--
-- packages/acs-kernel/sql/acs-relationships-create.sql
--
-- XXX Fill this in later.
--
-- @creation-date 2000-08-13
--
-- @author rhs@mit.edu
--
-- @cvs-id $Id: acs-relationships-create.sql,v 1.34 2018/11/01 08:38:00 gustafn Exp $
--
----------------------------------------------------------------
-- KNOWLEDGE LEVEL: RELATIONSHIP TYPES AND RELATIONSHIP RULES --
----------------------------------------------------------------
create table acs_rel_roles (
role varchar(100) not null
constraint acs_rel_roles_role_pk primary key,
pretty_name varchar(100) not null,
pretty_plural varchar(100) not null
);
create table acs_rel_types (
rel_type varchar(1000) not null
constraint acs_rel_types_rel_type_pk primary key
constraint acs_rel_types_rel_type_fk
references acs_object_types(object_type),
object_type_one varchar(1000) not null
constraint acs_rel_types_obj_type_1_fk
references acs_object_types (object_type),
role_one varchar(100) constraint acs_rel_types_role_one_fk
references acs_rel_roles (role),
min_n_rels_one integer default 0 not null
constraint acs_rel_types_min_n_1_ck
check (min_n_rels_one >= 0),
max_n_rels_one integer
constraint acs_rel_types_max_n_1_ck
check (max_n_rels_one >= 0),
object_type_two varchar(1000) not null
constraint acs_rel_types_obj_type_2_fk
references acs_object_types (object_type),
role_two varchar(100) constraint acs_rel_types_role_two_fk
references acs_rel_roles (role),
min_n_rels_two integer default 0 not null
constraint acs_rel_types_min_n_2_ck
check (min_n_rels_two >= 0),
max_n_rels_two integer
constraint acs_rel_types_max_n_2_ck
check (max_n_rels_two >= 0),
composable_p boolean
default 't' not null,
constraint acs_rel_types_n_rels_one_ck
check (min_n_rels_one <= max_n_rels_one),
constraint acs_rel_types_n_rels_two_ck
check (min_n_rels_two <= max_n_rels_two)
);
create index acs_rel_types_objtypeone_idx on acs_rel_types (object_type_one);
create index acs_rel_types_role_one_idx on acs_rel_types (role_one);
create index acs_rel_types_objtypetwo_idx on acs_rel_types (object_type_two);
create index acs_rel_types_role_two_idx on acs_rel_types (role_two);
comment on table acs_rel_types is $$
Each row in <code>acs_rel_types</code> represents a type of
relationship between objects. For example, the following DML
statement:
<blockquote><pre>
insert into acs_rel_types
(rel_type,
object_type_one, role_one, min_n_rels_one, max_n_rels_one,
object_type_two, role_two, min_n_rels_two, max_n_rels_two)
values
('employment',
'person', 'employee', 0, null,
'company', 'employer', 0, null)
</pre></blockquote>
defines an "employment" relationship type that can be expressed
in natural language as:
<blockquote>
A person may be the employee of zero or more companies, and a company
may be the employer of zero or more people.
