Trait Statement 

pub trait Statement: Sealed {
    type Dialect: Dialect;
    type Table: Table;

    // Provided methods
    fn to_sql(&self, _dialect: Self::Dialect) -> (String, Vec<Value>) { ... }
    fn returning<Sel, Idx>(self, sel: Sel) -> Returning<Self, Sel>
       where Self: Sized,
             Self::Dialect: SupportsReturning,
             Sel: Selection<WrittenTable<Self::Table>, Idx> { ... }
}

A statement that writes to a single table. Sealed: the three writing statements are the whole set, and Returning is defined against this rather than against each of them.

Required Associated Types

type Dialect: Dialect

type Table: Table

Provided Methods

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

The dialect is an argument for the reason Select::to_sql’s is.

fn returning<Sel, Idx>(self, sel: Sel) -> Returning<Self, Sel>

where Self: Sized, Self::Dialect: SupportsReturning, Sel: Selection<WrittenTable<Self::Table>, Idx>,

RETURNING, on whichever of the three this is — the clause is the same clause. A distinct type rather than Self with a flag set: the execution layer needs Sel’s concrete type to know what to decode a returned row into, and an optional field would erase it.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl<D: Dialect, R: InsertRow> Statement for Insert<D, R>

type Dialect = D

type Table = <R as InsertRow>::Table

impl<D: Dialect, T: Table> Statement for Delete<D, T>

type Dialect = D

type Table = T

impl<D: Dialect, T: Table> Statement for Update<D, T>

type Dialect = D

type Table = T