added timestamp code, support columns for group by and order by and tested load has-many eager code

backends/postgres/src/postgres_result_reader.cpp

@@ -2,6 +2,7 @@
 
 #include "matador/utils/convert.hpp"
 #include "matador/utils/value.hpp"
+#include "matador/utils/string.hpp"
 
 namespace matador::backends::postgres {
 postgres_result_reader::postgres_result_reader(PGresult *result)
@@ -104,18 +105,25 @@ void postgres_result_reader::read_value(const char * /*id*/, const size_t index,
 
 void postgres_result_reader::read_value(const char * /*id*/, const size_t index, utils::date_type_t &value) {
   if (const auto val = column(index); strlen(val) > 0) {
-    // value = time::parse(val, "%Y-%m-%d %T.%f");
+    if (const auto res = utils::to<utils::date_type_t>(std::string(val)); res.is_ok()) {
+      value = res.value();
+    }
   }
 }
 
 void postgres_result_reader::read_value(const char * /*id*/, const size_t index, utils::time_type_t &value) {
   if (const auto val = column(index); strlen(val) > 0) {
-    // value.set(val, matador::utils::date_format::ISO8601);
+    if (const auto res = utils::to<utils::time_type_t>(std::string(val)); res.is_ok()) {
+      value = res.value();
+    }
   }
 }
 
-void postgres_result_reader::read_value(const char * /*id*/, size_t index, utils::timestamp_type_t &value) {
+void postgres_result_reader::read_value(const char * /*id*/, const size_t index, utils::timestamp_type_t &value) {
   if (const auto val = column(index); strlen(val) > 0) {
+    if (const auto res = utils::to<utils::timestamp_type_t>(std::string(val)); res.is_ok()) {
+      value = res.value();
+    }
   }
 }
 

backends/postgres/test/CMakeLists.txt

@@ -31,6 +31,8 @@ set(TEST_SOURCES
   ../../../test/backends/StatementCacheTest.cpp
   ../../../test/backends/StatementTest.cpp
   ../../../test/backends/TypeTraitsTest.cpp
+  ../../../test/utils/record_printer.hpp
+  ../../../test/utils/record_printer.cpp
 )
 
 set(LIBRARY_TEST_TARGET PostgresTests)