Struct Column 

pub struct Column { /* private fields */ }

Metadata about a column in a result set.

Column carries the three pieces of information the wire protocol’s RowDescription message provides for each result field: the column name, its type OID, and the type modifier that encodes width-specific parameters like NUMERIC(precision, scale) or VARCHAR(n).

The type modifier is essential for decoding types whose wire format depends on declared precision/scale (e.g. NUMERIC, where precision ≤ 18 uses an 8-byte i64 wire form and precision > 18 uses a 16-byte i128 wire form — and in both cases the scale needed to interpret the unscaled integer value lives only in the type modifier). Upper layers construct a SqlType from OID + modifier via crate::types::SqlType::from_oid_and_modifier — using crate::types::SqlType::from_oid alone silently drops precision and scale, causing decoders to default to scale = 0 and corrupt fractional values.

Implementations

impl Column

pub fn name(&self) -> &str

Returns the column name.

pub fn type_oid(&self) -> Oid

Returns the column type OID.

pub fn type_modifier(&self) -> i32

Returns the column’s type modifier (PostgreSQL-style atttypmod).

For NUMERIC columns this encodes precision and scale and is required for correct decode (see crate::types::SqlType::from_oid_and_modifier). For most other types the server sends -1 to indicate “no modifier”.

pub fn format(&self) -> ColumnFormat

Returns the data format for this column.

Trait Implementations

impl Clone for Column

fn clone(&self) -> Column

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Column

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.