mirror of
https://github.com/postgres/postgres.git
synced 2025-11-03 09:13:20 +03:00
f4095b4c4b
Adds the ability to retrieve async notifications using dblink, via the addition of the function dblink_get_notify(). Original patch by Marcus Kempe, suggestions by Tom Lane and Alvaro Herrera, patch review and adjustments by Joe Conway.
409 lines
13 KiB
PL/PgSQL
409 lines
13 KiB
PL/PgSQL
-- Adjust this setting to control where the objects get created.
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SET search_path = public;
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--
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-- Define the functions and test data
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-- therein.
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--
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-- Turn off echoing so that expected file does not depend on
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-- contents of dblink.sql.
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SET client_min_messages = warning;
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\set ECHO none
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\i dblink.sql
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\set ECHO all
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RESET client_min_messages;
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CREATE TABLE foo(f1 int, f2 text, f3 text[], primary key (f1,f2));
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INSERT INTO foo VALUES (0,'a','{"a0","b0","c0"}');
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INSERT INTO foo VALUES (1,'b','{"a1","b1","c1"}');
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INSERT INTO foo VALUES (2,'c','{"a2","b2","c2"}');
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INSERT INTO foo VALUES (3,'d','{"a3","b3","c3"}');
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INSERT INTO foo VALUES (4,'e','{"a4","b4","c4"}');
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INSERT INTO foo VALUES (5,'f','{"a5","b5","c5"}');
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INSERT INTO foo VALUES (6,'g','{"a6","b6","c6"}');
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INSERT INTO foo VALUES (7,'h','{"a7","b7","c7"}');
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INSERT INTO foo VALUES (8,'i','{"a8","b8","c8"}');
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INSERT INTO foo VALUES (9,'j','{"a9","b9","c9"}');
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-- misc utilities
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-- list the primary key fields
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SELECT *
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FROM dblink_get_pkey('foo');
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-- build an insert statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_insert('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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-- build an update statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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-- build a delete statement based on a local tuple,
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SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
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-- retest using a quoted and schema qualified table
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CREATE SCHEMA "MySchema";
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CREATE TABLE "MySchema"."Foo"(f1 int, f2 text, f3 text[], primary key (f1,f2));
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INSERT INTO "MySchema"."Foo" VALUES (0,'a','{"a0","b0","c0"}');
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-- list the primary key fields
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SELECT *
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FROM dblink_get_pkey('"MySchema"."Foo"');
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-- build an insert statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_insert('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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-- build an update statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_update('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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-- build a delete statement based on a local tuple,
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SELECT dblink_build_sql_delete('"MySchema"."Foo"','1 2',2,'{"0", "a"}');
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-- regular old dblink
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SELECT *
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FROM dblink('dbname=contrib_regression','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- should generate "connection not available" error
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- create a persistent connection
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SELECT dblink_connect('dbname=contrib_regression');
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-- use the persistent connection
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- open a cursor with bad SQL and fail_on_error set to false
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SELECT dblink_open('rmt_foo_cursor','SELECT * FROM foobar',false);
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-- reset remote transaction state
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SELECT dblink_exec('ABORT');
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-- open a cursor
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SELECT dblink_open('rmt_foo_cursor','SELECT * FROM foo');
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-- close the cursor
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SELECT dblink_close('rmt_foo_cursor',false);
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-- open the cursor again
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SELECT dblink_open('rmt_foo_cursor','SELECT * FROM foo');
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-- fetch some data
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SELECT *
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FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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SELECT *
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FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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-- this one only finds two rows left
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SELECT *
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FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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-- intentionally botch a fetch
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SELECT *
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FROM dblink_fetch('rmt_foobar_cursor',4,false) AS t(a int, b text, c text[]);
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-- reset remote transaction state
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SELECT dblink_exec('ABORT');
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-- close the wrong cursor
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SELECT dblink_close('rmt_foobar_cursor',false);
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-- should generate 'cursor "rmt_foo_cursor" not found' error
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SELECT *
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FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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-- this time, 'cursor "rmt_foo_cursor" not found' as a notice
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SELECT *
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FROM dblink_fetch('rmt_foo_cursor',4,false) AS t(a int, b text, c text[]);
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-- close the persistent connection
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SELECT dblink_disconnect();
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-- should generate "connection not available" error
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- put more data into our slave table, first using arbitrary connection syntax
