Struct Expression

pub struct Expression<'a> { /* private fields */ }

An expression that can be positioned in a query. Can be a single value or a statement that is evaluated into a value.

Implementations

impl<'a> Expression<'a>

pub fn kind(&self) -> &ExpressionKind<'a>

The type of the expression, dictates how it’s implemented in the query.

Trait Implementations

impl<'a> Add for Expression<'a>

type Output = Expression<'a>

The resulting type after applying the + operator.

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

Performs the + operation.

impl<'a> Aliasable<'a> for Expression<'a>

type Target = Expression<'a>

fn alias<T>(self, alias: T) -> Self::Target

where T: Into<Cow<'a, str>>,

Alias table for usage elsewhere in the query.

impl<'a> Clone for Expression<'a>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Comparable<'a> for Expression<'a>

fn equals<T>(self, comparison: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if both sides are the same value.

fn not_equals<T>(self, comparison: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if both sides are not the same value.

fn less_than<T>(self, comparison: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side is smaller than the right side.

fn less_than_or_equals<T>(self, comparison: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side is smaller than the right side or the same.

fn greater_than<T>(self, comparison: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side is bigger than the right side.

fn greater_than_or_equals<T>(self, comparison: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side is bigger than the right side or the same.

fn in_selection<T>(self, selection: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side is included in the right side collection.

fn not_in_selection<T>(self, selection: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side is not included in the right side collection.

fn like<T>(self, pattern: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side includes the right side string.

fn not_like<T>(self, pattern: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the left side does not include the right side string.

fn is_null(self) -> Compare<'a>

Tests if the left side is NULL.

fn is_not_null(self) -> Compare<'a>

Tests if the left side is not NULL.

fn between<T, V>(self, left: T, right: V) -> Compare<'a>

where T: Into<Expression<'a>>, V: Into<Expression<'a>>,

Tests if the value is between two given values.

fn not_between<T, V>(self, left: T, right: V) -> Compare<'a>

where T: Into<Expression<'a>>, V: Into<Expression<'a>>,

Tests if the value is not between two given values.

fn compare_raw<T, V>(self, raw_comparator: T, right: V) -> Compare<'a>

where T: Into<Cow<'a, str>>, V: Into<Expression<'a>>,

Compares two expressions with a custom operator.

fn array_contains<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the array contains another array.

fn array_contained<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the JSON array contains a value.

fn array_overlaps<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the array overlaps with another array.

fn json_array_not_contains<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the JSON array does not contain a value.

fn json_array_begins_with<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the JSON array starts with a value.

fn json_array_not_begins_with<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the JSON array does not start with a value.

fn json_array_ends_into<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the JSON array ends with a value.

fn json_array_not_ends_into<T>(self, item: T) -> Compare<'a>

where T: Into<Expression<'a>>,

Tests if the JSON array does not end with a value.

fn json_type_equals<T>(self, json_type: T) -> Compare<'a>

where T: Into<JsonType<'a>>,

Tests if the JSON value is of a certain type.

fn json_type_not_equals<T>(self, json_type: T) -> Compare<'a>

where T: Into<JsonType<'a>>,

Tests if the JSON value is not of a certain type.

fn any(self) -> Compare<'a>

Matches at least one elem of a list of values.

fn all(self) -> Compare<'a>

Matches all elem of a list of values.

impl<'a> Debug for Expression<'a>

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

Formats the value using the given formatter.

impl<'a> Div for Expression<'a>

type Output = Expression<'a>

The resulting type after applying the / operator.

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

Performs the / operation.

impl<'a> From<Column<'a>> for Expression<'a>

fn from(col: Column<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Compare<'a>> for Expression<'a>

fn from(cmp: Compare<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<ConditionTree<'a>> for Expression<'a>

fn from(ct: ConditionTree<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<ExpressionKind<'a>> for Expression<'a>

fn from(kind: ExpressionKind<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Function<'a>> for Expression<'a>

fn from(f: Function<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Row<'a>> for Expression<'a>

fn from(value: Row<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Select<'a>> for Expression<'a>

fn from(sel: Select<'a>) -> Expression<'a>

Converts to this type from the input type.

impl<'a> From<SqlOp<'a>> for Expression<'a>

fn from(p: SqlOp<'a>) -> Self

Converts to this type from the input type.

impl<'a, T> From<T> for Expression<'a>

where T: Into<Value>,

fn from(p: T) -> Self

Converts to this type from the input type.

impl<'a> From<Table<'a>> for Expression<'a>

fn from(value: Table<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Values<'a>> for Expression<'a>

fn from(value: Values<'a>) -> Self

Converts to this type from the input type.

impl<'a> Mul for Expression<'a>

type Output = Expression<'a>

The resulting type after applying the * operator.

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

Performs the * operation.

impl<'a> PartialEq for Expression<'a>

fn eq(&self, other: &Expression<'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> Rem for Expression<'a>

type Output = Expression<'a>

The resulting type after applying the % operator.

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

Performs the % operation.

impl<'a> Sub for Expression<'a>

type Output = Expression<'a>

The resulting type after applying the - operator.

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

Performs the - operation.

impl<'a> StructuralPartialEq for Expression<'a>