session queries as statement progress

source/orm/sql/connection.cpp

@@ -28,20 +28,17 @@ public:
 };
 
 }
-connection::connection(connection_info info, const std::shared_ptr<abstract_sql_logger> &sql_logger)
-: connection_info_(std::move(info))
-, logger_(sql_logger)
+connection::connection(const connection_info& info, const std::shared_ptr<abstract_sql_logger> &sql_logger)
+: logger_(sql_logger)
 {
-  connection_.reset(backend_provider::instance().create_connection(connection_info_.type, connection_info_));
+  connection_.reset(backend_provider::instance().create_connection(info.type, info));
 }
 
 connection::connection(const std::string& dns, const std::shared_ptr<abstract_sql_logger> &sql_logger)
 : connection(connection_info::parse(dns), sql_logger)
 {}
 
-connection::connection(const connection &x)
-: connection_info_(x.connection_info_)
-{
+connection::connection(const connection &x) {
   if (x.connection_) {
     throw std::runtime_error("couldn't copy connection with valid connection impl");
   }
@@ -52,7 +49,6 @@ connection &connection::operator=(const connection &x) {
     return *this;
   }
 
-  connection_info_ = x.connection_info_;
   if (x.connection_) {
     throw std::runtime_error("couldn't copy connection with valid connection impl");
   }
@@ -60,13 +56,11 @@ connection &connection::operator=(const connection &x) {
 }
 
 connection::connection( connection&& x ) noexcept
-: connection_info_(std::move(x.connection_info_))
-, connection_(std::move(x.connection_))
+: connection_(std::move(x.connection_))
 , logger_(std::move(x.logger_))
 {}
 
 connection & connection::operator=(connection &&x) noexcept {
-  connection_info_ = std::move(x.connection_info_);
   connection_  = std::move(x.connection_);
   logger_ = std::move(x.logger_);
 
@@ -80,7 +74,8 @@ connection::~connection() {
   if (connection_->is_open()) {
     connection_->close();
   }
-  backend_provider::instance().destroy_connection(connection_info_.type, connection_.release());
+  connection_impl* impl = connection_.release();
+  backend_provider::instance().destroy_connection(impl->info().type, impl);
   connection_ = nullptr;
 }
 
@@ -108,11 +103,11 @@ utils::result<bool, utils::error> connection::is_open() const
 
 const connection_info &connection::info() const
 {
-  return connection_info_;
+  return connection_->info();
 }
 
 std::string connection::type() const {
-  return connection_info_.type;
+  return connection_->info().type;
 }
 
 utils::result<void, utils::error> connection::begin() const {