Struct SelectBuilder

pub struct SelectBuilder<'a> { /* private fields */ }

Implementations§

Trait Implementations§

Formats the value using the given formatter. Read more

获取一条记录，如果不存在返回 None

获取一个可选标量，如果不存在返回 None

以 map 形式返回全部记录

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

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

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

Should always be Self

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

Struct SelectBuilderCopy item path

Implementations§

impl<'a> SelectBuilder<'a>

pub fn new(table: TableSchema) -> Self

pub fn with_default_schema(self, schema: &'a str) -> Self

pub fn order_by(self, item: Order) -> Self

Trait Implementations§

impl<'a> Debug for SelectBuilder<'a>

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

impl<'a> QueryBuilder<'a> for SelectBuilder<'a>

type DB = Postgres

async fn one<'e, 'c: 'e, E, O>(&self, executor: E) -> Result<O, Error>where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: 'e + FromRow<'r, <Self::DB as Database>::Row> + Send + Unpin,

async fn optional<'e, 'c: 'e, E, O>( &self, executor: E, ) -> Result<Option<O>, Error>where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: 'e + Send + Unpin + FromRow<'r, <Self::DB as Database>::Row>,

async fn all<'e, 'c: 'e, E, O>(&self, executor: E) -> Result<Vec<O>, Error>where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: FromRow<'r, <Self::DB as Database>::Row> + 'e + Send + Unpin,

async fn page<'e, 'c: 'e, E, O>( &self, executor: E, page: &PageRequest, ) -> Result<PageResult<O>, Error>where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: FromRow<'r, <Self::DB as Database>::Row> + 'e + Send + Unpin,

async fn one_scalar<'c, E, O>( &self, executor: E, field: &Column, ) -> Result<O, Error>where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'c + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn optional_scalar<'q, 'c, E, O>( &self, executor: E, field: &'q Column, ) -> Result<Option<O>, Error>where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'c + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn all_scalars<'q, 'c, E, O>( &self, executor: E, field: &'q Column, ) -> Result<Vec<O>, Error>where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'c + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn count<'c, E>(&self, executor: E) -> Result<usize, Error>where E: 'c + Executor<'c, Database = Self::DB>,

async fn page_scalars<'e, 'c: 'e, E, O>( &self, executor: E, field: &'c Column, page: &PageRequest, ) -> Result<PageResult<O>, Error>where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'e + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn map_all<'e, 'c: 'e, E, O, F, K>( &self, executor: E, key_fn: F, ) -> Result<HashMap<K, O>, Error>where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: FromRow<'r, <Self::DB as Database>::Row> + 'e + Send + Unpin, F: Fn(&O) -> K, K: Eq + Hash,

impl<'a> WhereAppend<Condition> for SelectBuilder<'a>

fn and(self, cond: Condition) -> Self

fn or(self, cond: Condition) -> Self

impl<'a> WhereAppend<Where> for SelectBuilder<'a>

fn and(self, wh: Where) -> Self

fn or(self, wh: Where) -> Self

Auto Trait Implementations§

impl<'a> Freeze for SelectBuilder<'a>

impl<'a> RefUnwindSafe for SelectBuilder<'a>

impl<'a> Send for SelectBuilder<'a>

impl<'a> Sync for SelectBuilder<'a>

impl<'a> Unpin for SelectBuilder<'a>

impl<'a> UnwindSafe for SelectBuilder<'a>

Blanket Implementations§

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

fn in_current_span(self) -> Instrumented<Self>

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

fn into(self) -> U

impl<T> IntoEither for T

fn into_either(self, into_left: bool) -> Either<Self, Self>

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>where F: FnOnce(&Self) -> bool,

impl<T> Same for T

type Output = T

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

fn vzip(self) -> V

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

fn with_current_subscriber(self) -> WithDispatch<Self>

impl<T> ErasedDestructor for Twhere T: 'static,

Struct SelectBuilder

async fn one<'e, 'c: 'e, E, O>(&self, executor: E) -> Result<O, Error>
where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: 'e + FromRow<'r, <Self::DB as Database>::Row> + Send + Unpin,

async fn optional<'e, 'c: 'e, E, O>( &self, executor: E, ) -> Result<Option<O>, Error>
where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: 'e + Send + Unpin + FromRow<'r, <Self::DB as Database>::Row>,

async fn all<'e, 'c: 'e, E, O>(&self, executor: E) -> Result<Vec<O>, Error>
where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: FromRow<'r, <Self::DB as Database>::Row> + 'e + Send + Unpin,

async fn page<'e, 'c: 'e, E, O>( &self, executor: E, page: &PageRequest, ) -> Result<PageResult<O>, Error>
where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: FromRow<'r, <Self::DB as Database>::Row> + 'e + Send + Unpin,

async fn one_scalar<'c, E, O>( &self, executor: E, field: &Column, ) -> Result<O, Error>
where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'c + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn optional_scalar<'q, 'c, E, O>( &self, executor: E, field: &'q Column, ) -> Result<Option<O>, Error>
where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'c + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn all_scalars<'q, 'c, E, O>( &self, executor: E, field: &'q Column, ) -> Result<Vec<O>, Error>
where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'c + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn count<'c, E>(&self, executor: E) -> Result<usize, Error>
where E: 'c + Executor<'c, Database = Self::DB>,

async fn page_scalars<'e, 'c: 'e, E, O>( &self, executor: E, field: &'c Column, page: &PageRequest, ) -> Result<PageResult<O>, Error>
where (O,): for<'r> FromRow<'r, <Self::DB as Database>::Row>, E: 'e + Executor<'c, Database = Self::DB>, O: Send + Unpin,

async fn map_all<'e, 'c: 'e, E, O, F, K>( &self, executor: E, key_fn: F, ) -> Result<HashMap<K, O>, Error>
where E: 'e + Executor<'c, Database = Self::DB>, for<'r> O: FromRow<'r, <Self::DB as Database>::Row> + 'e + Send + Unpin, F: Fn(&O) -> K, K: Eq + Hash,

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

impl<T> Borrow<T> for T
where T: ?Sized,

impl<T> BorrowMut<T> for T
where T: ?Sized,

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

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

impl<T> ErasedDestructor for T
where T: 'static,