internal Row(Table t, BinaryReader din, int pos, Row before)
{
tTable = t;
int index = tTable.IndexCount;
Pos = pos;
nFirstIndex = new Node(this, din, 0);
Node n = nFirstIndex;
for (int i = 1; i < index; i++)
{
n.nNext = new Node(this, din, i);
n = n.nNext;
}
int l = tTable.InternalColumnCount;
oData = Column.ReadData(din, l);
int iCurrent = din.ReadInt32();
LogHelper.Publish(String.Format("Row read with {0} columns. Row read position from file: {1}. Current position: {2}.", oData.Length, iCurrent, Pos), LogEntryType.Debug);
TracingHelper.Check(iCurrent == Pos, TracingHelper.INPUTSTREAM_ERROR);
Insert(before);
LastAccess = CurrentAccess++;
}
/// <summary>
/// Verify if the insert operation can be performed.
/// </summary>
/// <param name="row"></param>
internal void CheckInsert(object[] row)
{
if (_type == ConstraintType.Main || _type == ConstraintType.Unique)
{
// inserts in the main table are never a problem
// unique constraints are checked by the unique index
return;
}
// must be called synchronized because of _mainData
for (int i = 0; i < _len; i++)
{
object o = row[_refColumns[i]];
if (o == null)
{
// if one column is null then integrity is not checked
return;
}
_mainData[_mainColumns[i]] = o;
}
// a record must exist in the main table
TracingHelper.Check(_mainIndex.Find(_mainData) != null,
TracingHelper.INTEGRITY_CONSTRAINT_VIOLATION);
}
/// <summary>
/// Verify if the delete operation can be performed.
/// </summary>
/// <param name="row"></param>
internal void CheckDelete(object[] row)
{
if (_type == ConstraintType.ForeignKey || _type == ConstraintType.Unique)
{
// deleting references are never a problem
// unique constraints are checked by the unique index
return;
}
// must be called synchronized because of _refData
for (int i = 0; i < _len; i++)
{
object o = row[_mainColumns[i]];
if (o == null)
{
// if one column is null then integrity is not checked
return;
}
_refData[_refColumns[i]] = o;
}
// there must be no record in the 'slave' table
TracingHelper.Check(_refIndex.Find(_refData) == null,
TracingHelper.INTEGRITY_CONSTRAINT_VIOLATION);
}
public static string InputStreamTostring(BinaryReader reader)
{
StringWriter write = new StringWriter();
int blocksize = 8 * 1024; // todo: is this a good value?
char[] buffer = new char[blocksize];
try
{
while (true)
{
int l = reader.Read(buffer, 0, blocksize);
if (l == -1)
{
break;
}
write.Write(buffer, 0, l);
}
write.Close();
reader.Close();
}
catch (IOException e)
{
throw TracingHelper.Error(TracingHelper.INPUTSTREAM_ERROR, e.Message);
}
return(write.ToString());
}
/// <summary>
/// Checks a database object for the specified right.
/// </summary>
/// <param name="dbobject">Database object checking.</param>
/// <param name="right">Desired right.</param>
internal void Check(string dbobject, AccessType right)
{
if (_administrator)
{
return;
}
AccessType n;
n = (AccessType)_right[dbobject];
if ((n & right) != 0)
{
return;
}
if (_public != null)
{
n = (AccessType)(_public._right)[dbobject];
if ((n & right) != 0)
{
return;
}
}
throw TracingHelper.Error(TracingHelper.ACCESS_IS_DENIED);
}
/// <summary>
/// Finalizes a nested transaction.