</blockquote>
$$;
-- added
select define_function_args('acs_rel_type__create_role','role,pretty_name;null,pretty_plural;null');
--
-- procedure acs_rel_type__create_role/3
--
CREATE OR REPLACE FUNCTION acs_rel_type__create_role(
create_role__role varchar,
create_role__pretty_name varchar, -- default null
create_role__pretty_plural varchar -- default null
) RETURNS integer AS $$
DECLARE
BEGIN
insert into acs_rel_roles
(role, pretty_name, pretty_plural)
values
(create_role__role, coalesce(create_role__pretty_name,create_role__role), coalesce(create_role__pretty_plural,create_role__role));
return 0;
END;
$$ LANGUAGE plpgsql;
--
-- procedure acs_rel_type__create_role/1
--
CREATE OR REPLACE FUNCTION acs_rel_type__create_role(
create_role__role varchar
) RETURNS integer AS $$
DECLARE
BEGIN
perform acs_rel_type__create_role(create_role__role, NULL, NULL);
return 0;
END;
$$ LANGUAGE plpgsql;
-- procedure drop_role
-- added
select define_function_args('acs_rel_type__drop_role','role');
--
-- procedure acs_rel_type__drop_role/1
--
CREATE OR REPLACE FUNCTION acs_rel_type__drop_role(
drop_role__role varchar
) RETURNS integer AS $$
DECLARE
BEGIN
delete from acs_rel_roles
where role = drop_role__role;
return 0;
END;
$$ LANGUAGE plpgsql;
-- function role_pretty_name
-- added
select define_function_args('acs_rel_type__role_pretty_name','role');
--
-- procedure acs_rel_type__role_pretty_name/1
--
CREATE OR REPLACE FUNCTION acs_rel_type__role_pretty_name(
role_pretty_name__role varchar
) RETURNS varchar AS $$
DECLARE
v_pretty_name acs_rel_roles.pretty_name%TYPE;
BEGIN
select r.pretty_name into v_pretty_name
from acs_rel_roles r
where r.role = role_pretty_name__role;
return v_pretty_name;
END;
$$ LANGUAGE plpgsql stable strict;
-- function role_pretty_plural
-- added
select define_function_args('acs_rel_type__role_pretty_plural','role');
--
-- procedure acs_rel_type__role_pretty_plural/1
--
CREATE OR REPLACE FUNCTION acs_rel_type__role_pretty_plural(
role_pretty_plural__role varchar
) RETURNS varchar AS $$
DECLARE
v_pretty_plural acs_rel_roles.pretty_plural%TYPE;
BEGIN
select r.pretty_plural into v_pretty_plural
from acs_rel_roles r
where r.role = role_pretty_plural__role;
return v_pretty_plural;
END;
$$ LANGUAGE plpgsql stable strict;
-- procedure create_type
-- procedure create_type
-- acs_rel_type__create_type /15 vs. /16 has
-- /15 has no "roles" (one and two), but "type_extension_table"
-- /16
-- pos 1-7: same as /15
-- pos 08: object_type_one (varchar)
-- pos 09: role_one (varchar)
-- pos 10: min_n_rels_one (integer)
-- pos 11: max_n_rels (integer)
-- pos 12: object_type_one (varchar)
-- pos 13: role_two (varchar)
-- pos 14: min_n_rels_two (integer)
-- pos 15: max_n_rels_two (integer)
-- pos 16: composable_p (boolean)
-- /15
-- pos 1-7: same as /15
-- pos 08: type_extension_table (varchar)
-- pos 09: object_type_one (varchar)
-- pos 10: min_n_rels_one (integer)
-- pos 11: max_n_rels (integer)
-- pos 12: object_type_two (varchar)
-- pos 13: min_n_rels_two (integer)
-- pos 14: max_n_rels_two (integer)
-- pos 15: composable_p (boolean)
select define_function_args('acs_rel_type__create_type','rel_type,pretty_name,pretty_plural,supertype;relationship,table_name,id_column,package_name,object_type_one,role_one;null,min_n_rels_one,max_n_rels_one,object_type_two,role_two;null,min_n_rels_two,max_n_rels_two,composable_p;t');
--
-- procedure acs_rel_type__create_type/16
--
CREATE OR REPLACE FUNCTION acs_rel_type__create_type(
create_type__rel_type varchar,
create_type__pretty_name varchar,
create_type__pretty_plural varchar,
create_type__supertype varchar, -- default 'relationship'
