Trait FromRow 

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

    // Provided methods
    fn from_rows(result: QueryResult) -> Result<Vec<Self>> { ... }
    fn from_single_row(result: QueryResult) -> Result<Self> { ... }
    fn from_optional_row(result: QueryResult) -> Result<Option<Self>> { ... }
}

Trait for deserializing a row into a Rust type

This trait is implemented by schema types to enable conversion from database rows to strongly-typed structs.

Example

struct User {
    id: Uuid,
    name: String,
    age: i64,
}

impl FromRow for User {
    fn from_row(row: Row) -> Result<Self> {
        Ok(User {
            id: row.get_required("id")?.as_uuid()?,
            name: row.get_required("name")?.as_str()?.to_string(),
            age: row.get_required("age")?.as_i64()?,
        })
    }
}

Required Methods

fn from_row(row: Row) -> Result<Self>

Convert a row into this type

Provided Methods

fn from_rows(result: QueryResult) -> Result<Vec<Self>>

Convert multiple rows into a vector of this type

fn from_single_row(result: QueryResult) -> Result<Self>

Convert a single row result, returning an error if zero or multiple rows

fn from_optional_row(result: QueryResult) -> Result<Option<Self>>

Convert an optional single row result

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl FromRow for bool

fn from_row(row: Row) -> Result<Self>

impl FromRow for f64

fn from_row(row: Row) -> Result<Self>

impl FromRow for i64

fn from_row(row: Row) -> Result<Self>

impl FromRow for String

fn from_row(row: Row) -> Result<Self>

impl FromRow for DateTime<Utc>

fn from_row(row: Row) -> Result<Self>

impl FromRow for Uuid

fn from_row(row: Row) -> Result<Self>

impl<T: FromRow> FromRow for Option<T>

fn from_row(row: Row) -> Result<Self>

Implementors