.. _program_listing_file_include_util_db_relational_BackendConcept.hpp:

Program Listing for File BackendConcept.hpp
===========================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_util_db_relational_BackendConcept.hpp>` (``include\util\db\relational\BackendConcept.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   
   #include "util/common/Result.hpp"
   #include "util/db/relational/Types.hpp"
   
   #include <concepts>
   #include <string_view>
   
   namespace PDJE_UTIL::db::relational {
   
   template <class Backend>
   concept RelationalBackendConcept = requires(typename Backend::config_type cfg,
                                               Backend                      backend,
                                               std::string_view             sql,
                                               const Params                &params) {
       typename Backend::config_type;
   
       { Backend::create(cfg) } -> std::same_as<common::Result<void>>;
       { Backend::destroy(cfg) } -> std::same_as<common::Result<void>>;
   
       { backend.open(cfg) } -> std::same_as<common::Result<void>>;
       { backend.close() } -> std::same_as<common::Result<void>>;
   
       { backend.execute(sql, params) } -> std::same_as<common::Result<ExecResult>>;
       { backend.query(sql, params) } -> std::same_as<common::Result<QueryResult>>;
       { backend.begin_transaction() } -> std::same_as<common::Result<void>>;
       { backend.commit() } -> std::same_as<common::Result<void>>;
       { backend.rollback() } -> std::same_as<common::Result<void>>;
   };
   
   } // namespace PDJE_UTIL::db::relational