Enum Value 

pub enum Value {
    Null,
    Boolean(Option<bool>),
    Int8(Option<i8>),
    Int16(Option<i16>),
    Int32(Option<i32>),
    Int64(Option<i64>),
    Int128(Option<i128>),
    UInt8(Option<u8>),
    UInt16(Option<u16>),
    UInt32(Option<u32>),
    UInt64(Option<u64>),
    UInt128(Option<u128>),
    Float32(Option<f32>),
    Float64(Option<f64>),
    Decimal(Option<Decimal>, u8, u8),
    Char(Option<char>),
    Varchar(Option<Cow<'static, str>>),
    Blob(Option<Box<[u8]>>),
    Date(Option<Date>),
    Time(Option<Time>),
    Timestamp(Option<PrimitiveDateTime>),
    TimestampWithTimezone(Option<OffsetDateTime>),
    Interval(Option<Interval>),
    Uuid(Option<Uuid>),
    Array(Option<Box<[Value]>>, Box<Value>, u32),
    List(Option<Vec<Value>>, Box<Value>),
    Map(Option<HashMap<Value, Value>>, Box<Value>, Box<Value>),
    Json(Option<Value>),
    Struct(Option<Vec<(String, Value)>>, Vec<(String, Value)>, TableRef),
    Unknown(Option<String>),
}

SQL value representation.

Variants correspond to database column types.

Variants

Null

SQL NULL.

Boolean(Option<bool>)

Boolean value.

Int8(Option<i8>)

8-bit signed integer.

Int16(Option<i16>)

16-bit signed integer.

Int32(Option<i32>)

32-bit signed integer.

Int64(Option<i64>)

64-bit signed integer.

Int128(Option<i128>)

128-bit signed integer.

UInt8(Option<u8>)

8-bit unsigned integer.

UInt16(Option<u16>)

16-bit unsigned integer.

UInt32(Option<u32>)

32-bit unsigned integer.

UInt64(Option<u64>)

64-bit unsigned integer.

UInt128(Option<u128>)

128-bit unsigned integer.

Float32(Option<f32>)

32-bit floating point number.

Float64(Option<f64>)

64-bit floating point number.

Decimal(Option<Decimal>, u8, u8)

Decimal (value, precision, scale).

Char(Option<char>)

Single character.

Varchar(Option<Cow<'static, str>>)

Variable-length character string.

Blob(Option<Box<[u8]>>)

Binary large object.

Date(Option<Date>)

Date value (without time).

Time(Option<Time>)

Time value (without date).

Timestamp(Option<PrimitiveDateTime>)

Timestamp (date and time).

TimestampWithTimezone(Option<OffsetDateTime>)

Timestamp with time zone.

Interval(Option<Interval>)

Time interval.

Uuid(Option<Uuid>)

UUID (Universally Unique Identifier).

Array(Option<Box<[Value]>>, Box<Value>, u32)

Homogeneous array (values, inner type, length).

List(Option<Vec<Value>>, Box<Value>)

Variable-length list (values, inner type).

Map(Option<HashMap<Value, Value>>, Box<Value>, Box<Value>)

Map (entries, key type, value type).

Json(Option<Value>)

JSON value.

Struct(Option<Vec<(String, Value)>>, Vec<(String, Value)>, TableRef)

Named struct (fields, field types, type name).

Unknown(Option<String>)

Unknown type (usually used when no further information is available).

Implementations

impl Value

pub fn same_type(&self, other: &Self) -> bool

Checks if two values have the same type, ignoring their actual data.

pub fn is_null(&self) -> bool

Checks if the value is NULL.

pub fn as_null(&self) -> Value

Create a value retaining only the type information, with all data set to NULL.

pub fn try_as(self, target_type: &Value) -> Result<Value>

Attempts to convert the value to the type of another value, if they are compatible.

pub fn is_scalar(&self) -> bool

Checks if the value is a scalar type (not an array, struct, etc.).

Trait Implementations

impl AsValue for Value

fn as_empty_value() -> Value

Return NULL variant.

fn as_value(self) -> Value

Convert to Value.

fn try_from_value(value: Value) -> Result<Self>

where Self: Sized,

Convert from Value.

fn parse(input: impl AsRef<str>) -> Result<Self>

where Self: Sized,

Parse string.

impl Clone for Value

fn clone(&self) -> Value

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Value

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

Formats the value using the given formatter.

impl Default for Value

fn default() -> Value

Returns the “default value” for a type.

impl Display for Value

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

Formats the value using the given formatter.

impl Expression for Value

fn write_query( &self, writer: &dyn SqlWriter, context: &mut Context, out: &mut DynQuery, )

Generates the SQL representation of this expression.

fn accept_visitor( &self, matcher: &mut dyn ExpressionVisitor, writer: &dyn SqlWriter, context: &mut Context, out: &mut DynQuery, ) -> bool

Traverses the expression with a visitor.

fn as_identifier(&self, context: &mut Context) -> String

Renders the expression as a string suitable for use as an identifier.

impl From<&'static str> for Value

fn from(value: &'static str) -> Self

Converts to this type from the input type.

impl From<Value> for DefaultValueType

fn from(value: Value) -> Self

Converts to this type from the input type.

impl Hash for Value

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl OpPrecedence for Value

fn precedence(&self, _writer: &dyn SqlWriter) -> i32

Lower numbers bind weaker, writers parenthesize when child precedence <= operator precedence.

impl PartialEq for Value

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl ToTokens for Value

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.

impl Eq for Value