The attached adds GRANTs to PUBLIC for dblink functions, removes the

non-standard regression test, and adds standard installcheck regression test
support.

The test creates a second database (regression_slave) and drops it again, in
order to avoid the cheesy-ness of connecting back to the same database ;-)

Joe Conway

contrib/dblink/sql/dblink.sql

@@ -0,0 +1,149 @@
+--
+-- First, create a slave database and define the functions.
+-- Turn off echoing so that expected file does not depend on
+-- contents of dblink.sql.
+--
+CREATE DATABASE regression_slave;
+\connect regression_slave
+\set ECHO none
+\i dblink.sql
+\set ECHO all
+
+create table foo(f1 int, f2 text, f3 text[], primary key (f1,f2));
+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;
+
+-- list the primary key fields
+select * from dblink_get_pkey('foo');
+
+-- 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"}');
+
+-- 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"}');
+
+-- build a delete statement based on a local tuple,
+select dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
+
+--
+-- Connect back to the regression database and define the functions.
+-- Turn off echoing so that expected file does not depend on
+-- contents of dblink.sql.
+--
+\connect regression
+\set ECHO none
+\i dblink.sql
+\set ECHO all
+
+-- regular old dblink
+select * from dblink('dbname=regression_slave','select * from foo') as t(a int, b text, c text[]) where t.a > 7;
+
+-- should generate "no connection available" error
+select * from dblink('select * from foo') as t(a int, b text, c text[]) where t.a > 7;
+
+-- create a persistent connection
+select dblink_connect('dbname=regression_slave');
+
+-- use the persistent connection
+select * from dblink('select * from foo') as t(a int, b text, c text[]) where t.a > 7;
+
+-- open a cursor
+select dblink_open('rmt_foo_cursor','select * from foo');
+
+-- fetch some data
+select * from dblink_fetch('rmt_foo_cursor',4) as t(a int, b text, c text[]);
+select * from dblink_fetch('rmt_foo_cursor',4) as t(a int, b text, c text[]);
+
+-- this one only finds two rows left
+select * from dblink_fetch('rmt_foo_cursor',4) as t(a int, b text, c text[]);
+
+-- close the cursor
+select dblink_close('rmt_foo_cursor');
+
+-- 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[]);
+
+-- close the persistent connection
+select dblink_disconnect();
+
+-- should generate "no connection available" error
+select * from dblink('select * from foo') as t(a int, b text, c text[]) where t.a > 7;
+
+-- 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_slave','insert into foo values(10,''k'',''{"a10","b10","c10"}'')'),1,6);
+
+-- create a persistent connection
+select dblink_connect('dbname=regression_slave');
+
+-- 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);
+
+-- let's see it
+select * from dblink('select * from foo') as t(a int, b text, c text[]);
+
+-- change some data
+select dblink_exec('update foo set f3[2] = ''b99'' where f1 = 11');
+
+-- let's see it
+select * from dblink('select * from foo') as t(a int, b text, c text[]) where a = 11;
+
+-- delete some data
+select dblink_exec('delete from foo where f1 = 11');
+
+-- let's see it
+select * from dblink('select * from foo') as t(a int, b text, c text[]) where a = 11;
+
+-- close the persistent connection
+select dblink_disconnect();
+
+-- now wait for the connection to the slave to be cleared before
+-- we try to drop the database
+CREATE FUNCTION wait() RETURNS TEXT AS '
+DECLARE
+	rec           record;
+    cntr          int;
+BEGIN
+    cntr = 0;
+
+    select into rec d.datname
+    from pg_database d,
+        (select pg_stat_get_backend_dbid(pg_stat_get_backend_idset()) AS dbid) b
+    where d.oid = b.dbid and d.datname = ''regression_slave'';
+
+    WHILE FOUND LOOP
+        cntr = cntr + 1;
+
+        select into rec d.datname
+        from pg_database d,
+            (select pg_stat_get_backend_dbid(pg_stat_get_backend_idset()) AS dbid) b
+        where d.oid = b.dbid and d.datname = ''regression_slave'';
+
+        -- safety valve
+        if cntr > 1000 THEN
+            EXIT;
+        end if;
+	END LOOP;
+	RETURN ''OK'';
+END;
+' LANGUAGE 'plpgsql';
+SELECT wait();
+
+-- OK, safe to drop the slave
+DROP DATABASE regression_slave;