Struct RowAlias 

pub struct RowAlias {
    pub name: Option<Cow<'static, str>>,
    pub columns: Vec<Cow<'static, str>>,
}

AS row_alias [(col_alias, …)], the name an INSERT’s new row is given (MySQL 8.0.19).

It exists so that ON DUPLICATE KEY UPDATE can refer to the incoming values by name instead of through the deprecated VALUES() function:

INSERT INTO t (a, b) VALUES (?, ?) AS `new` ON DUPLICATE KEY UPDATE b = `new`.b

Fields

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

The row alias, quoted on output.

columns: Vec<Cow<'static, str>>

Per-column aliases, quoted on output.

Implementations

impl RowAlias

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

A row alias with no column aliases.

pub fn is_empty(&self) -> bool

Whether there is no alias. Column aliases alone are not a clause: the grammar hangs them off the row alias.

Trait Implementations

impl Clone for RowAlias

fn clone(&self) -> RowAlias

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowAlias

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

Formats the value using the given formatter.

impl Default for RowAlias

fn default() -> RowAlias

Returns the “default value” for a type.

impl Expression for RowAlias

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

Append this fragment to w.

impl HasRowAlias for RowAlias

fn row_alias_mut(&mut self) -> &mut RowAlias

The row alias to set.