Struct polkadot_node_subsystem_util::database::DBTransaction

pub struct DBTransaction {
    pub ops: Vec<DBOp, Global>,
}

Write transaction. Batches a sequence of put/delete operations for efficiency.

Fields

ops: Vec<DBOp, Global>

Database operations.

Implementations

impl DBTransaction

pub fn new() -> DBTransaction

Create new transaction.

pub fn with_capacity(cap: usize) -> DBTransaction

Create new transaction with capacity.

pub fn put(&mut self, col: u32, key: &[u8], value: &[u8])

Insert a key-value pair in the transaction. Any existing value will be overwritten upon write.

pub fn put_vec(&mut self, col: u32, key: &[u8], value: Vec<u8, Global>)

Insert a key-value pair in the transaction. Any existing value will be overwritten upon write.

pub fn delete(&mut self, col: u32, key: &[u8])

Delete value by key.

pub fn delete_prefix(&mut self, col: u32, prefix: &[u8])

Delete all values with the given key prefix. Using an empty prefix here will remove all keys (all keys start with the empty prefix).

Trait Implementations

impl Clone for DBTransaction

fn clone(&self) -> DBTransaction

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for DBTransaction

fn default() -> DBTransaction

Returns the “default value” for a type.

impl PartialEq<DBTransaction> for DBTransaction

fn eq(&self, other: &DBTransaction) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for DBTransaction