Module diesel::prelude [−] [src]

Re-exports important traits and types. Meant to be glob imported when using Diesel.

Reexports

pub use associations::Identifiable;

pub use connection::Connection;

pub use expression::Expression;

pub use expression::SelectableExpression;

pub use expression::AppearsOnTable;

pub use expression::BoxableExpression;

pub use expression_methods::*;

pub use query_source::QuerySource;

pub use query_source::Queryable;

pub use query_source::Table;

pub use query_source::Column;

pub use result::QueryResult;

pub use result::ConnectionError;

pub use result::ConnectionResult;

pub use result::OptionalExtension;

Traits

BelongingToDsl
BoxedDsl	Boxes the pieces of a query into a single type. This is useful for cases where you want to conditionally modify a query, but need the type to remain the same. The backend must be specified as part of this. It is not possible to box a query and have it be useable on multiple backends.
CountDsl	Adds a simple `count` function to queries. Automatically implemented for all types which implement `SelectDsl`.
DistinctDsl	Adds the `DISTINCT` keyword to a query.
ExecuteDsl
FilterDsl	Adds to the `WHERE` clause of a query. If there is already a `WHERE` clause, the result will be `old AND new`. This is automatically implemented for the various query builder types.
FindDsl	Attempts to find a single record from the given table by primary key.
GroupedBy
Insertable	Represents that a structure can be used to to insert a new row into the database. This is automatically implemented for `&[T]` and `&Vec<T>` for inserting more than one record.
JoinDsl
JoinTo	Indicates that two tables can be used together in a JOIN clause. Implementations of this trait will be generated for you automatically by the association annotations from codegen.
LimitDsl	Sets the limit clause of a query. If there was already a limit clause, it will be overridden. This is automatically implemented for the various query builder types.
LoadDsl	Methods to execute a query given a connection. These are automatically implemented for the various query types.
OffsetDsl	Sets the offset clause of a query. If there was already a offset clause, it will be overridden. This is automatically implemented for the various query builder types.
OrderDsl	Sets the order clause of a query. If there was already a order clause, it will be overridden. The expression passed to `order` must actually be valid for the query. See also: `.desc()` and `.asc()`
SaveChangesDsl
SelectDsl	Sets the select clause of a query. If there was already a select clause, it will be overridden. The expression passed to `select` must actually be valid for the query (only contains columns from the target table, doesn't mix aggregate + non-aggregate expressions, etc).