Skip to main content

Literal

Struct Literal 

Source
pub struct Literal<T>
where T: Clone,
{ /* private fields */ }
Expand description

字面量表达式

将 Rust 值包装为 SQL 字面量(参数化)。

SqlType 由值类型派生:i64BigInti32IntegerStringTextboolBoolf64Doublef32RealVec<u8>Binary。 其他类型需显式实现 TypedExpression

Implementations§

Source§

impl<T> Literal<T>
where T: Clone,

Source

pub fn new(value: T) -> Literal<T>

创建字面量

Trait Implementations§

Source§

impl TypedExpression for Literal<i64>

Literal<i64> → SQL BigInt 类型

Source§

type SqlType = BigInt

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<i32>

Literal<i32> → SQL Integer 类型

Source§

type SqlType = Integer

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<i16>

Literal<i16> → SQL SmallInt 类型

Source§

type SqlType = SmallInt

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<i8>

Literal<i8> → SQL SmallInt 类型

Source§

type SqlType = SmallInt

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<f64>

Literal<f64> → SQL Double 类型

Source§

type SqlType = Double

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<f32>

Literal<f32> → SQL Real 类型

Source§

type SqlType = Real

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<String>

Literal<String> → SQL Text 类型

Source§

type SqlType = Text

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<bool>

Literal<bool> → SQL Bool 类型

Source§

type SqlType = Bool

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more
Source§

impl TypedExpression for Literal<Vec<u8>>

Literal<Vec<u8>> → SQL Binary 类型

Source§

type SqlType = Binary

表达式的 SQL 类型
Source§

fn to_sql(&self, _dialect: &dyn Dialect) -> (String, Vec<String>)

生成 SQL 片段(含参数占位符 ?Read more

Auto Trait Implementations§

§

impl<T> Freeze for Literal<T>
where T: Freeze,

§

impl<T> RefUnwindSafe for Literal<T>
where T: RefUnwindSafe,

§

impl<T> Send for Literal<T>
where T: Send,

§

impl<T> Sync for Literal<T>
where T: Sync,

§

impl<T> Unpin for Literal<T>
where T: Unpin,

§

impl<T> UnsafeUnpin for Literal<T>
where T: UnsafeUnpin,

§

impl<T> UnwindSafe for Literal<T>
where T: UnwindSafe,

Blanket Implementations§

Source§

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

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

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

Mutably borrows from an owned value. Read more
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T> Instrument for T

Source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
Source§

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

Source§

fn into(self) -> U

Calls U::from(self).

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

Source§

impl<T> IntoEither for T

Source§

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
Source§

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
Source§

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

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

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

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

impl<T> WithSubscriber for T

Source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
Source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more