Trait ExprTable 

pub trait ExprTable {
    type Table: TypedTable;
}

表达式所属的表（用于跨表列引用检查）

该 trait 将表达式与其所属的表关联，使 TypedSelectQuery::filter 能在编译期 拒绝引用了其他表的列的表达式。

• 列引用/比较表达式：表由列的 TypedColumn::Table 决定
• 逻辑组合表达式（And/Or）：两侧子表达式必须属于同一张表

跨表拒绝示例

// 假设 ColPostTitle 属于 PostsTable，而查询是 TypedSelectQuery::<UsersTable>
// 以下代码无法编译：
TypedSelectQuery::<UsersTable>::new()
    .filter(ColPostTitle.eq("hello"));  // ❌ ExprTable<Table = PostsTable> 不满足 Table = UsersTable

Required Associated Types

type Table: TypedTable

表达式所属的表

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<C, V> ExprTable for Eq<C, V>

where C: TypedColumn, V: Clone,

type Table = <C as TypedColumn>::Table

impl<C, V> ExprTable for Ge<C, V>

where C: TypedColumn, V: Clone,

type Table = <C as TypedColumn>::Table

impl<C, V> ExprTable for Gt<C, V>

where C: TypedColumn, V: Clone,

type Table = <C as TypedColumn>::Table

impl<C, V> ExprTable for Le<C, V>

where C: TypedColumn, V: Clone,

type Table = <C as TypedColumn>::Table

impl<C, V> ExprTable for Lt<C, V>

where C: TypedColumn, V: Clone,

type Table = <C as TypedColumn>::Table

impl<C, V> ExprTable for Ne<C, V>

where C: TypedColumn, V: Clone,

type Table = <C as TypedColumn>::Table

impl<C> ExprTable for ColumnExpr<C>

where C: TypedColumn,

type Table = <C as TypedColumn>::Table

impl<L, R> ExprTable for And<L, R>

where L: ExprTable + TypedExpression<SqlType = Bool>, R: TypedExpression<SqlType = Bool> + ExprTable<Table = <L as ExprTable>::Table>,

type Table = <L as ExprTable>::Table

impl<L, R> ExprTable for Or<L, R>

where L: ExprTable + TypedExpression<SqlType = Bool>, R: TypedExpression<SqlType = Bool> + ExprTable<Table = <L as ExprTable>::Table>,

type Table = <L as ExprTable>::Table