Added an optional DB connector file to standardize the connections from the app to PGO.

src/db_connector.erl

@@ -0,0 +1,23 @@
+%% Feel free to use, reuse and abuse the code in this file.
+%%
+%% The purpose of the DB Connector is to have a standard interface for the rest of the app to communicate with PGO.
+%% This will make it easy to reflect any changes in the return type of PGO (e.g. when it moved from returning tuples to maps)
+%% Or to replace another tool with PGO, or vice versa. 
+%% So the app calls functions defined in a "helper" file. 
+%% And the helper file communicates with PGO via the connector. So in case of any changes with PGO, only this connector file needs to be updated, and not every pgo:query call.
+
+%% @doc PGO connector
+
+-module(db_connector).
+-export([simple_query/1, extended_query/2]).
+
+simple_query(Query) -> 
+    #{command := Command, num_rows := NumRows, rows := Result} = 
+        pgo:query(Query, [], #{decode_opts => 
+        [return_rows_as_maps, column_name_as_atom]} ),
+    #{command => Command, num_rows => NumRows, result => Result}.
+
+extended_query(Query, ParamList) ->
+    #{command := Command, num_rows := NumRows, rows := Result} = 
+        pgo:query(Query, ParamList, #{decode_opts => [return_rows_as_maps, column_name_as_atom]}),
+    #{command => Command, num_rows => NumRows, result => Result}.