feat: add sql functions

PostgreSQL/Makefile

@@ -6,7 +6,8 @@ all: build
 build: \
 	$(DIR_BUILD)/00_drop.sql \
 	$(DIR_BUILD)/01_create.sql \
-	$(DIR_BUILD)/02_insert.sql
+	$(DIR_BUILD)/02_insert.sql \
+	$(DIR_BUILD)/05_functions.sql
 	# $(DIR_BUILD)/03_select.sql \
 	# $(DIR_BUILD)/04_update.sql
 
@@ -34,6 +35,10 @@ $(DIR_BUILD)/04_update.sql: $(DIR_SRC)/update.sql
 	mkdir -p $(dir $@)
 	cp $< $@
 
+$(DIR_BUILD)/05_functions.sql: $(DIR_SRC)/functions.sql
+	mkdir -p $(dir $@)
+	cp $< $@
+
 clean:
 	rm -f $(DIR_BUILD)/* .data/*.data
 

PostgreSQL/src/functions.sql

@@ -0,0 +1,33 @@
+
+DROP FUNCTION pieces_membre(integer);
+CREATE OR REPLACE FUNCTION pieces_membre(int) RETURNS TABLE(id_piece int, quantite_piece int)
+AS 
+$$ 
+SELECT id_piece, quantite_contenir * quantite_enregistrer as quantite_pieces_possedees
+FROM enregistrer
+NATURAL JOIN boites
+NATURAL JOIN contenir
+WHERE id_membre=$1
+UNION
+(SELECT id_piece, quantite_acheter as quantite_pieces_possedees
+  FROM acheter WHERE id_membre=$1);
+$$
+LANGUAGE SQL;
+;
+
+
+-- Liste des modèles faisables à partir d'un membre
+CREATE OR REPLACE FUNCTION modeles_faisables_membre(int) RETURNS TABLE(id_modele int) AS 
+$$
+SELECT id_modele
+FROM modeles
+WHERE id_modele not IN
+(
+  SELECT id_modele FROM (SELECT * FROM pieces_membre($1)) as pieces_possedees
+  RIGHT OUTER JOIN (SELECT id_piece as id_necessaire, quantite_necessiter, id_modele
+                    FROM necessiter) as pieces_modeles
+  ON pieces_possedees.id_piece = id_necessaire
+  WHERE quantite_necessiter > quantite_piece OR quantite_piece IS NULL
+)
+$$
+LANGUAGE SQL;