-- Adjust this setting to control where the objects get created.
SET search_path = public;
--
-- Define the functions and test data
-- therein.
--
-- Turn off echoing so that expected file does not depend on
-- contents of dblink.sql.
SET client_min_messages = warning;
\set ECHO none
RESET client_min_messages;
CREATE TABLE foo(f1 int, f2 text, f3 text[], primary key (f1,f2));
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "foo_pkey" for table "foo"
INSERT INTO foo VALUES (0,'a','{"a0","b0","c0"}');
INSERT INTO foo VALUES (1,'b','{"a1","b1","c1"}');
INSERT INTO foo VALUES (2,'c','{"a2","b2","c2"}');
INSERT INTO foo VALUES (3,'d','{"a3","b3","c3"}');
INSERT INTO foo VALUES (4,'e','{"a4","b4","c4"}');
INSERT INTO foo VALUES (5,'f','{"a5","b5","c5"}');
INSERT INTO foo VALUES (6,'g','{"a6","b6","c6"}');
INSERT INTO foo VALUES (7,'h','{"a7","b7","c7"}');
INSERT INTO foo VALUES (8,'i','{"a8","b8","c8"}');
INSERT INTO foo VALUES (9,'j','{"a9","b9","c9"}');
-- misc utilities
-- list the primary key fields
SELECT *
FROM dblink_get_pkey('foo');
 position | colname 
----------+---------
        1 | f1
        2 | f2
(2 rows)

-- build an insert statement based on a local tuple,
-- replacing the primary key values with new ones
SELECT dblink_build_sql_insert('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
                  dblink_build_sql_insert                  
-----------------------------------------------------------
 INSERT INTO foo(f1,f2,f3) VALUES('99','xyz','{a0,b0,c0}')
(1 row)

-- build an update statement based on a local tuple,
-- replacing the primary key values with new ones
SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
                                dblink_build_sql_update                                 
----------------------------------------------------------------------------------------
 UPDATE foo SET f1 = '99', f2 = 'xyz', f3 = '{a0,b0,c0}' WHERE f1 = '99' AND f2 = 'xyz'
(1 row)

-- build a delete statement based on a local tuple,
SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
           dblink_build_sql_delete           
---------------------------------------------
 DELETE FROM foo WHERE f1 = '0' AND f2 = 'a'
(1 row)

-- retest using a quoted and schema qualified table
CREATE SCHEMA "MySchema";
CREATE TABLE "MySchema"."Foo"(f1 int, f2 text, f3 text[], primary key (f1,f2));
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "Foo_pkey" for table "Foo"
INSERT INTO "MySchema"."Foo" VALUES (0,'a','{"a0","b0","c0"}');
-- list the primary key fields
SELECT *
FROM dblink_get_pkey('"MySchema"."Foo"');
 position | colname 
----------+---------
        1 | f1
        2 | f2
(2 rows)

-- build an insert statement based on a local tuple,
-- replacing the primary key values with new ones
SELECT dblink_build_sql_insert('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
                        dblink_build_sql_insert                         
------------------------------------------------------------------------
 INSERT INTO "MySchema"."Foo"(f1,f2,f3) VALUES('99','xyz','{a0,b0,c0}')
(1 row)

-- build an update statement based on a local tuple,
-- replacing the primary key values with new ones
SELECT dblink_build_sql_update('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
                                       dblink_build_sql_update                                       
-----------------------------------------------------------------------------------------------------
 UPDATE "MySchema"."Foo" SET f1 = '99', f2 = 'xyz', f3 = '{a0,b0,c0}' WHERE f1 = '99' AND f2 = 'xyz'
(1 row)

-- build a delete statement based on a local tuple,
SELECT dblink_build_sql_delete('"MySchema"."Foo"','1 2',2,'{"0", "a"}');
                 dblink_build_sql_delete                  
----------------------------------------------------------
 DELETE FROM "MySchema"."Foo" WHERE f1 = '0' AND f2 = 'a'
(1 row)

-- regular old dblink
SELECT *
FROM dblink('dbname=contrib_regression','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}
(2 rows)

-- should generate "connection not available" error
SELECT *
FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE t.a > 7;
ERROR:  connection not available
-- create a persistent connection
SELECT dblink_connect('dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

-- use the persistent connection
SELECT *
FROM dblink('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}
(2 rows)

-- open a cursor with bad SQL and fail_on_error set to false
SELECT dblink_open('rmt_foo_cursor','SELECT * FROM foobar',false);
NOTICE:  relation "foobar" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not open cursor.
 dblink_open 
-------------
 ERROR
(1 row)

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

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

-- close the cursor
SELECT dblink_close('rmt_foo_cursor',false);
 dblink_close 
--------------
 OK
(1 row)

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

-- fetch some data
SELECT *
FROM dblink_fetch('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('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 two rows left
SELECT *
FROM dblink_fetch('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}
(2 rows)

-- intentionally botch a fetch
SELECT *
FROM dblink_fetch('rmt_foobar_cursor',4,false) AS t(a int, b text, c text[]);
NOTICE:  cursor "rmt_foobar_cursor" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not fetch from cursor.
 a | b | c 
---+---+---
(0 rows)

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

-- close the wrong cursor
SELECT dblink_close('rmt_foobar_cursor',false);
NOTICE:  cursor "rmt_foobar_cursor" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not close cursor.
 dblink_close 
--------------
 ERROR
(1 row)

