Native gui: implement data lists for all modules

yms/model/vessel.py

@@ -8,8 +8,28 @@ class Vessel(DbRecord):
     pk_field = "vid"
     fields = ('vid', 'vtype', 'vesselname', 'model', 'shipyard', 'loa', 'lwl',
         'beam', 'draught', 'draught_min', 'displacement', 'ballast',
-        'beltpos_aft', 'beltpos_bow', 'shapefile', 'sid_default', 'remarks')
+        'beltpos_aft', 'beltpos_bow', 'shapefile', 'sid_default', 'year_built',
+        'remarks')
 
     def __init__(self, db, vid=None):
         super().__init__(db, vid)
         self.title = _("Vessel({})")
+
+    def create(self):
+        sql = (
+            "SELECT MIN(v1.vid+1) AS newid "
+            "FROM vessel AS v1 LEFT JOIN vessel AS v2 ON v2.vid=v1.vid+1 "
+            "WHERE v1.vid>=0 AND v2.vid IS NULL"
+            )
+        self.dcur.execute(sql)
+        row = self.cur.fetchone()
+        if row is None:
+            # vessel table empty: create first vessel
+            self.pk_value = 1
+        else:
+            # create additional vessel
+            self.pk_value = row['newid']
+        self.vesselname = f"Vessel #{self.pk_value}"
+        self.vtype = 1 # monohull
+        self._insert()
+        self.conn.commit()