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_mysql/tests/handler/database_handler_test.e

@@ -0,0 +1,81 @@
+note
+	description: "[
+		Eiffel tests that can be executed by testing tool.
+	]"
+	author: "EiffelStudio test wizard"
+	date: "$Date$"
+	revision: "$Revision$"
+	testing: "type/manual"
+
+class
+	DATABASE_HANDLER_TEST
+
+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)
+		end
+
+	on_clean
+			-- <Precursor>
+		do
+		end
+
+
+feature -- Test routines
+
+	test_wrong_database_query
+			-- New test routine
+		local
+			l_parameters: STRING_TABLE[detachable ANY]
+		do
+			create l_parameters.make (0)
+			handler.set_query (create {DATABASE_QUERY}.data_reader ("Sellect from users", l_parameters))
+			handler.execute_query
+		    assert ("Has error:", handler.has_error)
+		end
+
+
+
+	test_sequences_of_wrong_and_correct_queries
+			-- New test routine
+		local
+			l_parameters: STRING_TABLE[detachable ANY]
+		do
+			create l_parameters.make (0)
+			handler.set_query (create {DATABASE_QUERY}.data_reader ("Sellect from users;", l_parameters))
+			handler.execute_query
+		    assert ("Has error:", handler.has_error)
+
+			handler.set_query (create {DATABASE_QUERY}.data_reader ("Select * from users;", l_parameters))
+			handler.execute_query
+		    assert ("Not Has error:",not handler.has_error)
+		end
+
+
+feature -- Handler
+
+ 	handler: DATABASE_HANDLER
+ 		once
+ 			create {DATABASE_HANDLER_IMPL} Result.make (connection )
+ 		end
+
+end
+
+