/// <summary>
/// Upgrade datafile from v6 to new v7 format used in LiteDB 3
/// </summary>
public static bool Upgrade(string filename, string password = null, bool backup = true, int batchSize = 5000)
{
// if not exists, just exit
if (!File.Exists(filename))
{
return(false);
}
// use a temp file to copy/convert data from
var tempFile = FileHelper.GetTempFile(filename);
// open file as stream and test if is V6
using (var stream = new FileStream(filename, System.IO.FileMode.Open, FileAccess.Read))
{
using (IDbReader reader = new LiteDB_V6.DbReader())
{
if (reader.Initialize(stream, password) == false)
{
return(false);
}
// open new datafile to copy data from
using (var engine = new LiteEngine(tempFile, false))
{
foreach (var col in reader.GetCollections())
{
// first, create all unique indexes
foreach (var field in reader.GetUniqueIndexes(col))
{
engine.EnsureIndex(col, field, true);
}
// now bulk copy documents
var docs = reader.GetDocuments(col);
engine.InsertBulk(col, docs, batchSize);
// just clear pages/cache
engine.Rollback();
}
}
}
}
// if backup, move current file to new -bkp
if (backup)
{
File.Move(filename, FileHelper.GetTempFile(filename, "-bkp"));
}
else
{
File.Delete(filename);
}
// move temp file to original filename
File.Move(tempFile, filename);
return(true);
}
/// <summary>
/// Upgrade datafile from v6 to new v7 format used in LiteDB 3
/// </summary>
public static bool Upgrade(string filename, string password = null, bool backup = true, int batchSize = 5000)
{
// if not exists, just exit
if (!File.Exists(filename)) return false;
// use a temp file to copy/convert data from
var tempFile = FileHelper.GetTempFile(filename);
// open fiel as stream and test if is V6
using(var stream = new FileStream(filename, FileMode.Open, FileAccess.Read))
{
IDbReader reader = new LiteDB_V6.DbReader();
if (reader.Initialize(stream, password) == false) return false;
// open new datafile to copy data from
using (var engine = new LiteEngine(tempFile, false))
{
foreach(var col in reader.GetCollections())
{
// first, create all indexes
var indexes = reader.GetIndexes(col);
foreach(var index in indexes)
{
engine.EnsureIndex(col, index.Key, index.Value);
}
// now copy documents in 5000 groups
var docs = reader.GetDocuments(col);
foreach(var batch in docs.Batch(batchSize))
{
engine.Insert(col, batch);
// just clear pages
engine.Rollback();
}
}
}
}
// if backup, move current file to new -bkp
if (backup)
{
File.Move(filename, FileHelper.GetTempFile(filename, "-bkp"));
}
else
{
File.Delete(filename);
}
// move temp file to original filename
File.Move(tempFile, filename);
return true;
}
public bool Rollback()
{
if (_engine == null)
{
return(false);
}
try
{
return(_engine.Rollback());
}
finally
{
this.CloseDatabase();
}
}
