refactoring: move Query/Function logic into Requester class

src/test/resources/fixtures/init.sql

@@ -24,3 +24,12 @@ INSERT INTO test (id, name) VALUES (1, 'plop') ON CONFLICT DO NOTHING;
 INSERT INTO test2 (id, title, test_id) VALUES (1, 'plop', 1) ON CONFLICT DO NOTHING;
 INSERT INTO test2 (id, title, test_id) VALUES (2, 'plip', 1) ON CONFLICT DO NOTHING;
 INSERT INTO test2 (id, title, test_id) VALUES (3, 'ttt', null) ON CONFLICT DO NOTHING;
+
+CREATE OR REPLACE FUNCTION test_function (name text default 'plop', IN hi text default 'hello', out result json)
+    LANGUAGE plpgsql
+AS
+$$
+BEGIN
+    result = json_build_object('id', 3, 'name', 'test');
+END;
+$$