Method query_map

src/sql.rs:352–371

Prepares and executes the statement and maps a function over the resulting rows. Then executes the second function over the returned iterator and returns the result of that function.

(
        &self,
        sql: &str,
        params: impl rusqlite::Params + Send,
        f: F,
        g: G,
    )

    /// Then executes the second function over the returned iterator and returns the
    /// result of that function.
    pub async fn query_map<T, F, G, H>(
        &self,
        sql: &str,
        params: impl rusqlite::Params + Send,
        f: F,
        g: G,
    ) -> Result<H>
    where
        F: Send + FnMut(&rusqlite::Row) -> Result<T>,
        G: Send + FnOnce(rusqlite::AndThenRows<F>) -> Result<H>,
        H: Send + 'static,
    {
        let query_only = true;
        self.call(query_only, move |conn| {
            let mut stmt = conn.prepare(sql)?;
            let res = stmt.query_and_then(params, f)?;
            g(res)
        })
        .await
    }

    /// Prepares and executes the statement and maps a function over the resulting rows.
    ///