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RowShape

Struct RowShape 

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pub struct RowShape {
    pub columns: Vec<RowCol>,
    pub present_alias: Option<String>,
}
Expand description

SELECT 输出的一列:SQL 别名(如 t1_title / rel0_amount)→ JSON 里的嵌套还原路径

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§columns: Vec<RowCol>

列 → { jsonPath, isArray }。jsonPath 形如 ["title"] 或 ["items","amount"], 表示该列应嵌套还原到文档的哪个位置;isArray 表示该字段是关系数组(聚合还原)。

§present_alias: Option<String>

__present 哨兵列的别名(缺失 vs null 三态,F-07/H-01):该列存每行 「哪些标量字段显式存在」的集合。读取时标量列值为 null,仅当字段存在于 该集合才还原为 key: null,否则(缺失)不产出该键。None 表示本条语句 未查该列(如 count / 关系聚合),还原时不做存在性判定。

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impl RowShape

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pub fn empty() -> Self

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pub fn to_value(&self) -> Value

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impl RowShape

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pub fn from_value(v: &Value) -> Result<RowShape, String>

从绑定层传入的 JSON 解析(与 to_value 对称)

Trait Implementations§

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impl Clone for RowShape

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fn clone(&self) -> Self

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 RowShape

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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 PartialEq for RowShape

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl StructuralPartialEq for RowShape

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<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> 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 = !

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

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.