Enum ExpressionKind

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pub enum ExpressionKind<'a> {
Show 14 variants Parameterized(Value), Raw(&'a str), Column(Box<Column<'a>>), Table(Box<Table<'a>>), Row(Row<'a>), Selection(Box<Select<'a>>), Function(Box<Function<'a>>), Asterisk(Option<Box<Table<'a>>>), Op(Box<SqlOp<'a>>), ConditionTree(ConditionTree<'a>), Compare(Compare<'a>), Value(Box<Expression<'a>>), Values(Values<'a>), Default,
}
Expand description

An expression we can compare and use in database queries.

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Parameterized(Value)

Anything that we must parameterize before querying

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Raw(&'a str)

Will be rendered as-is to the SQL statement. Carefully escape, if needed.

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Column(Box<Column<'a>>)

A database column

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Table(Box<Table<'a>>)

A database column

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Row(Row<'a>)

Data in a row form, e.g. (1, 2, 3)

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Selection(Box<Select<'a>>)

A nested SELECT or SELECT .. UNION statement

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Function(Box<Function<'a>>)

A database function call

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Asterisk(Option<Box<Table<'a>>>)

A qualified asterisk to a table

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Op(Box<SqlOp<'a>>)

An operation: sum, sub, mul or div.

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ConditionTree(ConditionTree<'a>)

A tree of expressions to evaluate from the deepest value to up

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Compare(Compare<'a>)

A comparison expression

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Value(Box<Expression<'a>>)

A single value, column, row or a nested select

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Values(Values<'a>)

Multiple values

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Default

DEFAULT keyword, e.g. for INSERT INTO ... VALUES (..., DEFAULT, ...)

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impl<'a> Clone for ExpressionKind<'a>

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fn clone(&self) -> ExpressionKind<'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> Debug for ExpressionKind<'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> 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> PartialEq for ExpressionKind<'a>

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fn eq(&self, other: &ExpressionKind<'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> StructuralPartialEq for ExpressionKind<'a>

Auto Trait Implementations§

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impl<'a> Freeze for ExpressionKind<'a>

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impl<'a> RefUnwindSafe for ExpressionKind<'a>

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impl<'a> Send for ExpressionKind<'a>

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impl<'a> Sync for ExpressionKind<'a>

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impl<'a> Unpin for ExpressionKind<'a>

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impl<'a> UnwindSafe for ExpressionKind<'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.