private void basicCRUD(Realm realm)
{
showStatus("Perform basic Create/Read/Update/Delete (CRUD) operations...");
// All writes must be wrapped in a transaction to facilitate safe multi threading
realm.beginTransaction();
// Add a person
Person person = realm.createObject(typeof(Person));
person.Id = 1;
person.Name = "Young Person";
person.Age = 14;
// When the transaction is committed, all changes a synced to disk.
realm.commitTransaction();
// Find the first person (no query conditions) and read a field
person = realm.@where(typeof(Person)).findFirst();
showStatus(person.Name + ":" + person.Age);
// Update person in a transaction
realm.beginTransaction();
person.Name = "Senior Person";
person.Age = 99;
showStatus(person.Name + " got older: " + person.Age);
realm.commitTransaction();
// Delete all persons
realm.beginTransaction();
realm.allObjects(typeof(Person)).clear();
realm.commitTransaction();
}
private string complexReadWrite()
{
string status = "\nPerforming complex Read/Write operation...";
// Open the default realm. All threads must use it's own reference to the realm.
// Those can not be transferred across threads.
Realm realm = Realm.getInstance(this);
// Add ten persons in one transaction
realm.beginTransaction();
Dog fido = realm.createObject(typeof(Dog));
fido.Name = "fido";
for (int i = 0; i < 10; i++)
{
Person person = realm.createObject(typeof(Person));
person.Id = i;
person.Name = "Person no. " + i;
person.Age = i;
person.Dog = fido;
// The field tempReference is annotated with @Ignore.
// This means setTempReference sets the Person tempReference
// field directly. The tempReference is NOT saved as part of
// the RealmObject:
person.TempReference = 42;
for (int j = 0; j < i; j++)
{
Cat cat = realm.createObject(typeof(Cat));
cat.Name = "Cat_" + j;
person.Cats.add(cat);
}
}
realm.commitTransaction();
// Implicit read transactions allow you to access your objects
status += "\nNumber of persons: " + realm.allObjects(typeof(Person)).size();
// Iterate over all objects
foreach (Person pers in realm.allObjects(typeof(Person)))
{
string dogName;
if (pers.Dog == null)
{
dogName = "None";
}
else
{
dogName = pers.Dog.Name;
}
status += "\n" + pers.Name + ":" + pers.Age + " : " + dogName + " : " + pers.Cats.size();
// The field tempReference is annotated with @Ignore
// Though we initially set its value to 42, it has
// not been saved as part of the Person RealmObject:
assert(pers.TempReference == 0);
}
// Sorting
RealmResults <Person> sortedPersons = realm.allObjects(typeof(Person));
sortedPersons.sort("age", false);
assert(realm.allObjects(typeof(Person)).last().Name == sortedPersons.first().Name);
status += "\nSorting " + sortedPersons.last().Name + " == " + realm.allObjects(typeof(Person)).first().Name;
realm.close();
return(status);
}