-- should generate 'cursor "rmt_foo_cursor" not found' error
SELECT *
FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
ERROR:  cursor "rmt_foo_cursor" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not fetch from cursor.
-- this time, 'cursor "rmt_foo_cursor" not found' as a notice
SELECT *
FROM dblink_fetch('rmt_foo_cursor',4,false) AS t(a int, b text, c text[]);
NOTICE:  cursor "rmt_foo_cursor" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not fetch from cursor.
 a | b | c 
---+---+---
(0 rows)

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

-- should generate "connection not available" error
SELECT *
FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
WHERE t.a > 7;
ERROR:  connection not available
-- put more data into our slave table, first using arbitrary connection syntax
-- but truncate the actual return value so we can use diff to check for success
SELECT substr(dblink_exec('dbname=contrib_regression','INSERT INTO foo VALUES(10,''k'',''{"a10","b10","c10"}'')'),1,6);
 substr 
--------
 INSERT
(1 row)

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

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

-- let's see it
SELECT *
FROM dblink('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)

-- bad remote select
SELECT *
FROM dblink('SELECT * FROM foobar',false) AS t(a int, b text, c text[]);
NOTICE:  relation "foobar" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not execute query.
 a | b | c 
---+---+---
(0 rows)

-- change some data
SELECT dblink_exec('UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
 dblink_exec 
-------------
 UPDATE 1
(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       
----+---+---------------
 11 | l | {a11,b99,c11}
(1 row)

-- botch a change to some other data
SELECT dblink_exec('UPDATE foobar SET f3[2] = ''b99'' WHERE f1 = 11',false);
NOTICE:  relation "foobar" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not execute command.
 dblink_exec 
-------------
 ERROR
(1 row)

-- delete some data
SELECT dblink_exec('DELETE FROM foo WHERE f1 = 11');
 dblink_exec 
-------------
 DELETE 1
(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:  relation "foobar" does not exist
CONTEXT:  Error occurred on dblink connection named "unnamed": could not execute query.
 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:  relation "foobar" does not exist
CONTEXT:  Error occurred on dblink connection named "myconn": could not open cursor.
 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:  DECLARE CURSOR can only be used in transaction blocks
CONTEXT:  Error occurred on dblink connection named "unnamed": could not execute command.
-- 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:  cursor "rmt_foobar_cursor" does not exist
CONTEXT:  Error occurred on dblink connection named "myconn": could not fetch from cursor.
 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:  cursor "rmt_foo_cursor" does not exist
CONTEXT:  Error occurred on dblink connection named "myconn": could not fetch from cursor.
-- 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
-- test asynchronous queries
SELECT dblink_connect('dtest1', 'dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

SELECT * from 
 dblink_send_query('dtest1', 'select * from foo where f1 < 3') as t1;
 t1 
----
  1
(1 row)

SELECT dblink_connect('dtest2', 'dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

SELECT * from 
 dblink_send_query('dtest2', 'select * from foo where f1 > 2 and f1 < 7') as t1;
 t1 
----
  1
(1 row)

SELECT dblink_connect('dtest3', 'dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

SELECT * from 
 dblink_send_query('dtest3', 'select * from foo where f1 > 6') as t1;
 t1 
----
  1
(1 row)

CREATE TEMPORARY TABLE result AS
(SELECT * from dblink_get_result('dtest1') as t1(f1 int, f2 text, f3 text[]))
UNION
(SELECT * from dblink_get_result('dtest2') as t2(f1 int, f2 text, f3 text[]))
UNION
(SELECT * from dblink_get_result('dtest3') as t3(f1 int, f2 text, f3 text[]))
ORDER by f1;
-- dblink_get_connections returns an array with elements in a machine-dependent
-- ordering, so we must resort to unnesting and sorting for a stable result
create function unnest(anyarray) returns setof anyelement
language sql strict immutable as $$
select $1[i] from generate_series(array_lower($1,1), array_upper($1,1)) as i
$$;
SELECT * FROM unnest(dblink_get_connections()) ORDER BY 1;
 unnest 
--------
 dtest1
 dtest2
 dtest3
(3 rows)

SELECT dblink_is_busy('dtest1');
 dblink_is_busy 
----------------
              0
(1 row)

SELECT dblink_disconnect('dtest1');
 dblink_disconnect 
-------------------
 OK
(1 row)

SELECT dblink_disconnect('dtest2');
 dblink_disconnect 
-------------------
 OK
(1 row)

SELECT dblink_disconnect('dtest3');
 dblink_disconnect 
-------------------
 OK
(1 row)

SELECT * from result;
 f1 | f2 |      f3       
----+----+---------------
  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 rows)

SELECT dblink_connect('dtest1', 'dbname=contrib_regression');
 dblink_connect 
----------------
 OK
(1 row)

SELECT * from 
 dblink_send_query('dtest1', 'select * from foo where f1 < 3') as t1;
 t1 
----
  1
(1 row)

SELECT dblink_cancel_query('dtest1');
 dblink_cancel_query 
---------------------
 OK
(1 row)

SELECT dblink_error_message('dtest1');
 dblink_error_message 
----------------------
 OK
(1 row)

SELECT dblink_disconnect('dtest1');
 dblink_disconnect 
-------------------
 OK
(1 row)