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-- but truncate the actual return value so we can use diff to check for success
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SELECT substr(dblink_exec('dbname=contrib_regression','INSERT INTO foo VALUES(10,''k'',''{"a10","b10","c10"}'')'),1,6);
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-- create a persistent connection
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SELECT dblink_connect('dbname=contrib_regression');
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-- put more data into our slave table, using persistent connection syntax
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-- but truncate the actual return value so we can use diff to check for success
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SELECT substr(dblink_exec('INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
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-- let's see it
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[]);
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-- bad remote select
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SELECT *
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FROM dblink('SELECT * FROM foobar',false) AS t(a int, b text, c text[]);
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-- change some data
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SELECT dblink_exec('UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
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-- let's see it
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE a = 11;
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-- botch a change to some other data
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SELECT dblink_exec('UPDATE foobar SET f3[2] = ''b99'' WHERE f1 = 11',false);
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-- delete some data
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SELECT dblink_exec('DELETE FROM foo WHERE f1 = 11');
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-- let's see it
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE a = 11;
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-- close the persistent connection
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SELECT dblink_disconnect();
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--
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-- tests for the new named persistent connection syntax
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--
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-- should generate "missing "=" after "myconn" in connection info string" error
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- create a named persistent connection
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SELECT dblink_connect('myconn','dbname=contrib_regression');
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-- use the named persistent connection
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- use the named persistent connection, but get it wrong
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SELECT *
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FROM dblink('myconn','SELECT * FROM foobar',false) AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- create a second named persistent connection
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-- should error with "duplicate connection name"
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SELECT dblink_connect('myconn','dbname=contrib_regression');
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-- create a second named persistent connection with a new name
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SELECT dblink_connect('myconn2','dbname=contrib_regression');
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-- use the second named persistent connection
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SELECT *
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FROM dblink('myconn2','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- close the second named persistent connection
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SELECT dblink_disconnect('myconn2');
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-- open a cursor incorrectly
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SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foobar',false);
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-- reset remote transaction state
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SELECT dblink_exec('myconn','ABORT');
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-- test opening cursor in a transaction
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SELECT dblink_exec('myconn','BEGIN');
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-- an open transaction will prevent dblink_open() from opening its own
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SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
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-- this should not commit the transaction because the client opened it
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SELECT dblink_close('myconn','rmt_foo_cursor');
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-- this should succeed because we have an open transaction
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SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
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-- commit remote transaction
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SELECT dblink_exec('myconn','COMMIT');
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-- test automatic transactions for multiple cursor opens
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SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
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-- the second cursor
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SELECT dblink_open('myconn','rmt_foo_cursor2','SELECT * FROM foo');
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-- this should not commit the transaction
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SELECT dblink_close('myconn','rmt_foo_cursor2');
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-- this should succeed because we have an open transaction
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SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
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-- this should commit the transaction
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SELECT dblink_close('myconn','rmt_foo_cursor');
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-- this should fail because there is no open transaction
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SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
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-- reset remote transaction state
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SELECT dblink_exec('myconn','ABORT');
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-- open a cursor
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SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
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-- fetch some data
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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-- this one only finds three rows left
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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-- fetch some data incorrectly
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SELECT *
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FROM dblink_fetch('myconn','rmt_foobar_cursor',4,false) AS t(a int, b text, c text[]);
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-- reset remote transaction state
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SELECT dblink_exec('myconn','ABORT');
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-- should generate 'cursor "rmt_foo_cursor" not found' error
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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-- close the named persistent connection
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SELECT dblink_disconnect('myconn');
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-- should generate "missing "=" after "myconn" in connection info string" error
