF NOT EXISTS {table_name} (
-{pk_name} {pk_type} {pk_specs},
-PRIMARY KEY({pk_name})
-) ENGINE={engine} DEFAULT CHARSET={charset};"""
-        else:
-            raise ValueError("Unexpected value for argument if_exists '%s'." % if_exists)
-
-        self._query(qres.format(
-            table_name=self.datasource.escape_idname(table_name),
-            pk_name=self.datasource.escape_idname(pk_name),
-            pk_type=pk_type,
-            pk_specs=pk_specs,
-            engine=engine,
-            charset=charset
-        ))
-
-    ## @brief Add a column to a table
-    # @param table_name str : The table name
-    # @param col_name str : The columns name
-    # @param col_fieldtype EmFieldype the fieldtype
-    def _add_column(self, table_name, col_name, col_fieldtype, drop_if_exists=False):
-        add_col = """ALTER TABLE {table_name}
-ADD COLUMN {col_name} {col_type} {col_specs};"""
-
-        etname = self.datasource.escape_idname(table_name)
-        ecname = self.datasource.escape_idname(col_name)
-
-        add_col = add_col.format(
-            table_name=etname,
-            col_name=ecname,
-            col_type=self._field_to_type(col_fieldtype),
-            col_specs=self._field_to_specs(col_fieldtype),
-        )
-        try:
-            self._query(add_col)
-        except pymysql.err.InternalError as e:
-            if drop_if_exists:
-                self._del_column(table_name, col_name)
-                self._add_column(table_name, col_name, col_fieldtype, drop_if_exists)
-            else:
-                #LOG
-                print("Aborded, column `%s` exists" % col_name)
-
-    ## @brief Add a foreign key
-    # @param src_table_name str : The name of the table where we will add the FK
-    # @param dst_table_name str : The name of the table the FK will point on
-    # @param src_col_name str : The name of the concerned column in the src_table
-    # @param dst_col_name str : The name of the concerned column in the dst_table
-    def _add_fk(self, src_table_name, dst_table_name, src_col_name, dst_col_name):
-        stname = self.datasource.escape_idname(src_table_name)
-        dtname = self.datasource.escape_idname(dst_table_name)
-        scname = self.datasource.escape_idname(src_col_name)
-        dcname = self.datasource.escape_idname(dst_col_name)
-
-        fk_name = self.datasource.get_fk_name(src_table_name, dst_table_name)
-
-        self._del_fk(src_table_name, dst_table_name)
-
-        self._query("""ALTER TABLE {src_table}
-ADD CONSTRAINT {fk_name}
-FOREIGN KEY ({src_col}) references {dst_table}({dst_col});""".format(
-            fk_name=self.datasource.escape_idname(fk_name),
-            src_table=stname,
-            src_col=scname,
-            dst_table=dtname,
-            dst_col=dcname
-        ))
-
-    ## @brief Given a source and a destination table, delete the corresponding FK
-    # @param src_table_name str : The name of the table where the FK is
-    # @param dst_table_name str : The name of the table the FK point on
-    # @warning fails silently
-    def _del_fk(self, src_table_name, dst_table_name):
-        try:
-            self._query("""ALTER TABLE {src_table}
-DROP FOREIGN KEY {fk_name}""".format(
-                src_table=self.datasource.escape_idname(src_table_name),
-                fk_name=self.datasource.escape_idname(self.datasource.get_fk_name(src_table_name, dst_table_name))
-            ))
-        except pymysql.err.InternalError:
-            # If the FK don't exists we do not care
-            pass
-
-    ## @brief Generate triggers given a table_name and its columns fieldtypes
-    # @param table_name str : Table name
-    # @param cols_ftype dict : with col name as key and column fieldtype as value
-    def _generate_triggers(self, table_name, cols_ftype):
-        colval_l_upd = dict()  # param for update trigger
-        colval_l_ins = dict()  # param for insert trigger
-
-        for cname, cftype in cols_ftype.items():
-            if cftype.ftype == 'datetime':
-                if cftype.now_on_update:
-                    colval_l_upd[cname] = 'NOW()'
-                if cftype.now_on_create:
-                    colval_l_ins[cname] = 'NOW()'
-
-        self._table_trigger(table_name, 'UPDATE', colval_l_upd)
-        self._table_trigger(table_name, 'INSERT', colval_l_ins)
-
-    ## @brief Create trigger for a table
-    #
-    # Primarly designed to create trigger for DATETIME types
-    # The method generates triggers of the form
-    #
-    # CREATE TRIGGER BEFORE <moment> ON <table_name>
-    # FOR EACH ROW SET <for colname, colval in cols_val>
-    # NEW.<colname> = <colval>,
-    # <endfor>;
-    # @param table_name str : The table name
-    # @param moment str : can be 'update' or 'insert'
-    # @param cols_val dict : Dict with column name as key and column value as value
-    def _table_trigger(self, table_name, moment, cols_val):
-        trigger_name = self.datasource.escape_idname("%s_%s_trig" % (table_name, moment))
-        #Try to delete the trigger
-        drop_trig = """DROP TRIGGER IF EXISTS {trigger_name};""".format(trigger_name=trigger_name)
-        self._query(drop_trig)
-
-        col_val_l = ', '.join(["NEW.%s = %s" % (self.datasource.escape_idname(cname), cval)for cname, cval in cols_val.items()])
-        #Create a trigger if needed
-        if len(col_val_l) > 0:
-            trig_q = """CREATE TRIGGER {trigger_name} BEFORE {moment} ON {table_name}
-FOR EACH ROW SET {col_val_list};""".format(
-                trigger_name=trigger_name,
-                table_name=self.datasource.escape_idname(table_name),
-                moment=moment, col_val_list=col_val_l
-            )
-            self._query(trig_q)
-
-    ## @brief Identifier escaping
-    # @param idname str : An SQL identifier
-    #def _idname_escape(self, idname):
-    #    if '`' in idname:
-    #        raise ValueError("Invalid name : '%s'"%idname)
-    #    return '`%s`'%idname
-
-    ## @brief Returns column specs from fieldtype
-    # @param emfieldtype EmFieldType : An EmFieldType insance
-    # @todo escape default value
-    def _field_to_specs(self, emfieldtype):
-        colspec = ''
-        if not emfieldtype.nullable:
-            colspec = 'NOT NULL'
-        if hasattr(emfieldtype, 'default'):
-            colspec += ' DEFAULT '
-            if emfieldtype.default is None:
-                colspec += 'NULL '
-            else:
-                colspec += emfieldtype.default  # ESCAPE VALUE HERE !!!!
-
-        if emfieldtype.name == 'pk':
-            colspec += ' AUTO_INCREMENT'
-
-        return colspec
-
-    ## @brief Given a fieldtype return a MySQL type specifier
-    # @param emfieldtype EmFieldType : A fieldtype
-    # @return the corresponding MySQL type
-    def _field_to_type(self, emfieldtype):
-        ftype = emfieldtype.ftype
-
-        if ftype == 'char' or ftype == 'str':
-            res = "VARCHAR(%d)" % emfieldtype.max_length
-        elif ftype == 'text':
-            res = "TEXT"
-        elif ftype == 'datetime':
-            res = "DATETIME"
-            # client side workaround for only one column with CURRENT_TIMESTAMP : giving NULL to timestamp that don't allows NULL
-            # cf. https://dev.mysql.com/doc/refman/5.0/en/timestamp-initialization.html#idm139961275230400
-            # The solution for the migration handler is to create triggers :
-            # CREATE TRIGGER trigger_name BEFORE INSERT ON `my_super_table`
-            # FOR EACH ROW SET NEW.my_date_column = NOW();
-            # and
-            # CREATE TRIGGER trigger_name BEFORE UPDATE ON
-
-        elif ftype == 'bool':
-            res = "BOOL"
-        elif ftype == 'int':
-            res = "INT"
-        elif ftype == 'rel2type':
-            res = "INT"
-        else:
-            raise ValueError("Unsuported fieldtype ftype : %s" % ftype)
-
-        return res
-
-    ## @brief Returns a tuple (pkname, pk_ftype)
-    @property
-    def _common_field_pk(self):
-        for fname, fta in EditorialModel.classtypes.common_fields.items():
-            if fta['fieldtype'] == 'pk':
-                return (fname, self._common_field_to_ftype(fname))
-        return (None, None)
-
-    ## @brief Returns a tuple (rel_pkname, rel_ftype)
-    # @todo do it
-    @property
-    def _relation_pk(self):
-        return (MySQL.relations_pkname, EditorialModel.fieldtypes.pk.EmFieldType())
-
-    ## @brief Returns a dict { colname:fieldtype } of relation table columns
-    @property
-    def _relation_cols(self):
-        from_name = EditorialModel.fieldtypes.generic.GenericFieldType.from_name
-        return {
-            'id_sup': from_name('integer')(),
-            'id_sub': from_name('integer')(),
-            'rank': from_name('integer')(nullable=True),
-            'depth': from_name('integer')(nullable=True),
-            'nature': from_name('char')(max_lenght=10, nullable=True),
-        }
-
-    ## @brief Given a common field name return an EmFieldType instance
-    # @param cname str : Common field name
-    # @return An EmFieldType instance
-    def _common_field_to_ftype(self, cname):
-        fta = copy.copy(EditorialModel.classtypes.common_fields[cname])
-        fto = EditorialModel.fieldtypes.generic.GenericFieldType.from_name(fta['fieldtype'])
-        del fta['fieldtype']
-        return fto(**fta)
diff --git a/EditorialModel/model.py b/EditorialModel/model.py
index 82812f2..c2c38aa 100644
--- a/EditorialModel/model.py
+++ b/EditorialModel/model.py
@@ -4,10 +4,9 @@
 # Contains the class managing and editorial model
 
