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ColumnExpr

sz_orm_core

Struct ColumnExpr 

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pub struct ColumnExpr<C>
where
    C: TypedColumn,
{ /* private fields */ }
Expand description

列引用表达式

将 TypedColumn 包装为 TypedExpression， 使列可直接用于表达式位置（如 SELECT 子句）。

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impl<C> ColumnExpr<C>
where C: TypedColumn,

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pub fn new() -> ColumnExpr<C>

创建列引用表达式

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impl<C> Default for ColumnExpr<C>
where C: TypedColumn,

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fn default() -> ColumnExpr<C>

Returns the “default value” for a type. Read more
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impl<C> ExprTable for ColumnExpr<C>
where C: TypedColumn,

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type Table = <C as TypedColumn>::Table

表达式所属的表
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impl<C> TypedExpression for ColumnExpr<C>
where C: TypedColumn,

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type SqlType = <C as TypedColumn>::SqlType

表达式的 SQL 类型
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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§

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impl<C> Freeze for ColumnExpr<C>

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impl<C> RefUnwindSafe for ColumnExpr<C>
where C: RefUnwindSafe,

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impl<C> Send for ColumnExpr<C>
where C: Send,

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impl<C> Sync for ColumnExpr<C>
where C: Sync,

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impl<C> Unpin for ColumnExpr<C>
where C: Unpin,

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impl<C> UnsafeUnpin for ColumnExpr<C>

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impl<C> UnwindSafe for ColumnExpr<C>
where C: UnwindSafe,

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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<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> IntoEither for T

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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
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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
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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<T> WithSubscriber for T

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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
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fn with_current_subscriber(self) -> WithDispatch<Self>

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