Initial commit

coordinates_class.py

@@ -0,0 +1,32 @@
+from sqlalchemy import func
+from sqlalchemy.types import UserDefinedType, Float
+
+class EasyGeometry(UserDefinedType):
+
+    def get_col_spec(self):
+        return "GEOMETRY"
+
+    def bind_expression(self, bindvalue):
+        return func.ST_GeomFromText(bindvalue, type_=self)
+
+    def column_expression(self, col):
+        return func.ST_AsText(col, type_=self)
+
+    def bind_processor(self, dialect):
+        def process(value):
+            if value is None:
+                return None
+            assert isinstance(value, tuple)
+            lat, lng = value
+            return "POINT(%s %s)" % (lng, lat)
+        return process
+
+    def result_processor(self, dialect, coltype):
+        def process(value):
+            if value is None:
+                return None
+            #m = re.match(r'^POINT\((\S+) (\S+)\)$', value)
+            #lng, lat = m.groups()
+            lng, lat = value[6:-1].split()  # 'POINT(135.00 35.00)' => ('135.00', '35.00')
+            return (float(lat), float(lng))
+        return process