 import EditorialModel
-from EditorialModel.migrationhandler.dummy import DummyMigrationHandler
+from DataSource.dummy.migrationhandler import DummyMigrationHandler
 from EditorialModel.backend.dummy_backend import EmBackendDummy
 from EditorialModel.classes import EmClass
-#from EditorialModel.fieldgroups import EmFieldGroup
 from EditorialModel.fields import EmField
 from EditorialModel.types import EmType
 from EditorialModel.exceptions import EmComponentCheckError, EmComponentNotExistError, MigrationHandlerChangeError
diff --git a/EditorialModel/test/test_classes.py b/EditorialModel/test/test_classes.py
index 72a6bc8..643a2af 100644
--- a/EditorialModel/test/test_classes.py
+++ b/EditorialModel/test/test_classes.py
@@ -15,7 +15,7 @@ from EditorialModel.types import EmType
 from EditorialModel.fields import EmField
 from EditorialModel.model import Model
 from EditorialModel.backend.json_backend import EmBackendJson
-from EditorialModel.migrationhandler.dummy import DummyMigrationHandler
+from DataSource.dummy.migrationhandler import DummyMigrationHandler
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "Lodel.settings")
 EM_TEST = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'me.json')
diff --git a/EditorialModel/test/test_component.py b/EditorialModel/test/test_component.py
index 381da0c..abfd7a1 100644
--- a/EditorialModel/test/test_component.py
+++ b/EditorialModel/test/test_component.py
@@ -9,7 +9,7 @@ from EditorialModel.fields import EmField
 from Lodel.utils.mlstring import MlString
 
