Enum PostgresUpdateValue 

pub enum PostgresUpdateValue<'a, V: SQLParam, T, Target: DataType = Any, TargetNull: Nullability = Null> {
    Skip,
    Null,
    Value(ValueWrapper<'a, V, (T, Target, TargetNull)>),
}

One column in an UPDATE ... SET: skipped, NULL, or a value or SQL expression.

Generated Update* models store their fields as this type. T is the column’s Rust type; Target and TargetNull are the column’s SQL type and nullability, used to check what can be assigned.

Variants

Skip

Leave the column out of SET, so it keeps its current value.

Null

Set the column to NULL.

Value(ValueWrapper<'a, V, (T, Target, TargetNull)>)

Set the column to a bound value, placeholder or SQL expression.

Implementations

impl<V: SQLParam, T, Target: DataType, TargetNull: Nullability> PostgresUpdateValue<'_, V, T, Target, TargetNull>

pub const fn is_skip(&self) -> bool

Returns true if the column is left out of SET.

Trait Implementations

impl<'a, V: Clone + SQLParam, T: Clone, Target: Clone + DataType, TargetNull: Clone + Nullability> Clone for PostgresUpdateValue<'a, V, T, Target, TargetNull>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a, V: Debug + SQLParam, T: Debug, Target: Debug + DataType, TargetNull: Debug + Nullability> Debug for PostgresUpdateValue<'a, V, T, Target, TargetNull>

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

Formats the value using the given formatter.

impl<'a, V: SQLParam, T, Target: DataType, TargetNull: Nullability> Default for PostgresUpdateValue<'a, V, T, Target, TargetNull>

fn default() -> Self

Returns the “default value” for a type.

impl<'a, Target, TargetNull> From<&str> for PostgresUpdateValue<'a, PostgresValue<'a>, String, Target, TargetNull>

where Target: DataType, TargetNull: Nullability,

fn from(value: &str) -> Self

Converts to this type from the input type.

impl<'a, T, Target, TargetNull, L, R, Op, Actual, ActualNull> From<ColumnBinOp<L, R, Op, PostgresDialect, Actual, ActualNull>> for PostgresUpdateValue<'a, PostgresValue<'a>, T, Target, TargetNull>

where Target: DataType + Assignable<Actual>, TargetNull: Nullability + AcceptsNullability<ActualNull>, Actual: DataType, ActualNull: Nullability, ColumnBinOp<L, R, Op, PostgresDialect, Actual, ActualNull>: ToSQL<'a, PostgresValue<'a>>,

fn from( value: ColumnBinOp<L, R, Op, PostgresDialect, Actual, ActualNull>, ) -> Self

Converts to this type from the input type.

impl<'a, T, Target, TargetNull, E, Actual, ActualNull> From<ColumnNeg<E, PostgresDialect, Actual, ActualNull>> for PostgresUpdateValue<'a, PostgresValue<'a>, T, Target, TargetNull>

where Target: DataType + Assignable<Actual>, TargetNull: Nullability + AcceptsNullability<ActualNull>, Actual: DataType, ActualNull: Nullability, ColumnNeg<E, PostgresDialect, Actual, ActualNull>: ToSQL<'a, PostgresValue<'a>>,

fn from(value: ColumnNeg<E, PostgresDialect, Actual, ActualNull>) -> Self

Converts to this type from the input type.

impl<'a, C, T, Target, TargetNull, Actual, ActualNull> From<Excluded<C>> for PostgresUpdateValue<'a, PostgresValue<'a>, T, Target, TargetNull>

where C: SQLColumnInfo + Expr<'a, PostgresValue<'a>, SQLType = Actual, Nullable = ActualNull>, Target: DataType + Assignable<Actual>, TargetNull: Nullability + AcceptsNullability<ActualNull>, Actual: DataType, ActualNull: Nullability,

fn from(excluded: Excluded<C>) -> Self

Converts to this type from the input type.

impl<'a, T, Target, TargetNull> From<Placeholder> for PostgresUpdateValue<'a, PostgresValue<'a>, T, Target, TargetNull>

where Target: DataType, TargetNull: Nullability,

fn from(placeholder: Placeholder) -> Self

Converts to this type from the input type.

impl<'a, T, Target, TargetNull, Actual, ActualNull, Sources> From<SQLExpr<'a, PostgresValue<'a>, Actual, ActualNull, Scalar, Sources>> for PostgresUpdateValue<'a, PostgresValue<'a>, T, Target, TargetNull>

where Target: DataType + Assignable<Actual>, TargetNull: Nullability + AcceptsNullability<ActualNull>, Actual: DataType, ActualNull: Nullability,

fn from( value: SQLExpr<'a, PostgresValue<'a>, Actual, ActualNull, Scalar, Sources>, ) -> Self

Converts to this type from the input type.

impl<'a, T, Target, TargetNull> From<T> for PostgresUpdateValue<'a, PostgresValue<'a>, T, Target, TargetNull>

where T: TryInto<PostgresValue<'a>>, Target: DataType, TargetNull: Nullability,

Converts any value that converts to a PostgresValue.

Panics

Panics when the value fails to convert (a JSON payload that fails to serialize, for example), rather than storing NULL in its place.

fn from(value: T) -> Self

Converts to this type from the input type.

impl<'a, M, N, T, Target, TargetNull> From<TypedPlaceholder<M, N>> for PostgresUpdateValue<'a, PostgresValue<'a>, T, Target, TargetNull>

where M: DataType, N: Nullability, Target: DataType + Assignable<M>, TargetNull: Nullability + AcceptsNullability<N>,

fn from(typed: TypedPlaceholder<M, N>) -> Self

Converts to this type from the input type.