public TextDeferredIndexer(DBreezeEngine engine)
{
this.DBreezeEngine = engine;
LTrieSettings = new TrieSettings()
{
InternalTable = true
};
Storage = new StorageLayer(Path.Combine(engine.MainFolder, TableFileName), LTrieSettings, engine.Configuration);
LTrie = new LTrie(Storage);
LTrie.TableName = "DBreeze.TextIndexer";
if (LTrie.Storage.Length > 100000) //Recreating file if its size more then 100KB and it is empty
{
if (LTrie.Count(true) == 0)
{
LTrie.Storage.RecreateFiles();
LTrie.Dispose();
Storage = new StorageLayer(Path.Combine(engine.MainFolder, TableFileName), LTrieSettings, engine.Configuration);
LTrie = new LTrie(Storage);
LTrie.TableName = "DBreeze.TextIndexer";
}
}
if (LTrie.Count(true) > 0)
this.StartDefferedIndexing();
}
//public LTrieWriteCache(IStorage storage, bool overWriteIsAllowed)
public LTrieWriteCache(LTrie trie)
{
Trie = trie;
DefaultPointerLen = Trie.Storage.TrieSettings.POINTER_LENGTH;
////Represents pointer to the root of DefaultPointerLen size
//rootPointerAsByte = ((ulong)Trie.Storage.TrieSettings.ROOT_START).To_8_bytes_array_BigEndian().Substring(8 - DefaultPointerLen, DefaultPointerLen);
IsNestedTable = Trie.Storage.TrieSettings.IsNestedTable;
}
public LTrieRootNode(LTrie tree)
{
Tree = tree;
DefaultPointerLen = Tree.Storage.TrieSettings.POINTER_LENGHT;
DefaultRootSize = Tree.Storage.TrieSettings.ROOT_SIZE;
//me = new byte[Tree.Storage.TreeSettings.ROOT_SIZE];
LinkToZeroNode = new byte[DefaultPointerLen];
this.EmptyPointer = new byte[DefaultPointerLen];
//Reading Root Node
this.ReadRootNode();
}
private void RestoreNotFinishedTransactions()
{
//TODO Trie settings from the table must be taken from schema (when they will differ)
//STORE FILE NAME of rollback not table name
try
{
byte[] btCommittedTablesNames = null;
List <string> committedTablesNames = new List <string>();
if (LTrie.Count(false) == 0) //All ok
{
LTrie.RemoveAll(true);
return;
}
string physicalPathToTheUserTable = String.Empty;
//Settigns and storage for Committed tables !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MUST BE TAKEN FROM SCHEMA, FOR NOW DEFAULT
TrieSettings ltrSet = null;
IStorage storage = null;
DBreeze.LianaTrie.LTrie ltrie = null;
foreach (var row in LTrie.IterateForward())
{
btCommittedTablesNames = row.GetFullValue(true);
committedTablesNames = System.Text.Encoding.UTF8.GetString(btCommittedTablesNames).DeserializeXml <List <string> >();
foreach (var fn in committedTablesNames)
{
//Trying to get path from the Schema, there is universal function for getting table physical TABLE FULL PATH /NAME
physicalPathToTheUserTable = Engine.DBreezeSchema.GetPhysicalPathToTheUserTable(fn);
//Returned path can be empty, if no more such table
if (physicalPathToTheUserTable == String.Empty)
{
continue;
}
//We don't restore in-memory tables
if (physicalPathToTheUserTable == "MEMORY")
{
continue;
}
//we open ltrie, and it automatically restores rollback
ltrSet = new TrieSettings(); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MUST BE TAKEN FROM SCHEMA, FOR NOW DEFAULT
//storage = new TrieDiskStorage(physicalPathToTheUserTable, ltrSet, Engine.Configuration);
storage = new StorageLayer(physicalPathToTheUserTable, ltrSet, Engine.Configuration);
ltrie = new LTrie(storage);
//closing trie, that Schema could open it again
