provide function and view for displaying triples; + examples directory

.gitignore

@@ -0,0 +1 @@
+/data/

examples/cities/data/cities.csv

@@ -0,0 +1,35 @@
+rectype,ctype,regiokey,ckey,name,area,inhabitants,zipcode,long,lat
+40,42,08111,08111,"Stuttgart, Stadtkreis",,,,,
+50,50,081110000,08111,"Stuttgart, Landeshauptstadt",,,,,
+60,62,081110000000,08111000,"Stuttgart, Landeshauptstadt",207.33,634830,70173,9.177734,48.775817
+40,44,08115,08115,Böblingen,,,,,
+50,50,081150003,08115,"Böblingen, Stadt",,,,,
+60,67,081150003003,08115003,"Böblingen, Stadt",39.04,50155,71032,9.009663,48.685296
+50,50,081150052,08115,Weissach,,,,,
+60,64,081150052052,08115052,Weissach,22.19,7519,71287,8.927545,48.846812
+50,56,081155001,08115,GVV Aidlingen/Grafenau,,,,,
+60,64,081155001001,08115001,Aidlingen,26.56,9024,71134,8.896991,48.677969
+60,64,081155001054,08115054,Grafenau,13.04,6747,71120,8.91395,48.711098
+50,56,081155002,08115,GVV Gärtringen/Ehningen,,,,,
+60,64,081155002013,08115013,Ehningen,17.81,9193,71139,8.940525,48.65926
+60,64,081155002015,08115015,Gärtringen,20.21,12417,71116,8.901692,48.641924
+50,54,081155003,08115,VVG der Stadt Herrenberg,,,,,
+60,64,081155003010,08115010,Deckenpfronn,11.41,3329,75392,8.822512,48.65171
+60,67,081155003021,08115021,"Herrenberg, Stadt",65.7,31545,71083,8.867369,48.595705
+60,64,081155003037,08115037,Nufringen,10.04,5872,71154,8.888193,48.622489
+40,44,08116,08116,Esslingen,,,,,
+50,50,081160015,08116,Denkendorf,,,,,
+60,64,081160015015,08116015,Denkendorf,13.05,11240,73770,9.31755,48.694154
+50,50,081160019,08116,"Esslingen am Neckar, Stadt",,,,,
+60,67,081160019019,08116019,"Esslingen am Neckar, Stadt",46.43,93542,73728,9.309565,48.741347
+50,54,081165001,08116,VVG der Stadt Kirchheim unter Teck,,,,,
+60,64,081165001016,08116016,Dettingen unter Teck,15.13,6142,73265,9.45268,48.61725
+60,67,081165001033,08116033,"Kirchheim unter Teck, Stadt",40.47,40523,73230,9.453784,48.646093
+60,64,081165001048,08116048,Notzingen,7.7,3687,73274,9.462005,48.671109
+50,56,081165003,08116,GVV Neckartenzlingen,,,,,
+60,64,081165003005,08116005,Altdorf,3.24,1700,72655,9.271505,48.594688
+60,64,081165003006,08116006,Altenriet,3.35,1921,72657,9.221764,48.591482
+60,64,081165003008,08116008,Bempflingen,6.27,3485,72658,9.26546,48.573217
+60,64,081165003041,08116041,Neckartailfingen,8.23,3846,72666,9.262633,48.61255
+60,64,081165003042,08116042,Neckartenzlingen,9.03,6498,72654,9.233903,48.590722
+60,64,081165003063,08116063,Schlaitdorf,7.31,1931,72667,9.222445,48.604296

pgsql/fshow.sql

@@ -0,0 +1,16 @@
+
+create or replace function show(type smallint, id bigint) returns text as $$
+declare tname text := (select dtname from datatypes as dt where dt.id = type);
+begin
+    case tname
+        when 'node' then
+            return (
+                select ns.prefix || ':' || n.name 
+                    from nodes n
+                    join namespaces ns on ns.id = n.namespace
+                    where n.id = show.id
+            );
+        else return tname;
+    end case;
+end;
+$$ language plpgsql;

pgsql/init.sql

@@ -75,15 +75,17 @@ INSERT INTO nodes (namespace, name) VALUES
 -- type -> Property; Property, Class -> Class
 
 INSERT INTO triples (stype, svalue, predicate, otype, ovalue, creation) VALUES 
-    (2, 1, 2, 2, 2, 1),
-    (2, 2, 2, 2, 3, 1),
-    (2, 3, 2, 2, 3, 1);
+    (2, 1, 1, 2, 2, 1),
+    (2, 2, 1, 2, 3, 1),
+    (2, 3, 1, 2, 3, 1);
 
 -- indexes
 
 CREATE INDEX idx_iri ON namespaces USING btree (iri);
 CREATE INDEX idx_prefix ON namespaces USING btree (prefix);
 
+CREATE INDEX idx_dtname ON datatypes USING btree (dtname);
+
 CREATE INDEX idx_node_name ON nodes USING btree (namespace, name);
 
 CREATE INDEX fki_stype ON triples USING btree (stype);

pgsql/qtriples.sql

@@ -0,0 +1,4 @@
+
+select id, stext, ptext, otext, ts
+  from vtriples
+  

pgsql/vtriples.sql

@@ -0,0 +1,12 @@
+
+create or replace view vtriples as
+select triples.id,
+       stype, svalue, show(stype, svalue) as stext, 
+       predicate, show(dt.id, predicate) as ptext, 
+       otype, ovalue, show(otype, ovalue) as otext,
+       events.tstamp as ts
+  from triples, datatypes dt, events
+  where dtname = 'node'
+    and events.id = creation
+    and deletion is null
+;