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The subscription model is based on how the subscriber identifies the events of interest. There are many ways to categorize subscription models. For example, JEDI24 identifies four categories, called subscription approaches: channel subscriptions, subject subscriptions, content subscriptions, and event combination subscriptions. Each identifies the events of interest to the subscriber in a different way. Many systems allow subscribers to be organized into groups.25 The group is an entity that subscribes to certain events. Subscribers need only to specify which group or groups they are members of. The notion is similar to people signing up to newsgroups. Each newsgroup implicitly defines certain types of messages, so people determine the types of messages they get by choosing a newsgroup rather than defining specific message types. The subscription models I use in this book appear in the hierarchy shown in Figure 2-7.

The template uses the pseudo column rownum to restrict the window of rows between the values :min_row_number and :max_row_number. The clause /*+ FIRST_ROWS */ is a hint to the optimizer to generate a plan of execution, the goal of which is to return the first rows as soon as possible. This is almost always the requirement, since you are trying to display n rows of the result set to the end user as soon as you can, instead of trying to get the entire set of rows and then displaying the window of n rows. Let s walk through an example. First, we create and populate a table, t2, which has a number column, x, and a date column, y: scott@ORA10G> create table t2 as 2 select rownum as x, sysdate+rownum as y 3 from all_objects; Table created. scott@ORA10G> commit; Commit complete. scott@ORA10G> desc t2 Name Null Type ------- -------- ----------X NUMBER Y DATE scott@ORA10G> select count(*) from t2; 41013 Assume that our user interface displays the columns x and y, and allows the user to paginate ten rows at a time. We also allow the user to sort by column x or y. The query that we issue using the preceding template would look like the following: select * from ( select /*+ FIRST_ROWS */ a.*, rownum rnum from ( select x, y from t2 order by x, y ) a where rownum <= :max_row_number ) where rnum >= :min_row_number; Using the preceding query form, we create a package, demo_pagination, with a single procedure, get_details, that fulfills our requirements. The procedure takes four parameters: two numbers representing minimum and maximum row numbers that need to be displayed, one string representing our order by clause, and a ref cursor out parameter that contains our result set with the rows.

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In your pivot table, the OrderDate field is in the Row Labels area. You selected the date cells, and formatted them as dd-mmm-yy. When you added the Product field to the Row Labels area, the OrderDate subtotals used the mmm-yy date format, like the dates in the source data table. You want the subtotals to use the dd-mmm-yy format. This example is based on the Subtotals.xlsx workbook.

24. Gianpaolo Cugola, Elisabetta Di Nitto, and Alfonso Fuggetta, The JEDI Event-Based Infrastructure and Its Application to the Development of the OPSS WFMS, IEEE Transactions on Software Engineering, September 2001. 25. Daniel J. Barrett, Lori A. Clarke, Peri L. Tarr, and Alexander E. Wise, A Framework for Event-Based Software Integration, ACM Transactions on Software Engineering and Methodology, October 1996.

scott@ORA10G> create or replace package demo_pagination 2 as 3 procedure get_details( p_min_row_number in number, 4 p_max_row_number in number, p_order_by_clause in varchar2, 5 p_cursor in out sys_refcursor ); 6 end; 7 / Package created. The package body first declares a string with our query with the where clause appended to it: scott@ORA10G> create or replace package body demo_pagination 2 as 3 procedure get_details( p_min_row_number in number, 4 p_max_row_number in number, p_order_by_clause in varchar2, 5 p_cursor in out sys_refcursor ) 6 is 7 l_our_select_str long; 8 l_pagination_select_str long; 9 begin 10 l_our_select_str := 'select x, y from t2 ' || p_order_by_clause; We then declare the actual pagination query that we will construct dynamically: 11 12 13 14 15 16 17 18 19 20 l_pagination_select_str := 'select x, y ' || 'from ' || '( ' || ' select /*+ FIRST_ROWS */ a.*, rownum rnum ' || ' from ' || ' (' || l_our_select_str || ' ) a ' || ' where rownum <= :max_row_number ' || ') ' || ' where rnum >= :min_row_number'; We print out the relevant variables in case we want to test them from SQL*Plus: 21 22 dbms_output.put_line( l_our_select_str ); dbms_output.put_line( l_pagination_select_str );

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