Custom RFC

I am not a ABAP developer but working on MS SQL 2005 BI side but I need something like this from ECC 6.0

I will request if anyone can guide me building a custom RFC with simple select statment

i.e.

select * from Table_Name

where Field_Name between @StartDateofLastMonth and @EndDateofLastMonth.

The aforesaid select statment will get the calculated startdate and enddate from sap system date.

where as i have to give @Table_Name and @Field_Name from my end as variable...

One more favor where i can get sample RFC for the aforesaid.