Calling a stored procedure before row update without using triggers

Question

I have got two tables Main Table(Table1) and History Table(Table2), whenever an update is done on Table1 i want to insert the old row before update to Table2, so that i have history available for that record.
My doubt is
how to refer to old value (values b4 update) in a stored procedure?
how to call a stored procedure b4 every row update(on the database side as we do with tiggers)?
I want to write a stored procedure where in i will insert the old row values ( value b4 update ) to Table2.
Any Help would be great....

Answer 1

sample code calling procedure before insert:
DriverManager.registerDriver(new someDriver);
Connection conn = DriverManager.getConnection(driver,uname,pword);
CallableStatement cs = conn.prepareCall("{call procedureName(?,?)}");
          cs.setString(1,userName);
          cs.registerOutParameter(2,Types.VARCHAR);
          cs.execute();
          success = cs.getString(2);
          PreparedStatement pstmt = conn.prepareStatement("insert into sometable values(?,?)");
          pstmt.setString(1,userName);
          pstmt.setString(2,password);
          pstmt.executeUpdate();     
          conn.commit();      
          cs.close();
       conn.close();