Struct Update 

pub struct Update {
    pub target: UpdateTarget,
    pub assignments: Assignments,
    pub filter: Filter,
    pub condition: Condition,
    pub returning: Option<Returning>,
}

An UPDATE statement that modifies existing records.

Combines a target (what to update), assignments (how to change fields), a filter (which records to update), an optional condition (a guard that must hold for the update to apply), and an optional returning clause.

Examples

use toasty_core::stmt::{Update, UpdateTarget, Assignments, Filter, Condition};
use toasty_core::schema::app::ModelId;

let update = Update {
    target: UpdateTarget::Model(ModelId(0)),
    assignments: Assignments::default(),
    filter: Filter::default(),
    condition: Condition::default(),
    returning: None,
};

Fields

target: UpdateTarget

The target to update (model, table, or query).

assignments: Assignments

The field assignments to apply.

filter: Filter

Filter selecting which records to update (WHERE clause).

condition: Condition

An optional condition that must be satisfied for the update to apply. Unlike filter, a condition failing does not produce an error but silently skips the update.

returning: Option<Returning>

Optional RETURNING clause.

Implementations

impl Update

pub fn selection(&self) -> Query

Returns a Query that selects the records this update would modify.

Trait Implementations

impl Clone for Update

fn clone(&self) -> Update

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Update

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

Formats the value using the given formatter.

impl From<Update> for ExprSet

fn from(value: Update) -> ExprSet

Converts to this type from the input type.

impl<'a, T> IntoExprTarget<'a, T> for &'a Update

where T: Resolve,

fn into_expr_target(self, schema: &'a T) -> ExprTarget<'a>

Converts self into an ExprTarget using the provided schema.

impl Node for Update

fn visit<V>(&self, visit: V)

where V: Visit,

Traverses this node with an immutable visitor.

fn visit_mut<V>(&mut self, visit: V)

where V: VisitMut,

Traverses this node with a mutable visitor.

impl PartialEq for Update

fn eq(&self, other: &Update) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Update