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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-- create a named persistent connection
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SELECT dblink_connect('myconn','dbname=contrib_regression');
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-- put more data into our slave table, using named persistent connection syntax
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-- but truncate the actual return value so we can use diff to check for success
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SELECT substr(dblink_exec('myconn','INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
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-- let's see it
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
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-- change some data
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SELECT dblink_exec('myconn','UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
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-- let's see it
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE a = 11;
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-- delete some data
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SELECT dblink_exec('myconn','DELETE FROM foo WHERE f1 = 11');
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-- let's see it
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE a = 11;
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-- close the named persistent connection
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SELECT dblink_disconnect('myconn');
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-- close the named persistent connection again
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-- should get 'connection "myconn" not available' error
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SELECT dblink_disconnect('myconn');
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-- test asynchronous queries
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SELECT dblink_connect('dtest1', 'dbname=contrib_regression');
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SELECT * from
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dblink_send_query('dtest1', 'select * from foo where f1 < 3') as t1;
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SELECT dblink_connect('dtest2', 'dbname=contrib_regression');
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SELECT * from
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dblink_send_query('dtest2', 'select * from foo where f1 > 2 and f1 < 7') as t1;
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SELECT dblink_connect('dtest3', 'dbname=contrib_regression');
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SELECT * from
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dblink_send_query('dtest3', 'select * from foo where f1 > 6') as t1;
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CREATE TEMPORARY TABLE result AS
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(SELECT * from dblink_get_result('dtest1') as t1(f1 int, f2 text, f3 text[]))
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UNION
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(SELECT * from dblink_get_result('dtest2') as t2(f1 int, f2 text, f3 text[]))
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UNION
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(SELECT * from dblink_get_result('dtest3') as t3(f1 int, f2 text, f3 text[]))
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ORDER by f1;
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-- dblink_get_connections returns an array with elements in a machine-dependent
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-- ordering, so we must resort to unnesting and sorting for a stable result
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create function unnest(anyarray) returns setof anyelement
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language sql strict immutable as $$
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select $1[i] from generate_series(array_lower($1,1), array_upper($1,1)) as i
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$$;
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SELECT * FROM unnest(dblink_get_connections()) ORDER BY 1;
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SELECT dblink_is_busy('dtest1');
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SELECT dblink_disconnect('dtest1');
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SELECT dblink_disconnect('dtest2');
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SELECT dblink_disconnect('dtest3');
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SELECT * from result;
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SELECT dblink_connect('dtest1', 'dbname=contrib_regression');
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SELECT * from
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dblink_send_query('dtest1', 'select * from foo where f1 < 3') as t1;
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SELECT dblink_cancel_query('dtest1');
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SELECT dblink_error_message('dtest1');
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SELECT dblink_disconnect('dtest1');
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-- test foreign data wrapper functionality
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CREATE USER dblink_regression_test;
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CREATE FOREIGN DATA WRAPPER postgresql;
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CREATE SERVER fdtest FOREIGN DATA WRAPPER postgresql OPTIONS (dbname 'contrib_regression');
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CREATE USER MAPPING FOR public SERVER fdtest;
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GRANT USAGE ON FOREIGN SERVER fdtest TO dblink_regression_test;
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GRANT EXECUTE ON FUNCTION dblink_connect_u(text, text) TO dblink_regression_test;
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\set ORIGINAL_USER :USER
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\c - dblink_regression_test
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-- should fail
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SELECT dblink_connect('myconn', 'fdtest');
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-- should succeed
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SELECT dblink_connect_u('myconn', 'fdtest');
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SELECT * FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
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\c - :ORIGINAL_USER
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REVOKE USAGE ON FOREIGN SERVER fdtest FROM dblink_regression_test;
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REVOKE EXECUTE ON FUNCTION dblink_connect_u(text, text) FROM dblink_regression_test;
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DROP USER dblink_regression_test;
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DROP USER MAPPING FOR public SERVER fdtest;
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DROP SERVER fdtest;
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DROP FOREIGN DATA WRAPPER postgresql;
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-- test asynchronous notifications
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SELECT dblink_connect('dbname=contrib_regression');
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--should return listen
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SELECT dblink_exec('LISTEN regression');
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--should return listen
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SELECT dblink_exec('LISTEN foobar');
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SELECT dblink_exec('NOTIFY regression');
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SELECT dblink_exec('NOTIFY foobar');
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SELECT notify_name, be_pid = (select t.be_pid from dblink('select pg_backend_pid()') as t(be_pid int)) AS is_self_notify, extra from dblink_get_notify();
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SELECT * from dblink_get_notify();
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SELECT dblink_disconnect();
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