Enum Expr 

pub enum Expr {
    Column(String),
    Literal(Literal),
    And(Vec<Expr>),
    Or(Vec<Expr>),
    Not(Box<Expr>),
    Eq(Box<Expr>, Box<Expr>),
    Ne(Box<Expr>, Box<Expr>),
    Gt(Box<Expr>, Box<Expr>),
    Gte(Box<Expr>, Box<Expr>),
    Lt(Box<Expr>, Box<Expr>),
    Lte(Box<Expr>, Box<Expr>),
    In(Box<Expr>, Vec<Literal>),
    NotIn(Box<Expr>, Vec<Literal>),
    IsNull(Box<Expr>),
    IsNotNull(Box<Expr>),
    Like(Box<Expr>, String),
    Contains(Box<Expr>, String),
    InSubquery(Box<Expr>, Box<Select>),
    Exists(Box<Select>),
    NotExists(Box<Select>),
}

A query expression.

Variants

Column(String)

Reference to a table column.

Literal(Literal)

A constant value.

And(Vec<Expr>)

Logical conjunction.

Or(Vec<Expr>)

Logical disjunction.

Not(Box<Expr>)

Logical negation.

Eq(Box<Expr>, Box<Expr>)

Equality.

Ne(Box<Expr>, Box<Expr>)

Inequality.

Gt(Box<Expr>, Box<Expr>)

Greater than.

Gte(Box<Expr>, Box<Expr>)

Greater than or equal.

Lt(Box<Expr>, Box<Expr>)

Less than.

Lte(Box<Expr>, Box<Expr>)

Less than or equal.

In(Box<Expr>, Vec<Literal>)

Membership in a list.

NotIn(Box<Expr>, Vec<Literal>)

Non-membership in a list.

IsNull(Box<Expr>)

IS NULL test.

IsNotNull(Box<Expr>)

IS NOT NULL test.

Like(Box<Expr>, String)

SQL LIKE pattern match (%/_ wildcards).

Contains(Box<Expr>, String)

Case-sensitive substring containment. Equivalent to LIKE '%needle%' but without treating %/_ in the needle as wildcards.

InSubquery(Box<Expr>, Box<Select>)

Membership in the rows produced by a sub-SELECT (its first projected column). The subquery is evaluated against the same execution context, so it may read other tables or materialized CTEs.

Exists(Box<Select>)

EXISTS (subquery) — true when the subquery yields at least one row.

NotExists(Box<Select>)

NOT EXISTS (subquery) — true when the subquery yields no rows.

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<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Expr

fn deserialize<__D>( __deserializer: __D, ) -> Result<Expr, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

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 Serialize for Expr

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Expr