Struct butane_core::query::Query

pub struct Query<T: DataResult> { /* fields omitted */ }

Representation of a database query.

Implementations

impl<T: DataResult> Query<T>

pub fn new(table: &'static str) -> Query<T>

Creates a query which matches all objects in table. The set of matched objects can be restricted with filter and limit.

pub fn filter(mut self: Self, expr: BoolExpr) -> Query<T>

Restricts the query to matching only objects for which expr is true. Returns self as this method is expected to be chained.

pub fn limit(mut self: Self, lim: i32) -> Query<T>

Limits the query to matching the first lim objects. Returns self as this method is expected to be chained.

pub fn load_first(self, conn: &impl ConnectionMethods) -> Result<Option<T>>

Executes the query against conn and returns the first result (if any).

pub fn load(self, conn: &impl ConnectionMethods) -> Result<QueryResult<T>>

Executes the query against conn.

pub fn delete(self, conn: &impl ConnectionMethods) -> Result<usize>

Executes the query against conn and deletes all matching objects.

Trait Implementations

impl<T: Clone + DataResult> Clone for Query<T>

pub fn clone(&self) -> Query<T>

Returns a copy of the value.

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

Performs copy-assignment from source.