 from EditorialModel.backend.json_backend import EmBackendJson
-from EditorialModel.migrationhandler.dummy import DummyMigrationHandler
+from DataSource.dummy.migrationhandler import DummyMigrationHandler
 
 
 class TestEmComponent(unittest.TestCase):
diff --git a/EditorialModel/test/test_model.py b/EditorialModel/test/test_model.py
index a9f72b2..6665f40 100644
--- a/EditorialModel/test/test_model.py
+++ b/EditorialModel/test/test_model.py
@@ -11,7 +11,7 @@ from Lodel.utils.mlstring import MlString
 
 from EditorialModel.backend.json_backend import EmBackendJson
 from EditorialModel.backend.dummy_backend import EmBackendDummy
-from EditorialModel.migrationhandler.dummy import DummyMigrationHandler
+from DataSource.dummy.migrationhandler import DummyMigrationHandler
 
 
 class TestModel(unittest.TestCase):
diff --git a/leapi/datasources/__init__.py b/leapi/datasources/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/leapi/test/test_lecrud.py b/leapi/test/test_lecrud.py
index ea01d4f..0dc2192 100644
--- a/leapi/test/test_lecrud.py
+++ b/leapi/test/test_lecrud.py
@@ -7,6 +7,7 @@ from unittest import TestCase
 from unittest.mock import patch
 
 import EditorialModel
+import DataSource.dummy
 import leapi
 import leapi.test.utils
 from leapi.lecrud import _LeCrud
@@ -147,7 +148,7 @@ class LeCrudTestCase(TestCase):
     #   Tests mocking the datasource
     # 
 
-    @patch('leapi.datasources.dummy.DummyDatasource.insert')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.insert')
     def test_insert(self, dsmock):
         from dyncode import Publication, Numero, LeObject, Personne, Article
         ndatas = [
@@ -166,7 +167,7 @@ class LeCrudTestCase(TestCase):
             dsmock.reset_mock()
     