ltrie.Dispose();
////Deleting rollback file for such table
//physicalPathToTheUserTable += ".rol";
//System.IO.File.Delete(physicalPathToTheUserTable);
}
committedTablesNames.Clear();
}
//If all ok, recreate file
LTrie.RemoveAll(true);
}
catch (OperationCanceledException ex)
{
throw ex;
}
//catch (System.Threading.ThreadAbortException ex)
//{
// //We don'T make DBisOperable = false;
// throw ex;
//}
catch (Exception ex)
{
//BRINGS TO DB NOT OPERATABLE
this.Engine.DBisOperable = false;
this.Engine.DBisOperableReason = "TransactionsCoordinator.RestoreNotFinishedTransaction";
//NOT CASCADE ADD EXCEPTION
throw DBreezeException.Throw(DBreezeException.eDBreezeExceptions.CLEAN_ROLLBACK_FILES_FOR_FINISHED_TRANSACTIONS_FAILED);
}
}
/* TODO
* 1. HERE we will add TableNames as RegEx with settings
* 2. Checking Reserverd TableNames prefixes
* 3. User TableName must start from @ut
* 4. GetPhysicalPathToTheUserTable - File with DIrectory Settings for different tables parser (to make reside different tables in different HDDs or even network drives)
*/
private void OpenSchema()
{
LTrieSettings = new TrieSettings()
{
InternalTable = true,
//SkipStorageBuffer = true
};
Storage = new StorageLayer(Path.Combine(Engine.MainFolder, SchemaFileName), LTrieSettings, Engine.Configuration);
LTrie = new LTrie(Storage);
LTrie.TableName = "DBreeze.Scheme";
//Reading lastFileNumber
ReadUserLastFileNumber();
}
/// <summary>
/// Returns table for READ, WRITE FUNC
/// </summary>
/// <param name="userTableName"></param>
/// <returns></returns>
internal LTrie GetTable(string userTableName)
{
string tableName = GetUserTableNameAsString(userTableName);
//TODO pattern based mapping If table doesn't exist we create it with properties which could be supplied after db init as regex theme.
//Schema protocol: 2 bytes - protocol version, other data
//For protocol 1: first 8 bytes will be TheFileName, starting from db10000-dbN (0-N ulong). up to 10000 are reserved for dbreeze.
//Table names are UTF-8 based, no limits
ulong fileName = 0;
OpenTable otl = null;
_sync_openTablesHolder.EnterUpgradeableReadLock();
try
{
_openTablesHolder.TryGetValue(tableName, out otl);
if (otl != null)
{
//Try to increase usage and return LTrie
otl.Add();
return otl.Trie;
}
//Probably table Exists in db but not in openTablesHolder
_sync_openTablesHolder.EnterWriteLock();
try
{
//UpgradeableRead recheck
_openTablesHolder.TryGetValue(tableName, out otl);
if (otl != null)
{
//Try to increase usage and return LTrie
otl.Add();
return otl.Trie;
}
byte[] btTableName = GetUserTableNameAsByte(userTableName);
//Trying to get fileName from cache
fileName = this.cachedTableNames.GetFileName(tableName);
// LTrieRow row = null;
bool tableExists = false;
if (fileName == 0)
{
LTrieRow row = LTrie.GetKey(btTableName, false);
if (row.Exists)
{
tableExists = true;
byte[] fullValue = row.GetFullValue(false);
//Can be parsed different. First protocol version is 1
ushort schemeProtocol = fullValue.Substring(0, 2).To_UInt16_BigEndian();
switch (schemeProtocol)
{
case 1:
fileName = fullValue.Substring(2, 8).To_UInt64_BigEndian();
break;
default:
throw DBreezeException.Throw(DBreezeException.eDBreezeExceptions.SCHEME_FILE_PROTOCOL_IS_UNKNOWN);
}
}
else
{
tableExists = false;
//Creating new table.
