Trait diesel::query_builder::QueryFragment

pub trait QueryFragment<DB: Backend, SP = NotSpecialized> {
    // Required method
    fn walk_ast<'b>(&'b self, pass: AstPass<'_, 'b, DB>) -> QueryResult<()>;
}

An untyped fragment of SQL.

This may be a complete SQL command (such as an update statement without a RETURNING clause), or a subsection (such as our internal types used to represent a WHERE clause). Implementations of ExecuteDsl and LoadQuery will generally require that this trait be implemented.

Required Methods

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

Walk over this QueryFragment for all passes.

This method is where the actual behavior of an AST node is implemented. This method will contain the behavior required for all possible AST passes. See AstPass for more details.

Trait Implementations

impl<DB> QueryId for dyn QueryFragment<DB>

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.

Implementations on Foreign Types

impl<'a, T, DB> QueryFragment<DB> for &'a T

where DB: Backend, T: QueryFragment<DB> + ?Sized,

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

impl<DB: Backend> QueryFragment<DB> for ()

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, T9: QueryFragment<__DB>, T10: QueryFragment<__DB>, T11: QueryFragment<__DB>, T12: QueryFragment<__DB>, T13: QueryFragment<__DB>, T14: QueryFragment<__DB>, T15: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, T9: QueryFragment<__DB>, T10: QueryFragment<__DB>, T11: QueryFragment<__DB>, T12: QueryFragment<__DB>, T13: QueryFragment<__DB>, T14: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, T9: QueryFragment<__DB>, T10: QueryFragment<__DB>, T11: QueryFragment<__DB>, T12: QueryFragment<__DB>, T13: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, T9: QueryFragment<__DB>, T10: QueryFragment<__DB>, T11: QueryFragment<__DB>, T12: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, T9: QueryFragment<__DB>, T10: QueryFragment<__DB>, T11: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, T9: QueryFragment<__DB>, T10: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, T9: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, T8: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, T7: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, T6: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5, T6)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, T5: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4, T5)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, T4: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3, T4)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, T3: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2, T3)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, T2: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1, T2)

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

impl<T0: QueryFragment<__DB>, T1: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0, T1)

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

impl<T0: QueryFragment<__DB>, __DB: Backend> QueryFragment<__DB> for (T0,)

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

impl<T, DB> QueryFragment<DB> for Option<T>

where DB: Backend, T: QueryFragment<DB>,

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

impl<T, DB> QueryFragment<DB> for Box<T>

where DB: Backend, T: QueryFragment<DB> + ?Sized,

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

Implementors

impl<'a, C> QueryFragment<Pg> for TransactionBuilder<'a, C>

Available on crate feature postgres_backend only.

impl<DB, Inner> QueryFragment<DB> for SqlQuery<Inner>

where DB: Backend + DieselReserveSpecialization, Inner: QueryFragment<DB>,

impl<DB, Query> QueryFragment<DB> for BoxedSqlQuery<'_, DB, Query>

where DB: Backend + DieselReserveSpecialization, Query: QueryFragment<DB>,

impl<DB: Backend> QueryFragment<DB> for now

impl<DB: Backend> QueryFragment<DB> for today

impl<Query, Value, DB> QueryFragment<DB> for UncheckedBind<Query, Value>

where DB: Backend, Query: QueryFragment<DB>, Value: QueryFragment<DB>,

impl<S> QueryFragment<Pg> for Only<S>

where S: QueryFragment<Pg>,

Available on crate feature postgres_backend only.

impl<S, C, DB> QueryFragment<DB> for AliasedField<S, C>

where S: AliasSource, DB: Backend, C: Column<Table = S::Target>,

impl<S, DB> QueryFragment<DB> for Alias<S>

where S: AliasSource, DB: Backend, S::Target: QueryFragment<DB>,

impl<ST, T, DB> QueryFragment<DB> for SqlLiteral<ST, T>

where DB: Backend, T: QueryFragment<DB>,

impl<T> QueryFragment<Pg> for DistinctOnClause<T>

where T: QueryFragment<Pg>,

Available on crate feature postgres_backend only.

impl<T, U, Op, Ret, DB> QueryFragment<DB> for InsertStatement<T, U, Op, Ret>

where DB: Backend + DieselReserveSpecialization, T: Table, T::FromClause: QueryFragment<DB>, U: QueryFragment<DB> + CanInsertInSingleQuery<DB>, Op: QueryFragment<DB>, Ret: QueryFragment<DB>,

impl<T, U, Ret, DB> QueryFragment<DB> for DeleteStatement<T, U, Ret>

where DB: Backend + DieselReserveSpecialization, T: Table, FromClause<T>: QueryFragment<DB>, U: QueryFragment<DB>, Ret: QueryFragment<DB>,

impl<T, U, V, Ret, DB> QueryFragment<DB> for UpdateStatement<T, U, V, Ret>

where DB: Backend + DieselReserveSpecialization, T: Table, T::FromClause: QueryFragment<DB>, U: QueryFragment<DB>, V: QueryFragment<DB>, Ret: QueryFragment<DB>,