/// </summary>
/// <param name="rollback"></param>
internal void EndNestedTransaction(bool rollback)
{
TracingHelper.Check(!_closed, TracingHelper.CONNECTION_IS_CLOSED);
TracingHelper.Assert(_nestedTransaction, "EndNestedTransaction");
int i = _transaction.Count - 1;
if (rollback)
{
while (i >= _nestedOldTransIndex)
{
Transaction t = (Transaction)_transaction[i];
t.Rollback();
i--;
}
}
_nestedTransaction = false;
_autoCommit = _nestedOldAutoCommit;
if (_autoCommit == true)
{
_transaction.RemoveRange(_nestedOldTransIndex, (_transaction.Count - _nestedOldTransIndex));
}
}
public bool CanRemove()
{
Node n = nFirstIndex;
while (n != null)
{
if (TracingHelper.AssertEnabled)
{
TracingHelper.Assert(n.iBalance != -2);
}
if (TracingHelper.StopEnabled)
{
TracingHelper.Stop();
}
if (n.iParent == 0 && n.nParent == null)
{
return(true);
}
n = n.nNext;
}
return(false);
}
private int[] ProcessColumnList(Tokenizer tokenizer, Table table)
{
ArrayList v = new ArrayList();
tokenizer.GetThis("(");
while (true)
{
v.Add(tokenizer.GetString());
string sToken = tokenizer.GetString();
if (sToken.Equals(")"))
{
break;
}
if (!sToken.Equals(","))
{
throw TracingHelper.Error(TracingHelper.UnexpectedToken, sToken);
}
}
int s = v.Count;
int[] col = new int[s];
for (int i = 0; i < s; i++)
{
col[i] = table.GetColumnNumber((string)v[i]);
}
return(col);
}
/// <summary>
/// Check if the expression is resolved, recursively.
/// </summary>
public void CheckResolved()
{
TracingHelper.Check(_type != ExpressionType.DatabaseColumn || tFilter != null,
TracingHelper.COLUMN_NOT_FOUND, sColumn);
if (eArg != null)
{
eArg.CheckResolved();
}
if (eArg2 != null)
{
eArg2.CheckResolved();
}
if (sSelect != null)
{
sSelect.CheckResolved();
}
if (fFunction != null)
{
fFunction.CheckResolved();
}
}
private Node Search(object[] d)
{
Node x = _root;
while (x != null)
{
if (TracingHelper.StopEnabled)
{
TracingHelper.Stop();
}
int c = CompareRow(d, x.GetData());
if (c == 0)
{
return(x);
}
else if (c < 0)
{
x = x.GetLeft();
}
else
{
x = x.GetRight();
}
}
return(null);
}
/// <summary>
/// Close the transaction log file.
/// </summary>
private void CloseScript()
{
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write();
}
try
{
if (wScript != null)
{
Stop();
wScript.Close();
wScript = null;
_file = null;
}
}
catch (Exception e)
{
LogHelper.Publish("Unexpected error on CloseScript.", e);
TracingHelper.Error(TracingHelper.FILE_IO_ERROR, sFileScript);
}
}
/// <summary>
/// GetRight method declaration.
/// This GetRight method takes a string argument of the name of the access right.
/// </summary>
/// <param name="right">A string representation of the right.</param>
/// <returns>A static int representing the string right passed in.</returns>
public static AccessType GetRight(string right)
{
if (right.Equals("ALL"))
{
return(AccessType.All);
}
else if (right.Equals("SELECT"))
{
return(AccessType.Select);
}
else if (right.Equals("UPDATE"))
{
return(AccessType.Update);
}
else if (right.Equals("DELETE"))
{
return(AccessType.Delete);
}
else if (right.Equals("INSERT"))
{
return(AccessType.Insert);
}
throw TracingHelper.Error(TracingHelper.UnexpectedToken, right);
}
/// <summary>
/// Save database properties.
/// </summary>
private void SaveProperties()
{
lock ( SyncLock )
{
//WATYF:
//Added check for ".new" file, delete if exists.
