Struct diesel::sql_types::Nullable

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pub struct Nullable<ST>(_);

Expand description

The nullable SQL type.

This wraps another SQL type to indicate that it can be null. By default all values are assumed to be NOT NULL.

`ToSql` impls

Any T which implements ToSql<ST>
Option<T> for any T which implements ToSql<ST>

`FromSql` impls

Option<T> for any T which implements FromSql<ST>

Trait Implementations

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fn clone(&self) -> Nullable<ST>

Returns a copy of the value. Read more

type Rhs = Nullable<<T as Div>::Rhs>

The SQL type which this one can be divided by

type Output = Nullable<<T as Div>::Output>

The SQL type of the result of dividing Self by Rhs

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impl<T> Foldable for Nullable<T>where
T: Foldable + SqlType<IsNull = NotNull>,

type Sum = <T as Foldable>::Sum

The SQL type of sum(this_type)

type Avg = <T as Foldable>::Avg

The SQL type of avg(this_type)

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impl<T, ST, DB> FromSql<Nullable<ST>, DB> for Option<T>where
 T: FromSql<ST, DB>,
 DB: Backend,
 ST: SqlType<IsNull = NotNull>,

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fn from_sql(bytes: RawValue<'_, DB>) -> Result<Self>

impl<T> IntoNotNullable for Nullable<T>where
T: SqlType,

type NotNullable = T

The not nullable representation of this type. Read more

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impl<T> IntoNullable for Nullable<T>where
T: SqlType,

type Nullable = Nullable<T>

The nullable representation of this type. Read more

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impl<T> Mul for Nullable<T>where
 T: Mul + SqlType<IsNull = NotNull>,
 T::Rhs: SqlType<IsNull = NotNull>,
 T::Output: SqlType<IsNull = NotNull>,

type Rhs = Nullable<<T as Mul>::Rhs>

The SQL type which this can be multiplied by

type Output = Nullable<<T as Mul>::Output>

The SQL type of the result of multiplying Self by Rhs

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impl<T> QueryId for Nullable<T>where
T: QueryId + SqlType<IsNull = NotNull>,

type QueryId = <T as QueryId>::QueryId

A type which uniquely represents Self in a SQL query. Read more

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const HAS_STATIC_QUERY_ID: bool = T::HAS_STATIC_QUERY_ID

Can the SQL generated by Self be uniquely identified by its type? Read more

Is this type nullable? Read more

See the trait documentation.

Auto Trait Implementations

impl<ST> RefUnwindSafe for Nullable<ST>where
ST: RefUnwindSafe,

impl<ST> Send for Nullable<ST>where
ST: Send,

impl<ST> Sync for Nullable<ST>where
ST: Sync,

impl<ST> Unpin for Nullable<ST>where
ST: Unpin,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoSql for T

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fn into_sql<T>(self) -> AsExprOf<Self, T>where
Self: AsExpression<T> + Sized,
T: SqlType + TypedExpressionType,

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

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fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>where
&'a Self: AsExpression<T>,
T: SqlType + TypedExpressionType,

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

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impl<T> ToOwned for Twhere
T: Clone,

type Owned = T

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Struct diesel::sql_types::Nullable

ToSql impls

FromSql impls

Trait Implementations

impl<T> Add for Nullable<T>where T: Add + SqlType<IsNull = NotNull>, T::Rhs: SqlType<IsNull = NotNull>, T::Output: SqlType<IsNull = NotNull>,

type Rhs = Nullable<<T as Add>::Rhs>

type Output = Nullable<<T as Add>::Output>

impl<'expr> AsExpression<Nullable<BigInt>> for &'expr i64

type Expression = Bound<Nullable<BigInt>, &'expr i64>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<BigInt>> for &'expr2 &'expr i64

type Expression = Bound<Nullable<BigInt>, &'expr2 &'expr i64>

fn as_expression(self) -> Self::Expression

impl AsExpression<Nullable<BigInt>> for i64

type Expression = Bound<Nullable<BigInt>, i64>

fn as_expression(self) -> Self::Expression

impl<'expr> AsExpression<Nullable<Binary>> for &'expr [u8]

type Expression = Bound<Nullable<Binary>, &'expr [u8]>

fn as_expression(self) -> Self::Expression

impl<'expr> AsExpression<Nullable<Binary>> for &'expr Vec<u8>

type Expression = Bound<Nullable<Binary>, &'expr Vec<u8, Global>>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<Binary>> for &'expr2 &'expr [u8]

