Enum ExprFunc 

pub enum ExprFunc {
    Count(FuncCount),
    LastInsertId(FuncLastInsertId),
}

A function call expression.

Represents aggregate or scalar functions applied to expressions.

Examples

count(*)           // counts all rows
count(field)       // counts non-null values
last_insert_id()   // MySQL: get the last auto-increment ID

Variants

Count(FuncCount)

The count aggregate function.

LastInsertId(FuncLastInsertId)

The LAST_INSERT_ID() function (MySQL-specific).

Returns the first auto-increment ID that was generated for an INSERT statement. When multiple rows are inserted, this returns the ID of the first row.

Trait Implementations

impl Clone for ExprFunc

fn clone(&self) -> ExprFunc

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExprFunc

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

Formats the value using the given formatter.

impl From<ExprFunc> for Expr

fn from(value: ExprFunc) -> Expr

Converts to this type from the input type.

impl From<FuncCount> for ExprFunc

fn from(value: FuncCount) -> ExprFunc

Converts to this type from the input type.

impl From<FuncLastInsertId> for ExprFunc

fn from(value: FuncLastInsertId) -> ExprFunc

Converts to this type from the input type.

impl PartialEq for ExprFunc

fn eq(&self, other: &ExprFunc) -> 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 ExprFunc