Struct diesel::expression::SqlLiteral

#[must_use = "Queries are only executed when calling `load`, `get_result`, or similar."]
pub struct SqlLiteral<ST, T = ()> { /* fields omitted */ }

Returned by the sql() function.

Methods

impl<ST, T> SqlLiteral<ST, T>

pub fn bind<BindST, U>(
    self,
    bind_value: U
) -> UncheckedBind<Self, U::Expression> where
    U: AsExpression<BindST>, 

Bind a value for use with this SQL query.

Safety

This function should be used with care, as Diesel cannot validate that the value is of the right type nor can it validate that you have passed the correct number of parameters.

Examples

let seans_id = users
    .select(id)
    .filter(sql("name = ").bind::<Text, _>("Sean"))
    .get_result(&connection);
assert_eq!(Ok(1), seans_id);

let tess_id = sql::<Integer>("SELECT id FROM users WHERE name = ")
    .bind::<Text, _>("Tess")
    .get_result(&connection);
assert_eq!(Ok(2), tess_id);

Multiple Bind Params

let query = users
    .select(name)
    .filter(
        sql("id > ")
        .bind::<Integer,_>(1)
        .sql(" AND name <> ")
        .bind::<Text, _>("Ryan")
    )
    .get_results(&connection);
let expected = vec!["Tess".to_string()];
assert_eq!(Ok(expected), query);

pub fn sql(self, sql: &str) -> SqlLiteral<ST, Self>

Use literal SQL in the query builder

This function is intended for use when you need a small bit of raw SQL in your query. If you want to write the entire query using raw SQL, use sql_query instead.

Safety

This function should be used with care, as Diesel cannot validate that the value is of the right type nor can it validate that you have passed the correct number of parameters.

Examples

let query = users
    .select(name)
    .filter(
        sql("id > 1")
        .sql(" AND name <> 'Ryan'")
    )
    .get_results(&connection);
let expected = vec!["Tess".to_string()];
assert_eq!(Ok(expected), query);

Trait Implementations

impl<ST: Debug, T: Debug> Debug for SqlLiteral<ST, T>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<ST: Clone, T: Clone> Clone for SqlLiteral<ST, T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<ST, T> Expression for SqlLiteral<ST, T>

type SqlType = ST

The type that this expression represents in SQL

impl<ST, T, DB> QueryFragment<DB> for SqlLiteral<ST, T> where
    DB: Backend,
    T: QueryFragment<DB>, 

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

Walk over this QueryFragment for all passes.

fn to_sql(&self, out: &mut DB::QueryBuilder) -> QueryResult<()>

Converts this QueryFragment to its SQL representation.

fn collect_binds(
    &self,
    out: &mut DB::BindCollector,
    metadata_lookup: &DB::MetadataLookup
) -> QueryResult<()>

Serializes all bind parameters in this query.

fn is_safe_to_cache_prepared(&self) -> QueryResult<bool>

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

impl<ST, T> QueryId for SqlLiteral<ST, T>

type QueryId = ()

A type which uniquely represents Self in a SQL query.

const HAS_STATIC_QUERY_ID: bool

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<ST, T> Query for SqlLiteral<ST, T>

type SqlType = ST

The SQL type that this query represents.

impl<ST, T, Conn> RunQueryDsl<Conn> for SqlLiteral<ST, T>

fn execute(self, conn: &Conn) -> QueryResult<usize> where
    Conn: Connection,
    Self: ExecuteDsl<Conn>, 

Executes the given command, returning the number of rows affected.

fn load<U>(self, conn: &Conn) -> QueryResult<Vec<U>> where
    Self: LoadQuery<Conn, U>, 

Executes the given query, returning a Vec with the returned rows.

fn get_result<U>(self, conn: &Conn) -> QueryResult<U> where
    Self: LoadQuery<Conn, U>, 

Runs the command, and returns the affected row.

fn get_results<U>(self, conn: &Conn) -> QueryResult<Vec<U>> where
    Self: LoadQuery<Conn, U>, 

Runs the command, returning an Vec with the affected rows.

fn first<U>(self, conn: &Conn) -> QueryResult<U> where
    Self: LimitDsl,
    Limit<Self>: LoadQuery<Conn, U>, 

Attempts to load a single record.

impl<QS, ST, T> SelectableExpression<QS> for SqlLiteral<ST, T>

impl<QS, ST, T> AppearsOnTable<QS> for SqlLiteral<ST, T>

impl<ST, T> NonAggregate for SqlLiteral<ST, T>