Merge pull request #28 from SBD1/#11-trigger/stored_procedure

#11 trigger/stored procedure

game/scripts/DDL/GeneralizacaoPersonagem.sql

@@ -12,4 +12,20 @@ CREATE OR REPLACE FUNCTION check_pc() RETURNS trigger AS -- Procedure para checa
 CREATE TRIGGER check_pc -- Trigger para adicionar NPC
 BEFORE UPDATE OR INSERT ON npc
 FOR EACH ROW
-EXECUTE PROCEDURE check_pc();
+EXECUTE PROCEDURE check_pc();
+
+CREATE OR REPLACE FUNCTION check_npc() RETURNS trigger AS -- Procedure para checar se o item adicionado ja pertence a npc
+    $check_npc$
+        BEGIN 
+            PERFORM * FROM npc WHERE Personagem = NEW.Personagem;
+            IF FOUND THEN
+                RAISE EXCEPTION 'O Id ja pertence a npc';
+            END IF;
+            RETURN NEW;
+        END
+    $check_npc$ LANGUAGE plpgsql;
+
+CREATE TRIGGER check_npc -- Trigger para adicionar PC
+BEFORE UPDATE OR INSERT ON pc
+FOR EACH ROW
+EXECUTE PROCEDURE check_npc();