create_type__table_name varchar,
create_type__id_column varchar,
create_type__package_name varchar,
create_type__object_type_one varchar,
create_type__role_one varchar, -- default null
create_type__min_n_rels_one integer,
create_type__max_n_rels_one integer,
create_type__object_type_two varchar,
create_type__role_two varchar, -- default null
create_type__min_n_rels_two integer,
create_type__max_n_rels_two integer,
create_type__composable_p boolean default true
) RETURNS integer AS $$
DECLARE
type_extension_table acs_object_types.type_extension_table%TYPE default null;
abstract_p acs_object_types.abstract_p%TYPE default 'f';
name_method acs_object_types.name_method%TYPE default null;
BEGIN
PERFORM acs_object_type__create_type(
create_type__rel_type,
create_type__pretty_name,
create_type__pretty_plural,
create_type__supertype,
create_type__table_name,
create_type__id_column,
create_type__package_name,
abstract_p,
type_extension_table,
name_method
);
insert into acs_rel_types
(rel_type,
object_type_one, role_one,
min_n_rels_one, max_n_rels_one,
object_type_two, role_two,
min_n_rels_two, max_n_rels_two,
composable_p)
values
(create_type__rel_type,
create_type__object_type_one, create_type__role_one,
create_type__min_n_rels_one, create_type__max_n_rels_one,
create_type__object_type_two, create_type__role_two,
create_type__min_n_rels_two, create_type__max_n_rels_two,
create_type__composable_p);
return 0;
END;
$$ LANGUAGE plpgsql;
--
-- procedure acs_rel_type__create_type/15
--
CREATE OR REPLACE FUNCTION acs_rel_type__create_type(
create_type__rel_type varchar,
create_type__pretty_name varchar,
create_type__pretty_plural varchar,
create_type__supertype varchar, -- default 'relationship'
create_type__table_name varchar,
create_type__id_column varchar,
create_type__package_name varchar,
create_type__type_extension_table varchar, -- default null
create_type__object_type_one varchar,
create_type__min_n_rels_one integer,
create_type__max_n_rels_one integer,
create_type__object_type_two varchar,
create_type__min_n_rels_two integer,
create_type__max_n_rels_two integer,
create_type__composable_p boolean default true
) RETURNS integer AS $$
DECLARE
abstract_p acs_object_types.abstract_p%TYPE default 'f';
name_method acs_object_types.name_method%TYPE default null;
create_type__role_one acs_rel_types.role_one%TYPE default null;
create_type__role_two acs_rel_types.role_two%TYPE default null;
BEGIN
PERFORM acs_object_type__create_type(
create_type__rel_type,
create_type__pretty_name,
create_type__pretty_plural,
create_type__supertype,
create_type__table_name,
create_type__id_column,
create_type__package_name,
abstract_p,
create_type__type_extension_table,
name_method
);
insert into acs_rel_types
(rel_type,
object_type_one, role_one,
min_n_rels_one, max_n_rels_one,
object_type_two, role_two,
min_n_rels_two, max_n_rels_two,
composable_p)
values
(create_type__rel_type,
create_type__object_type_one, create_type__role_one,
create_type__min_n_rels_one, create_type__max_n_rels_one,
create_type__object_type_two, create_type__role_two,
create_type__min_n_rels_two, create_type__max_n_rels_two,
create_type__composable_p);
return 0;
END;
$$ LANGUAGE plpgsql;
-- procedure drop_type
-- added
select define_function_args('acs_rel_type__drop_type','rel_type,cascade_p;f');
--
-- procedure acs_rel_type__drop_type/2
--
CREATE OR REPLACE FUNCTION acs_rel_type__drop_type(
drop_type__rel_type varchar,
drop_type__cascade_p boolean -- default 'f'
) RETURNS integer AS $$
DECLARE
v_cascade_p boolean;
BEGIN
-- XXX do cascade_p.
-- JCD: cascade_p seems to be ignored in acs_o_type__drop_type anyway...
