/// <summary>
/// Upgrade old version of LiteDB into new LiteDB file structure. Returns true if database was completed converted
/// If database already in current version just return false
/// </summary>
public static bool Upgrade(string filename, string password = null, Collation collation = null)
{
if (filename.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(filename));
}
if (!File.Exists(filename))
{
return(false);
}
var settings = new EngineSettings
{
Filename = filename,
Password = password,
Collation = collation
};
var backup = FileHelper.GetSufixFile(filename, "-backup", true);
settings.Filename = FileHelper.GetSufixFile(filename, "-temp", true);
var buffer = new byte[PAGE_SIZE * 2];
IFileReader reader;
using (var stream = new FileStream(filename, FileMode.Open, FileAccess.Read))
{
// read first 16k
stream.Read(buffer, 0, buffer.Length);
// checks if v8 plain data or encrypted (first byte = 1)
if ((Encoding.UTF8.GetString(buffer, HeaderPage.P_HEADER_INFO, HeaderPage.HEADER_INFO.Length) == HeaderPage.HEADER_INFO &&
buffer[HeaderPage.P_FILE_VERSION] == HeaderPage.FILE_VERSION) ||
buffer[0] == 1)
{
return(false);
}
// checks if v7 (plain or encrypted)
if (Encoding.UTF8.GetString(buffer, 25, HeaderPage.HEADER_INFO.Length) == HeaderPage.HEADER_INFO &&
buffer[52] == 7)
{
reader = new FileReaderV7(stream, password);
}
else
{
throw new LiteException(0, "Invalid data file format to upgrade");
}
using (var engine = new LiteEngine(settings))
{
engine.RebuildContent(reader);
// after rebuild, copy log bytes into data file
engine.Checkpoint();
// re-enable auto-checkpoint pragma
engine.Pragma(Pragmas.CHECKPOINT, 1000);
// copy userVersion from old datafile
engine.Pragma("USER_VERSION", (reader as FileReaderV7).UserVersion);
}
}
// rename source filename to backup name
File.Move(filename, backup);
// rename temp file into filename
File.Move(settings.Filename, filename);
return(true);
}
/// <summary>
/// Upgrade old version of LiteDB into new LiteDB file structure. Returns true if database was completed converted
/// </summary>
public static bool Upgrade(string filename, string password = null)
{
if (filename.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(filename));
}
if (!File.Exists(filename))
{
return(false);
}
var settings = new EngineSettings
{
Filename = filename,
Password = password
};
var backup = FileHelper.GetSufixFile(filename, "-backup", true);
settings.Filename = FileHelper.GetSufixFile(filename, "-temp", true);
var buffer = new byte[PAGE_SIZE * 2];
IFileReader reader;
using (var stream = new FileStream(filename, FileMode.Open, FileAccess.Read))
{
// read first 16k
stream.Read(buffer, 0, buffer.Length);
// checks if v8 plain data or encrypted (first byte = 1)
if ((Encoding.UTF8.GetString(buffer, HeaderPage.P_HEADER_INFO, HeaderPage.HEADER_INFO.Length) == HeaderPage.HEADER_INFO &&
buffer[HeaderPage.P_FILE_VERSION] == HeaderPage.FILE_VERSION) ||
buffer[0] == 1)
{
return(false);
}
// checks if v7 (plain or encrypted)
if (Encoding.UTF8.GetString(buffer, 25, HeaderPage.HEADER_INFO.Length) == HeaderPage.HEADER_INFO &&
buffer[52] == 7)
{
reader = new FileReaderV7(stream, password);
}
else
{
throw new LiteException(0, "Invalid data file format to upgrade");
}
try
{
using (var engine = new LiteEngine(settings))
{
engine.Rebuild(reader);
engine.Checkpoint();
}
}
finally
{
reader.Dispose();
}
}
// rename source filename to backup name
File.Move(filename, backup);
// rename temp file into filename
File.Move(settings.Filename, filename);
return(true);
}