//Checking table name validity
//this will throw exception, if not valid
DbUserTables.UserTableNameIsOk(userTableName);
//Creating such table and renewing LastFileNumber counter
//Adding to LastFileNumber
LastFileNumber++;
////Deleting physical files related to the table, if they existed - normally they should not
//DeleteAllReleatedTableFiles(Path.Combine(Engine.MainFolder, LastFileNumber.ToString()));
byte[] lft = LastFileNumber.To_8_bytes_array_BigEndian();
//Writing this number to Schema file
LTrie.Add(Encoding.UTF8.GetBytes(LastFileNumberKeyName), lft);
//Creating table self and writing to Schema file
LTrie.Add(btTableName,
new byte[] { 0, 1 } //Protocol version 1
.Concat(lft)); //Number of the file
//Committing both records
LTrie.Commit();
fileName = LastFileNumber;
this.cachedTableNames.Add(tableName, fileName);
}
}
else
tableExists = true;
//Creating LTrie, adding it to _openTablesHolder
//Seeting up Trie TableName, OTHER SETTINGS
TrieSettings ts = new TrieSettings();
IStorage storage = null;
////Checking if default Flusg Disk behaviour was overriden
//ts.DiskFlushBehaviour = Engine.Configuration.DiskFlushBehaviour;
////Checking if we have alternative DiskFlush behaviour
//foreach (var pattern in Engine.Configuration.AlternativeDiskFlushBehaviour)
//{
// //pattern.Key
// if (DbUserTables.PatternsIntersect(pattern.Key, userTableName))
// {
// ts.DiskFlushBehaviour = pattern.Value;
// break;
// }
//}
string alternativeTableLocation = String.Empty;
if (CheckAlternativeTableLocationsIntersections(userTableName, out alternativeTableLocation))
{
ts.StorageWasOverriden = true;
if (alternativeTableLocation == String.Empty)
{
ts.AlternativeTableStorageType = DBreezeConfiguration.eStorage.MEMORY;
storage = new StorageLayer(Path.Combine(Engine.MainFolder, fileName.ToString()), ts, Engine.Configuration);
}
else
{
ts.AlternativeTableStorageType = DBreezeConfiguration.eStorage.DISK;
ts.AlternativeTableStorageFolder = alternativeTableLocation;
DirectoryInfo diAlt = new DirectoryInfo(alternativeTableLocation);
if (!diAlt.Exists)
diAlt.Create();
if (!tableExists)
{
//Deleting physical files related to the table, if they existed - normally they should not
DeleteAllReleatedTableFiles(Path.Combine(ts.AlternativeTableStorageFolder, LastFileNumber.ToString()));
}
storage = new StorageLayer(Path.Combine(ts.AlternativeTableStorageFolder, fileName.ToString()), ts, Engine.Configuration);
}
}
else
{
if (!tableExists)
{
//Deleting physical files related to the table, if they existed - normally they should not
DeleteAllReleatedTableFiles(Path.Combine(Engine.MainFolder, LastFileNumber.ToString()));
}
storage = new StorageLayer(Path.Combine(Engine.MainFolder, fileName.ToString()), ts, Engine.Configuration);
}
//storage = new StorageLayer(Path.Combine(Engine.MainFolder, fileName.ToString()), ts, Engine.Configuration);
LTrie trie = new LTrie(storage);
//Setting LTrie user table name
trie.TableName = userTableName;
//_openTablesHolder.Add(tableName, trie);
//Automatically increased usage in OpenTable constructor
_openTablesHolder.Add(tableName, new OpenTable(trie));
return trie;
}
catch (System.Exception ex)
{
//CASCADE
throw ex;
}
finally
{
_sync_openTablesHolder.ExitWriteLock();
}
}
catch (Exception ex)
{
throw DBreezeException.Throw(DBreezeException.eDBreezeExceptions.SCHEME_GET_TABLE_WRITE_FAILED, tableName, ex);
}
finally
{
_sync_openTablesHolder.ExitUpgradeableReadLock();
}
}
private void RestoreNotFinishedTransactions()
{
//TODO Trie settings from the table must be taken from schema (when they will differ)
//STORE FILE NAME of rollback not table name
try
{
byte[] btCommittedTablesNames =null;
List<string> committedTablesNames = new List<string>();
if (LTrie.Count(false) == 0) //All ok
{
LTrie.RemoveAll(true);
return;
}
string physicalPathToTheUserTable = String.Empty;
