Struct sqlx::query::Map [−][src]
SQL query that will map its results to owned Rust types.
Returned by Query::try_map, query!(), etc. Has most of the same methods as Query but
the return types are changed to reflect the mapping. However, there is no equivalent of
Query::execute as it doesn't make sense to map the result type and then ignore it.
Query::bind is also omitted; stylistically we recommend placing your .bind() calls
before .try_map(). This is also to prevent adding superfluous binds to the result of
query!() et al.
Implementations
impl<'q, DB, F, O, A> Map<'q, DB, F, A> where
A: 'q + Send + IntoArguments<'q, DB>,
O: Send + Unpin,
F: FnMut(<DB as Database>::Row) -> Result<O, Error> + Send,
DB: Database, [src]
A: 'q + Send + IntoArguments<'q, DB>,
O: Send + Unpin,
F: FnMut(<DB as Database>::Row) -> Result<O, Error> + Send,
DB: Database,
pub fn map<G, P>(
self,
g: G
) -> Map<'q, DB, impl Send + FnMut(<DB as Database>::Row), A> where
P: Unpin,
G: FnMut(O) -> P + Send, [src]
self,
g: G
) -> Map<'q, DB, impl Send + FnMut(<DB as Database>::Row), A> where
P: Unpin,
G: FnMut(O) -> P + Send,
Map each row in the result to another type.
See try_map for a fallible version of this method.
The query_as method will construct a mapped query using
a FromRow implementation.
pub fn try_map<G, P>(
self,
g: G
) -> Map<'q, DB, impl Send + FnMut(<DB as Database>::Row), A> where
P: Unpin,
G: FnMut(O) -> Result<P, Error> + Send, [src]
self,
g: G
) -> Map<'q, DB, impl Send + FnMut(<DB as Database>::Row), A> where
P: Unpin,
G: FnMut(O) -> Result<P, Error> + Send,
Map each row in the result to another type.
The query_as method will construct a mapped query using
a FromRow implementation.
pub fn fetch<'e, 'c, E>(
self,
executor: E
) -> Pin<Box<dyn Stream<Item = Result<O, Error>> + 'e + Send, Global>> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>, [src]
self,
executor: E
) -> Pin<Box<dyn Stream<Item = Result<O, Error>> + 'e + Send, Global>> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>,
Execute the query and return the generated results as a stream.
pub fn fetch_many<'e, 'c, E>(
self,
executor: E
) -> Pin<Box<dyn Stream<Item = Result<Either<<DB as Database>::QueryResult, O>, Error>> + 'e + Send, Global>> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>, [src]
self,
executor: E
) -> Pin<Box<dyn Stream<Item = Result<Either<<DB as Database>::QueryResult, O>, Error>> + 'e + Send, Global>> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>,
Execute multiple queries and return the generated results as a stream from each query, in a stream.
pub async fn fetch_all<'e, 'c, E>(
self,
executor: E
) -> Result<Vec<O, Global>, Error> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>, [src]
self,
executor: E
) -> Result<Vec<O, Global>, Error> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>,
Execute the query and return all the generated results, collected into a Vec.
pub async fn fetch_one<'e, 'c, E>(self, executor: E) -> Result<O, Error> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>, [src]
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>,
Execute the query and returns exactly one row.
pub async fn fetch_optional<'e, 'c, E>(
self,
executor: E
) -> Result<Option<O>, Error> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>, [src]
self,
executor: E
) -> Result<Option<O>, Error> where
'c: 'e,
'q: 'e,
O: 'e,
F: 'e,
DB: 'e,
E: 'e + Executor<'c, Database = DB>,
Execute the query and returns at most one row.
