Enum UnaryCondition 

pub enum UnaryCondition<'a> {
    IsNull(Box<Condition<'a>>),
    IsNotNull(Box<Condition<'a>>),
    Exists(Box<Condition<'a>>),
    NotExists(Box<Condition<'a>>),
    Not(Box<Condition<'a>>),
}

This enum represents all available unary conditions.

Variants

IsNull(Box<Condition<'a>>)

Representation of SQL’s “{} IS NULL”

IsNotNull(Box<Condition<'a>>)

Representation of SQL’s “{} IS NOT NULL”

Exists(Box<Condition<'a>>)

Representation of SQL’s “EXISTS {}”

NotExists(Box<Condition<'a>>)

Representation of SQL’s “NOT EXISTS {}”

Not(Box<Condition<'a>>)

Representation of SQL’s “NOT {}”

Trait Implementations

impl<'a> BuildCondition<'a> for UnaryCondition<'a>

fn build_to_writer( &self, writer: &mut impl Write, dialect: DBImpl, lookup: &mut Vec<Value<'a>>, ) -> Result<(), Error>

This method is used to convert a condition to SQL without allocating a dedicated string.

fn build(&self, dialect: DBImpl, lookup: &mut Vec<Value<'a>>) -> String

This method is used to convert a condition to SQL.

impl<'a> Clone for UnaryCondition<'a>

fn clone(&self) -> UnaryCondition<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for UnaryCondition<'a>

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

Formats the value using the given formatter.

impl<'a> PartialEq for UnaryCondition<'a>

fn eq(&self, other: &UnaryCondition<'a>) -> 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<'a> StructuralPartialEq for UnaryCondition<'a>