entity query and record progress

backends/mysql/src/mysql_connection.cpp

@@ -181,13 +181,13 @@ std::unique_ptr<sql::query_result_impl> mysql_connection::fetch(const std::strin
 
   auto field_count = mysql_num_fields(result);
   auto fields = mysql_fetch_fields(result);
-  sql::record prototype;
+  std::vector<sql::column_definition> prototype;
   for (unsigned i = 0; i < field_count; ++i) {
     auto type = to_type(fields[i].type, fields[i].flags);
     auto options = to_constraints(fields[i].flags);
     auto null_opt = to_null_option(fields[i].flags);
 
-    prototype.append({fields[i].name, type, options, null_opt});
+    prototype.emplace_back(fields[i].name, type, options, null_opt);
   }
 
   return std::move(std::make_unique<sql::query_result_impl>(std::make_unique<mysql_result_reader>(result, field_count), std::move(prototype)));
@@ -216,7 +216,7 @@ size_t mysql_connection::execute(const std::string &stmt)
   return mysql_affected_rows(mysql_.get());
 }
 
-sql::record mysql_connection::describe(const std::string &table)
+std::vector<sql::column_definition> mysql_connection::describe(const std::string &table)
 {
   std::string stmt("SHOW COLUMNS FROM " + table);
 
@@ -230,7 +230,7 @@ sql::record mysql_connection::describe(const std::string &table)
   }
 
   mysql_result_reader reader(result, mysql_num_fields(result));
-  sql::record prototype;
+  std::vector<sql::column_definition> prototype;
   while (reader.fetch()) {
 
     char *end = nullptr;
@@ -242,7 +242,7 @@ sql::record mysql_connection::describe(const std::string &table)
     if (strtoul(reader.column(2), &end, 10) == 0) {
       null_opt = sql::null_option::NOT_NULL;
     }
-    prototype.append({name, typeinfo.type, {typeinfo.size}, null_opt, prototype.size()});
+    prototype.push_back({name, typeinfo.type, {typeinfo.size}, null_opt, prototype.size()});
   }
 
   return prototype;