Struct scylla_cql::frame::value::CqlDecimal

pub struct CqlDecimal { /* private fields */ }

Native CQL decimal representation.

Represented as a pair:

• a CqlVarint value
• 32-bit integer which determines the position of the decimal point

The type is not very useful in most use cases. However, users can make use of more complex types such as bigdecimal::BigDecimal (v0.4). The library support (e.g. conversion from CqlValue) for the type is enabled via bigdecimal-04 crate feature.

DB data format

Notice that constructors don’t perform any normalization on the provided data. For more details, see CqlVarint documentation.

Implementations

impl CqlDecimal

Constructors

pub fn from_signed_be_bytes_and_exponent(bytes: Vec<u8>, scale: i32) -> Self

Creates a CqlDecimal from an array of bytes representing CqlVarint and a 32-bit scale.

See: disclaimer about non-normalized values.

pub fn from_signed_be_bytes_slice_and_exponent(bytes: &[u8], scale: i32) -> Self

Creates a CqlDecimal from a slice of bytes representing CqlVarint and a 32-bit scale.

See: disclaimer about non-normalized values.

impl CqlDecimal

Conversion to raw bytes

pub fn as_signed_be_bytes_slice_and_exponent(&self) -> (&[u8], i32)

Returns a slice of bytes in two’s complement binary big-endian representation and a scale.

pub fn into_signed_be_bytes_and_exponent(self) -> (Vec<u8>, i32)

Converts CqlDecimal to an array of bytes in two’s complement binary big-endian representation and a scale.

Trait Implementations

impl Clone for CqlDecimal

fn clone(&self) -> CqlDecimal

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CqlDecimal

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

Formats the value using the given formatter.

impl<'frame, 'metadata> DeserializeValue<'frame, 'metadata> for CqlDecimal

fn type_check(typ: &ColumnType<'_>) -> Result<(), TypeCheckError>

Checks that the column type matches what this type expects.

fn deserialize( typ: &'metadata ColumnType<'metadata>, v: Option<FrameSlice<'frame>>, ) -> Result<Self, DeserializationError>

Deserialize a column value from given serialized representation.

impl FromCqlVal<CqlValue> for CqlDecimal

fn from_cql(cql_val: CqlValue) -> Result<CqlDecimal, FromCqlValError>

👎Deprecated since 0.15.0: Legacy deserialization API is inefficient and is going to be removed soon

impl PartialEq for CqlDecimal

fn eq(&self, other: &CqlDecimal) -> 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 SerializeValue for CqlDecimal

fn serialize<'b>( &self, typ: &ColumnType<'_>, writer: CellWriter<'b>, ) -> Result<WrittenCellProof<'b>, SerializationError>

Serializes the value to given CQL type.

impl Value for CqlDecimal

fn serialize(&self, buf: &mut Vec<u8>) -> Result<(), ValueTooBig>

👎Deprecated since 0.15.1: Legacy serialization API is not type-safe and is going to be removed soon

impl Emptiable for CqlDecimal

impl Eq for CqlDecimal

impl StructuralPartialEq for CqlDecimal