Database management changes

* Added in-base logging through a foreign data wrapper, which is only
possible using PostgreSQL 9.1
* Renamed database-related configuration files to indicate that they are
samples, and added the "real" names to the Git ignore list. Server
distribution modified accordingly.
* Removed PL/PgSQL registration (it was only necessary on 8.4)
* Added pgTAP SQL definitions and a script which will (hopefully) be
executed by the build system after the main Java build in order to
execute database unit tests. The script supports both admin- and user-
level testing. I also added a few tests to make sure the testing framework
actually runs them.
* Added documentation about the database definitions structure

legacyworlds-server-data/db-structure/database.sql

@@ -12,7 +12,9 @@
 -- Read configuration from file
 \set pgadmin `grep ^admin= db-config.txt | sed -e s/.*=//`
 \set dbname `grep ^db= db-config.txt | sed -e s/.*=//`
+\set dbname_string '''':dbname''''
 \set dbuser `grep ^user= db-config.txt | sed -e s/.*=//`
+\set dbuser_string '''':dbuser''''
 \set dbupass ''''`grep ^password= db-config.txt | sed -e s/.*=// -e "s/'/''/g"`''''
 
 
@@ -34,8 +36,21 @@ GRANT CONNECT ON DATABASE :dbname TO :dbuser;
 -- Connect to the LW database with the PostgreSQL admin user
 \c :dbname :pgadmin
 
--- Register PL/PgSQL
-CREATE TRUSTED PROCEDURAL LANGUAGE plpgsql;
+-- Register the dblink extension
+CREATE EXTENSION dblink;
+
+-- Create foreign data wrapper and server used to write logs from within
+-- transanctions
+CREATE FOREIGN DATA WRAPPER pgsql
+	VALIDATOR postgresql_fdw_validator;
+CREATE SERVER srv_logging
+	FOREIGN DATA WRAPPER pgsql
+	OPTIONS ( hostaddr '127.0.0.1' , dbname :dbname_string );
+CREATE USER MAPPING FOR :dbuser
+	SERVER srv_logging
+	OPTIONS ( user :dbuser_string , password :dbupass );
+GRANT USAGE ON FOREIGN SERVER srv_logging TO :dbuser;
+
 
 BEGIN;