Module sp_io::storage [−][src]
Expand description
Interface for accessing the storage from within the runtime.
Structs
Provides implementations for the extern host functions.
Functions
Append the encoded value to the storage item at key.
“Commit” all existing operations and get the resulting storage change root.
parent_hash is a SCALE encoded hash.
Clear the storage of the given key and its value.
Clear the storage of each key-value pair where the key starts with the given prefix.
Commit the last transaction started by start_transaction.
Check whether the given key exists in storage.
Returns the data for key in the storage or None if the key can not be found.
Get the next key in storage after the given one in lexicographic order.
Get key from storage, placing the value into value_out and return the number of
bytes that the entry in storage has beyond the offset or None if the storage entry
doesn’t exist at all.
If value_out length is smaller than the returned length, only value_out length bytes
are copied into value_out.
Rollback the last transaction started by start_transaction.
“Commit” all existing operations and compute the resulting storage root.
Set key to value in the storage.
Start a new nested transaction.