rules.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

select * from rtest_vview4 order by a, b;
 a |   b    | refcount 
---+--------+----------
 2 | item 2 |        2
 4 | item 4 |        1
 5 | item 5 |        1
 7 | item 7 |        4
(4 rows)

select * from rtest_vview5;
 a |   b    | refcount 
---+--------+----------
 1 | item 1 |        0
 2 | item 2 |        2
 3 | item 3 |        0
 4 | item 4 |        1
 5 | item 5 |        1
 6 | item 6 |        0
 7 | item 7 |        4
 8 | item 8 |        0
(8 rows)

insert into rtest_view3 select * from rtest_vview1 where a < 7;
select * from rtest_view3;
 a |   b    
---+--------
 2 | item 2
 4 | item 4
 5 | item 5
(3 rows)

delete from rtest_view3;
insert into rtest_view3 select * from rtest_vview2 where a != 5 and b !~ '2';
select * from rtest_view3;
 a |   b    
---+--------
 1 | item 1
 3 | item 3
 7 | item 7
 8 | item 8
(4 rows)

delete from rtest_view3;
insert into rtest_view3 select * from rtest_vview3;
select * from rtest_view3;
 a |   b    
---+--------
 2 | item 2
 5 | item 5
 7 | item 7
(3 rows)

delete from rtest_view3;
insert into rtest_view4 select * from rtest_vview4 where 3 > refcount;
select * from rtest_view4 order by a, b;
 a |   b    | c 
---+--------+---
 2 | item 2 | 2
 4 | item 4 | 1
 5 | item 5 | 1
(3 rows)

delete from rtest_view4;
insert into rtest_view4 select * from rtest_vview5 where a > 2 and refcount = 0;
select * from rtest_view4;
 a |   b    | c 
---+--------+---
 3 | item 3 | 0
 6 | item 6 | 0
 8 | item 8 | 0
(3 rows)

delete from rtest_view4;
--
-- Test for computations in views
--
create table rtest_comp (
	part	text,
	unit	char(4),
	size	float
);
create table rtest_unitfact (
	unit	char(4),
	factor	float
);
create view rtest_vcomp as 
	select X.part, (X.size * Y.factor) as size_in_cm
			from rtest_comp X, rtest_unitfact Y
			where X.unit = Y.unit;
insert into rtest_unitfact values ('m', 100.0);
insert into rtest_unitfact values ('cm', 1.0);
insert into rtest_unitfact values ('inch', 2.54);
insert into rtest_comp values ('p1', 'm', 5.0);
insert into rtest_comp values ('p2', 'm', 3.0);
insert into rtest_comp values ('p3', 'cm', 5.0);
insert into rtest_comp values ('p4', 'cm', 15.0);
insert into rtest_comp values ('p5', 'inch', 7.0);
insert into rtest_comp values ('p6', 'inch', 4.4);
select * from rtest_vcomp order by part;
 part | size_in_cm 
------+------------
 p1   |        500
 p2   |        300
 p3   |          5
 p4   |         15
 p5   |      17.78
 p6   |     11.176
(6 rows)

select * from rtest_vcomp where size_in_cm > 10.0 order by size_in_cm using >;
 part | size_in_cm 
------+------------
 p1   |        500
 p2   |        300
 p5   |      17.78
 p4   |         15
 p6   |     11.176
(5 rows)

