public void InsertRecord(params object[] fields)
{
long insertLocation;
//Find available spot to place record....
if (_fileHeader.BlocksInFile == 0)
{
var block = RecordBlock.CreateNew(_stream, _schema, 0);
_fileHeader.BlocksInFile++;
WriteFileHeader();
insertLocation = block.Insert(fields);
}
else
{
var lastBlock = RecordBlock.LoadFromStream(_stream, _schema, _fileHeader.BlocksInFile - 1);
if (lastBlock.BlockHeader.FreeBytes > _schema.GetRecordSize())
{
insertLocation = lastBlock.Insert(fields);
}
else
{
var newBlock = RecordBlock.CreateNew(_stream, _schema, _fileHeader.BlocksInFile);
insertLocation = newBlock.Insert(fields);
_fileHeader.BlocksInFile++;
WriteFileHeader();
}
}
_indexManager.AddRecord(fields, insertLocation, _schema);
}
public Record[] Query(Func <Record, bool> query)
{
List <Record> records = new List <Record>();
for (int i = 0; i < this._fileHeader.BlocksInFile; i++)
{
var block = RecordBlock.LoadFromStream(_stream, _schema, i);
records.AddRange(block.Query(query));
}
return(records.ToArray());
}
public Record[] ReadAllRecords()
{
List <Record> records = new List <Record>();
for (int i = 0; i < this._fileHeader.BlocksInFile; i++)
{
var block = RecordBlock.LoadFromStream(_stream, _schema, i);
records.AddRange(block.ReadAll());
}
return(records.ToArray());
}
public Record ReadRecordFromPointer(long pointer)
{
int totalBlockLength = Constants.Lengths.BlockLength + Constants.Lengths.BlockHeaderLength;
long pointerInBody = pointer - Constants.Lengths.FileHeaderLength;
int blockNumber = (int)Math.Floor((decimal)pointerInBody / totalBlockLength);
long remainingBytes = pointerInBody - (blockNumber * totalBlockLength);
long trueIndex = (int)(remainingBytes / _schema.GetRecordSize());
var block = RecordBlock.LoadFromStream(_stream, _schema, blockNumber - 1);
return(block.Read(trueIndex));
}
public Record ReadRecord(long index)
{
long totalIndex = 0;
for (int i = 0; i < this._fileHeader.BlocksInFile; i++)
{
var block = RecordBlock.LoadFromStream(_stream, _schema, i);
//the index is less than the upper bound of this block
if (index < totalIndex + block.BlockHeader.RecordCount)
{
return(block.Read(index - totalIndex));
}
totalIndex += block.BlockHeader.RecordCount;
}
throw new Exception();
}