Enum RawArg 

pub enum RawArg {
    Value(Value),
    Expr(Expr),
    Named(Cow<'static, str>),
}

One replacement for a ? in an Expr::Template.

A ? either binds a value or splices in a whole expression. The second form is what lets WHERE id IN (?) expand to IN ($3, $4, $5): the nested expression consumes as many placeholder positions as it binds arguments, and the counter keeps going from there.

Variants

Value(Value)

Bind a value; the ? becomes the dialect’s positional placeholder.

Expr(Expr)

Render an expression in place of the ?.

Named(Cow<'static, str>)

Write a named placeholder. Binds nothing, consumes no position, and records Error::NoNamedArgs on a dialect that has no named-argument syntax.

Implementations

impl RawArg

pub fn value(v: impl ToValue) -> RawArg

A bound value.

pub fn expr(e: impl IntoExpr) -> RawArg

A spliced expression.

pub fn named(name: impl Into<Cow<'static, str>>) -> RawArg

A named placeholder.

Trait Implementations

impl Clone for RawArg

fn clone(&self) -> RawArg

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RawArg

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.