Fixed persistency layer.

Now we have ODBC .. that accepts various connection string (including SQLite, MySQL,...)
  And EiffelStore+MySQL.
Updated sql scripts to work with MySQL, and SQLite.
Added a sql_statement (s: STRING): STRING that converts ROC sql statement to fit the underlying database engine.
 mostly to adapt incompatibilities such as AUTO_INCREMENT for MySQL and AUTOINCREMENT for SQLite
 by default SQL script should be written following MySQL SQL syntax.
Warning: to use ODBC persistence driver, it has to be installed on the target machine.

library/persistence/store_odbc/tests/users/user_test_set.e

@@ -0,0 +1,72 @@
+note
+	description: "[
+		Eiffel tests that can be executed by testing tool.
+	]"
+	author: "EiffelStudio test wizard"
+	date: "$Date: 2015-01-27 19:15:02 +0100 (mar., 27 janv. 2015) $"
+	revision: "$Revision: 96542 $"
+	testing: "type/manual"
+
+class
+	USER_TEST_SET
+
+inherit
+	EQA_TEST_SET
+		redefine
+			on_prepare,
+			on_clean
+		select
+			default_create
+		end
+	ABSTRACT_DB_TEST
+		rename
+			default_create as default_db_test
+		end
+
+
+feature {NONE} -- Events
+
+	on_prepare
+			-- <Precursor>
+		do
+			(create {CLEAN_DB}).clean_db(connection)
+			storage.new_user (custom_user ("admin", "admin","admin@admin.com"))
+		end
+
+	on_clean
+			-- <Precursor>
+		do
+		end
+
+feature -- Test routines
+
+	test_user_exist
+			-- User admin exist			
+		do
+			assert ("Not void",  attached storage.user_by_email ("admin@admin.com"))
+			assert ("Not void",  attached storage.user_by_id (1))
+			assert ("Not void",  attached storage.user_by_name ("admin"))
+		end
+
+	test_user_not_exist
+			-- Uset test does not exist.
+		do
+			assert ("Void", storage.user_by_email ("test@admin.com") = Void)
+			assert ("Void", storage.user_by_id (2) = Void )
+			assert ("Void", storage.user_by_name ("test") = Void)
+		end
+
+	test_new_user
+		do
+			storage.new_user (custom_user ("test", "test","test@admin.com"))
+			assert ("Not void",  attached storage.user_by_email ("test@admin.com"))
+			assert ("Not void",  attached storage.user_by_id (2))
+			assert ("Not void",  attached storage.user_by_id (2) as l_user and then l_user.id = 2 and then l_user.name ~ "test")
+			assert ("Not void",  attached storage.user_by_name ("test"))
+		end
+
+
+
+end
+
+