Trait redb::ReadableTable
source · [−]pub trait ReadableTable<K: RedbKey + ?Sized, V: RedbValue + ?Sized> {
fn get(
&self,
key: &K
) -> Result<Option<<<V as RedbValue>::View as WithLifetime<'_>>::Out>, Error>;
fn range<'a, T: RangeBounds<KR>, KR: Borrow<K> + 'a>(
&'a self,
range: T
) -> Result<RangeIter<'_, K, V>, Error>;
fn len(&self) -> Result<usize, Error>;
fn is_empty(&self) -> Result<bool, Error>;
}Required Methods
Returns the value corresponding to the given key
Returns a double-ended iterator over a range of elements in the table
Examples
Usage:
use redb::*;
const TABLE: TableDefinition<str, u64> = TableDefinition::new("my_data");
let db = unsafe { Database::create(filename, db_max_size)? };
let write_txn = db.begin_write()?;
{
let mut table = write_txn.open_table(TABLE)?;
table.insert("a", &0)?;
table.insert("b", &1)?;
table.insert("c", &2)?;
}
write_txn.commit()?;
let read_txn = db.begin_read()?;
let table = read_txn.open_table(TABLE)?;
let mut iter = table.range("a".."c")?;
assert_eq!(Some(("a", 0)), iter.next());