public Nametable32(Func <Stream> stream_gen)
{
PType tp_elem = new PTypeRecord(
new NamedType("code", new PType(PTypeEnumeration.integer)),
new NamedType("str", new PType(PTypeEnumeration.sstring)));
cod_str = new UniversalSequenceBase(tp_elem, stream_gen());
offsets = new UniversalSequenceBase(new PType(PTypeEnumeration.longinteger), stream_gen());
index_str = new IndexKey32CompImmutable(stream_gen, cod_str, ob => true,
ob => Hashfunctions.HashRot13((string)((object[])ob)[1]), null);
dyna_index = new Dictionary <string, int>();
}
public Nametable32(Func <Stream> stream_gen)
{
PType tp_elem = new PTypeRecord(
new NamedType("code", new PType(PTypeEnumeration.integer)),
new NamedType("str", new PType(PTypeEnumeration.sstring)));
table = new UniversalSequenceBase(tp_elem, stream_gen());
str_offsets = new UniversalSequence <long>(new PType(PTypeEnumeration.longinteger), stream_gen());
Comparer <object> comp_str = Comparer <object> .Create(new Comparison <object>((object a, object b) =>
{
var aa = (string)((object[])a)[1];
var bb = (string)((object[])b)[1];
return(aa.CompareTo(bb));
}));
name_index = new IndexKey32CompImm(stream_gen, table,
ob => Hashfunctions.HashRot13((string)((object[])ob)[1]), comp_str);
dyna_index = new Dictionary <string, int>();
}
public void Indexes(int[] cnoms)
{
if (tp_element.Vid != PTypeEnumeration.record)
{
throw new Exception("Err in TableReletional Indexes: Type of element is not record");
}
allindexes = new IIndexCommon[cnoms.Length];
PTypeRecord tp_r = (PTypeRecord)tp_element;
this.cnoms = cnoms;
int i = 0;
foreach (int nom in cnoms)
{
if (nom < 0 || nom > tp_r.Fields.Length)
{
throw new Exception("Err in TableRelational Indexes: element number is out of range");
}
PType tp = tp_r.Fields[nom].Type;
if (tp.Vid == PTypeEnumeration.integer)
{
Func <object, int> keyproducer = v => (int)((object[])((object[])v)[1])[nom];
IndexKeyImmutable <int> ind_arr = new IndexKeyImmutable <int>(getstream())
{
Table = table,
KeyProducer = keyproducer,
Scale = null
};
ind_arr.Scale = new ScaleCell(getstream())
{
IndexCell = ind_arr.IndexCell
};
IndexDynamic <int, IndexKeyImmutable <int> > index = new IndexDynamic <int, IndexKeyImmutable <int> >(true, ind_arr);
allindexes[i] = index;
table.RegisterIndex(index);
}
else if (tp.Vid == PTypeEnumeration.sstring)
{
IndexHalfkeyImmutable <string> index_arr = new IndexHalfkeyImmutable <string>(getstream())
{
Table = table,
KeyProducer = v => (string)((object[])((object[])v)[1])[nom],
HalfProducer = v => Hashfunctions.HashRot13(v)
};
index_arr.Scale = new ScaleCell(getstream())
{
IndexCell = index_arr.IndexCell
};
IndexDynamic <string, IndexHalfkeyImmutable <string> > index =
new IndexDynamic <string, IndexHalfkeyImmutable <string> >(false, index_arr);
allindexes[i] = index;
table.RegisterIndex(index);
}
else
{
throw new Exception($"Err: vid {tp.Vid} is not implemented in TableRelational Indexes");
}
i++;
}
//BuildIndexes();
}
public static void Main5(string[] args)
{
Random rnd = new Random();
Console.WriteLine("Start Task04_Sequenses_Main4");
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
PType tp_person = new PTypeRecord(
new NamedType("id", new PType(PTypeEnumeration.integer)),
new NamedType("name", new PType(PTypeEnumeration.sstring)),
new NamedType("age", new PType(PTypeEnumeration.real)));
TableView tab_person = new TableView(path + "tab_person.pac", tp_person);
IndexHalfkeyImmutable <string> name_index = new IndexHalfkeyImmutable <string>(path + "name_hindex.pac")
{
Table = tab_person,
KeyProducer = v => (string)((object[])((object[])v)[1])[1],
HalfProducer = v => Hashfunctions.HashRot13(v)
};
name_index.Scale = new ScaleCell(path + "person_ind")
{
IndexCell = name_index.IndexCell
};
IndexDynamic <string, IndexHalfkeyImmutable <string> > index_person_name =
new IndexDynamic <string, IndexHalfkeyImmutable <string> >(false, name_index);
tab_person.RegisterIndex(index_person_name);
int nelements = 1_000_000;
bool toload = true; // Загружать или нет новую базу данных
if (toload)
{
sw.Restart();
// Очистим ячейки последовательности и индекса
tab_person.Clear();
IEnumerable <object> flow = Enumerable.Range(0, nelements)
.Select(i =>
{
int id = nelements - i;
string name = "=" + id.ToString() + "=";
double age = rnd.NextDouble() * 100.0;
return(new object[] { id, name, age });
});
tab_person.Fill(flow);
// Теперь надо отсортировать индексный массив по ключу
tab_person.BuildIndexes();
sw.Stop();