--
-- In addition run the (slightly modified) queries from the
-- programmers manual section on the rule system.
--
CREATE TABLE shoe_data (
	shoename   char(10),      -- primary key
	sh_avail   integer,       -- available # of pairs
	slcolor    char(10),      -- preferred shoelace color
	slminlen   float,         -- miminum shoelace length
	slmaxlen   float,         -- maximum shoelace length
	slunit     char(8)        -- length unit
);
CREATE TABLE shoelace_data (
	sl_name    char(10),      -- primary key
	sl_avail   integer,       -- available # of pairs
	sl_color   char(10),      -- shoelace color
	sl_len     float,         -- shoelace length
	sl_unit    char(8)        -- length unit
);
CREATE TABLE unit (
	un_name    char(8),       -- the primary key
	un_fact    float          -- factor to transform to cm
);
CREATE VIEW shoe AS
	SELECT sh.shoename,
		   sh.sh_avail,
		   sh.slcolor,
		   sh.slminlen,
		   sh.slminlen * un.un_fact AS slminlen_cm,
		   sh.slmaxlen,
		   sh.slmaxlen * un.un_fact AS slmaxlen_cm,
		   sh.slunit
	  FROM shoe_data sh, unit un
	 WHERE sh.slunit = un.un_name;
CREATE VIEW shoelace AS
	SELECT s.sl_name,
		   s.sl_avail,
		   s.sl_color,
		   s.sl_len,
		   s.sl_unit,
		   s.sl_len * u.un_fact AS sl_len_cm
	  FROM shoelace_data s, unit u
	 WHERE s.sl_unit = u.un_name;
CREATE VIEW shoe_ready AS
	SELECT rsh.shoename,
		   rsh.sh_avail,
		   rsl.sl_name,
		   rsl.sl_avail,
		   int4smaller(rsh.sh_avail, rsl.sl_avail) AS total_avail
	  FROM shoe rsh, shoelace rsl
	 WHERE rsl.sl_color = rsh.slcolor
	   AND rsl.sl_len_cm >= rsh.slminlen_cm
	   AND rsl.sl_len_cm <= rsh.slmaxlen_cm;
INSERT INTO unit VALUES ('cm', 1.0);
INSERT INTO unit VALUES ('m', 100.0);
INSERT INTO unit VALUES ('inch', 2.54);
INSERT INTO shoe_data VALUES ('sh1', 2, 'black', 70.0, 90.0, 'cm');
INSERT INTO shoe_data VALUES ('sh2', 0, 'black', 30.0, 40.0, 'inch');
INSERT INTO shoe_data VALUES ('sh3', 4, 'brown', 50.0, 65.0, 'cm');
INSERT INTO shoe_data VALUES ('sh4', 3, 'brown', 40.0, 50.0, 'inch');
INSERT INTO shoelace_data VALUES ('sl1', 5, 'black', 80.0, 'cm');
INSERT INTO shoelace_data VALUES ('sl2', 6, 'black', 100.0, 'cm');
INSERT INTO shoelace_data VALUES ('sl3', 0, 'black', 35.0 , 'inch');
INSERT INTO shoelace_data VALUES ('sl4', 8, 'black', 40.0 , 'inch');
INSERT INTO shoelace_data VALUES ('sl5', 4, 'brown', 1.0 , 'm');
INSERT INTO shoelace_data VALUES ('sl6', 0, 'brown', 0.9 , 'm');
INSERT INTO shoelace_data VALUES ('sl7', 7, 'brown', 60 , 'cm');
INSERT INTO shoelace_data VALUES ('sl8', 1, 'brown', 40 , 'inch');
-- SELECTs in doc
SELECT * FROM shoelace ORDER BY sl_name;
  sl_name   | sl_avail |  sl_color  | sl_len | sl_unit  | sl_len_cm 
------------+----------+------------+--------+----------+-----------
 sl1        |        5 | black      |     80 | cm       |        80
 sl2        |        6 | black      |    100 | cm       |       100
 sl3        |        0 | black      |     35 | inch     |      88.9
 sl4        |        8 | black      |     40 | inch     |     101.6
 sl5        |        4 | brown      |      1 | m        |       100
 sl6        |        0 | brown      |    0.9 | m        |        90
 sl7        |        7 | brown      |     60 | cm       |        60
 sl8        |        1 | brown      |     40 | inch     |     101.6
(8 rows)

SELECT * FROM shoe_ready WHERE total_avail >= 2 ORDER BY 1;
  shoename  | sh_avail |  sl_name   | sl_avail | total_avail 
------------+----------+------------+----------+-------------
 sh1        |        2 | sl1        |        5 |           2
 sh3        |        4 | sl7        |        7 |           4
(2 rows)

    CREATE TABLE shoelace_log (
        sl_name    char(10),      -- shoelace changed
        sl_avail   integer,       -- new available value
        log_who    name,          -- who did it
        log_when   timestamp      -- when
    );
-- Want "log_who" to be CURRENT_USER,
-- but that is non-portable for the regression test
-- - thomas 1999-02-21
    CREATE RULE log_shoelace AS ON UPDATE TO shoelace_data
        WHERE NEW.sl_avail != OLD.sl_avail
        DO INSERT INTO shoelace_log VALUES (
                                        NEW.sl_name,
                                        NEW.sl_avail,
                                        'Al Bundy',
                                        'epoch'
                                    );
UPDATE shoelace_data SET sl_avail = 6 WHERE  sl_name = 'sl7';
SELECT * FROM shoelace_log;
  sl_name   | sl_avail | log_who  |         log_when         
------------+----------+----------+--------------------------
 sl7        |        6 | Al Bundy | Thu Jan 01 00:00:00 1970
(1 row)

    CREATE RULE shoelace_ins AS ON INSERT TO shoelace
        DO INSTEAD
        INSERT INTO shoelace_data VALUES (
               NEW.sl_name,
               NEW.sl_avail,
               NEW.sl_color,
               NEW.sl_len,
               NEW.sl_unit);
    CREATE RULE shoelace_upd AS ON UPDATE TO shoelace
        DO INSTEAD
        UPDATE shoelace_data SET
               sl_name = NEW.sl_name,
               sl_avail = NEW.sl_avail,
               sl_color = NEW.sl_color,
               sl_len = NEW.sl_len,
               sl_unit = NEW.sl_unit
         WHERE sl_name = OLD.sl_name;
    CREATE RULE shoelace_del AS ON DELETE TO shoelace
        DO INSTEAD
        DELETE FROM shoelace_data
         WHERE sl_name = OLD.sl_name;
    CREATE TABLE shoelace_arrive (
        arr_name    char(10),
        arr_quant   integer
    );
    CREATE TABLE shoelace_ok (
        ok_name     char(10),
        ok_quant    integer
    );
    CREATE RULE shoelace_ok_ins AS ON INSERT TO shoelace_ok
        DO INSTEAD
        UPDATE shoelace SET
               sl_avail = sl_avail + NEW.ok_quant
         WHERE sl_name = NEW.ok_name;
INSERT INTO shoelace_arrive VALUES ('sl3', 10);
INSERT INTO shoelace_arrive VALUES ('sl6', 20);
INSERT INTO shoelace_arrive VALUES ('sl8', 20);
SELECT * FROM shoelace ORDER BY sl_name;
  sl_name   | sl_avail |  sl_color  | sl_len | sl_unit  | sl_len_cm