public void WriteNode()
{
if (Block == null)
{
Block = new Block(MemoryManager, IndexRelation);
Block.Page = new Pointer(Page.PageNumber, 0);
}
foreach (BPlusTreeNodeValue value in Values)
{
CustomTuple tuple = new CustomTuple(IndexRelation);
tuple.AddValueFor <TKeyType>("Value", (TKeyType)value.Value);
if (IsLeaf && value == Values.First() && LeftSiblingPointer != null)
{
tuple.AddValueFor("LeftPointer", LeftSiblingPointer.Short);
}
else
{
if (value.LeftPointer != null)
{
tuple.AddValueFor("LeftPointer", value.LeftPointer.Short);
}
else
{
tuple.AddValueFor("LeftPointer", (uint)0);
}
}
if (value.Pointer != null)
{
tuple.AddValueFor("ValuePointer", value.Pointer.Short);
}
else
{
tuple.AddValueFor("ValuePointer", (uint)0);
}
if (IsLeaf && value == Values.Last() && RightSiblingPointer != null)
{
tuple.AddValueFor("RightPointer", RightSiblingPointer.Short);
}
else
{
if (value.RightPointer != null)
{
tuple.AddValueFor("RightPointer", value.RightPointer.Short);
}
else
{
tuple.AddValueFor("RightPointer", (uint)0);
}
}
Block.AddRecord(tuple.ToRecord());
}
MemoryManager.Persist(Block);
}
public (IBPlusTreeNode, int) FindNodeForCondition(LeafCondition condition, bool first)
{
if (IsLeaf)
{
//CustomValueComparer comparer = Comparers.GetComparer(condition.Column.Type);
// todo: if column not in index, fetch data
if (first)
{
for (int i = 0; i < Values.Count; i++)
{
CustomTuple tuple = new CustomTuple(DataRelation);
tuple.AddValueFor(condition.Column.Name, (int)Values[i].Value);
if (condition.SatisfiesCondition(tuple))
{
return(this, i);
}
}
}
else
{
for (int i = Values.Count - 1; i >= 0; i--)
{
CustomTuple tuple = new CustomTuple(DataRelation);
tuple.AddValueFor(condition.Column.Name, (int)Values[i].Value);
if (condition.SatisfiesCondition(tuple))
{
return(this, i);
}
}
}
return(null, -1);
}
else
{
// todo: if GreaterThan, get right pointer
Pointer target = GetTargetPointer((TKeyType)condition.Value);
BPlusTreeNode <TKeyType> node = ReadNode(target);
return(node.FindNodeForCondition(condition, first));
}
}