Trait Implementations
impl<'q, DB, F, A> Execute<'q, DB> for Map<'q, DB, F, A> where
A: Send + IntoArguments<'q, DB>,
F: Send,
DB: Database, [src]
A: Send + IntoArguments<'q, DB>,
F: Send,
DB: Database,
pub fn sql(&self) -> &'q str[src]
pub fn statement(&self) -> Option<&<DB as HasStatement<'q>>::Statement>[src]
pub fn take_arguments(&mut self) -> Option<<DB as HasArguments<'q>>::Arguments>[src]
pub fn persistent(&self) -> bool[src]
Auto Trait Implementations
impl<'q, DB, F, A> RefUnwindSafe for Map<'q, DB, F, A> where
A: RefUnwindSafe,
DB: RefUnwindSafe,
F: RefUnwindSafe,
<DB as HasStatement<'q>>::Statement: RefUnwindSafe, [src]
A: RefUnwindSafe,
DB: RefUnwindSafe,
F: RefUnwindSafe,
<DB as HasStatement<'q>>::Statement: RefUnwindSafe,
impl<'q, DB, F, A> Send for Map<'q, DB, F, A> where
A: Send,
F: Send, [src]
A: Send,
F: Send,
impl<'q, DB, F, A> Sync for Map<'q, DB, F, A> where
A: Sync,
DB: Sync,
F: Sync, [src]
A: Sync,
DB: Sync,
F: Sync,
impl<'q, DB, F, A> Unpin for Map<'q, DB, F, A> where
A: Unpin,
DB: Unpin,
F: Unpin, [src]
A: Unpin,
DB: Unpin,
F: Unpin,
impl<'q, DB, F, A> UnwindSafe for Map<'q, DB, F, A> where
A: UnwindSafe,
DB: UnwindSafe,
F: UnwindSafe,
<DB as HasStatement<'q>>::Statement: RefUnwindSafe, [src]
A: UnwindSafe,
DB: UnwindSafe,
F: UnwindSafe,
<DB as HasStatement<'q>>::Statement: RefUnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T[src]
impl<T> Conv for T
impl<T> Conv for T
impl<T> FmtForward for T
pub fn fmt_binary(self) -> FmtBinary<Self> where
Self: Binary,
Self: Binary,
pub fn fmt_display(self) -> FmtDisplay<Self> where
Self: Display,
Self: Display,
pub fn fmt_lower_exp(self) -> FmtLowerExp<Self> where
Self: LowerExp,
Self: LowerExp,
pub fn fmt_lower_hex(self) -> FmtLowerHex<Self> where
Self: LowerHex,
Self: LowerHex,
pub fn fmt_octal(self) -> FmtOctal<Self> where
Self: Octal,
Self: Octal,
pub fn fmt_pointer(self) -> FmtPointer<Self> where
Self: Pointer,
Self: Pointer,
pub fn fmt_upper_exp(self) -> FmtUpperExp<Self> where
Self: UpperExp,
Self: UpperExp,
pub fn fmt_upper_hex(self) -> FmtUpperHex<Self> where
Self: UpperHex,
Self: UpperHex,
impl<T> From<T> for T[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T> Pipe for T where
T: ?Sized,
T: ?Sized,
pub fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
pub fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> R where
R: 'a,
R: 'a,
pub fn pipe_ref_mut<'a, R>(
&'a mut self,
func: impl FnOnce(&'a mut Self) -> R
) -> R where
R: 'a,
&'a mut self,
func: impl FnOnce(&'a mut Self) -> R
) -> R where
R: 'a,
pub fn pipe_borrow<'a, B, R>(&'a self, func: impl FnOnce(&'a B) -> R) -> R where
Self: Borrow<B>,
R: 'a,
B: 'a + ?Sized,
Self: Borrow<B>,
R: 'a,
B: 'a + ?Sized,
pub fn pipe_borrow_mut<'a, B, R>(
&'a mut self,
func: impl FnOnce(&'a mut B) -> R
) -> R where
Self: BorrowMut<B>,
R: 'a,
B: 'a + ?Sized,
&'a mut self,
func: impl FnOnce(&'a mut B) -> R
) -> R where
Self: BorrowMut<B>,
R: 'a,
B: 'a + ?Sized,
pub fn pipe_as_ref<'a, U, R>(&'a self, func: impl FnOnce(&'a U) -> R) -> R where
Self: AsRef<U>,
U: 'a + ?Sized,
R: 'a,
Self: AsRef<U>,
U: 'a + ?Sized,
R: 'a,
pub fn pipe_as_mut<'a, U, R>(
&'a mut self,
func: impl FnOnce(&'a mut U) -> R
