CRUD - 创建 - C++ SDK

// Create an object using the `realm` namespace.
auto dog = realm::Dog{.name = "Rex", .age = 1};
std::cout << "dog: " << dog.name << "\n";
// Open the database with compile-time schema checking.
auto config = realm::db_config();
auto realm = realm::db(std::move(config));
// Persist your data in a write transaction
// Optionally return the managed object to work with it immediately
auto managedDog = realm.write([&] { return realm.add(std::move(dog)); });

auto config = realm::db_config();
auto realm = realm::db(std::move(config));
auto contactDetails = realm::ContactDetails{
    .emailAddress = "email@example.com", .phoneNumber = "123-456-7890"};
auto business = realm::Business();
business._id = realm::object_id::generate();
business.name = "MongoDB";
business.contactDetails = &contactDetails;
realm.write([&] { realm.add(std::move(business)); });

auto config = realm::db_config();
auto realmInstance = realm::db(std::move(config));
auto favoriteToy = realm::FavoriteToy{
    ._id = realm::uuid("68b696c9-320b-4402-a412-d9cee10fc6a5"),
    .name = "Wubba"};
auto dog = realm::Dog{
    ._id = realm::uuid("68b696d7-320b-4402-a412-d9cee10fc6a3"),
    .name = "Lita",
    .age = 10,
    .favoriteToy = &favoriteToy};
realmInstance.write([&] { realmInstance.add(std::move(dog)); });

auto config = realm::db_config();
auto realmInstance = realm::db(std::move(config));
auto employee1 = realm::Employee{
    ._id = 23456, .firstName = "Pam", .lastName = "Beesly"};
auto employee2 = realm::Employee{
    ._id = 34567, .firstName = "Jim", .lastName = "Halpert"};
auto company =
    realm::Company{._id = 45678, .name = "Dunder Mifflin"};
// Use the `push_back` member function available to the
// `ListObjectPersistable<T>` template to append `Employee` objects to
// the `Company` `employees` list property.
company.employees.push_back(&employee1);
company.employees.push_back(&employee2);
realmInstance.write([&] { realmInstance.add(std::move(company)); });

auto config = realm::db_config();
auto realm = realm::db(std::move(config));
auto dog = realm::Dog{.name = "Bowser"};
auto [jack, jill] = realm.write([&realm]() {
  auto person =
      realm::Person{.name = "Jack", .age = 27, .dog = nullptr};
  realm::Person person2;
  person2.name = "Jill";
  person2.age = 28;
  person2.dog = nullptr;
  return realm.insert(std::move(person), std::move(person2));
});
realm.write([&dog, jack = &jack]() { jack->dog = &dog; });
// After assigning `&dog` to jack's `dog` property,
// the backlink automatically updates to reflect
// the inverse relationship through the dog's `owners`
// property
CHECK(jack.dog->owners.size() == 1);
realm.write([&dog, jill = &jill]() { jill->dog = &dog; });
// After assigning the same `&dog` to jill's `dog`
// property, the backlink automatically updates
CHECK(jill.dog->owners.size() == 2);
CHECK(jack.dog->owners.size() == 2);
// Removing the relationship from the parent object
// automatically updates the inverse relationship
realm.write([jack = &jack]() { jack->dog = nullptr; });
CHECK(jack.dog == nullptr);
CHECK(jill.dog->owners.size() == 1);

auto config = realm::db_config();
auto realm = realm::db(std::move(config));
auto employee = realm::Employee{
    ._id = 8675309, .firstName = "Tommy", .lastName = "Tutone"};
employee.locationByDay = {
    {"Monday", realm::Employee::WorkLocation::HOME},
    {"Tuesday", realm::Employee::WorkLocation::OFFICE},
    {"Wednesday", realm::Employee::WorkLocation::HOME},
    {"Thursday", realm::Employee::WorkLocation::OFFICE}};
realm.write([&] {
  realm.add(std::move(employee));
  employee.locationByDay["Friday"] = realm::Employee::WorkLocation::HOME;
});

// Percent encode . or $ characters to use them in map keys
auto mapKey = "Monday.Morning";
auto encodedMapKey = "Monday%2EMorning";

auto realm = realm::db(std::move(config));
// Create an object that has a set property
auto docsRealmRepo =
    realm::Repository{.ownerAndName = "mongodb/docs-realm"};
// Add the object to the database and get the managed object
auto managedDocsRealm =
    realm.write([&]() { return realm.add(std::move(docsRealmRepo)); });
// Insert items into the set
auto openPullRequestNumbers = {3059, 3062, 3064};
realm.write([&] {
  for (auto number : openPullRequestNumbers) {
    // You can only mutate the set in a write transaction.
    // This means you can't set values at initialization,
    // but must do it during a write.
    managedDocsRealm.openPullRequestNumbers.insert(number);
  }
});

auto weatherSensorReading =
    realm::WeatherSensorReading{.deviceId = "WX1278UIT",
                                .temperatureInFahrenheit = 64.7,
                                .windSpeedInMph = 7};
realm.write([&] { realm.add(std::move(weatherSensorReading)); });