if drop_type__cascade_p is null then
v_cascade_p := 'f';
else
v_cascade_p := drop_type__cascade_p;
end if;
delete from acs_rel_types
where rel_type = drop_type__rel_type;
PERFORM acs_object_type__drop_type(drop_type__rel_type,
v_cascade_p);
return 0;
END;
$$ LANGUAGE plpgsql;
-- show errors
select acs_rel_type__create_type (
'relationship',
'Relationship',
'Relationships',
'acs_object',
'acs_rels',
'rel_id',
'acs_rel',
'acs_rel_types',
'acs_object',
0,
null::integer,
'acs_object',
0,
null::integer
);
-- show errors
--------------------------------------
-- OPERATIONAL LEVEL: RELATIONSHIPS --
--------------------------------------
create sequence t_acs_rel_id_seq;
create view acs_rel_id_seq as
select nextval('t_acs_rel_id_seq') as nextval;
create table acs_rels (
rel_id integer not null
constraint acs_rels_rel_id_fk
references acs_objects (object_id)
on delete cascade
constraint acs_rels_rel_id_pk primary key,
rel_type varchar(100) not null
constraint acs_rels_rel_type_fk
references acs_rel_types (rel_type),
object_id_one integer not null
constraint acs_rels_object_id_one_fk
references acs_objects (object_id)
on delete cascade,
object_id_two integer not null
constraint acs_rels_object_id_two_fk
references acs_objects (object_id)
on delete cascade,
constraint acs_object_rels_un unique
(rel_type, object_id_one, object_id_two)
);
create index acs_rels_object_id_one_idx on acs_rels (object_id_one);
create index acs_rels_object_id_two_idx on acs_rels (object_id_two);
comment on table acs_rels is '
The acs_rels table is essentially a generic mapping table for
acs_objects. Once we come up with a way to associate attributes with
relationship types, we could replace many of the ACS 3.x mapping
tables like user_content_map, user_group_map, and
user_group_type_modules_map with this one table. Much application
logic consists of asking questions like "Does object X have a
relationship of type Y to object Z?" where all that differs is
X, Y, and Z. Thus, the value of consolidating many mapping tables
into one is that we can provide a generic API for defining and
querying relationships. In addition, we may need to design a way to
enable "type_specific" storage for relationships (i.e., foreign key
columns for one-to-many relationships and custom mapping tables for
many-to-many relationships), instead of only supporting "generic"
storage in the acs_rels table. This would parallel what we do with
acs_attributes.
';
----------------------------
-- Application Data Links --
----------------------------
create sequence acs_data_links_seq start with 1;
create table acs_data_links (
rel_id integer not null
constraint acs_data_links_rel_id_pk primary key,
object_id_one integer not null
constraint acs_data_links_obj_one_fk
references acs_objects (object_id)
on delete cascade,
object_id_two integer not null
constraint acs_data_links_obj_two_fk
references acs_objects (object_id)
on delete cascade,
relation_tag varchar(100),
constraint acs_data_links_un unique
(object_id_one, object_id_two, relation_tag)
);
create index acs_data_links_id_one_idx on acs_data_links (object_id_one);
create index acs_data_links_id_two_idx on acs_data_links (object_id_two);
create index acs_data_links_rel_tag_idx on acs_data_links (relation_tag);
--------------
-- TRIGGERS --
--------------
-- added by oumi@arsdigita.com - Jan 11, 2001
--
-- procedure acs_rels_in_tr/0
--
CREATE OR REPLACE FUNCTION acs_rels_in_tr(
) RETURNS trigger AS $$
DECLARE
dummy integer;
target_object_type_one acs_object_types.object_type%TYPE;
target_object_type_two acs_object_types.object_type%TYPE;
actual_object_type_one acs_object_types.object_type%TYPE;
actual_object_type_two acs_object_types.object_type%TYPE;
BEGIN
-- DRB: The obvious rewrite to use Dan's port of this to use tree_ancestor_keys kills
-- Postgres!!! Argh!!! This is fast, to, so there ...
-- Get all the object type info from the relationship.
