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ColumnMeta

Struct ColumnMeta 

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pub struct ColumnMeta {
    pub index: usize,
    pub sql_type: i32,
    pub sub_type: i32,
    pub scale: i32,
    pub length: i32,
    pub nullable: bool,
    pub field: String,
    pub relation: String,
    pub alias: String,
    pub owner: String,
}
Expand description

Metadados que descrevem uma coluna da saída de uma instrução preparada (ou um de seus parâmetros de entrada).

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§index: usize

Posição na mensagem, começando em zero.

§sql_type: i32

Tipo SQL base (SQL_*, com o bit anulável removido).

§sub_type: i32

Sub-tipo Firebird. Para texto pode indicar charset; para BLOB indica o sub-tipo do BLOB.

§scale: i32

Escala de tipos numéricos (NUMERIC/DECIMAL); valores negativos indicam casas decimais.

§length: i32

Comprimento declarado em bytes (CHAR/VARCHAR) ou largura do tipo.

§nullable: bool

Verdadeiro se a coluna ou parâmetro aceita NULL.

§field: String

Nome subjacente da coluna.

§relation: String

Nome da relação/tabela de origem, quando o servidor informa.

§alias: String

Alias de saída (o nome que a lista SELECT deu a ela).

§owner: String

Dono da relação de origem, quando o servidor informa.

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impl ColumnMeta

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pub fn name(&self) -> &str

O nome que os chamadores veem para esta coluna (alias se presente, senão field).

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impl Clone for ColumnMeta

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fn clone(&self) -> ColumnMeta

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 ColumnMeta

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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 Default for ColumnMeta

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fn default() -> ColumnMeta

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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