-- packages/acs-events/sql/recurrence-create.sql -- -- Support for temporal recurrences -- -- @author W. Scott Meeks -- -- $Id: recurrence-create.sql,v 1.1 2002/07/09 17:34:58 rmello Exp $ -- Sequence for recurrence tables create sequence recurrence_sequence start 1; create view recurrence_seq as select nextval('recurrence_sequence') as nextval; -- These columns describe how an event recurs. The are modeled on the Palm DateBook. -- The interval_type 'custom' indicates that the PL/SQL function referenced in -- custom_func should be used to generate the recurrences. create table recurrence_interval_types ( interval_type integer constraint recurrence_interval_type_pk primary key, interval_name varchar(50) not null constraint rit_interval_name_un unique ); -- Magic values insert into recurrence_interval_types values (1,'day'); insert into recurrence_interval_types values (2,'week'); insert into recurrence_interval_types values (3,'month_by_date'); insert into recurrence_interval_types values (4,'month_by_day'); insert into recurrence_interval_types values (5,'last_of_month'); insert into recurrence_interval_types values (6,'year'); insert into recurrence_interval_types values (7,'custom'); -- Main table create table recurrences ( recurrence_id integer constraint recurrences_pk primary key, -- -- Indicate the interval type for recurrence (see above) -- -- JS: Postgres does not like it if the data type of the -- JS: column is not specified. interval_type integer constraint recurs_interval_type_fk references recurrence_interval_types constraint recurs_interval_type_nn not null, -- -- Indicates how many of the given intervals between recurrences. -- Must be a positive number! -- every_nth_interval integer constraint recurs_every_nth_interval_ck check(every_nth_interval > 0), -- -- If recurring on a weekly basis (interval_type = 'week') -- indicates which days of the week the event recurs on. -- This is represented as a space separated list of numbers -- corresponding to days of the week, where 0 corresponds to -- Sunday, 1 to Monday, and so on. Null indicates no days are set. -- So for example, '1' indicates recur on Mondays, '3 5' indicates -- recur on Wednesday and Friday. -- days_of_week varchar(20), -- -- Indicates when this event should stop recurring. Null indicates -- recur indefinitely. -- recur_until timestamp, -- -- Recurring events can be only partially populated if fully populating -- the events would require inserting too many instances. This -- column indicates up to what date this event has recurred. This -- allows further instances to be added if the user attempts to view -- a date beyond db_populated_until. If recur_until is not null, -- then this column will always be prior to or the same as recur_until. -- This column will be null until some recurrences have been added. -- db_populated_until timestamp, -- -- This column holds the name of a PL/SQL function that will be called -- to generate dates of recurrences if interval_type is 'custom' -- custom_func varchar(255) ); -- This is important to prevent locking on update of master table. -- See http://www.arsdigita.com/bboard/q-and-a-fetch-msg.tcl?msg_id=000KOh create index recurrences_interval_type_idx on recurrences(interval_type); comment on table recurrences is ' Desribes how an event recurs. '; comment on column recurrences.interval_type is ' One of day, week, month_by_date, month_by_day, last_of_month, year, custom. '; comment on column recurrences.every_nth_interval is ' Indicates how many of the given intervals between recurrences. '; comment on column recurrences.days_of_week is ' For weekly recurrences, stores which days of the week the event recurs on. '; comment on column recurrences.recur_until is ' Indicates when this event should stop recurring. Null indicates recur indefinitely. '; comment on column recurrences.db_populated_until is ' Indicates the date of the last recurrence added. Used to determine if more recurrences need to be added. '; comment on column recurrences.custom_func is ' Stores the name of a PL/SQL function that can be called to generate dates for special recurrences. '; -- Recurrence API -- -- Currently supports only new and delete methods. -- create function recurrence__new ( -- -- Creates a new recurrence -- -- @author W. Scott Meeks -- -- @param interval_type Sets interval_type of new recurrence -- @param every_nth_interval Sets every_nth_interval of new recurrence -- @param days_of_week Sets days_of_week of new recurrence -- @param recur_until Sets recur_until of new recurrence -- @param custom_func Sets name of custom recurrence function -- -- @return id of new recurrence -- varchar, -- recurrence_interval_types.interval_name%TYPE, integer, -- recurrences.every_nth_interval%TYPE, varchar, -- recurrences.days_of_week%TYPE default null, timestamp, -- recurrences.recur_until%TYPE default null, varchar -- recurrences.custom_func%TYPE default null ) returns integer as ' -- recurrences.recurrence_id%TYPE declare new__interval_name alias for $1; new__every_nth_interval alias for $2; new__days_of_week alias for $3; -- default null, new__recur_until alias for $4; -- default null, new__custom_func alias for $5; -- default null v_recurrence_id recurrences.recurrence_id%TYPE; v_interval_type_id recurrence_interval_types.interval_type%TYPE; begin select recurrence_seq.nextval into v_recurrence_id from dual; select interval_type into v_interval_type_id from recurrence_interval_types where interval_name = new__interval_name; insert into recurrences (recurrence_id, interval_type, every_nth_interval, days_of_week, recur_until, custom_func) values (v_recurrence_id, v_interval_type_id, new__every_nth_interval, new__days_of_week, new__recur_until, new__custom_func); return v_recurrence_id; end;' language 'plpgsql'; create function recurrence__delete ( -- -- Deletes the recurrence -- Note: this will fail if there are any events_with this recurrence -- because of foreign key constraints. use acs-events__delete instead -- -- @author W. Scott Meeks -- -- @param recurrence_id id of recurrence to delete -- -- @return 0 (procedure dummy) -- integer -- in recurrences.recurrence_id%TYPE ) returns integer as ' declare delete__recurrence_id alias for $1; begin delete from recurrences where recurrence_id = delete__recurrence_id; return 0; end;' language 'plpgsql';