Struct diesel_dynamic_schema::Column

pub struct Column<T, U, ST> { /* private fields */ }

A database table column. A database table column. This type is created by the column function.

Implementations

impl<T, U, ST> Column<T, U, ST>

pub fn table(&self) -> &T

Gets a reference to the table of the column.

pub fn name(&self) -> &U

Gets the name of the column, as provided on creation.

Trait Implementations

impl<T: Clone, U: Clone, ST: Clone> Clone for Column<T, U, ST>

fn clone(&self) -> Column<T, U, ST>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug, U: Debug, ST: Debug> Debug for Column<T, U, ST>

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

Formats the value using the given formatter.

impl<T, U, ST> Expression for Column<T, U, ST>where ST: TypedExpressionType,

type SqlType = ST

The type that this expression represents in SQL

impl<T: Hash, U: Hash, ST: Hash> Hash for Column<T, U, ST>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T: PartialEq, U: PartialEq, ST: PartialEq> PartialEq<Column<T, U, ST>> for Column<T, U, ST>

fn eq(&self, other: &Column<T, U, ST>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T, U, ST, DB> QueryFragment<DB, NotSpecialized> for Column<T, U, ST>where DB: Backend, T: QueryFragment<DB>, U: Borrow<str>,

fn walk_ast<'b>(&'b self, out: AstPass<'_, 'b, DB>) -> QueryResult<()>

Walk over this QueryFragment for all passes.

fn to_sql( &self, out: &mut <DB as Backend>::QueryBuilder, backend: &DB ) -> Result<(), Error>

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

Converts this QueryFragment to its SQL representation.

fn collect_binds<'b>( &'b self, out: &mut <DB as HasBindCollector<'b>>::BindCollector, metadata_lookup: &mut <DB as TypeMetadata>::MetadataLookup, backend: &'b DB ) -> Result<(), Error>

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

Serializes all bind parameters in this query.

fn is_safe_to_cache_prepared(&self, backend: &DB) -> Result<bool, Error>

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

Is this query safe to store in the prepared statement cache?

fn is_noop(&self, backend: &DB) -> Result<bool, Error>

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

Does walking this AST have any effect?

impl<T, U, ST> QueryId for Column<T, U, ST>

type QueryId = ()

A type which uniquely represents Self in a SQL query.

const HAS_STATIC_QUERY_ID: bool = false

Can the SQL generated by Self be uniquely identified by its type?

fn query_id() -> Option<TypeId>

Returns the type id of Self::QueryId if Self::HAS_STATIC_QUERY_ID. Returns None otherwise.

impl<T, U, ST> ValidGrouping<()> for Column<T, U, ST>

type IsAggregate = No

Is this expression aggregate?

impl<T, U, ST, QS> AppearsOnTable<QS> for Column<T, U, ST>where Self: Expression,

impl<T: Copy, U: Copy, ST: Copy> Copy for Column<T, U, ST>

impl<T: Eq, U: Eq, ST: Eq> Eq for Column<T, U, ST>

impl<T, U, ST, QS> SelectableExpression<QS> for Column<T, U, ST>where Self: Expression,

impl<T, U, ST> StructuralEq for Column<T, U, ST>

impl<T, U, ST> StructuralPartialEq for Column<T, U, ST>