Trait _

pub trait _ {
    // Provided methods
    fn into_sql<T>(self) -> Self::Expression
       where Self: Sized + AsExpression<T>,
             T: SqlType + TypedExpressionType { ... }
    fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expression
       where &'a Self: AsExpression<T>,
             T: SqlType + TypedExpressionType { ... }
}

Converts a type to its representation for use in Diesel’s query builder.

This trait only exists to make usage of AsExpression more ergonomic when the SqlType cannot be inferred. It is generally used when you need to use a Rust value as the left hand side of an expression, or when you want to select a constant value.

Example

use diesel::sql_types::Text;
let names = users::table
    .select("The Amazing ".into_sql::<Text>().concat(users::name))
    .load(conn);
let expected_names = vec![
    "The Amazing Sean".to_string(),
    "The Amazing Tess".to_string(),
];
assert_eq!(Ok(expected_names), names);

Provided Methods

fn into_sql<T>(self) -> Self::Expression

where Self: Sized + AsExpression<T>, T: SqlType + TypedExpressionType,

Convert self to an expression for Diesel’s query builder.

There is no difference in behavior between x.into_sql::<Y>() and AsExpression::<Y>::as_expression(x).

fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expression

where &'a Self: AsExpression<T>, T: SqlType + TypedExpressionType,

Convert &self to an expression for Diesel’s query builder.

There is no difference in behavior between x.as_sql::<Y>() and AsExpression::<Y>::as_expression(&x).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<T> IntoSql for T