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Value

Enum Value 

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pub enum Value {
Show 18 variants Null, Bool(bool), Short(i16), Int(i32), BigInt(i64), Float(f32), Double(f64), Text(String), Bytes(Vec<u8>), Blob(u64), Array(u64), Date(i32), Time(u32), Timestamp(i32, u32), Int128(i128), DecFloat(DecFloat), TimeTz(TimeTz), TimestampTz(TimestampTz),
}
Expand description

Um valor SQL decodificado. Tipos numéricos com escala diferente de zero (NUMERIC/DECIMAL) mantêm seu inteiro bruto; consulte a ColumnMeta::scale da coluna para renderizar o ponto decimal.

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Null

Valor SQL NULL.

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Bool(bool)

Booleano SQL (BOOLEAN).

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Short(i16)

SMALLINT (também a mantissa bruta de um NUMERIC com escala baseado em SMALLINT).

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Int(i32)

INTEGER (ou NUMERIC com escala baseado em INTEGER).

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BigInt(i64)

BIGINT (ou NUMERIC com escala baseado em BIGINT).

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Float(f32)

Número de ponto flutuante de 32 bits (FLOAT).

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Double(f64)

Número de ponto flutuante de 64 bits (DOUBLE PRECISION).

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Text(String)

Texto CHAR/VARCHAR, decodificado conforme o charset da conexão (ver crate::charset::Charset); CHAR vem sem o padding de espaços à direita.

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Bytes(Vec<u8>)

Bytes brutos para CHAR/VARCHAR binário (OCTETS) e outros dados opacos.

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Blob(u64)

Identificador de blob (busque o conteúdo separadamente).

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Array(u64)

Identificador de ARRAY (um quad, como o blob). Leia os elementos com crate::Connection::read_array usando o crate::ArrayDesc da coluna.

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Date(i32)

Dias desde 1858-11-17 (a época Firebird/Modified-Julian).

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Time(u32)

Hora em décimos de milésimo de segundo desde a meia-noite.

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Timestamp(i32, u32)

Par (data, hora) usando as duas codificações acima.

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Int128(i128)

Inteiro de 128 bits (INT128 / NUMERIC amplo).

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DecFloat(DecFloat)

DECFLOAT(16)/DECFLOAT(34) decodificado (ponto flutuante decimal IEEE).

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TimeTz(TimeTz)

TIME WITH TIME ZONE (FB4+): hora UTC + zona.

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TimestampTz(TimestampTz)

TIMESTAMP WITH TIME ZONE (FB4+): carimbo UTC + zona.

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impl Value

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pub fn is_null(&self) -> bool

Verdadeiro quando o valor é Value::Null.

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pub fn date(year: i32, month: u32, day: u32) -> Value

Constrói um Value::Date a partir de uma data civil.

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pub fn time(hour: u32, minute: u32, second: u32, frac: u32) -> Value

Constrói um Value::Time a partir de uma hora civil (frac em 1/10000 s).

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pub fn timestamp(date: CivilDate, time: CivilTime) -> Value

Constrói um Value::Timestamp a partir de data + hora civis.

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pub fn as_civil_date(&self) -> Option<CivilDate>

Decodifica um Value::Date (ou a parte de data de um Timestamp) em uma data civil.

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pub fn as_civil_time(&self) -> Option<CivilTime>

Decodifica um Value::Time (ou a parte de hora de um Timestamp) em uma hora civil.

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pub fn as_civil_timestamp(&self) -> Option<CivilTimestamp>

Decodifica um Value::Timestamp em data + hora civis.

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pub fn as_i64(&self) -> Option<i64>

Visão i64 de melhor esforço de um valor inteiro.

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pub fn as_str(&self) -> Option<&str>

Empresta o texto de um valor de string.

Trait Implementations§

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impl Clone for Value

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fn clone(&self) -> Value

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for Value

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

Formats the value using the given formatter. Read more
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impl From<&[u8]> for Value

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fn from(v: &[u8]) -> Self

Converts to this type from the input type.
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impl From<&str> for Value

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fn from(v: &str) -> Self

Converts to this type from the input type.
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impl From<String> for Value

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fn from(v: String) -> Self

Converts to this type from the input type.
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impl From<Vec<u8>> for Value

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fn from(v: Vec<u8>) -> Self

Converts to this type from the input type.
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impl From<bool> for Value

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fn from(v: bool) -> Self

Converts to this type from the input type.
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impl From<f32> for Value

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fn from(v: f32) -> Self

Converts to this type from the input type.
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impl From<f64> for Value

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fn from(v: f64) -> Self

Converts to this type from the input type.
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impl From<i16> for Value

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fn from(v: i16) -> Self

Converts to this type from the input type.
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impl From<i32> for Value

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fn from(v: i32) -> Self

Converts to this type from the input type.
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impl From<i64> for Value

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fn from(v: i64) -> Self

Converts to this type from the input type.
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impl From<i128> for Value

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fn from(v: i128) -> Self

Converts to this type from the input type.
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impl PartialEq for Value

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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

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

Auto Trait Implementations§

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impl Freeze for Value

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impl RefUnwindSafe for Value

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impl Send for Value

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impl Sync for Value

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impl Unpin for Value

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impl UnsafeUnpin for Value

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impl UnwindSafe for Value

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT
where ST: ?Sized, DT: ?Sized,

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impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT
where ST: ?Sized, DT: ?Sized,

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Read<Exclusive, BecauseExclusive> for T
where T: ?Sized,

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V