Enum MySQLUpdateValue 

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

One field of a generated update model: unchanged, NULL, or a new value.

You rarely build this directly. The with_* setters on a generated UpdateX model convert their arguments into it.

Variants

Skip

Leave the column out of the SET clause.

Null

Assign SQL NULL.

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

Assign a value, placeholder, or typed SQL expression.

Implementations

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

pub const fn is_skip(&self) -> bool

Returns true if the column is left out of the SET clause.

Trait Implementations

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

fn default() -> Self

Returns the “default value” for a type.

impl<'a, Target, TargetNull> From<&str> for MySQLUpdateValue<'a, MySQLValue<'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, MySQLDialect, Actual, ActualNull>> for MySQLUpdateValue<'a, MySQLValue<'a>, T, Target, TargetNull>

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

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

Converts to this type from the input type.

impl<'a, T, Target, TargetNull, E, Actual, ActualNull> From<ColumnNeg<E, MySQLDialect, Actual, ActualNull>> for MySQLUpdateValue<'a, MySQLValue<'a>, T, Target, TargetNull>

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

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

Converts to this type from the input type.

impl<'a, T, Target, TargetNull> From<Placeholder> for MySQLUpdateValue<'a, MySQLValue<'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, MySQLValue<'a>, Actual, ActualNull, Scalar, Sources>> for MySQLUpdateValue<'a, MySQLValue<'a>, T, Target, TargetNull>

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

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

Converts to this type from the input type.

impl<'a, T, Target, TargetNull> From<T> for MySQLUpdateValue<'a, MySQLValue<'a>, T, Target, TargetNull>

where T: Into<MySQLValue<'a>>, Target: DataType, TargetNull: Nullability,

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 MySQLUpdateValue<'a, MySQLValue<'a>, T, Target, TargetNull>

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

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

Converts to this type from the input type.