/// <summary>
/// Shrink datafile
/// </summary>
public void Shrink()
{
var dbFileName = _fileStream.Name;
var fileAccess = _fileStream.CanWrite ? FileAccess.ReadWrite : FileAccess.Read;
var tempFile = Path.GetDirectoryName(dbFileName) + Path.DirectorySeparatorChar + Path.GetFileNameWithoutExtension(dbFileName) + ".temp" + Path.GetExtension(dbFileName);
if (File.Exists(tempFile))
{
File.Delete(tempFile);
}
var entries = ListFiles();
FileDB.CreateEmptyFile(tempFile, false);
using (var tempDb = new FileDB(tempFile, FileAccess.ReadWrite))
{
foreach (var entry in entries)
{
using (var stream = new MemoryStream())
{
Read(entry.ID, stream);
stream.Seek(0, SeekOrigin.Begin);
tempDb.Store(entry, stream);
}
}
}
Dispose();
File.Delete(dbFileName);
File.Move(tempFile, dbFileName);
Connect(dbFileName, fileAccess);
}
private void Connect(string fileName, FileAccess fileAccess)
{
if (!File.Exists(fileName))
{
FileDB.CreateEmptyFile(fileName);
}
// Não permite acesso somente gravação (transforma em leitura/gravação)
var fa = fileAccess == FileAccess.Write || fileAccess == FileAccess.ReadWrite ? FileAccess.ReadWrite : FileAccess.Read;
_fileStream = new FileStream(fileName, FileMode.Open, fa, FileShare.ReadWrite, (int)BasePage.PAGE_SIZE, FileOptions.None);
_engine = new Engine(_fileStream);
}