-- 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 ECHO none 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 -- show the currently executing query SELECT 'hello' AS hello, dblink_current_query() AS query; hello | query -------+----------------------------------------------------------- hello | SELECT 'hello' AS hello, dblink_current_query() AS query; (1 row) -- 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=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 "no connection available" error SELECT * FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[]) WHERE t.a > 7; ERROR: dblink: no connection available -- create a persistent connection SELECT dblink_connect('dbname=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 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) -- close the cursor SELECT dblink_close('rmt_foo_cursor'); dblink_close -------------- OK (1 row) -- should generate "cursor rmt_foo_cursor does not exist" error SELECT * FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]); ERROR: dblink_fetch: cursor rmt_foo_cursor does not exist -- close the persistent connection SELECT dblink_disconnect(); dblink_disconnect ------------------- OK (1 row) -- should generate "no connection available" error SELECT * FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[]) WHERE t.a > 7; ERROR: dblink: no connection 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=regression','SET autocommit TO ''on'';INSERT INTO foo VALUES(10,''k'',''{"a10","b10","c10"}'')'),1,6); substr -------- INSERT (1 row) -- create a persistent connection SELECT dblink_connect('dbname=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('SET autocommit TO ''on'';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) -- change some data SELECT dblink_exec('SET autocommit TO ''on'';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) -- delete some data SELECT dblink_exec('SET autocommit TO ''on'';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)