dblink.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

(1 row)

-- let's see it
SELECT *
FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE a = 11;
 a | b | c 
---+---+---
(0 rows)

-- close the persistent connection
SELECT dblink_disconnect();
 dblink_disconnect 
-------------------
 OK
(1 row)

--
-- tests for the new named persistent connection syntax
--
-- should generate "missing "=" after "myconn" in connection info string" error
SELECT *
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE t.a > 7;
ERROR:  could not establish connection
DETAIL:  missing "=" after "myconn" in connection info string

-- create a named persistent connection
SELECT dblink_connect('myconn','dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

-- use the named persistent connection
SELECT *
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE t.a > 7;
 a  | b |       c       
----+---+---------------
  8 | i | {a8,b8,c8}
  9 | j | {a9,b9,c9}
 10 | k | {a10,b10,c10}
(3 rows)

-- use the named persistent connection, but get it wrong
SELECT *
FROM dblink('myconn','SELECT * FROM foobar',false) AS t(a int, b text, c text[])
WHERE t.a > 7;
NOTICE:  sql error
DETAIL:  ERROR:  relation "foobar" does not exist

 a | b | c 
---+---+---
(0 rows)

-- create a second named persistent connection
-- should error with "duplicate connection name"
SELECT dblink_connect('myconn','dbname=contrib_regression');
ERROR:  duplicate connection name
-- create a second named persistent connection with a new name
SELECT dblink_connect('myconn2','dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

-- use the second named persistent connection
SELECT *
FROM dblink('myconn2','SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE t.a > 7;
 a  | b |       c       
----+---+---------------
  8 | i | {a8,b8,c8}
  9 | j | {a9,b9,c9}
 10 | k | {a10,b10,c10}
(3 rows)

-- close the second named persistent connection
SELECT dblink_disconnect('myconn2');
 dblink_disconnect 
-------------------
 OK
(1 row)

-- open a cursor incorrectly
SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foobar',false);
NOTICE:  sql error
DETAIL:  ERROR:  relation "foobar" does not exist

 dblink_open 
-------------
 ERROR
(1 row)

-- reset remote transaction state
SELECT dblink_exec('myconn','ABORT');
 dblink_exec 
-------------
 ROLLBACK
(1 row)

-- test opening cursor in a transaction
SELECT dblink_exec('myconn','BEGIN');
 dblink_exec 
-------------
 BEGIN
(1 row)

-- an open transaction will prevent dblink_open() from opening its own
SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
 dblink_open 
-------------
 OK
(1 row)

-- this should not commit the transaction because the client opened it
SELECT dblink_close('myconn','rmt_foo_cursor');
 dblink_close 
--------------
 OK
(1 row)

-- this should succeed because we have an open transaction
SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
  dblink_exec   
----------------
 DECLARE CURSOR
(1 row)

-- commit remote transaction
SELECT dblink_exec('myconn','COMMIT');
 dblink_exec 
-------------
 COMMIT
(1 row)

-- test automatic transactions for multiple cursor opens
SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
 dblink_open 
-------------
 OK
(1 row)

-- the second cursor
SELECT dblink_open('myconn','rmt_foo_cursor2','SELECT * FROM foo');
 dblink_open 
-------------
 OK
(1 row)

-- this should not commit the transaction
SELECT dblink_close('myconn','rmt_foo_cursor2');
 dblink_close 
--------------
 OK
(1 row)

-- this should succeed because we have an open transaction
SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
  dblink_exec   
----------------
 DECLARE CURSOR
(1 row)

-- this should commit the transaction
SELECT dblink_close('myconn','rmt_foo_cursor');
 dblink_close 
--------------
 OK
(1 row)

-- this should fail because there is no open transaction
SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
ERROR:  sql error
DETAIL:  ERROR:  cursor "xact_test" already exists

-- reset remote transaction state
SELECT dblink_exec('myconn','ABORT');
 dblink_exec 
-------------
 ROLLBACK
(1 row)

-- open a cursor
SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
 dblink_open 
-------------
 OK
(1 row)

-- fetch some data
SELECT *
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
 a | b |     c      
---+---+------------
 0 | a | {a0,b0,c0}
 1 | b | {a1,b1,c1}
 2 | c | {a2,b2,c2}
 3 | d | {a3,b3,c3}
(4 rows)

SELECT *
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
 a | b |     c      
---+---+------------
 4 | e | {a4,b4,c4}
 5 | f | {a5,b5,c5}
 6 | g | {a6,b6,c6}
 7 | h | {a7,b7,c7}
(4 rows)

-- this one only finds three rows left
SELECT *
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
 a  | b |       c       
----+---+---------------
  8 | i | {a8,b8,c8}
  9 | j | {a9,b9,c9}
 10 | k | {a10,b10,c10}
(3 rows)

-- fetch some data incorrectly
SELECT *
FROM dblink_fetch('myconn','rmt_foobar_cursor',4,false) AS t(a int, b text, c text[]);
NOTICE:  sql error
DETAIL:  ERROR:  cursor "rmt_foobar_cursor" does not exist

 a | b | c 
---+---+---
(0 rows)

-- reset remote transaction state
SELECT dblink_exec('myconn','ABORT');
 dblink_exec 
-------------
 ROLLBACK
(1 row)

-- should generate 'cursor "rmt_foo_cursor" not found' error
SELECT *
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
ERROR:  sql error
DETAIL:  ERROR:  cursor "rmt_foo_cursor" does not exist

-- close the named persistent connection
SELECT dblink_disconnect('myconn');
 dblink_disconnect 
-------------------
 OK
(1 row)

-- should generate "missing "=" after "myconn" in connection info string" error
SELECT *
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE t.a > 7;
ERROR:  could not establish connection
DETAIL:  missing "=" after "myconn" in connection info string

-- create a named persistent connection
SELECT dblink_connect('myconn','dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

-- put more data into our slave table, using named persistent connection syntax
-- but truncate the actual return value so we can use diff to check for success
SELECT substr(dblink_exec('myconn','INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
 substr 
--------
 INSERT
(1 row)

-- let's see it
SELECT *
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
 a  | b |       c       
----+---+---------------
  0 | a | {a0,b0,c0}
  1 | b | {a1,b1,c1}
  2 | c | {a2,b2,c2}
  3 | d | {a3,b3,c3}
  4 | e | {a4,b4,c4}
  5 | f | {a5,b5,c5}
  6 | g | {a6,b6,c6}
  7 | h | {a7,b7,c7}
  8 | i | {a8,b8,c8}
  9 | j | {a9,b9,c9}
 10 | k | {a10,b10,c10}
 11 | l | {a11,b11,c11}
(12 rows)

-- change some data
SELECT dblink_exec('myconn','UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
 dblink_exec 
-------------
 UPDATE 1
(1 row)

-- let's see it
SELECT *
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE a = 11;
 a  | b |       c       
----+---+---------------
 11 | l | {a11,b99,c11}
(1 row)

-- delete some data
SELECT dblink_exec('myconn','DELETE FROM foo WHERE f1 = 11');
 dblink_exec 
-------------
 DELETE 1
(1 row)

-- let's see it
SELECT *
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE a = 11;
 a | b | c 
---+---+---
(0 rows)

-- close the named persistent connection
SELECT dblink_disconnect('myconn');
 dblink_disconnect 
-------------------
 OK
(1 row)

-- close the named persistent connection again
-- should get 'connection "myconn" not available' error
SELECT dblink_disconnect('myconn');
ERROR:  connection "myconn" not available