static readonly string s_systemDir = "SortedObjects"; // appended to SessionBase.BaseDatabasePath for a full path
static void Main(string[] args)
{
try
{
Oid bTreeId;
bool createOnly = args.Length > 0;
UInt64 someRandomPersonsIdNumber = 0;
using (SessionNoServer session = new SessionNoServer(s_systemDir))
{
Console.WriteLine("Running with databases in directory: " + session.SystemDirectory);
const UInt32 numberOfPersons = 1000000;
const ushort nodeMaxSize = 5000;
const ushort comparisonByteArraySize = sizeof(UInt64); // enough room to hold entire idNumber of a Person
const bool comparisonArrayIsCompleteKey = true;
const bool addIdCompareIfEqual = false;
Person person;
session.BeginUpdate();
CompareByField <Person> compareByField = new CompareByField <Person>("idNumber", session, addIdCompareIfEqual);
BTreeSet <Person> bTree = new BTreeSet <Person>(compareByField, session, nodeMaxSize, comparisonByteArraySize, comparisonArrayIsCompleteKey);
session.Persist(bTree); // Persist the root of the BTree so that we have something persisted that can be flushed to disk if memory available becomes low
for (int i = 0; i < numberOfPersons; i++)
{
person = new Person();
if (i % 1000 == 0)
{
someRandomPersonsIdNumber = person.IdNumber;
}
bTree.AddFast(person);
}
bTreeId = bTree.Oid;
session.Commit();
}
if (!createOnly)
{
using (SessionNoServer session = new SessionNoServer(s_systemDir))
{
session.BeginRead();
BTreeSet <Person> bTree = session.Open <BTreeSet <Person> >(bTreeId);
foreach (Person person in (IEnumerable <Person>)bTree)
{
if (person.IdNumber > 196988888791402)
{
Console.WriteLine(person);
break;
}
}
session.Commit();
session.BeginRead();
Person lookupPerson = new Person(someRandomPersonsIdNumber);
UInt64 id = bTree.GetKeyId(lookupPerson); // lookup without opening object having the key field value of someRandomPersonsIdNumber
Person lookedUpPerson = null;
bTree.TryGetKey(lookupPerson, ref lookedUpPerson);
if (id != lookedUpPerson.Id)
{
throw new UnexpectedException("Should match");
}
// this LINQ statement will trigger a binary search lookup (not a linear serach) of the matching Person objects in the BTreeSet
Console.WriteLine((from person in bTree where person.IdNumber > 196988888791402 select person).First());
session.Commit();
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
static readonly string s_systemDir = "SortedObjects"; // appended to SessionBase.BaseDatabasePath for a full path
static void Main(string[] args)
{
try
{
Oid bTreeId;
bool createOnly = args.Length > 0;
UInt64 someRandomPersonsIdNumber = 0;
using (SessionNoServer session = new SessionNoServer(s_systemDir))
{
Console.WriteLine("Running with databases in directory: " + session.SystemDirectory);
const UInt32 numberOfPersons = 1000000;
const ushort nodeMaxSize = 5000;
const ushort comparisonByteArraySize = sizeof(UInt64); // enough room to hold entire idNumber of a Person
const bool comparisonArrayIsCompleteKey = true;
const bool addIdCompareIfEqual = false;
Person person;
session.BeginUpdate();
CompareByField<Person> compareByField = new CompareByField<Person>("idNumber", session, addIdCompareIfEqual);
BTreeSet<Person> bTree = new BTreeSet<Person>(compareByField, session, nodeMaxSize, comparisonByteArraySize, comparisonArrayIsCompleteKey);
session.Persist(bTree); // Persist the root of the BTree so that we have something persisted that can be flushed to disk if memory available becomes low
for (int i = 0; i < numberOfPersons; i++)
{
person = new Person();
if (i % 1000 == 0)
someRandomPersonsIdNumber = person.IdNumber;
bTree.AddFast(person);
}
bTreeId = bTree.Oid;
session.Commit();
}
if (!createOnly)
using (SessionNoServer session = new SessionNoServer(s_systemDir))
{
session.BeginRead();
BTreeSet<Person> bTree = (BTreeSet<Person>)session.Open(bTreeId);
foreach (Person person in (IEnumerable<Person>)bTree)
{
if (person.IdNumber > 196988888791402)
{
Console.WriteLine(person);
break;
}
}
session.Commit();
session.BeginRead();
Person lookupPerson = new Person(someRandomPersonsIdNumber);
UInt64 id = bTree.GetKeyId(lookupPerson); // lookup without opening object having the key field value of someRandomPersonsIdNumber
Person lookedUpPerson = null;
bTree.TryGetKey(lookupPerson, ref lookedUpPerson);
if (id != lookedUpPerson.Id)
throw new UnexpectedException("Should match");
// this LINQ statement will trigger a binary search lookup (not a linear serach) of the matching Person objects in the BTreeSet
Console.WriteLine((from person in bTree where person.IdNumber > 196988888791402 select person).First());
session.Commit();
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}