     ## @todo try failing on inserting from LeClass child or LeObject
-    @patch('leapi.datasources.dummy.DummyDatasource.insert')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.insert')
     def test_insert_fails(self, dsmock):
         from dyncode import Publication, Numero, LeObject, Personne, Article
         ndatas = [
@@ -182,7 +183,7 @@ class LeCrudTestCase(TestCase):
                 assert not dsmock.called
         pass
     
-    @patch('leapi.datasources.dummy.DummyDatasource.update')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.update')
     def test_update(self, dsmock):
         from dyncode import Publication, Numero, LeObject
         
@@ -203,7 +204,7 @@ class LeCrudTestCase(TestCase):
             dsmock.assert_called_once_with(ccls, efilters, erelfilters, **qdatas)
     
     ## @todo test invalid get
-    @patch('leapi.datasources.dummy.DummyDatasource.select')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.select')
     def test_get(self, dsmock):
         from dyncode import Publication, Numero, LeObject, Textes
         
diff --git a/leapi/test/test_ledatasourcesql.py b/leapi/test/test_ledatasourcesql.py
index 95a6723..a551e2b 100644
--- a/leapi/test/test_ledatasourcesql.py
+++ b/leapi/test/test_ledatasourcesql.py
@@ -4,7 +4,7 @@ import unittest
 import sqlite3
 import pymysql
 from unittest import TestCase
-from leapi.datasources.ledatasourcesql import LeDataSourceSQL
+from DataSource.MySQL.leapidatasource import LeDataSourceSQL
 from mosql.db import Database
 
 import pymysql
diff --git a/leapi/test/test_leobject.py b/leapi/test/test_leobject.py
index 004dd0f..3ad7a5b 100644
--- a/leapi/test/test_leobject.py
+++ b/leapi/test/test_leobject.py
@@ -7,6 +7,7 @@ from unittest import TestCase
 from unittest.mock import patch
 
 import EditorialModel
+import DataSource.dummy
 import leapi
 import leapi.test.utils
 from leapi.leobject import _LeObject
@@ -104,7 +105,7 @@ class LeObjectMockDatasourceTestCase(TestCase):
         """ Remove the temporary directory created at class setup """
         leapi.test.utils.cleanup(cls.tmpdir)
     
-    @patch('leapi.datasources.dummy.DummyDatasource.insert')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.insert')
     def test_insert(self, dsmock):
         from dyncode import Publication, Numero, LeObject
         ndatas = [
@@ -122,7 +123,7 @@ class LeObjectMockDatasourceTestCase(TestCase):
             dsmock.reset_mock()
 
     @unittest.skip("Wait FieldTypes modification (cf. #90) and classmethod capabilities for update")
-    @patch('leapi.datasources.dummy.DummyDatasource.update')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.update')
     def test_update(self, dsmock):
         from dyncode import Publication, Numero, LeObject
 
@@ -148,7 +149,7 @@ class LeObjectMockDatasourceTestCase(TestCase):
             dsmock.assert_called_once_with(Numero, Publication, ds_filters, ds_relfilters, datas)
             dsmock.reset_mock()
     
-    @patch('leapi.datasources.dummy.DummyDatasource.delete')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.delete')
     def test_delete(self, dsmock):
         from dyncode import Publication, Numero, LeObject, LeType
 
diff --git a/leapi/test/test_lerelation.py b/leapi/test/test_lerelation.py
index a2502b6..0e66fc1 100644
--- a/leapi/test/test_lerelation.py
+++ b/leapi/test/test_lerelation.py
@@ -7,6 +7,7 @@ from unittest import TestCase
 from unittest.mock import patch
 
 import EditorialModel
+import DataSource.dummy
 import leapi
 import leapi.test.utils
 import leapi.lecrud as lecrud
@@ -67,7 +68,7 @@ class LeRelationTestCase(TestCase):
                 self.assertEqual(filter_res[i], res[i], "%s != %s"%(filter_res, res))
 
     @unittest.skip("Wait LeRelation._prepare_filters() and LeRelation.delete() to unskip")
-    @patch('leapi.datasources.dummy.DummyDatasource.delete')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.delete')
     def test_delete(self, dsmock):
         """ Testing LeHierarch insert method """
         from dyncode import LeCrud, Publication, Numero, Personnes, LeObject, Rubrique, LeHierarch, LeRelation
@@ -79,7 +80,7 @@ class LeRelationTestCase(TestCase):
 
 class LeHierarch(LeRelationTestCase):
     
-    @patch('leapi.datasources.dummy.DummyDatasource.select')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.select')
     def test_get(self, dsmock):
         """ Tests the LeHierarch.get() method """
         from dyncode import LeCrud, Publication, Numero, Personnes, LeObject, Rubrique, LeHierarch, LeRelation
@@ -122,7 +123,7 @@ class LeHierarch(LeRelationTestCase):
 
             dsmock.reset_mock()
     
