Enum Select 

pub enum Select {
    All,
    Fields(Vec<String>),
    Field(String),
}

Field selection for queries.

Variants

All

Select all fields.

Fields(Vec<String>)

Select specific fields.

Field(String)

Select a single field.

Implementations

impl Select

pub fn all() -> Self

Create a selection for all fields.

pub fn fields(fields: impl IntoIterator<Item = impl Into<String>>) -> Self

Create a selection for specific fields.

pub fn field(field: impl Into<String>) -> Self

Create a selection for a single field.

pub fn is_all(&self) -> bool

Check if this selects all fields.

pub fn field_names(&self) -> Vec<&str>

Get the list of field names.

pub fn to_sql(&self) -> String

Generate the SQL column list.

pub fn write_sql(&self, buffer: &mut String)

Write the SQL column list directly to a buffer (zero allocation).

Trait Implementations

impl Clone for Select

fn clone(&self) -> Select

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Select

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

Formats the value using the given formatter.

impl Default for Select

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Select

fn eq(&self, other: &Select) -> 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 Eq for Select

impl StructuralPartialEq for Select