Trait diesel::expression::AsExpression

pub trait AsExpression<T: NativeSqlType> {
    type Expression: Expression<SqlType=T>;
    fn as_expression(self) -> Self::Expression;
}

Describes how a type can be represented as an expression for a given type. These types couldn't just implement Expression directly, as many things can be used as an expression of multiple types. (String for example, can be used as either VarChar or Text).

This trait allows us to use primitives on the right hand side of various expressions. For example name.eq("Sean")

Associated Types

type Expression: Expression<SqlType=T>

Required Methods

fn as_expression(self) -> Self::Expression

Implementors

• impl<T: Expression> AsExpression<T::SqlType> for T
• impl<'a, ST, T> AsExpression<Array<ST>> for &'a [T] where ST: NativeSqlType, T: ToSql<ST>
• impl<ST, T> AsExpression<Array<ST>> for Vec<T> where ST: NativeSqlType, T: ToSql<ST>
• impl<'a, ST, T> AsExpression<Array<ST>> for &'a Vec<T> where ST: NativeSqlType, T: ToSql<ST>
• impl<'a> AsExpression<Date> for PgDate
• impl<'a: 'expr, 'expr> AsExpression<Date> for &'expr PgDate
• impl<'a> AsExpression<Nullable<Date>> for PgDate
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Date>> for &'a PgDate
• impl<'a> AsExpression<Interval> for PgInterval
• impl<'a: 'expr, 'expr> AsExpression<Interval> for &'expr PgInterval
• impl<'a> AsExpression<Nullable<Interval>> for PgInterval
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Interval>> for &'a PgInterval
• impl<'a> AsExpression<Time> for PgTime
• impl<'a: 'expr, 'expr> AsExpression<Time> for &'expr PgTime
• impl<'a> AsExpression<Nullable<Time>> for PgTime
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Time>> for &'a PgTime
• impl<'a> AsExpression<Timestamp> for PgTimestamp
• impl<'a: 'expr, 'expr> AsExpression<Timestamp> for &'expr PgTimestamp
• impl<'a> AsExpression<Nullable<Timestamp>> for PgTimestamp
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Timestamp>> for &'a PgTimestamp
• impl<T, ST> AsExpression<Nullable<ST>> for Option<T> where Option<T>: ToSql<Nullable<ST>>, ST: NativeSqlType
• impl<'a, T, ST> AsExpression<Nullable<ST>> for &'a Option<T> where Option<T>: ToSql<Nullable<ST>>, ST: NativeSqlType
• impl<'a> AsExpression<Bool> for bool
• impl<'a: 'expr, 'expr> AsExpression<Bool> for &'expr bool
• impl<'a> AsExpression<Nullable<Bool>> for bool
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Bool>> for &'a bool
• impl<'a> AsExpression<SmallInt> for i16
• impl<'a: 'expr, 'expr> AsExpression<SmallInt> for &'expr i16
• impl<'a> AsExpression<Nullable<SmallInt>> for i16
• impl<'a: 'expr, 'expr> AsExpression<Nullable<SmallInt>> for &'a i16
• impl<'a> AsExpression<Integer> for i32
• impl<'a: 'expr, 'expr> AsExpression<Integer> for &'expr i32
• impl<'a> AsExpression<Nullable<Integer>> for i32
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Integer>> for &'a i32
• impl<'a> AsExpression<BigInt> for i64
• impl<'a: 'expr, 'expr> AsExpression<BigInt> for &'expr i64
• impl<'a> AsExpression<Nullable<BigInt>> for i64
• impl<'a: 'expr, 'expr> AsExpression<Nullable<BigInt>> for &'a i64
• impl<'a> AsExpression<Oid> for u32
• impl<'a: 'expr, 'expr> AsExpression<Oid> for &'expr u32
• impl<'a> AsExpression<Nullable<Oid>> for u32
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Oid>> for &'a u32
• impl<'a> AsExpression<Float> for f32
• impl<'a: 'expr, 'expr> AsExpression<Float> for &'expr f32
• impl<'a> AsExpression<Nullable<Float>> for f32
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Float>> for &'a f32
• impl<'a> AsExpression<Double> for f64
• impl<'a: 'expr, 'expr> AsExpression<Double> for &'expr f64
• impl<'a> AsExpression<Nullable<Double>> for f64
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Double>> for &'a f64
• impl<'a> AsExpression<Numeric> for PgNumeric
• impl<'a: 'expr, 'expr> AsExpression<Numeric> for &'expr PgNumeric
• impl<'a> AsExpression<Nullable<Numeric>> for PgNumeric
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Numeric>> for &'a PgNumeric
• impl<'a> AsExpression<VarChar> for String
• impl<'a: 'expr, 'expr> AsExpression<VarChar> for &'expr String
• impl<'a> AsExpression<Nullable<VarChar>> for String
• impl<'a: 'expr, 'expr> AsExpression<Nullable<VarChar>> for &'a String
• impl<'a> AsExpression<Text> for String
• impl<'a: 'expr, 'expr> AsExpression<Text> for &'expr String
• impl<'a> AsExpression<Nullable<Text>> for String
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Text>> for &'a String
• impl<'a> AsExpression<Binary> for Vec<u8>
• impl<'a: 'expr, 'expr> AsExpression<Binary> for &'expr Vec<u8>
• impl<'a> AsExpression<Nullable<Binary>> for Vec<u8>
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Binary>> for &'a Vec<u8>
• impl<'a> AsExpression<VarChar> for &'a str
• impl<'a: 'expr, 'expr> AsExpression<VarChar> for &'expr &'a str
• impl<'a> AsExpression<Nullable<VarChar>> for &'a str
• impl<'a: 'expr, 'expr> AsExpression<Nullable<VarChar>> for &'a &'a str
• impl<'a> AsExpression<Text> for &'a str
• impl<'a: 'expr, 'expr> AsExpression<Text> for &'expr &'a str
• impl<'a> AsExpression<Nullable<Text>> for &'a str
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Text>> for &'a &'a str
• impl<'a> AsExpression<Binary> for &'a [u8]
• impl<'a: 'expr, 'expr> AsExpression<Binary> for &'expr &'a [u8]
• impl<'a> AsExpression<Nullable<Binary>> for &'a [u8]
• impl<'a: 'expr, 'expr> AsExpression<Nullable<Binary>> for &'a &'a [u8]