-    @patch('leapi.datasources.dummy.DummyDatasource.insert')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.insert')
     def test_insert(self, dsmock):
         """ Testing LeHierarch insert method """
         from dyncode import LeCrud, Publication, Numero, Personnes, LeObject, Rubrique, LeHierarch, LeRelation
@@ -187,7 +188,7 @@ class LeHierarch(LeRelationTestCase):
     
 
     @unittest.skip("Wait for LeRelation.delete()")
-    @patch('leapi.datasources.dummy.DummyDatasource.delete')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.delete')
     def test_delete(self, dsmock):
         """ Testing LeHierarch insert method """
         from dyncode import LeCrud, Publication, Numero, Personnes, LeObject, Rubrique, LeHierarch, LeRelation
@@ -197,7 +198,7 @@ class LeHierarch(LeRelationTestCase):
         
     
     @unittest.skip("Wait for LeRelation.update() to unskip")
-    @patch('leapi.datasources.dummy.DummyDatasource.update')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.update')
     def test_update(self, dsmock):
         """ test LeHierach update method"""
         from dyncode import LeHierarch
@@ -209,7 +210,7 @@ class LeHierarch(LeRelationTestCase):
 class LeRel2TypeTestCase(LeRelationTestCase):
     
     @unittest.skip("Wait implementation to unskip")
-    @patch('leapi.datasources.dummy.DummyDatasource.insert')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.insert')
     def test_insert(self, dsmock):
         """ test LeHierach update method"""
         from dyncode import LeObject, Article, Textes, Personne, Personnes, LeHierarch, LeRel2Type, Rel_textes2personne
@@ -261,7 +262,7 @@ class LeRel2TypeTestCase(LeRelationTestCase):
             dsmock.reset_mock()
 
     @unittest.skip("Wait implementation to unskip")
-    @patch('leapi.datasources.dummy.DummyDatasource.insert')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.insert')
     def test_insert_fails(self, dsmock):
         """ test LeHierach update method"""
         from dyncode import LeObject, Rubrique, Numero, Article, Textes, Personne, Personnes, LeHierarch, LeRel2Type, Rel_textes2personne
diff --git a/leapi/test/test_letype.py b/leapi/test/test_letype.py
index 65724a5..a670ebb 100644
--- a/leapi/test/test_letype.py
+++ b/leapi/test/test_letype.py
@@ -8,6 +8,7 @@ from unittest.mock import patch
 
 import EditorialModel
 import leapi
+import DataSource.dummy
 import leapi.test.utils
 
 class LeTypeTestCase(TestCase):
@@ -65,7 +66,7 @@ class LeTypeMockDsTestCase(TestCase):
         """ Remove the temporary directory created at class setup """
         leapi.test.utils.cleanup(cls.tmpdir)
 
-    @patch('leapi.datasources.dummy.DummyDatasource.select')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.select')
     def test_populate(self, dsmock):
         from dyncode import Publication, Numero, LeObject
 
@@ -74,7 +75,7 @@ class LeTypeMockDsTestCase(TestCase):
         num.populate()
         dsmock.assert_called_once_with(Numero, missing_fields, [('lodel_id','=',1)],[])
 
-    @patch('leapi.datasources.dummy.DummyDatasource.update')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.update')
     def test_update(self, dsmock):
         from dyncode import Publication, Numero, LeObject
         
@@ -85,7 +86,7 @@ class LeTypeMockDsTestCase(TestCase):
         num.update(datas)
         dsmock.assert_called_once_with(Numero, [('lodel_id','=',1)], [], **datas)
     
-    @patch('leapi.datasources.dummy.DummyDatasource.delete')
+    @patch('DataSource.dummy.leapidatasource.DummyDatasource.delete')
     def test_delete(self, dsmock):
         from dyncode import Publication, Numero, LeObject
         
diff --git a/leapi/test/utils.py b/leapi/test/utils.py
index ac2cbbb..e1cab32 100644
--- a/leapi/test/utils.py
+++ b/leapi/test/utils.py
@@ -5,7 +5,7 @@ import sys
 from EditorialModel.model import Model
 import leapi
 from EditorialModel.backend.json_backend import EmBackendJson
-from leapi.datasources.dummy import DummyDatasource
+from DataSource.MySQL.leapidatasource import DummyDatasource
 from leapi.lefactory import LeFactory