type Expression = Bound<Nullable<Binary>, &'expr2 &'expr [u8]>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<Binary>> for &'expr2 &'expr Vec<u8>

type Expression = Bound<Nullable<Binary>, &'expr2 &'expr Vec<u8, Global>>

fn as_expression(self) -> Self::Expression

impl AsExpression<Nullable<Binary>> for Vec<u8>

type Expression = Bound<Nullable<Binary>, Vec<u8, Global>>

fn as_expression(self) -> Self::Expression

impl<'expr> AsExpression<Nullable<Bool>> for &'expr bool

type Expression = Bound<Nullable<Bool>, &'expr bool>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<Bool>> for &'expr2 &'expr bool

type Expression = Bound<Nullable<Bool>, &'expr2 &'expr bool>

fn as_expression(self) -> Self::Expression

impl AsExpression<Nullable<Bool>> for bool

type Expression = Bound<Nullable<Bool>, bool>

fn as_expression(self) -> Self::Expression

impl AsExpression<Nullable<Date>> for today

type Expression = Coerce<today, Nullable<Date>>

fn as_expression(self) -> Self::Expression

impl<'expr> AsExpression<Nullable<Double>> for &'expr f64

type Expression = Bound<Nullable<Double>, &'expr f64>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<Double>> for &'expr2 &'expr f64

type Expression = Bound<Nullable<Double>, &'expr2 &'expr f64>

fn as_expression(self) -> Self::Expression

impl AsExpression<Nullable<Double>> for f64

type Expression = Bound<Nullable<Double>, f64>

fn as_expression(self) -> Self::Expression

impl<'expr> AsExpression<Nullable<Float>> for &'expr f32

type Expression = Bound<Nullable<Float>, &'expr f32>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<Float>> for &'expr2 &'expr f32

type Expression = Bound<Nullable<Float>, &'expr2 &'expr f32>

fn as_expression(self) -> Self::Expression

impl AsExpression<Nullable<Float>> for f32

type Expression = Bound<Nullable<Float>, f32>

fn as_expression(self) -> Self::Expression

impl<'expr> AsExpression<Nullable<Integer>> for &'expr i32

type Expression = Bound<Nullable<Integer>, &'expr i32>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<Integer>> for &'expr2 &'expr i32

type Expression = Bound<Nullable<Integer>, &'expr2 &'expr i32>

fn as_expression(self) -> Self::Expression

impl AsExpression<Nullable<Integer>> for i32

type Expression = Bound<Nullable<Integer>, i32>

fn as_expression(self) -> Self::Expression

impl<'a, T, ST> AsExpression<Nullable<ST>> for &'a Option<T>where ST: SqlType<IsNull = NotNull>, Nullable<ST>: TypedExpressionType,

type Expression = Bound<Nullable<ST>, &'a Option<T>>

fn as_expression(self) -> Self::Expression

impl<T, ST> AsExpression<Nullable<ST>> for Option<T>where ST: SqlType<IsNull = NotNull>, Nullable<ST>: TypedExpressionType,

type Expression = Bound<Nullable<ST>, Option<T>>

fn as_expression(self) -> Self::Expression

impl<'expr> AsExpression<Nullable<SmallInt>> for &'expr i16

type Expression = Bound<Nullable<SmallInt>, &'expr i16>

fn as_expression(self) -> Self::Expression

impl<'expr2, 'expr> AsExpression<Nullable<SmallInt>> for &'expr2 &'expr i16

`ToSql` impls

`FromSql` impls

impl<T> Add for Nullable<T>where
T: Add + SqlType<IsNull = NotNull>,
T::Rhs: SqlType<IsNull = NotNull>,
T::Output: SqlType<IsNull = NotNull>,

impl<'a, T, ST> AsExpression<Nullable<ST>> for &'a Option<T>where
ST: SqlType<IsNull = NotNull>,
Nullable<ST>: TypedExpressionType,

impl<T, ST> AsExpression<Nullable<ST>> for Option<T>where
ST: SqlType<IsNull = NotNull>,
Nullable<ST>: TypedExpressionType,

impl<T> Div for Nullable<T>where
T: Div + SqlType<IsNull = NotNull>,
T::Rhs: SqlType<IsNull = NotNull>,
T::Output: SqlType<IsNull = NotNull>,

impl<T> Foldable for Nullable<T>where
T: Foldable + SqlType<IsNull = NotNull>,

impl<T, ST, DB> FromSql<Nullable<ST>, DB> for Option<T>where
T: FromSql<ST, DB>,
DB: Backend,
ST: SqlType<IsNull = NotNull>,