// Basic read/write functions ( indexes not updated ).
// Get fetchs the row identified by id from the file buffer into the Value array.
// cols specifies a subset of the columns to be fetched ( as an optimisation ). If not important, use AllCols.
public override bool Get(long id, Value[] row, int [] cols)
{
if (id <= 0 || id > RowCount)
{
return(false);
}
DataFile.Position = (id - 1) * RowSize;
int ix; byte [] RowBuffer = DataFile.FastRead(RowSize, out ix);
if (RowBuffer[ix++] == 0)
{
return(false); // Row has been deleted
}
row[0].L = id;
for (int c = 0; c < cols.Length; c += 1)
{
int col = cols[c];
DataType t = CI.Type[col];
long x = Util.Get(RowBuffer, ix + Offset[col], Size[col], t);
row[col].L = x;
if (t <= DataType.String)
{
row[col]._O = Database.Decode(x, t);
}
}
return(true);
}
public override bool Get(long id, Value[] row, bool [] used)
{
if (id <= 0 || id > RowCount)
{
return(false);
}
DF.Position = (id - 1) * RowSize;
int ix; byte [] RB = DF.FastRead(RowSize, out ix);
if (RB[ix++] == 0)
{
return(false); // Row has been deleted
}
row[0].L = id;
DataType [] types = Cols.Types;
byte [] sizes = Cols.Sizes;
for (int i = 1; i < types.Length; i += 1)
{
int size = sizes[i];
if (used == null || used [i]) // Column not skipped
{
DataType t = types[i];
long x = (long)Util.Get(RB, ix, size, t);
row[i].L = x;
if (t <= DataType.String)
{
row[i]._O =
t == DataType.Binary ? (object)Db.DecodeBinary(x): (object)Db.DecodeString(x);
}
}
ix += size;
}
return(true);
}