btree

A BTree with a schema of named, Value-typed Column s.

class tinychain.collection.btree.BTree(form=None)

Bases: Collection

A BTree with a schema of named, Value-typed Column s.

count(range=None)

Return the number of keys in this BTree.

To count the number of keys beginning with a specific prefix, call btree[prefix].count().

delete(prefix=None)

Delete the contents of this BTree within the specified range.

If no range is specified, the entire contents of this BTree will be deleted.

first()

Return the first row in this BTree.

If there are no rows, this will raise a NotFoundError.

insert(key)

Insert the given key into this BTree.

If the key is already present, this is a no-op.

reverse()

Return a slice of this BTree with the same range but with its keys in reverse order.

class tinychain.collection.btree.Schema(columns)

Bases: object

A BTree schema which comprises a tuple of Column s.