Enum Expr 

pub enum Expr {
    Source(String),
    Identifier(Ident),
    CompoundIdentifier(Vec<Ident>),
    IndexBy(Vec<Expr>),
    Case {
        operand: Option<Box<Expr>>,
        cases: Vec<CaseWhen>,
        else_result: Option<Box<Expr>>,
    },
    Subquery(Box<Query>),
}

An SQL expression of any type.

Semantics / Type Checking

The parser does not distinguish between expressions of different types (e.g. boolean vs string). The caller is responsible for detecting and validating types as necessary (for example WHERE 1 vs SELECT 1=1) See the README.md for more details.

Equality and Hashing Does not Include Source Locations

The Expr type implements PartialEq and Eq based on the semantic value of the expression (not bitwise comparison). This means that Expr instances that are semantically equivalent but have different spans (locations in the source tree) will compare as equal.

Variants

Source(String)

Direct SQL source

Identifier(Ident)

CompoundIdentifier(Vec<Ident>)

IndexBy(Vec<Expr>)

Case

Fields

operand: Option<Box<Expr>>

cases: Vec<CaseWhen>

else_result: Option<Box<Expr>>

Subquery(Box<Query>)

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl Display for Expr

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

Formats the value using the given formatter.

impl Hash for Expr

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Expr

fn cmp(&self, other: &Expr) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Expr

fn eq(&self, other: &Expr) -> 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 PartialOrd for Expr

fn partial_cmp(&self, other: &Expr) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Expr

impl StructuralPartialEq for Expr