sequence.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

---
--- test creation of SERIAL column
---
 
CREATE TABLE serialTest (f1 text, f2 serial);
NOTICE:  CREATE TABLE will create implicit sequence "serialtest_f2_seq" for serial column "serialtest.f2"
 
INSERT INTO serialTest VALUES ('foo');
INSERT INTO serialTest VALUES ('bar');
INSERT INTO serialTest VALUES ('force', 100);
INSERT INTO serialTest VALUES ('wrong', NULL);
ERROR:  null value in column "f2" violates not-null constraint
 
SELECT * FROM serialTest;
  f1   | f2  
-------+-----
 foo   |   1
 bar   |   2
 force | 100
(3 rows)

-- basic sequence operations using both text and oid references
CREATE SEQUENCE sequence_test;
 
SELECT nextval('sequence_test'::text);
 nextval 
---------
       1
(1 row)

SELECT nextval('sequence_test'::regclass);
 nextval 
---------
       2
(1 row)

SELECT currval('sequence_test'::text);
 currval 
---------
       2
(1 row)

SELECT currval('sequence_test'::regclass);
 currval 
---------
       2
(1 row)

SELECT setval('sequence_test'::text, 32);
 setval 
--------
     32
(1 row)

SELECT nextval('sequence_test'::regclass);
 nextval 
---------
      33
(1 row)

SELECT setval('sequence_test'::text, 99, false);
 setval 
--------
     99
(1 row)

SELECT nextval('sequence_test'::regclass);
 nextval 
---------
      99
(1 row)

SELECT setval('sequence_test'::regclass, 32);
 setval 
--------
     32
(1 row)

SELECT nextval('sequence_test'::text);
 nextval 
---------
      33
(1 row)

SELECT setval('sequence_test'::regclass, 99, false);
 setval 
--------
     99
(1 row)

SELECT nextval('sequence_test'::text);
 nextval 
---------
      99
(1 row)

DROP SEQUENCE sequence_test;
-- renaming sequences
CREATE SEQUENCE foo_seq;
ALTER TABLE foo_seq RENAME TO foo_seq_new;
SELECT * FROM foo_seq_new;
 sequence_name | last_value | increment_by |      max_value      | min_value | cache_value | log_cnt | is_cycled | is_called 
---------------+------------+--------------+---------------------+-----------+-------------+---------+-----------+-----------
 foo_seq       |          1 |            1 | 9223372036854775807 |         1 |           1 |       1 | f         | f
(1 row)

DROP SEQUENCE foo_seq_new;
-- renaming serial sequences
ALTER TABLE serialtest_f2_seq RENAME TO serialtest_f2_foo;
INSERT INTO serialTest VALUES ('more');
SELECT * FROM serialTest;
  f1   | f2  
-------+-----
 foo   |   1
 bar   |   2
 force | 100
 more  |   3
(4 rows)

--
-- Check dependencies of serial and ordinary sequences
--
CREATE TEMP SEQUENCE myseq2;
CREATE TEMP SEQUENCE myseq3;
CREATE TEMP TABLE t1 (
  f1 serial,
  f2 int DEFAULT nextval('myseq2'),
  f3 int DEFAULT nextval('myseq3'::text)
);
NOTICE:  CREATE TABLE will create implicit sequence "t1_f1_seq" for serial column "t1.f1"
-- Both drops should fail, but with different error messages:
DROP SEQUENCE t1_f1_seq;
ERROR:  cannot drop sequence t1_f1_seq because table t1 column f1 requires it
HINT:  You may drop table t1 column f1 instead.
DROP SEQUENCE myseq2;
NOTICE:  default for table t1 column f2 depends on sequence myseq2
ERROR:  cannot drop sequence myseq2 because other objects depend on it
HINT:  Use DROP ... CASCADE to drop the dependent objects too.
-- This however will work:
DROP SEQUENCE myseq3;
DROP TABLE t1;
-- Fails because no longer existent:
DROP SEQUENCE t1_f1_seq;
ERROR:  sequence "t1_f1_seq" does not exist
-- Now OK:
DROP SEQUENCE myseq2;
--
-- Alter sequence
--
CREATE SEQUENCE sequence_test2 START WITH 32;
SELECT nextval('sequence_test2');
 nextval 
---------
      32
(1 row)

ALTER SEQUENCE sequence_test2 RESTART WITH 16
	 INCREMENT BY 4 MAXVALUE 22 MINVALUE 5 CYCLE;
SELECT nextval('sequence_test2');
 nextval 
---------
      16
(1 row)

SELECT nextval('sequence_test2');
 nextval 
---------
      20
(1 row)

SELECT nextval('sequence_test2');
 nextval 
---------
       5
(1 row)

-- Test comments
COMMENT ON SEQUENCE asdf IS 'won''t work';
ERROR:  relation "asdf" does not exist
COMMENT ON SEQUENCE sequence_test2 IS 'will work';
COMMENT ON SEQUENCE sequence_test2 IS NULL;
-- Test lastval()
CREATE SEQUENCE seq;
SELECT nextval('seq');
 nextval 
---------
       1
(1 row)

SELECT lastval();
 lastval 
---------
       1
(1 row)

SELECT setval('seq', 99);
 setval 
--------
     99
(1 row)

SELECT lastval();
 lastval 
---------
      99
(1 row)

CREATE SEQUENCE seq2;
SELECT nextval('seq2');
 nextval 
---------
       1
(1 row)

SELECT lastval();
 lastval 
---------
       1
(1 row)

DROP SEQUENCE seq2;
-- should fail
SELECT lastval();
ERROR:  lastval is not yet defined in this session
CREATE USER seq_user;
BEGIN;
SET LOCAL SESSION AUTHORIZATION seq_user;
CREATE SEQUENCE seq3;
SELECT nextval('seq3');
 nextval 
---------
       1
(1 row)

REVOKE ALL ON seq3 FROM seq_user;
SELECT lastval();
ERROR:  permission denied for sequence seq3
ROLLBACK;
DROP USER seq_user;
DROP SEQUENCE seq;