// #end example
private void storeInitialObjects(DatabaseSupportWithReadWriteLock dbSupport)
{
dbSupport.InWriteTransaction(
container =>
{
container.Store(new Person("Joe"));
container.Store(new Person("Jan"));
container.Store(new Person("Joanna"));
container.Store(new Person("Phil"));
});
}
// #example: Use a read transaction for reading objects
private void ListAllPeople(DatabaseSupportWithReadWriteLock dbSupport)
{
dbSupport.InReadTransaction(
container =>
{
var result = from Person p in container select p;
foreach (Person person in result)
{
Console.WriteLine(person.Name);
}
});
}
// #end example
// #example: Use a write transaction to update objects
private void UpdateAllJoes(DatabaseSupportWithReadWriteLock dbSupport)
{
dbSupport.InWriteTransaction(
container =>
{
var allJoes = from Person p in container
where p.Name == "Joe"
select p;
foreach (Person joe in allJoes)
{
joe.Name = "New Joe";
container.Store(joe);
}
});
}
public void Main()
{
using (var database = new DatabaseSupportWithReadWriteLock(Db4oEmbedded.OpenFile("database.db4o")))
{
storeInitialObjects(database);
// Schedule back-ground tasks
Action<DatabaseSupportWithReadWriteLock> toRun = UpdateAllJoes;
var waitHandle = toRun.BeginInvoke(database, null, null);
// While doing other work
ListAllPeople(database);
// Wait for the task to finish
toRun.EndInvoke(waitHandle);
}
}