//Settigns and storage for Committed tables !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MUST BE TAKEN FROM SCHEMA, FOR NOW DEFAULT
TrieSettings ltrSet = null;
IStorage storage = null;
DBreeze.LianaTrie.LTrie ltrie = null;
foreach (var row in LTrie.IterateForward())
{
btCommittedTablesNames = row.GetFullValue(true);
committedTablesNames = System.Text.Encoding.UTF8.GetString(btCommittedTablesNames).DeserializeXml<List<string>>();
foreach (var fn in committedTablesNames)
{
//Trying to get path from the Schema, there is universal function for getting table physical TABLE FULL PATH /NAME
physicalPathToTheUserTable = Engine.DBreezeSchema.GetPhysicalPathToTheUserTable(fn);
//Returned path can be empty, if no more such table
if (physicalPathToTheUserTable == String.Empty)
continue;
//We don't restore in-memory tables
if (physicalPathToTheUserTable == "MEMORY")
continue;
//we open ltrie, and it automatically restores rollback
ltrSet = new TrieSettings(); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MUST BE TAKEN FROM SCHEMA, FOR NOW DEFAULT
//storage = new TrieDiskStorage(physicalPathToTheUserTable, ltrSet, Engine.Configuration);
storage = new StorageLayer(physicalPathToTheUserTable, ltrSet, Engine.Configuration);
ltrie = new LTrie(storage);
//closing trie, that Schema could open it again
ltrie.Dispose();
////Deleting rollback file for such table
//physicalPathToTheUserTable += ".rol";
//System.IO.File.Delete(physicalPathToTheUserTable);
}
committedTablesNames.Clear();
}
//If all ok, recreate file
LTrie.RemoveAll(true);
}
catch (OperationCanceledException ex)
{
throw ex;
}
//catch (System.Threading.ThreadAbortException ex)
//{
// //We don'T make DBisOperable = false;
// throw ex;
//}
catch (Exception ex)
{
//BRINGS TO DB NOT OPERATABLE
this.Engine.DBisOperable = false;
this.Engine.DBisOperableReason = "TransactionsCoordinator.RestoreNotFinishedTransaction";
//NOT CASCADE ADD EXCEPTION
throw DBreezeException.Throw(DBreezeException.eDBreezeExceptions.CLEAN_ROLLBACK_FILES_FOR_FINISHED_TRANSACTIONS_FAILED);
}
}
private void Init()
{
try
{
LTrieSettings = new TrieSettings()
{
InternalTable = true,
//SkipStorageBuffer = true
};
Storage = new StorageLayer(Path.Combine(Engine.MainFolder, JournalFileName), LTrieSettings, Engine.Configuration);
//Storage = new TrieDiskStorage(Path.Combine(Engine.MainFolder, JournalFileName), LTrieSettings, Engine.Configuration);
LTrie = new LTrie(Storage);
LTrie.TableName = "DBreeze.TranJournal";
this.RestoreNotFinishedTransactions();
}
catch (Exception ex)
{
//CASCADE
throw ex;
}
}
public void FinishTransaction(ulong tranNumber)
{
//_sync_transactionsTables.EnterReadLock();
_sync_transactionsTables.EnterWriteLock();
try
{
Dictionary<string, ITransactable> tbls = null;
_transactionsTables.TryGetValue(tranNumber, out tbls);
if (tbls != null)
{
//Starting procedure
//1. Saving all table names into db - needed in case if something happens (Power loss or whatever).
// Then restarted TransactionalJournal will delete rollback files for these tables (they are all committed)
List<string> committedTablesNames = new List<string>();
foreach (var tt in tbls)
{
committedTablesNames.Add(tt.Key);
}
string serTbls = committedTablesNames.SerializeXml();
byte[] btSerTbls = System.Text.Encoding.UTF8.GetBytes(serTbls);
byte[] key = tranNumber.To_8_bytes_array_BigEndian();
LTrie.Add(ref key, ref btSerTbls);
LTrie.Commit();
//2. Calling transaction End for all tables
try
{
foreach (var tt in tbls)
{
tt.Value.ITRCommitFinished();
}
}
catch (Exception ex)
{
//CASCADE from ITRCommitFinished, brings to NON-OPERATABLE
throw ex;
}
//3. Deleting Record in Journal
LTrie.Remove(ref key);
LTrie.Commit();
//Clearing transaction number
tbls.Clear();
_transactionsTables.Remove(tranNumber);
//When Transaction File becomes big we try to clean it.
