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Query

post_archiver::query

Trait Query 

Source 
pub trait Query: Sized {
    type Wrapper<T>;
    type Based: AsTable;

    // Required method
    fn query_with_context<T: FromQuery<Based = Self::Based>>(
        self,
        sql: RawSql<T>,
    ) -> Result<Self::Wrapper<T>>;

    // Provided method
    fn query<T: FromQuery<Based = Self::Based>>(
        self,
    ) -> Result<Self::Wrapper<T>> { ... }
}
Available on crate feature utils only.
Expand description

Core query execution trait. Implementors can call .query() to run SQL and retrieve results.

You generally do not implement this trait directly; use the concrete query builders (e.g. PostQuery, AuthorQuery).

The decorator wrappers Paginated, WithTotal, and Sorted all implement this trait by wrapping and delegating.

Required Associated Types§

Source

type Wrapper<T>

The wrapper type for query results. For most builders this is Vec<T>; when wrapped by WithTotal it becomes Totalled<Vec<T>>.

Source

type Based: AsTable

The database table type this query targets.

Required Methods§

Source

fn query_with_context<T: FromQuery<Based = Self::Based>>( self, sql: RawSql<T>, ) -> Result<Self::Wrapper<T>>

Execute the query with an externally supplied RawSql context (typically threaded through decorator layers).

Provided Methods§

Source

fn query<T: FromQuery<Based = Self::Based>>(self) -> Result<Self::Wrapper<T>>

Execute the query with a default empty RawSql context, returning all matching results.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§