Struct fdb::tuple::Tuple

pub struct Tuple { /* private fields */ }

Represents a set of elements that make up a sortable, typed key.

Tuple is comparable with other Tuples and will sort in Rust in the same order in which they would sort in FDB. Tuples sort first by the first element, then by the second, etc., This make tuple layer ideal for building a variety of higher-level data models.

For general guidance on tuple usage, see this link.

Tuple can contain null, Bytes, String, another Tuple, BigInt, i64, i32, i16, i8, f32, f64, bool, Uuid, Versionstamp values.

Implementations

impl Tuple

pub fn new() -> Tuple

Create a new empty Tuple.

pub fn from_bytes(b: impl Into<Bytes>) -> FdbResult<Tuple>

Construct a new Tuple with elements decoded from a supplied Bytes.

pub fn add_null(&mut self)

Append FDB Tuple null value to Tuple.

pub fn add_bytes(&mut self, b: Bytes)

Append Bytes value to the Tuple.

pub fn add_string(&mut self, s: String)

Append String value to the Tuple.

pub fn add_tuple(&mut self, t: Tuple)

Append Tuple value to the Tuple

pub fn add_bigint(&mut self, i: BigInt)

Append BigInt value to the Tuple

Panic

Panics if the Bytes encoded length of the BigInt is greater than 255.

pub fn add_i64(&mut self, i: i64)

Append i64 value to the Tuple

pub fn add_i32(&mut self, i: i32)

Append i32 value to the Tuple

pub fn add_i16(&mut self, i: i16)

Append i16 value to the Tuple.

pub fn add_i8(&mut self, i: i8)

Append i8 value to the Tuple.

pub fn add_f32(&mut self, f: f32)

Append f32 value to the Tuple.

Note

The f32 value is encoded using type code 0x20, without any conversion.

pub fn add_f64(&mut self, f: f64)

Append f64 value to the Tuple.

Note

The f64 value is encoded using type code 0x21, without any conversion.

pub fn add_bool(&mut self, b: bool)

Append bool value to the Tuple.

pub fn add_uuid(&mut self, u: Uuid)

Append Uuid value to the Tuple.

pub fn add_versionstamp(&mut self, v: Versionstamp)

Append Versionstamp value to the Tuple

pub fn append(&mut self, t: Tuple)

Append elements of Tuple t to Tuple Self

pub fn has_incomplete_versionstamp(&self) -> bool

Determines if there is a Versionstamp included in this Tuple that has not had its transaction version set.

pub fn get_null(&self, index: usize) -> FdbResult<()>

Gets an indexed item as FDB Tuple null value.

pub fn get_bytes_ref(&self, index: usize) -> FdbResult<&Bytes>

Gets an indexed item as Bytes ref.

pub fn get_string_ref(&self, index: usize) -> FdbResult<&String>

Gets an indexed item as String ref.

pub fn get_tuple_ref(&self, index: usize) -> FdbResult<&Tuple>

Gets an indexed item as Tuple ref.

pub fn get_bigint(&self, index: usize) -> FdbResult<BigInt>

Gets an indexed item as BigInt.

pub fn get_i64(&self, index: usize) -> FdbResult<i64>

Gets an indexed item as i64.

pub fn get_i32(&self, index: usize) -> FdbResult<i32>

Gets an indexed item as i32.

pub fn get_i16(&self, index: usize) -> FdbResult<i16>

Gets an indexed item as i16.

pub fn get_i8(&self, index: usize) -> FdbResult<i8>

Gets an indexed item as i8.

pub fn get_f32(&self, index: usize) -> FdbResult<f32>

Gets an indexed item as f32.

pub fn get_f64(&self, index: usize) -> FdbResult<f64>

Gets an indexed item as f64.

pub fn get_bool(&self, index: usize) -> FdbResult<bool>

Gets an indexed item as bool.

pub fn get_uuid_ref(&self, index: usize) -> FdbResult<&Uuid>

Gets an indexed item as Uuid ref.

pub fn get_versionstamp_ref(&self, index: usize) -> FdbResult<&Versionstamp>

Gets an indexed item as Versionstamp ref.

pub fn is_empty(&self) -> bool

Determine if this Tuple contains no elements.

pub fn size(&self) -> usize

Gets the number of elements in this Tuple.

pub fn pack(&self) -> Bytes

Get an encoded representation of this Tuple.

pub fn pack_with_versionstamp(&self, prefix: Bytes) -> FdbResult<Bytes>

Get an encoded representation of this Tuple for use with SetVersionstampedKey.

Panic

The index where incomplete versionstamp is located is a 32-bit little-endian integer. If the generated index overflows u32, then this function panics.

pub fn range(&self, prefix: Bytes) -> Range

Returns a range representing all keys that encode Tuples strictly starting with this Tuple.

Panic

Panics if the tuple contains an incomplete Versionstamp.

Trait Implementations

impl Clone for Tuple

fn clone(&self) -> Tuple

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Tuple

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Tuple

fn default() -> Tuple

Returns the “default value” for a type.

impl Ord for Tuple

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<Tuple> for Tuple

fn eq(&self, other: &Self) -> 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 !=.

impl PartialOrd<Tuple> for Tuple

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Tuple