Struct ConflictTarget 

pub struct ConflictTarget {
    pub constraint: Option<Cow<'static, str>>,
    pub columns: Vec<Expr>,
    pub where_: Where,
}

What the conflict is detected on: a named constraint, or an index inferred from a column list and an optional predicate.

A constraint name wins outright, because PostgreSQL forbids combining the two — ON CONSTRAINT names an index directly and leaves nothing to infer.

Fields

constraint: Option<Cow<'static, str>>

ON CONSTRAINT <name>. Quoted on output.

columns: Vec<Expr>

The columns or expressions the unique index is over.

where_: Where

The partial index’s predicate — matched against the index definition, not evaluated against rows.

Implementations

impl ConflictTarget

pub fn on_columns(columns: impl IntoExprList) -> Self

Infer the index from columns.

pub fn on_constraint(name: impl Into<Cow<'static, str>>) -> Self

Name the constraint directly.

pub fn is_empty(&self) -> bool

Whether the target is absent, so that any conflict is handled.

Trait Implementations

impl Clone for ConflictTarget

fn clone(&self) -> ConflictTarget

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConflictTarget

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

Formats the value using the given formatter.

impl Default for ConflictTarget

fn default() -> ConflictTarget

Returns the “default value” for a type.

impl Expression for ConflictTarget

fn write_sql(&self, w: &mut SqlWriter<'_>)

Append this fragment to w.

impl HasWhere for ConflictTarget

fn where_mut(&mut self) -> &mut Where

The WHERE clause to modify.