internal static void Load(IndexRecord record)
{
var varColStartIndex = 0;
LoadIndexType(record);
LoadStatusBits(record);
if (record.HasNullBitmap)
{
LoadNullBitmap(record);
varColStartIndex = 2 + record.NullBitmapSize;
}
if (record.HasVariableLengthColumns)
{
LoadColumnOffsetArray(record, varColStartIndex);
}
record.VariableLengthDataOffset = (ushort)(record.Page.Header.MinLen + sizeof(short) + varColStartIndex + (sizeof(short) * record.VariableLengthColumnCount));
LoadColumnValues(record);
if (record.IsIndexType(IndexTypes.Node) | record.Page.Header.IndexId == 1)
{
LoadDownPagePointer(record);
}
if (record.IsIndexType(IndexTypes.Heap) && (!(record.Structure as IndexStructure).Unique | record.IsIndexType(IndexTypes.Leaf)))
{
LoadRid(record);
}
}
private static void LoadIndexType(IndexRecord record)
{
if (record.Page.Header.IndexId > 0)
{
record.IndexType = record.IndexType | IndexTypes.NonClustered;
}
else
{
record.IndexType = record.IndexType | IndexTypes.Clustered;
}
if (record.Page.Header.Level > 0)
{
record.IndexType = record.IndexType | IndexTypes.Node;
}
else
{
record.IndexType = record.IndexType | IndexTypes.Leaf;
}
if ((record.Structure as IndexStructure).Heap)
{
record.IndexType = record.IndexType | IndexTypes.Heap;
}
else
{
record.IndexType = record.IndexType | IndexTypes.TableClustered;
}
record.IncludeKey = (!(record.Structure as IndexStructure).Unique &&
record.IsIndexType(IndexTypes.NonClustered)) ||
record.IsIndexType(IndexTypes.NonClusteredLeaf);
}
private static void LoadRid(IndexRecord record)
{
int ridOffset;
var ridAddress = new byte[8];
if (record.IsIndexType(IndexTypes.Leaf))
{
ridOffset = record.SlotOffset + record.Page.Header.MinLen - 8;
}
else
{
ridOffset = record.SlotOffset + record.Page.Header.MinLen - 14;
}
Array.Copy(record.Page.PageData, ridOffset, ridAddress, 0, RowIdentifier.Size);
record.Rid = new RowIdentifier(ridAddress);
record.Mark("Rid", ridOffset, RowIdentifier.Size);
}
private static void LoadColumnValues(IndexRecord record)
{
RecordField field;
var columnValues = new List <RecordField>();
var index = 0;
foreach (IndexColumn indexCol in (record.Structure as IndexStructure).Columns)
{
var processKeyColumn = !indexCol.Key || (record.IncludeKey && indexCol.Key);
var processIncludesColumn = !indexCol.IncludedColumn || (indexCol.IncludedColumn && record.IsIndexType(IndexTypes.Leaf));
if (processKeyColumn & processIncludesColumn)
{
field = new RecordField(indexCol);
var length = 0;
var offset = 0;
byte[] data = null;
var variableIndex = 0;
if (indexCol.LeafOffset >= 0)
{
// Fixed length field
offset = indexCol.LeafOffset;
length = indexCol.DataLength;
data = new byte[length];
Array.Copy(record.Page.PageData, indexCol.LeafOffset + record.SlotOffset, data, 0, length);
}
else if (record.HasVariableLengthColumns)
{
//Variable length field
variableIndex = (indexCol.LeafOffset * -1) - 1;
if (variableIndex == 0)
{
offset = record.VariableLengthDataOffset;
}
else
{
offset = record.ColOffsetArray[variableIndex - 1];
}
if (variableIndex >= record.ColOffsetArray.Length)
{
length = 0;
}
else
{
length = record.ColOffsetArray[variableIndex] - offset;
}
data = new byte[length];
Array.Copy(record.Page.PageData, offset + record.SlotOffset, data, 0, length);
}
field.Offset = offset;
field.Length = length;
field.Data = data;
field.VariableOffset = variableIndex;
field.Mark("Value", record.SlotOffset + field.Offset, field.Length);
record.Mark("FieldsArray", field.Name, index);
index++;
columnValues.Add(field);
}
}
record.Fields.AddRange(columnValues);
}
