Struct NullValue 

pub struct NullValue;

Trait Implementations

impl Clone for NullValue

fn clone(&self) -> NullValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Value for NullValue

fn literal(&self) -> String

Return the literal representation for this Value

fn equals(&self, other: &Box<dyn Value>) -> bool

Return if other Value is equal or not to current value

fn compare(&self, _other: &Box<dyn Value>) -> Option<Ordering>

Return the order between Value and the current value, or None if they can’t be ordered

fn data_type(&self) -> Box<dyn DataType>

Return the DataType for the current Value

fn as_any(&self) -> &dyn Any

Return the current value as dynamic Any

fn add_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary = operator and return new Value represent the result or Exception message as String

fn sub_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary - operator and return new Value represent the result or Exception message as String

fn mul_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary * operator and return new Value represent the result or Exception message as String

fn div_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary / operator and return new Value represent the result or Exception message as String

fn rem_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary % operator and return new Value represent the result or Exception message as String

fn caret_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary ^ operator and return new Value represent the result or Exception message as String

fn or_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary | operator and return new Value represent the result or Exception message as String

fn and_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary & operator and return new Value represent the result or Exception message as String

fn xor_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary # operator and return new Value represent the result or Exception message as String

fn logical_or_op( &self, other: &Box<dyn Value>, ) -> Result<Box<dyn Value>, String>

Perform unary || or OR operator and return new Value represent the result or Exception message as String

fn logical_and_op( &self, other: &Box<dyn Value>, ) -> Result<Box<dyn Value>, String>

Perform unary && or AND operator and return new Value represent the result or Exception message as String

fn logical_xor_op( &self, other: &Box<dyn Value>, ) -> Result<Box<dyn Value>, String>

Perform unary XOR operator and return new Value represent the result or Exception message as String

fn shl_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary << operator and return new Value represent the result or Exception message as String

fn shr_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary >> operator and return new Value represent the result or Exception message as String

fn index_op(&self, index: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary [I] operator and return new Value represent the result or Exception message as String

fn slice_op( &self, start: &Option<Box<dyn Value>>, end: &Option<Box<dyn Value>>, ) -> Result<Box<dyn Value>, String>

Perform unary [S:E] operator and return new Value represent the result or Exception message as String

fn eq_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary = operator and return new Value represent the result or Exception message as String

fn group_eq_op( &self, other: &Box<dyn Value>, group_op: &GroupComparisonOperator, ) -> Result<Box<dyn Value>, String>

Perform unary = [ALL|ANY|SOME] operator and return new Value represent the result or Exception message as String

fn bang_eq_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary != or <> operator and return new Value represent the result or Exception message as String

fn group_bang_eq_op( &self, other: &Box<dyn Value>, group_op: &GroupComparisonOperator, ) -> Result<Box<dyn Value>, String>

Perform unary != or <> [ALL|ANY|SOME] operator and return new Value represent the result or Exception message as String

fn null_safe_eq_op( &self, other: &Box<dyn Value>, ) -> Result<Box<dyn Value>, String>

Perform unary <=> operator and return new Value represent the result or Exception message as String

fn group_null_safe_eq_op( &self, other: &Box<dyn Value>, group_op: &GroupComparisonOperator, ) -> Result<Box<dyn Value>, String>

Perform unary <=> [ALL|ANY|SOME] operator and return new Value represent the result or Exception message as String

fn gt_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary > operator and return new Value represent the result or Exception message as String

fn group_gt_op( &self, other: &Box<dyn Value>, group_op: &GroupComparisonOperator, ) -> Result<Box<dyn Value>, String>

Perform unary > [ALL|ANY|SOME] operator and return new Value represent the result or Exception message as String

fn gte_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary >= operator and return new Value represent the result or Exception message as String

fn group_gte_op( &self, other: &Box<dyn Value>, group_op: &GroupComparisonOperator, ) -> Result<Box<dyn Value>, String>

Perform unary >= [ALL|ANY|SOME] operator and return new Value represent the result or Exception message as String

fn lt_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary < operator and return new Value represent the result or Exception message as String

fn group_lt_op( &self, other: &Box<dyn Value>, group_op: &GroupComparisonOperator, ) -> Result<Box<dyn Value>, String>

Perform unary < [ALL|ANY|SOME] operator and return new Value represent the result or Exception message as String

fn lte_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform unary <= operator and return new Value represent the result or Exception message as String

fn group_lte_op( &self, other: &Box<dyn Value>, group_op: &GroupComparisonOperator, ) -> Result<Box<dyn Value>, String>

Perform unary <= [ALL|ANY|SOME] operator and return new Value represent the result or Exception message as String

fn not_op(&self) -> Result<Box<dyn Value>, String>

Perform unary NOT operator and return new Value represent the result or Exception message as String

fn plus_op(&self) -> Result<Box<dyn Value>, String>

Perform unary + operator and return new Value represent the result or Exception message as String

fn neg_op(&self) -> Result<Box<dyn Value>, String>

Perform unary - operator and return new Value represent the result or Exception message as String

fn bang_op(&self) -> Result<Box<dyn Value>, String>

Perform unary ! operator and return new Value represent the result or Exception message as String

fn contains_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform @> operator and return new Value represent the result or Exception message as String

fn like_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform LIKE operator and return new Value represent the result or Exception message as String

fn glob_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform GLOB operator and return new Value represent the result or Exception message as String

fn regexp_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String>

Perform REGEXP operator and return new Value represent the result or Exception message as String

fn cast_op( &self, target_type: &Box<dyn DataType>, ) -> Result<Box<dyn Value>, String>

Perform Cast operator and return new Value represent the result or Exception message as String