public Index(string nm, ushort kl, DateTime udTime)
{
int sz = DataFile.GetSize(Root);
if (DataFile.Exists(nm, "Index"))
{
File = DataFile.Open(nm, "Index", FileMode.Open);
File.Read(Root, DataFile.coSignatureSz, sz);
if (DateTime.Compare(Root.LastUpdate, udTime) >= 0 && Root.Closed)
{
Root.Closed = false;
File.Lock(Root);
File.Write(Root);
return;
}
File.Close();
DataFile.Delete(nm, "Index");
}
File = DataFile.Open(nm, "Index", FileMode.CreateNew);
DataFile.Blank(Root, sz);
Root.KeyLength = kl;
Root.Closed = false;
Root.PageSize = (ushort)DataFile.GetSize(new IdxPage(0, 0, 0, kl));
File.Append(Root, sz);
File.Lock(Root);
}
internal static void Create(string nm, Table obj)
{
TableFile db;
if (OpenList.TryGetValue(nm, out db))
{
throw new System.InvalidOperationException("MinBase: Cannot create table " + nm + " because there is a perviously open table with the same name.");
}
db = new TableFile();
Struct stt = new Struct();
db.File = DataFile.Open(nm, "Table", FileMode.CreateNew);
stt.RowLength = DataFile.GetSize(obj);
stt.RowCount = 0;
db.File.Append(stt, DataFile.GetSize(stt));
db.File.Close();
}
internal static void Open(string nm, Table obj, mpIndexKey gkey, string xn)
{
TableFile db;
SyncOpen.WaitOne();
if (OpenList.TryGetValue(nm, out db))
{
db.OpenCount++;
}
else
{
db = new TableFile();
db.Alias = nm;
db.File = DataFile.Open(nm, "Table", FileMode.Open);
db.Struct = new Struct();
int sz = DataFile.GetSize(db.Struct);
db.File.Read(db.Struct, DataFile.coSignatureSz, sz);
db.File.Lock(db.Struct);
db.OpenCount = 1;
db.Data = DataFile.coSignatureSz + sz;
long cz = db.Data + db.Struct.RowLength * db.Struct.RowCount;
long fz = db.File.LoFile.Length;
if (cz != fz)
{
db.Struct.LastUpdate = DateTime.Now;
db.File.Write(db.Struct);
db.File.CopyTo(String.Format("{0}{1:yyyy}{1:MM}{1:dd}{1:HH}{1:mm}{1:ss}", nm, db.Struct.LastUpdate), "BackupTable");
db.File.LoFile.SetLength(cz);
}
OpenList.Add(nm, db);
}
SyncOpen.ReleaseMutex();
obj.LoTable = db;
if (gkey == null)
{
obj.Order = null;
}
else
{
obj.Order = db.SetView(obj, xn, gkey);
}
obj.First();
}