if (LTrie.Storage.Length > MaxlengthOfTransactionFile && _transactionsTables.Count() == 0)
{
LTrie.Storage.RecreateFiles();
LTrie.Dispose();
Storage = new StorageLayer(Path.Combine(Engine.MainFolder, JournalFileName), LTrieSettings, Engine.Configuration);
LTrie = new LTrie(Storage);
LTrie.TableName = "DBreeze.TranJournal";
}
}
}
catch (System.Exception ex)
{
//CASCADE
throw ex;
}
finally
{
_sync_transactionsTables.ExitWriteLock();
//_sync_transactionsTables.ExitReadLock();
}
}
//object lock_nestedTblAccess = new object();
/// <summary>
///
/// </summary>
/// <param name="row"></param>
/// <param name="tableIndex"></param>
/// <param name="masterTrie"></param>
/// <param name="insertTable">Regulates if InsertTable or SelectTable was called (ability to create table if it doesn't exist)</param>
/// <param name="useCache">Regulates READ table thread or WRITE table thread - visibilityscope</param>
/// <returns></returns>
public NestedTable GetTable(LTrieRow row, ref byte[] btKey, uint tableIndex, LTrie masterTrie, bool insertTable, bool useCache)
{
//Console.WriteLine(useCache.ToString() + " " + System.Threading.Thread.CurrentThread.ManagedThreadId.ToString());
try
{
if (!insertTable && !row.Exists)
{
//For Readers, which couldn't allocate table, we return empty DbInTable
return new NestedTable(null, false, false);
}
if (insertTable)
{
//settign up modification thread
this.NestedTablesCoordinator.ModificationThreadId = System.Threading.Thread.CurrentThread.ManagedThreadId;
}
if (masterTrie == null)
masterTrie = this;
NestedTableInternal dit = null; //this one we will return
byte[] fullValuePointer = null;
if (insertTable)
TableIsModified = true; //flag will permit commit and rollback
byte[] val = null;
long Id_RootStart = 0;
if (row.Exists)
{
val = row.GetPartialValue(tableIndex * this.Storage.TrieSettings.ROOT_SIZE, this.Storage.TrieSettings.ROOT_SIZE, useCache);
if (val == null || val.Length < this.Storage.TrieSettings.ROOT_SIZE)
{
//For Readers, which couldn't allocate table, we return empty DbInTable
if (!insertTable)
{
return new NestedTable(null, false, false);
}
//Here can appear only WRITERS, which couldn't allocate table
byte[] btValue = new byte[this.Storage.TrieSettings.ROOT_SIZE];
long valueStartPointer = 0;
fullValuePointer = this.AddPartially(ref btKey, ref btValue, tableIndex * this.Storage.TrieSettings.ROOT_SIZE, out valueStartPointer);
Id_RootStart = valueStartPointer + (tableIndex * this.Storage.TrieSettings.ROOT_SIZE);
lock (this.NestedTablesCoordinator.lock_nestedTblAccess)
{
dit = new DataTypes.NestedTableInternal(true, masterTrie, Id_RootStart, (tableIndex * this.Storage.TrieSettings.ROOT_SIZE), false,this,ref btKey);
this.NestedTablesCoordinator.AddNestedTable(ref btKey, fullValuePointer.DynamicLength_To_UInt64_BigEndian(), Id_RootStart, dit);
//if (!insertTable)
//{
//If we open the table for read, we increase read value
dit.quantityOpenReads++;
//}
}
}
else
{
//then we must open/create DbInTable
Id_RootStart = row.ValueStartPointer + (tableIndex * this.Storage.TrieSettings.ROOT_SIZE);
fullValuePointer = row.LinkToValue;
lock (this.NestedTablesCoordinator.lock_nestedTblAccess)
{
dit = this.NestedTablesCoordinator.GetTable(ref btKey, Id_RootStart);
if (dit == null)
{
dit = new DataTypes.NestedTableInternal(true, masterTrie, Id_RootStart, (tableIndex * this.Storage.TrieSettings.ROOT_SIZE), useCache, this, ref btKey);
this.NestedTablesCoordinator.AddNestedTable(ref btKey, fullValuePointer.DynamicLength_To_UInt64_BigEndian(), Id_RootStart, dit);
}
//if (!insertTable)
//{
//If we open the table for read, we increase read value
dit.quantityOpenReads++;
//}
}
}
}
else
{
//Every new row with DbInTable starts from here
//Here can appear only WRITERS, which couldn't allocate table