//Changed writer creation to include ".new" suffix on sFileProperties
FileInfo fi = new FileInfo(sFileProperties + ".new");
if (fi.Exists)
{
fi.Delete();
}
XmlTextWriter writer = new XmlTextWriter(sFileProperties + ".new", null);
writer.Formatting = Formatting.Indented;
writer.Indentation = 4;
writer.WriteStartDocument();
writer.WriteComment("SharpHSQL Configuration");
writer.WriteProcessingInstruction("Instruction", "Configuration Record");
writer.WriteStartElement("Properties", "");
writer.WriteStartAttribute("LogFile", "");
writer.WriteString(sFileScript);
writer.WriteEndAttribute();
writer.WriteStartAttribute("DataFile", "");
writer.WriteString(sFileCache);
writer.WriteEndAttribute();
writer.WriteStartAttribute("Backup", "");
writer.WriteString(sFileBackup);
writer.WriteEndAttribute();
writer.WriteStartAttribute("Version", "");
writer.WriteString(sVersion);
writer.WriteEndAttribute();
writer.WriteStartAttribute("ReadOnly", "");
if (bReadOnly == true)
{
writer.WriteString("true");
}
else
{
writer.WriteString("false");
}
writer.WriteEndAttribute();
writer.WriteStartAttribute("Modified", "");
writer.WriteString(sModified);
writer.WriteEndElement();
writer.WriteEndDocument();
writer.Flush();
writer.Close();
//WATYF: Added RenameNewToCurrent
RenameNewToCurrent(sFileProperties);
CloseProperties();
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write();
}
}
}
/// <summary>
/// Opens the transaction log for writing.
/// </summary>
private void OpenScript()
{
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write();
}
try
{
// opens the log file exclusively for writing
_file = new FileStream(sFileScript, FileMode.Append, FileAccess.Write, FileShare.None);
// todo: use a compressed stream
wScript = new StreamWriter(_file, System.Text.Encoding.UTF8);
#if !POCKETPC
tRunner = new Thread(new ThreadStart(Run));
tRunner.IsBackground = true;
tRunner.Start();
#endif
}
catch (Exception e)
{
LogHelper.Publish("Unexpected error on OpenScript.", e);
TracingHelper.Error(TracingHelper.FILE_IO_ERROR, sFileScript);
}
}
/// <summary>
/// Checks if the database is already open.
/// </summary>
/// <returns>True if the databse file is open.</returns>
private bool IsAlreadyOpen()
{
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write();
}
FileStream fs = null;
try
{
// try to open the log file exclusively for writing
fs = new FileStream(sFileScript, FileMode.Append, FileAccess.Write, FileShare.None);
}
catch (Exception)
{
return(true);
}
finally
{
if (fs != null)
{
fs.Close();
fs = null;
}
}
return(false);
}
/// <summary>
/// Load properties from file.
/// </summary>
private void LoadProperties()
{
try
{
XmlTextReader reader = new XmlTextReader(sFileProperties);
//Read the tokens from the reader
while (reader.Read())
{
if (XmlNodeType.Element == reader.NodeType)
{
sFileScript = reader.GetAttribute("LogFile");
sFileCache = reader.GetAttribute("DataFile");
sFileBackup = reader.GetAttribute("Backup");
sModified = reader.GetAttribute("Modified");
sVersion = reader.GetAttribute("Version");
bReadOnly = reader.GetAttribute("ReadOnly").ToLower().Equals("true");
}
}
reader.Close();
}
catch (Exception e)
{
Console.WriteLine("Property File Exeception:", e.ToString());
}
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write();
}
}
private static int GetElapsed(string part, DateTime d1, DateTime d2)
{
TimeSpan elapsed = d1.Subtract(d2);
switch (part)
{
case "year":
return(new DateTime(elapsed.Ticks).Year);
case "month":
return(new DateTime(elapsed.Ticks).Month);
case "day":
return(new DateTime(elapsed.Ticks).Day);
case "hour":
return(new DateTime(elapsed.Ticks).Hour);
case "minute":
return(new DateTime(elapsed.Ticks).Minute);
case "second":
return(new DateTime(elapsed.Ticks).Second);
case "ms":
return(new DateTime(elapsed.Ticks).Millisecond);
default:
throw TracingHelper.Error(TracingHelper.ERROR_IN_FUNCTION);
}
}
/// <summary>
/// Multiply two objects.