) -> R where
Self: AsMut<U>,
U: 'a + ?Sized,
R: 'a,
&'a mut self,
func: impl FnOnce(&'a mut U) -> R
) -> R where
Self: AsMut<U>,
U: 'a + ?Sized,
R: 'a,
pub fn pipe_deref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> R where
Self: Deref<Target = T>,
T: 'a + ?Sized,
R: 'a,
Self: Deref<Target = T>,
T: 'a + ?Sized,
R: 'a,
pub fn pipe_deref_mut<'a, T, R>(
&'a mut self,
func: impl FnOnce(&'a mut T) -> R
) -> R where
Self: DerefMut<Target = T> + Deref,
T: 'a + ?Sized,
R: 'a,
&'a mut self,
func: impl FnOnce(&'a mut T) -> R
) -> R where
Self: DerefMut<Target = T> + Deref,
T: 'a + ?Sized,
R: 'a,
impl<T> Pipe for T
impl<T> PipeAsRef for T
pub fn pipe_as_ref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> R where
Self: AsRef<T>,
T: 'a,
R: 'a,
Self: AsRef<T>,
T: 'a,
R: 'a,
pub fn pipe_as_mut<'a, T, R>(
&'a mut self,
func: impl FnOnce(&'a mut T) -> R
) -> R where
Self: AsMut<T>,
T: 'a,
R: 'a,
&'a mut self,
func: impl FnOnce(&'a mut T) -> R
) -> R where
Self: AsMut<T>,
T: 'a,
R: 'a,
impl<T> PipeBorrow for T
pub fn pipe_borrow<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> R where
Self: Borrow<T>,
T: 'a,
R: 'a,
Self: Borrow<T>,
T: 'a,
R: 'a,
pub fn pipe_borrow_mut<'a, T, R>(
&'a mut self,
func: impl FnOnce(&'a mut T) -> R
) -> R where
Self: BorrowMut<T>,
T: 'a,
R: 'a,
&'a mut self,
func: impl FnOnce(&'a mut T) -> R
) -> R where
Self: BorrowMut<T>,
T: 'a,
R: 'a,
impl<T> PipeDeref for T
pub fn pipe_deref<'a, R>(
&'a self,
func: impl FnOnce(&'a Self::Target) -> R
) -> R where
Self: Deref,
R: 'a,
&'a self,
func: impl FnOnce(&'a Self::Target) -> R
) -> R where
Self: Deref,
R: 'a,
pub fn pipe_deref_mut<'a, R>(
&'a mut self,
func: impl FnOnce(&'a mut Self::Target) -> R
) -> R where
Self: DerefMut,
R: 'a,
&'a mut self,
func: impl FnOnce(&'a mut Self::Target) -> R
) -> R where
Self: DerefMut,
R: 'a,
impl<T> PipeRef for T
pub fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> R where
R: 'a,
R: 'a,
pub fn pipe_mut<'a, R>(&'a mut self, func: impl FnOnce(&'a mut Self) -> R) -> R where
R: 'a,
R: 'a,
impl<T> Same<T> for T
type Output = T
Should always be Self
impl<T> Tap for T
pub fn tap(self, func: impl FnOnce(&Self)) -> Self
pub fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self
pub fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self where
Self: Borrow<B>,
B: ?Sized,
Self: Borrow<B>,
B: ?Sized,
pub fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self where
Self: BorrowMut<B>,
B: ?Sized,
Self: BorrowMut<B>,
B: ?Sized,
pub fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self where
Self: AsRef<R>,
R: ?Sized,
Self: AsRef<R>,
R: ?Sized,
pub fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self where
Self: AsMut<R>,
R: ?Sized,
Self: AsMut<R>,
R: ?Sized,
pub fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self where
Self: Deref<Target = T>,
T: ?Sized,
Self: Deref<Target = T>,
T: ?Sized,
pub fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self where
Self: DerefMut<Target = T> + Deref,
T: ?Sized,
Self: DerefMut<Target = T> + Deref,
T: ?Sized,
pub fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self
pub fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self
