Struct Expression

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pub struct Expression<'a> { /* private fields */ }
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An expression that can be positioned in a query. Can be a single value or a statement that is evaluated into a value.

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impl<'a> Expression<'a>

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

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

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

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type Output = Expression<'a>

The resulting type after applying the + operator.
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fn add(self, other: Self) -> Self

Performs the + operation. Read more
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impl<'a> Aliasable<'a> for Expression<'a>

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type Target = Expression<'a>

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fn alias<T>(self, alias: T) -> Self::Target
where T: Into<Cow<'a, str>>,

Alias table for usage elsewhere in the query.
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impl<'a> Clone for Expression<'a>

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'a> Comparable<'a> for Expression<'a>

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

Tests if both sides are the same value.
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fn not_equals<T>(self, comparison: T) -> Compare<'a>
where T: Into<Expression<'a>>,

Tests if both sides are not the same value.
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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.
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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.
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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.
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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.
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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.
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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.
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fn like<T>(self, pattern: T) -> Compare<'a>
where T: Into<Expression<'a>>,

Tests if the left side includes the right side string.
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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.
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fn is_null(self) -> Compare<'a>

Tests if the left side is NULL.
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fn is_not_null(self) -> Compare<'a>

Tests if the left side is not NULL.
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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.
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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.
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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.
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fn array_contains<T>(self, item: T) -> Compare<'a>
where T: Into<Expression<'a>>,

Tests if the array contains another array.
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fn array_contained<T>(self, item: T) -> Compare<'a>
where T: Into<Expression<'a>>,

Tests if the JSON array contains a value.
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fn array_overlaps<T>(self, item: T) -> Compare<'a>
where T: Into<Expression<'a>>,

Tests if the array overlaps with another array.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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fn any(self) -> Compare<'a>

Matches at least one elem of a list of values.
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fn all(self) -> Compare<'a>

Matches all elem of a list of values.
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impl<'a> Debug for Expression<'a>

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

Formats the value using the given formatter. Read more
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impl<'a> Div for Expression<'a>

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type Output = Expression<'a>

The resulting type after applying the / operator.
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fn div(self, other: Self) -> Self

Performs the / operation. Read more
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impl<'a> From<Column<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<Compare<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<ConditionTree<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<ExpressionKind<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<Function<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<Row<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<Select<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<SqlOp<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a, T> From<T> for Expression<'a>
where T: Into<Value>,

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fn from(p: T) -> Self

Converts to this type from the input type.
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impl<'a> From<Table<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> From<Values<'a>> for Expression<'a>

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

Converts to this type from the input type.
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impl<'a> Mul for Expression<'a>

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type Output = Expression<'a>

The resulting type after applying the * operator.
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fn mul(self, other: Self) -> Self

Performs the * operation. Read more
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impl<'a> PartialEq for Expression<'a>

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fn eq(&self, other: &Expression<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'a> Rem for Expression<'a>

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type Output = Expression<'a>

The resulting type after applying the % operator.
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fn rem(self, other: Self) -> Self

Performs the % operation. Read more
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impl<'a> Sub for Expression<'a>

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type Output = Expression<'a>

The resulting type after applying the - operator.
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fn sub(self, other: Self) -> Self

Performs the - operation. Read more
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impl<'a> StructuralPartialEq for Expression<'a>

Auto Trait Implementations§

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impl<'a> Freeze for Expression<'a>

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impl<'a> RefUnwindSafe for Expression<'a>

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impl<'a> Send for Expression<'a>

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impl<'a> Sync for Expression<'a>

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impl<'a> Unpin for Expression<'a>

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impl<'a> UnwindSafe for Expression<'a>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<'a, T> Conjunctive<'a> for T
where T: Into<Expression<'a>>,

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fn and<E>(self, other: E) -> ConditionTree<'a>
where E: Into<Expression<'a>>,

Builds an AND condition having self as the left leaf and other as the right.
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fn or<E>(self, other: E) -> ConditionTree<'a>
where E: Into<Expression<'a>>,

Builds an OR condition having self as the left leaf and other as the right.
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fn not(self) -> ConditionTree<'a>

Builds a NOT condition having self as the condition.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.