postgres-from-row

Derive FromRow to generate a mapping between a struct and postgres rows.

This crate works with postgres by default.

toml [dependencies] postgres_from_row = "0.3.0"

If you want to use it with tokio-postgres, enable it like so:

toml [dependencies] postgres_from_row = { version = "0.3.0", default_features = false, features = ["tokio-postgres"] }

Examples

```rust use postgresfromrow::FromRow;

[derive(FromRow)]

struct Todo { todoid: i32, text: String authorid: i32, }

let row = client.queryone("SELECT todoid, text, author_id FROM todos").unwrap();

// Pass a row with the correct columns. let todo = Todo::from_row(&row);

let row = client.query_one("SELECT foo FROM bar").unwrap();

// Use try_from_row if the operation could fail. let todo = Todo::tryfromrow(&row); assert!(todo.is_err()); ```

Each field need's to implement postgres::types::FromSql, as this will be used to convert a single column to the specified type. If you want to override this behavior and delegate it to a nested structure that also implements FromRow, use #[from_row(flatten)]:

```rust use postgresfromrow::FromRow;

[derive(FromRow)]

struct Todo { todoid: i32, text: String, #[fromrow(flatten)] author: User }

[derive(FromRow)]

struct User { user_id: i32, username: String }

let row = client.queryone("SELECT todoid, text, userid, username FROM todos t, users u WHERE t.authorid = u.userid").unwrap(); let todo = Todo::fromrow(&row); ```