Trait SelectColumnResult 

pub trait SelectColumnResult {
    type Output;

    // Required methods
    fn column_names(&self) -> Vec<String>;
    fn aggregate_funcs(&self) -> Vec<Option<String>>;
}

SelectColumnResult trait - 用于 select_column 方法的返回类型

Required Associated Types

type Output

Required Methods

fn column_names(&self) -> Vec<String>

fn aggregate_funcs(&self) -> Vec<Option<String>>

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<T1, T2, T3> SelectColumnResult for (TypedColumn<T1>, TypedColumn<T2>, TypedColumn<T3>)

type Output = (T1, T2, T3)

fn column_names(&self) -> Vec<String>

fn aggregate_funcs(&self) -> Vec<Option<String>>

impl<T1, T2> SelectColumnResult for (TypedColumn<T1>, TypedColumn<T2>)

type Output = (T1, T2)

fn column_names(&self) -> Vec<String>

fn aggregate_funcs(&self) -> Vec<Option<String>>

Implementors

impl<T> SelectColumnResult for TypedColumn<T>

type Output = T