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SelectQueryBuilder

rust_ef::query

Struct SelectQueryBuilder 

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pub struct SelectQueryBuilder<T: IEntityType> { /* private fields */ }
Expand description

A query builder for projected column results.

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impl<T: IEntityType> SelectQueryBuilder<T>

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pub fn to_sql(&self) -> String

Returns the generated SQL.

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pub async fn to_list(self) -> EFResult<Vec<Vec<DbValue>>>

Executes the projection query and returns raw column values per row.

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pub async fn to_list_typed_1<V0>(self) -> EFResult<Vec<V0>>
where V0: TryFrom<DbValue, Error = DbValueConvertError>,

Single-column typed projection → Vec<V0>.

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pub async fn to_list_typed_2<V0, V1>(self) -> EFResult<Vec<(V0, V1)>>
where V0: TryFrom<DbValue, Error = DbValueConvertError>, V1: TryFrom<DbValue, Error = DbValueConvertError>,

Two-column typed projection → Vec<(V0, V1)>.

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pub async fn to_list_typed_3<V0, V1, V2>(self) -> EFResult<Vec<(V0, V1, V2)>>
where V0: TryFrom<DbValue, Error = DbValueConvertError>, V1: TryFrom<DbValue, Error = DbValueConvertError>, V2: TryFrom<DbValue, Error = DbValueConvertError>,

Three-column typed projection → Vec<(V0, V1, V2)>.

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pub async fn to_list_typed_4<V0, V1, V2, V3>( self, ) -> EFResult<Vec<(V0, V1, V2, V3)>>
where V0: TryFrom<DbValue, Error = DbValueConvertError>, V1: TryFrom<DbValue, Error = DbValueConvertError>, V2: TryFrom<DbValue, Error = DbValueConvertError>, V3: TryFrom<DbValue, Error = DbValueConvertError>,

Four-column typed projection → Vec<(V0, V1, V2, V3)>.

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impl<T: Clone + IEntityType> Clone for SelectQueryBuilder<T>

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fn clone(&self) -> SelectQueryBuilder<T>

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more

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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<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.