/// </summary>
/// <param name="one"></param>
/// <param name="two"></param>
/// <param name="type"></param>
/// <returns></returns>
internal static object Multiply(object one, object two, ColumnType type)
{
if (one == null || two == null)
{
return(null);
}
switch (type)
{
case ColumnType.Null:
return(null);
case ColumnType.Integer:
int ai = (int)one;
int bi = (int)two;
return(ai * bi);
case ColumnType.Float:
case ColumnType.Real:
float floata = (float)one;
float floatb = (float)two;
return(floata * floatb);
case ColumnType.DbDouble:
double ad = (double)one;
double bd = (double)two;
return(ad * bd);
case ColumnType.Numeric:
case ColumnType.DbDecimal:
decimal abd = (decimal)one;
decimal bbd = (decimal)two;
return(abd * bbd);
case ColumnType.TinyInt:
byte ba = (byte)one;
byte bb = (byte)two;
return(ba * bb);
case ColumnType.SmallInt:
short shorta = (short)one;
short shortb = (short)two;
return(shorta * shortb);
case ColumnType.BigInt:
long longa = (long)one;
long longb = (long)two;
return(longa * longb);
default:
throw TracingHelper.Error(TracingHelper.FUNCTION_NOT_SUPPORTED, (int)type);
}
}
public void CreatePrimaryKey()
{
TracingHelper.Assert(iPrimaryKey == -1, "Table.createPrimaryKey");
AddColumn("SYSTEM_ID", ColumnType.Integer, true, true);
CreatePrimaryKey(iColumnCount - 1);
iVisibleColumns = iColumnCount - 1;
}
/// <summary>
/// Sets the auto commit mode for this channel.
/// </summary>
/// <param name="autoCommit"></param>
public void SetAutoCommit(bool autoCommit)
{
TracingHelper.Check(!_closed, TracingHelper.CONNECTION_IS_CLOSED);
Commit();
_autoCommit = autoCommit;
}
private Result ProcessDrop(Tokenizer tokenizer, Channel channel)
{
channel.CheckReadWrite();
channel.CheckAdmin();
string sToken = tokenizer.GetString();
if (sToken.Equals("TABLE"))
{
sToken = tokenizer.GetString();
if (sToken.Equals("IF"))
{
sToken = tokenizer.GetString(); // EXISTS
sToken = tokenizer.GetString(); // <table>
DropTable(sToken, true);
}
else
{
DropTable(sToken, false);
}
channel.Commit();
}
else if (sToken.Equals("USER"))
{
_access.DropUser(tokenizer.GetStringToken());
}
else if (sToken.Equals("INDEX"))
{
sToken = tokenizer.GetString();
if (!tokenizer.WasLongName)
{
throw TracingHelper.Error(TracingHelper.UnexpectedToken, sToken);
}
string table = tokenizer.LongNameFirst;
string index = tokenizer.LongNameLast;
Table t = GetTable(table, channel);
t.CheckDropIndex(index);
Table tn = t.MoveDefinition(index);
tn.MoveData(t);
DropTable(table);
LinkTable(tn);
channel.Commit();
}
else
{
throw TracingHelper.Error(TracingHelper.UnexpectedToken, sToken);
}
return(new Result());
}
public object[] GetData()
{
if (TracingHelper.AssertEnabled)
{
TracingHelper.Assert(iBalance != -2);
}
return(rData.GetData());
}
public void GetThis(string match)
{
GetToken();
if (!sToken.Equals(match))
{
throw TracingHelper.Error(TracingHelper.UnexpectedToken, sToken);
}
}
/// <summary>
/// CleanUp method declaration.
/// This method cleans up the cache when it grows too large. It works by
/// checking Rows in held in the Cache's iLastAccess member and removing
/// Rows that haven't been accessed in the longest time.
