Trait FromColumn 

pub trait FromColumn: Sized {
    // Required method
    fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>;
}

Trait for types that can be extracted from a column.

Required Methods

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

Extract value from a row column.

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 FromColumn for Value

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for bool

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for f64

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for i32

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for i64

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for String

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for Vec<f32>

Dense pgvector columns decode into Vec<f32>. The schema-generated client uses this for Vector(N) and HalfVector(N) scalar fields. The underlying driver implements RowRef::get_vector — drivers that don’t have a pgvector binding will surface an unsupported error at query time rather than at compile time.

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for Vec<u8>

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for DateTime<Utc>

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for NaiveDate

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for NaiveDateTime

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for NaiveTime

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for Decimal

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl FromColumn for Uuid

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

impl<T: FromColumn> FromColumn for Option<T>

Blanket impl so every FromColumn type also satisfies FromColumn through Option<T> without each consumer needing a hand-written nullable wrapper — schema-generated enum types can’t write their own impl FromColumn for Option<MyEnum> because of the orphan rule (both Option and FromColumn are foreign from the consumer crate’s perspective).

Uses RowRef::is_null to short-circuit null rows to None; the non-null path delegates to T::from_column. Drivers that had a faster native Option<primitive> path previously now go through this blanket — the extra is_null round-trip is a small per-column cost in exchange for the orphan-rule unblock.

fn from_column(row: &impl RowRef, column: &str) -> Result<Self, RowError>

Implementors