Struct Set 

pub struct Set {
    pub exprs: Vec<Expr>,
}

The assignment list of an UPDATE, or of DO UPDATE / ON DUPLICATE KEY UPDATE.

The SET keyword is not written here, and this is the one clause in the module that does not write its own. The reason is grammatical: MySQL’s INSERT … ON DUPLICATE KEY UPDATE col = val takes exactly this list with no SET in front of it, while UPDATE t SET … and PostgreSQL’s DO UPDATE SET … both need one. Whatever contains the list therefore supplies the keyword.

An assignment is a whole expression rather than a column/value pair, because PostgreSQL’s multi-column form (a, b) = (SELECT x, y FROM …) is one assignment with a row on each side, and a pair could not hold it.

Fields

exprs: Vec<Expr>

The assignments, in order.

Implementations

impl Set

pub fn append_set(&mut self, expr: impl IntoExpr)

Append one assignment.

pub fn append_sets(&mut self, exprs: impl IntoExprList)

Append several assignments.

pub fn is_empty(&self) -> bool

Whether the clause is absent.

Trait Implementations

impl Clone for Set

fn clone(&self) -> Set

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Set

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

Formats the value using the given formatter.

impl Default for Set

fn default() -> Set

Returns the “default value” for a type.

impl Expression for Set

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

Append this fragment to w.

impl HasSet for Set

fn set_mut(&mut self) -> &mut Set

The assignment list to modify.