added date_type_t, time_type_t and timestamp, ensure allocated postgres resources are released, split repository into basic_repository and repository.

backends/postgres/src/postgres_result_reader.cpp

@@ -153,6 +153,8 @@ void postgres_result_reader::read_value( const char* /*id*/, const size_t index,
   unsigned char* unescaped = PQunescapeBytea(data, &length);
 
   value.assign(unescaped, unescaped+length);
+
+  PQfreemem(unescaped);
 }
 
 template <typename Type>
@@ -168,6 +170,8 @@ void set_value<utils::blob>(const char* str, utils::value& value) {
   unsigned char* unescaped = PQunescapeBytea(reinterpret_cast<const unsigned char*>(str), &length);
 
   value = utils::blob(unescaped, unescaped+length);
+
+  PQfreemem(unescaped);
 }
 
 void postgres_result_reader::read_value(const char * /*id*/, const size_t index, utils::value &val, size_t) {