select rt.object_type_one, rt.object_type_two,
o1.object_type, o2.object_type
into target_object_type_one, target_object_type_two,
actual_object_type_one, actual_object_type_two
from acs_rel_types rt, acs_objects o1, acs_objects o2
where rt.rel_type = new.rel_type
and o1.object_id = new.object_id_one
and o2.object_id = new.object_id_two;
if not exists (select 1
from
(select tree_ancestor_keys(acs_object_type_get_tree_sortkey(actual_object_type_one))
as tree_sortkey) parents1,
(select tree_ancestor_keys(acs_object_type_get_tree_sortkey(actual_object_type_two))
as tree_sortkey) parents2,
(select tree_sortkey from acs_object_types where object_type = target_object_type_one)
root1,
(select tree_sortkey from acs_object_types where object_type = target_object_type_two)
root2
where root1.tree_sortkey = parents1.tree_sortkey
and root2.tree_sortkey = parents2.tree_sortkey) then
raise EXCEPTION '-20001: % violation: Invalid object types. Object % (%) must be of type % Object % (%) must be of type %', new.rel_type,
new.object_id_one,
actual_object_type_one,
target_object_type_one,
new.object_id_two,
actual_object_type_two,
target_object_type_two;
end if;
return new;
END;
$$ LANGUAGE plpgsql;
create trigger acs_rels_in_tr before insert or update on acs_rels
for each row execute procedure acs_rels_in_tr ();
-- show errors
-- create or replace package acs_rel
-- as
--
-- function new (
-- rel_id in acs_rels.rel_id%TYPE default null,
-- rel_type in acs_rels.rel_type%TYPE default 'relationship',
-- object_id_one in acs_rels.object_id_one%TYPE,
-- object_id_two in acs_rels.object_id_two%TYPE,
-- context_id in acs_objects.context_id%TYPE default null,
-- creation_user in acs_objects.creation_user%TYPE default null,
-- x creation_ip in acs_objects.creation_ip%TYPE default null
-- ) return acs_rels.rel_id%TYPE;
--
-- procedure delete (
-- rel_id in acs_rels.rel_id%TYPE
-- );
--
-- end;
-- show errors
-- create or replace package body acs_rel
-- function new
select define_function_args('acs_rel__new','rel_id;null,rel_type;relationship,object_id_one,object_id_two,context_id;null,creation_user;null,creation_ip;null');
--
-- procedure acs_rel__new/7
--
CREATE OR REPLACE FUNCTION acs_rel__new(
new__rel_id integer, -- default null
new__rel_type varchar, -- default 'relationship'
new__object_id_one integer,
new__object_id_two integer,
context_id integer, -- default null
creation_user integer, -- default null
creation_ip varchar -- default null
) RETURNS integer AS $$
DECLARE
v_rel_id acs_rels.rel_id%TYPE;
BEGIN
v_rel_id := acs_object__new (
new__rel_id,
new__rel_type,
now(),
creation_user,
creation_ip,
context_id,
't',
new__rel_type || ': ' || new__object_id_one || ' - ' || new__object_id_two,
null
);
insert into acs_rels
(rel_id, rel_type, object_id_one, object_id_two)
values
(v_rel_id, new__rel_type, new__object_id_one, new__object_id_two);
return v_rel_id;
END;
$$ LANGUAGE plpgsql;
-- procedure delete
select define_function_args('acs_rel__delete','rel_id');
--
-- procedure acs_rel__delete/1
--
CREATE OR REPLACE FUNCTION acs_rel__delete(
rel_id integer
) RETURNS integer AS $$
DECLARE
BEGIN
PERFORM acs_object__delete(rel_id);
return 0;
END;
$$ LANGUAGE plpgsql;
-----------
-- VIEWS --
-----------
-- These views are handy for metadata driven UI
-- View: rel_types_valid_obj_one_types
--
-- Question: Given rel_type :rel_type,
--
-- What are all the valid object_types for object_id_one of
-- a relation of type :rel_type
--
-- Answer: select object_type
-- from rel_types_valid_obj__one_types
-- where rel_type = :rel_type
--
create view rel_types_valid_obj_one_types as
select rt.rel_type, th.object_type
from acs_rel_types rt,
(select object_type, ancestor_type
from acs_object_type_supertype_map
UNION ALL
select object_type, object_type as ancestor_type
from acs_object_types) th
where rt.object_type_one = th.ancestor_type;
-- View: rel_types_valid_obj_two_types
--
-- Question: Given rel_type :rel_type,
--
-- What are all the valid object_types for object_id_two of
-- a relation of type :rel_type
--
-- Answer: select object_type
-- from rel_types_valid_obj_two_types
-- where rel_type = :rel_type
--
create view rel_types_valid_obj_two_types as
select rt.rel_type, th.object_type
from acs_rel_types rt,
(select object_type, ancestor_type
from acs_object_type_supertype_map
UNION ALL
select object_type, object_type as ancestor_type
from acs_object_types) th
where rt.object_type_two = th.ancestor_type;
OpenACS – The Toolkit for Online Communities : ACS API Browser : ACS Kernel 5.10.0d9 : acs-relationships-create.sql
Begin main content
