query/include/matador/sql/generator.hpp

112 lines
3.4 KiB
C++

#ifndef MATADOR_GENERATOR_HPP
#define MATADOR_GENERATOR_HPP
#include <matador/object/repository.hpp>
#include <matador/utils/placeholder.hpp>
#include <vector>
namespace matador::sql::generator {
template < class Type >
static std::vector<utils::placeholder> placeholder(const object::repository &repo);
template < class Type >
static std::vector<utils::placeholder> columns(const object::repository &repo);
template < class Type >
static std::vector<utils::placeholder> key_values(const object::repository &repo);
class placeholder_generator {
public:
template < class Type >
static std::vector<utils::placeholder> generate(const object::repository &repo, const bool force_lazy = false) {
const auto info = repo.info<Type>();
if (!info) {
return {};
}
std::vector<utils::placeholder> columns;
placeholder_generator gen(columns, repo, info.value().get().name(), force_lazy);
Type obj;
access::process(gen, obj);
return columns;
}
template < class Type >
static std::vector<utils::placeholder> generate_has_many_to_many(const object::repository &scm, const bool force_lazy = false) {
const auto info = scm.info<Type>();
if (!info) {
return {};
}
std::vector<utils::placeholder> columns;
placeholder_generator gen(columns, scm, info.value().get().name(), force_lazy);
Type obj;
access::process(gen, obj);
return columns;
}
template < class V >
void on_primary_key(const char *id, V &, const utils::primary_key_attribute& /*attr*/ = utils::default_pk_attributes) {
if (has_many_to_many_) {
return;
}
push(id);
}
void on_revision(const char *id, uint64_t &/*rev*/);
template<typename Type>
void on_attribute(const char *id, Type &, const utils::field_attributes &/*attr*/ = utils::null_attributes) {
if (has_many_to_many_) {
return;
}
push(id);
}
template<class Pointer>
void on_belongs_to(const char *id, Pointer &x, const utils::foreign_attributes &attr) {
on_foreign_key(id, x, attr);
}
template<class Pointer>
void on_has_one(const char *id, Pointer &x, const utils::foreign_attributes &attr) {
on_foreign_key(id, x, attr);
}
template<class ContainerType>
void on_has_many(const char * /*id*/, ContainerType &, const char *, const utils::foreign_attributes &attr) {
if (has_many_to_many_) {
return;
}
if (attr.fetch() == utils::fetch_type::LAZY || force_lazy_) {
return;
}
const auto info = table_schema_.info<typename ContainerType::value_type::value_type>();
if (!info) {
return;
}
if (seen_tables.count(info->get().name()) == 0) {
auto it = seen_tables.insert(info->get().name()).first;
table_name_stack_.push(info.value().get().name());
typename ContainerType::value_type::value_type obj;
access::process(*this, obj);
table_name_stack_.pop();
seen_tables.erase(it);
}
}
template<class ContainerType>
void on_has_many_to_many(const char * /*id*/, ContainerType & /*cont*/, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &/*attr*/) {
if (!has_many_to_many_) {
return;
}
push(join_column);
push(inverse_join_column);
}
template<class ContainerType>
static void on_has_many_to_many(const char * /*id*/, ContainerType & /*cont*/, const utils::foreign_attributes &/*attr*/) {}
private:
};
}
#endif //MATADOR_GENERATOR_HPP