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query select changes

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This commit is contained in:
Sascha Kühl
2024-03-26 16:05:04 +01:00
parent b15b8da31f
commit 4a04a678f9
9 changed files with 193 additions and 32 deletions
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include/matador/sql/query_intermediates.hpp
+21 -5
View File
@@ -61,13 +61,29 @@ public:
{
return query_result<Type>(fetch());
}
query_result<record> fetch_all();
record fetch_one();
template<typename Type>
Type fetch_value()
template < class Type >
std::optional<Type> fetch_one()
{
return fetch_one().at(0).as<Type>().value();
auto result = query_result<Type>(fetch());
auto first = result.begin();
if (first == result.end()) {
return std::nullopt;
}
return *first.get();
}
std::optional<record> fetch_one();
template<typename Type>
std::optional<Type> fetch_value()
{
const auto result = fetch_one();
if (result.has_value()) {
return result.value().at(0).as<Type>().value();
}
return std::nullopt;
}
statement prepare();
include/matador/sql/query_result_impl.hpp
+12 -5
View File
@@ -73,23 +73,30 @@ public:
void on_attribute(const char *id, char *value, const utils::field_attributes &attr = utils::null_attributes);
void on_attribute(const char *id, std::string &value, const utils::field_attributes &attr = utils::null_attributes);
void on_attribute(const char *id, any_type &value, data_type_t type, const utils::field_attributes &attr = utils::null_attributes);
// void on_attribute(const char *id, any_type &value, data_type_t type, const utils::field_attributes &attr = utils::null_attributes);
template < class Pointer >
void on_belongs_to(const char * /*id*/, Pointer &x, const utils::foreign_attributes &/*attr*/)
void on_belongs_to(const char * /*id*/, Pointer &x, const utils::foreign_attributes &attr)
{
if (!x.get()) {
x.reset(new typename Pointer::value_type);
}
pk_reader_.read(*x, column_index_++);
if (attr.fetch() == utils::fetch_type::LAZY) {
pk_reader_.read(*x, column_index_++);
} else {
utils::access::process(*this, *x);
}
}
template < class Pointer >
void on_has_one(const char * /*id*/, Pointer &x, const utils::foreign_attributes &/*attr*/)
void on_has_one(const char * /*id*/, Pointer &x, const utils::foreign_attributes &attr)
{
if (!x.get()) {
x.reset(new typename Pointer::value_type);
}
pk_reader_.read(*x, column_index_++);
if (attr.fetch() == utils::fetch_type::LAZY) {
pk_reader_.read(*x, column_index_++);
} else {
utils::access::process(*this, *x);
}
}
template<class ContainerType>