Console.WriteLine("Load ok. duration for {0} elements: {1} ms", nelements, sw.ElapsedMilliseconds);
}
else
{
sw.Restart();
tab_person.Warmup();
sw.Stop();
Console.WriteLine("Warmup ok. duration for {0} elements: {1} ms", nelements, sw.ElapsedMilliseconds);
}
// Проверим работу
int search_key = nelements * 2 / 3;
var ob = index_person_name.GetAllByKey("=" + search_key + "=")
.Select(ent => ((object[])ent.Get())[1])
.FirstOrDefault();
if (ob == null)
{
throw new Exception("Didn't find person " + search_key);
}
Console.WriteLine("Person {0} has name {1}", search_key, ((object[])ob)[1]);
// Засечем скорость выборок
int nprobe = 1000;
sw.Restart();
for (int i = 0; i < nprobe; i++)
{
search_key = rnd.Next(nelements) + 1;
ob = index_person_name.GetAllByKey("=" + search_key + "=")
.Select(ent => ((object[])ent.Get())[1])
.FirstOrDefault();
if (ob == null)
{
throw new Exception("Didn't find person " + search_key);
}
string nam = (string)((object[])ob)[1];
}
sw.Stop();
Console.WriteLine($"Duration for {nprobe} search in {nelements} elements: {sw.ElapsedMilliseconds} ms");
}
//static string path = "Databases/";
public static void Main6()
{
Random rnd = new Random();
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
Console.WriteLine("Start demo of table and Universal Index with PagedStorage and id as string");
// Тип основной таблицы
PType tp_person = new PTypeRecord(
new NamedType("id", new PType(PTypeEnumeration.sstring)),
new NamedType("name", new PType(PTypeEnumeration.sstring)),
new NamedType("age", new PType(PTypeEnumeration.real)));
// ======================== Страничное хранилище возьмем из описания PagedStreamStore =========================
//PagedStreamStore ps_store = new PagedStreamStore(path + "storage.bin", 4); // заказали 4 стрима, конкретные будут: ps_store[i]
StreamStorage ps_store = new StreamStorage(dbpath + "storage6uindex.bin", 4);
// База данных такая же, как и в программе 4, только идентификатор определен как строка, придется воспользоваться полуключем
TableView tab_person;
IndexHalfkeyImmutable <string> index_id_arr;
IndexDynamic <string, IndexHalfkeyImmutable <string> > index_id;
// Подключение к таблице
tab_person = new TableView(ps_store[0], tp_person);
// Подключение к индексу по уникальному идентификатору (нулевое поле)
Func <object, string> person_id_keyproducer = v => (string)((object[])((object[])v)[1])[0];
index_id_arr = new IndexHalfkeyImmutable <string>(ps_store[1])
{
Table = tab_person,
KeyProducer = person_id_keyproducer,
HalfProducer = s => Hashfunctions.HashRot13(s),
Scale = null
};
index_id_arr.Scale = new ScaleCell(ps_store[2])
{
IndexCell = index_id_arr.IndexCell
};
index_id = new IndexDynamic <string, IndexHalfkeyImmutable <string> >(true)
{
Table = tab_person,
IndexArray = index_id_arr,
KeyProducer = person_id_keyproducer
};
tab_person.RegisterIndex(index_id);
int nelements = 1000000;
bool toload = false; // Загружать или нет новую базу данных
if (toload)
{
sw.Restart();
// Очистим ячейки последовательности и индекса
tab_person.Clear();
IEnumerable <object> flow = Enumerable.Range(0, nelements)
.Select(i =>
{
int id = nelements - i;
string name = "=" + id.ToString() + "=";
double age = rnd.NextDouble() * 100.0;
return(new object[] { id.ToString(), name, age });
});
tab_person.Fill(flow);
// Теперь надо отсортировать индексный массив по ключу
tab_person.BuildIndexes();
sw.Stop();
Console.WriteLine("Load ok. duration for {0} elements: {1} ms", nelements, sw.ElapsedMilliseconds);
}
else
{
// Загрузка кеша ускоряет обработку
sw.Restart();
ps_store.LoadCache();
sw.Stop();
Console.WriteLine("Cache load duration={0}", sw.ElapsedMilliseconds);
}
// Проверим работу
int search_key = nelements * 2 / 3;
var ob = index_id.GetAllByKey(search_key.ToString())
.Select(ent => ((object[])ent.Get())[1])
.FirstOrDefault();
if (ob == null)
{
throw new Exception("Didn't find person " + search_key);
}
Console.WriteLine("Person {0} has name {1}", search_key, ((object[])ob)[1]);
// Засечем скорость выборок
int nprobes = 10000;
sw.Restart();
for (int i = 0; i < nprobes; i++)
{
search_key = rnd.Next(nelements) + 1;
ob = index_id.GetAllByKey(search_key.ToString())
.Select(ent => ((object[])ent.Get())[1])
.FirstOrDefault();
if (ob == null)
{
throw new Exception("Didn't find person " + search_key);
}
string nam = (string)((object[])ob)[1];
}
sw.Stop();
Console.WriteLine("Duration for {0} search in {1} elements: {2} ms", nprobes, nelements, sw.ElapsedMilliseconds);
}