Enum Predicate 

pub enum Predicate {
    Eq(ColumnName, PredicateValue),
    Lt(ColumnName, PredicateValue),
    Le(ColumnName, PredicateValue),
    Gt(ColumnName, PredicateValue),
    Ge(ColumnName, PredicateValue),
    In(ColumnName, Vec<PredicateValue>),
    Like(ColumnName, String),
    IsNull(ColumnName),
    IsNotNull(ColumnName),
    Or(Vec<Predicate>, Vec<Predicate>),
}

A comparison predicate from the WHERE clause.

Variants

Eq(ColumnName, PredicateValue)

column = value or column = $N

Lt(ColumnName, PredicateValue)

column < value

Le(ColumnName, PredicateValue)

column <= value

Gt(ColumnName, PredicateValue)

column > value

Ge(ColumnName, PredicateValue)

column >= value

In(ColumnName, Vec<PredicateValue>)

column IN (value, value, …)

Like(ColumnName, String)

column LIKE ‘pattern’

IsNull(ColumnName)

column IS NULL

IsNotNull(ColumnName)

column IS NOT NULL

Or(Vec<Predicate>, Vec<Predicate>)

OR of multiple predicates

Implementations

impl Predicate

pub fn column(&self) -> Option<&ColumnName>

Returns the column name this predicate operates on.

Returns None for OR predicates which may reference multiple columns.

Trait Implementations

impl Clone for Predicate

fn clone(&self) -> Predicate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Predicate

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

Formats the value using the given formatter.