/// </summary>
public void CleanUp()
{
if (_cacheSize < MAX_CACHE_SIZE)
{
return;
}
int count = 0, j = 0;
while (j++ < LENGTH && _cacheSize + LENGTH > MAX_CACHE_SIZE &&
(count * 16) < LENGTH)
{
if (TracingHelper.StopEnabled)
{
TracingHelper.Stop();
}
Row r = GetWorst();
if (r == null)
{
return;
}
if (r.Changed)
{
_rowWriter[count++] = r;
}
else
{
// here we can't remove roots
if (!r.CanRemove())
{
Remove(r);
}
}
}
if (count != 0)
{
SaveSorted(count);
}
for (int i = 0; i < count; i++)
{
// here we can't remove roots
Row r = _rowWriter[i];
if (!r.CanRemove())
{
Remove(r);
}
_rowWriter[i] = null;
}
}
private Result ProcessGrantOrRevoke(Tokenizer c, Channel channel, bool grant)
{
channel.CheckReadWrite();
channel.CheckAdmin();
AccessType right = AccessType.None;
string sToken;
do
{
string sRight = c.GetString();
right |= Access.GetRight(sRight);
sToken = c.GetString();
} while (sToken.Equals(","));
if (!sToken.Equals("ON"))
{
throw TracingHelper.Error(TracingHelper.UnexpectedToken, sToken);
}
string table = c.GetString();
if (table.Equals("CLASS"))
{
// object is saved as 'CLASS "java.lang.Math"'
// tables like 'CLASS "xy"' should not be created
table += " \"" + c.GetString() + "\"";
}
else
{
GetTable(table, channel); // to make sure the table exists
}
c.GetThis("TO");
string user = c.GetStringToken();
// string command;
if (grant)
{
_access.Grant(user, table, right);
// command = "GRANT";
}
else
{
_access.Revoke(user, table, right);
// command = "REVOKE";
}
return(new Result());
}
/// <summary>
/// Close the transaction log.
/// </summary>
/// <param name="compact"></param>
public void Close(bool compact)
{
lock ( SyncLock )
{
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write();
}
if (bReadOnly)
{
return;
}
// no more scripting
CloseScript();
// create '.script.new' (for this the cache may be still required)
WriteScript(compact);
// flush the cache (important: after writing the script)
cCache.Flush();
// create '.backup.new' using the '.data'
Backup();
// we have the new files
sModified = "yes-new-files";
SaveProperties();
// old files can be removed and new files renamed
RenameNewToCurrent(sFileScript);
RenameNewToCurrent(sFileBackup);
// now its done completely
sModified = "no";
SaveProperties();
CloseProperties();
if (compact)
{
// stop the runner thread of this process (just for security)
Stop();
// delete the .data so then a new file is created
(new FileInfo(sFileCache)).Delete();
(new FileInfo(sFileBackup)).Delete();
// all files are closed now; simply open & close this database
Database db = new Database(sName);
db.Log.Close(false);
}
}
}
public string GetName()
{
GetToken();
if (!WasName)
{
throw TracingHelper.Error(TracingHelper.UnexpectedToken, sToken);
}
return(sToken);
}
public int GetColumnNumber(string c)
{
int i = SearchColumn(c);
if (i == -1)
{
throw TracingHelper.Error(TracingHelper.COLUMN_NOT_FOUND, c);
}
return(i);
}
public int GetBalance()
{
if (TracingHelper.AssertEnabled)
{
TracingHelper.Assert(iBalance != -2);
// rData.iLastAccess=Row.iCurrentAccess++;
}
return(iBalance);
}
/// <summary>
/// Shutdown method declaration.
/// The shutdown method closes the cache file.
/// It does not flush pending writes.
/// </summary>
public void Shutdown()
{
try
{
_fileStream.Close();
}
catch (Exception e)
{
throw TracingHelper.Error(TracingHelper.FILE_IO_ERROR, "error " + e + " in shutdown " + _name);
}
}