//creating space for the root
byte[] btValue = new byte[this.Storage.TrieSettings.ROOT_SIZE];
//adding empty root to the place
long valueStartPointer = 0;
fullValuePointer = this.AddPartially(ref btKey, ref btValue, tableIndex * this.Storage.TrieSettings.ROOT_SIZE, out valueStartPointer);
Id_RootStart = valueStartPointer + (tableIndex * this.Storage.TrieSettings.ROOT_SIZE);
lock (this.NestedTablesCoordinator.lock_nestedTblAccess)
{
dit = new DataTypes.NestedTableInternal(true, masterTrie, Id_RootStart, (tableIndex * this.Storage.TrieSettings.ROOT_SIZE), false, this, ref btKey);
this.NestedTablesCoordinator.AddNestedTable(ref btKey, fullValuePointer.DynamicLength_To_UInt64_BigEndian(), Id_RootStart, dit);
//if (!insertTable)
//{
//If we open the table for read, we increase read value
dit.quantityOpenReads++;
//}
}
}
//Console.WriteLine("Creating NestedTable " + btKey.ToBytesString(""));
//this.NestedTablesCoordinator.AddNestedTable(ref btKey, fullValuePointer.DynamicLength_To_UInt64_BigEndian(), Id_RootStart, dit);
return new NestedTable(dit, insertTable, true);
}
catch (Exception ex)
{
this.RollBack();
//Cascade
throw ex;
}
}
//public OpenTable()
//{
// Add();
//}
public OpenTable(LTrie trie)
{
this.Trie = trie;
Add();
}
private void TestKrome()
{
using (var tran = engine.GetTransaction())
{
byte[] ptr = tran.InsertDataBlock("t1", null, new byte[] { 1, 2, 3 });
tran.Insert<int, byte[]>("t1", 1, ptr);
//NestedTable nt = tran.InsertTable<int>("t1", 1, 0);
//nt.Insert<int, int>(1, 1);
tran.Commit();
}
using (var tran = engine.GetTransaction())
{
var row = tran.Select<int,byte[]>("t1",1);
byte[] val = row.Value;
//NestedTable nt = tran.SelectTable<int>("t1", 1, 0);
//var row = nt.Select<int, int>(1);
tran.RemoveAllKeys("t1", true);
byte[] res = tran.SelectDataBlock("t1", val);
//Console.WriteLine("Key: {0}", row.Value);
}
return;
//using (var tran = engine.GetTransaction())
//{
// for (int i = 0; i < 1000000; i++)
// {
// tran.Insert<int, byte>("t1", i, 1);
// }
// tran.Commit();
//}
//Console.WriteLine("***");
//byte bt = 1;
//using (var tran = engine.GetTransaction())
//{
// DBreeze.Diagnostic.SpeedStatistic.StartCounter("a");
// foreach (var row in tran.SelectForward<int, byte>("t1"))
// {
// bt = row.Value;
// // Console.WriteLine("Key: {0}", row.Key);
// }
// DBreeze.Diagnostic.SpeedStatistic.PrintOut("a",true);
//}
//return;
using (var tran = engine.GetTransaction())
{
tran.Insert<int, byte>("t1", 1, 1);
tran.Insert<int, byte>("t2", 1, 1);
tran.Insert<int, byte>("t3", 1, 1);
tran.Commit();
}
using (var tran = engine.GetTransaction())
{
tran.SynchronizeTables("t2");
LTrieSettings = new TrieSettings();
LTrieStorage = new StorageLayer(@"E:\temp\DBreezeTest\DBR1\90000000", LTrieSettings, new DBreezeConfiguration());
LTrie = new LTrie(LTrieStorage);
LTrie.Add(((int)2).To_4_bytes_array_BigEndian(), ((int)2).To_4_bytes_array_BigEndian());
LTrie.Commit();
LTrie.Dispose();
var row = tran.Select<int, byte>("t2", 1);
Console.WriteLine("K: {0}", row.Value);
tran.RestoreTableFromTheOtherFile("t2", @"E:\temp\DBreezeTest\DBR1\90000000");
//row = tran.Select<int, byte>("t2", 1);
Console.WriteLine("K: {0}", row.Value);
}
using (var tran = engine.GetTransaction())
{
foreach (var row in tran.SelectBackward<int,int>("t2"))
{
Console.WriteLine("Key: {0}", row.Key);
}
}
}
/// <summary>
///
/// </summary>
private void InitLTrieAscii()
{
if (initLTrieAscii)
return;
//File.Delete(LianaTrieFileName);
initLTrieAscii = true;
LTrieSettings = new TrieSettings();
LTrieStorage = new StorageLayer(LianaTrieFileName, LTrieSettings, new DBreezeConfiguration());
//LTrieStorage = new TrieMemoryStorage(50 * 1024 * 1024, LTrieSettings);
LTrie = new LTrie(LTrieStorage);
}