Struct Parameters

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pub struct Parameters { /* private fields */ }
Expand description

Generator of PostgreSQL parameter placeholders for dynamic statements with multiple values

§Example

use scooby::postgres::Parameters;

let mut params = Parameters::new();
let p1 = params.next();
let p2 = params.next();
let p345 = params.next_n(3);
let p67 = params.next_array::<2>();

assert_eq!(p1, "$1");
assert_eq!(p2, "$2");
assert_eq!(p345, "$3, $4, $5");
assert_eq!(p67, ["$6", "$7"]);

Implementations§

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impl Parameters

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pub fn new() -> Parameters

Make a new Parameters counter, starting with 1

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pub fn starting_from(first: usize) -> Parameters

Make a new Parameters counter, starting with passed number

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pub fn next(&mut self) -> String

Return the current parameter placeholder in $x format, and increase the internal counter

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pub fn next_n(&mut self, n: usize) -> String

Return N next placeholders in $x, $y, $z format

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pub fn next_array<const N: usize>(&mut self) -> [String; N]

Return N next placeholders as an array of size N

Trait Implementations§

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impl Default for Parameters

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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> 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, 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.