Trait FromRow 

pub trait FromRow: Sized {
    // Required method
    fn from_row(row: &ResultRow) -> Result<Self>;
}

Trait for converting a database row into a Rust struct

Implement this trait for your structs to enable automatic mapping from query results using query_as.

Example

use radixdb::{Database, FromRow, ResultRow, Result};

struct User {
    id: i64,
    name: String,
    email: Option<String>,
}

impl FromRow for User {
    fn from_row(row: &ResultRow) -> Result<Self> {
        Ok(User {
            id: row.get(0)?,
            name: row.get(1)?,
            email: row.get(2)?,  // Option<T> handles NULL
        })
    }
}

// Now you can use query_as
let db = Database::open("memory://")?;
let users: Vec<User> = db.query_as("SELECT id, name, email FROM users", ())?;

Using column names

You can also use column names for more robust mapping:

impl FromRow for User {
    fn from_row(row: &ResultRow) -> Result<Self> {
        Ok(User {
            id: row.get_by_name("id")?,
            name: row.get_by_name("name")?,
            email: row.get_by_name("email")?,
        })
    }
}

Required Methods

fn from_row(row: &ResultRow) -> Result<Self>

Convert a result row into Self

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors