public void Load(EasyServer server, bool recover, long recoveryPoint)
{
long filesize = stream.Length;
long inTransaction = -1;
long prevPos = 0;
long oldSize = 0;
long startPosition = 0;
try
{
while (filesize > 0)
{
startPosition = stream.Position;
uint tableId = reader.ReadUInt32();
EasyTable table = null;
#region Deleted row OR Transaction Atomicity
if (tableId == 0)
{
uint sz = reader.ReadUInt32();
filesize -= sz;
prevPos = 0;
reader.ReadBytes((int)sz - 8);
continue;
}
else if (tableId == TRANSTART)
{
if (recover && recoveryPoint > -1 && recoveryPoint == startPosition)
{
//actual recovery
//TODO: truncate file :) maybr seek -1
return;
}
if (inTransaction > -1)
{
if (!recover)
{
throw new Exception(RECOVERMSG);
}
else
{
throw new RecoverException();
}
}
inTransaction = startPosition;
continue;
}
else if (tableId == TRANEND)
{
if (inTransaction == -1)
{
if (!recover)
{
throw new Exception(RECOVERMSG);
}
else
{
throw new RecoverException();
}
}
else
{
inTransaction = -1; //everyting is ok.
}
continue;
}
#endregion
table = server.FindTable(tableId);
uint size = reader.ReadUInt32();
filesize -= size;
#region Row size control
if (prevPos != 0)
{
if (stream.Position - prevPos != oldSize)
{
throw new Exception("Corrupt Internal Error");
}
}
prevPos = stream.Position;
oldSize = size;
#endregion
table.RowColumn.Insert(stream.Position - 8);
#region Read Value
while ((stream.Position - startPosition) < size)
{
uint columnId = reader.ReadUInt32();
EasyBaseColumn column = table.FindColumn(columnId);
if (column is EasyUIntColumn)
{
column.Insert(reader.ReadUInt32());
}
else if (column is EasyIntColumn)
{
column.Insert(reader.ReadInt32());
}
else if (column is EasyStringColumn)
{
column.Insert(reader.ReadString());
}
else if (column is EasyDecimalColumn)
{
column.Insert(reader.ReadDecimal());
}
else if (column is EasyBoolColumn)
{
column.Insert(reader.ReadDecimal());
}
}
#endregion
#region if row does not include all columns, complete the others
/* Insert or update cannot gueranty to supply data for all columns.
* Because table can altered at any time. (Alter table add column)
*/
int rowCount = table.RowColumn.GetRowCount();
foreach (EasyBaseColumn column in table.Columns)
{
if (column.GetRowCount() < rowCount)
{
column.Insert(null);
}
column.SetIdentity();
}
#endregion
if (table.Id == 1) //'tables' table
{
server.CreateTableFromSchema();
}
//TODO: if this is a column and table is already created then add this new column
}
}
catch (RecoverException rexp)
{
if (!recover)
{
throw;
}
this.CloseFile();
Load(server, true, inTransaction);
}
}