pub fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self where
Self: Borrow<B>,
B: ?Sized,
Self: Borrow<B>,
B: ?Sized,
pub fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self where
Self: BorrowMut<B>,
B: ?Sized,
Self: BorrowMut<B>,
B: ?Sized,
pub fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self where
Self: AsRef<R>,
R: ?Sized,
Self: AsRef<R>,
R: ?Sized,
pub fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self where
Self: AsMut<R>,
R: ?Sized,
Self: AsMut<R>,
R: ?Sized,
pub fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self where
Self: Deref<Target = T>,
T: ?Sized,
Self: Deref<Target = T>,
T: ?Sized,
pub fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self where
Self: DerefMut<Target = T> + Deref,
T: ?Sized,
Self: DerefMut<Target = T> + Deref,
T: ?Sized,
impl<T> Tap for T
pub fn tap<F, R>(self, func: F) -> Self where
F: FnOnce(&Self) -> R,
F: FnOnce(&Self) -> R,
pub fn tap_dbg<F, R>(self, func: F) -> Self where
F: FnOnce(&Self) -> R,
F: FnOnce(&Self) -> R,
pub fn tap_mut<F, R>(self, func: F) -> Self where
F: FnOnce(&mut Self) -> R,
F: FnOnce(&mut Self) -> R,
pub fn tap_mut_dbg<F, R>(self, func: F) -> Self where
F: FnOnce(&mut Self) -> R,
F: FnOnce(&mut Self) -> R,
impl<T, U> TapAsRef<U> for T where
U: ?Sized,
U: ?Sized,
pub fn tap_ref<F, R>(self, func: F) -> Self where
Self: AsRef<T>,
F: FnOnce(&T) -> R,
Self: AsRef<T>,
F: FnOnce(&T) -> R,
pub fn tap_ref_dbg<F, R>(self, func: F) -> Self where
Self: AsRef<T>,
F: FnOnce(&T) -> R,
Self: AsRef<T>,
F: FnOnce(&T) -> R,
pub fn tap_ref_mut<F, R>(self, func: F) -> Self where
Self: AsMut<T>,
F: FnOnce(&mut T) -> R,
Self: AsMut<T>,
F: FnOnce(&mut T) -> R,
pub fn tap_ref_mut_dbg<F, R>(self, func: F) -> Self where
Self: AsMut<T>,
F: FnOnce(&mut T) -> R,
Self: AsMut<T>,
F: FnOnce(&mut T) -> R,
impl<T, U> TapBorrow<U> for T where
U: ?Sized,
U: ?Sized,
pub fn tap_borrow<F, R>(self, func: F) -> Self where
Self: Borrow<T>,
F: FnOnce(&T) -> R,
Self: Borrow<T>,
F: FnOnce(&T) -> R,
pub fn tap_borrow_dbg<F, R>(self, func: F) -> Self where
Self: Borrow<T>,
F: FnOnce(&T) -> R,
Self: Borrow<T>,
F: FnOnce(&T) -> R,
pub fn tap_borrow_mut<F, R>(self, func: F) -> Self where
Self: BorrowMut<T>,
F: FnOnce(&mut T) -> R,
Self: BorrowMut<T>,
F: FnOnce(&mut T) -> R,
pub fn tap_borrow_mut_dbg<F, R>(self, func: F) -> Self where
Self: BorrowMut<T>,
F: FnOnce(&mut T) -> R,
Self: BorrowMut<T>,
F: FnOnce(&mut T) -> R,
impl<T> TapDeref for T
pub fn tap_deref<F, R>(self, func: F) -> Self where
Self: Deref,
F: FnOnce(&Self::Target) -> R,
Self: Deref,
F: FnOnce(&Self::Target) -> R,
pub fn tap_deref_dbg<F, R>(self, func: F) -> Self where
Self: Deref,
F: FnOnce(&Self::Target) -> R,
Self: Deref,
F: FnOnce(&Self::Target) -> R,
pub fn tap_deref_mut<F, R>(self, func: F) -> Self where
Self: DerefMut,
F: FnOnce(&mut Self::Target) -> R,
Self: DerefMut,
F: FnOnce(&mut Self::Target) -> R,
pub fn tap_deref_mut_dbg<F, R>(self, func: F) -> Self where
Self: DerefMut,
F: FnOnce(&mut Self::Target) -> R,
Self: DerefMut,
F: FnOnce(&mut Self::Target) -> R,
impl<T> TryConv for T
impl<T> TryConv for T
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,