Struct CopyBinaryEncoder 

pub struct CopyBinaryEncoder { /* private fields */ }

Incremental encoder for a binary-COPY payload.

The encoder owns a growing byte buffer. Construction emits the file header; begin_row, the write_* methods and finish append tuples and the trailer.

Implementations

impl CopyBinaryEncoder

pub fn new() -> Self

New encoder — emits signature + 4-byte flags(0) + 4-byte header extension length(0).

pub fn begin_row(&mut self, field_count: i16)

Start a row with field_count fields (i16 BE).

pub fn write_field_bytes(&mut self, bytes: &[u8])

Write a non-null field: i32 BE length prefix + raw bytes.

pub fn write_null(&mut self)

Write a NULL field: i32 BE -1.

pub fn finish(self) -> Vec<u8>

Finish: append i16 BE -1 trailer, return the payload.

pub fn len(&self) -> usize

Current length of the in-progress payload in bytes.

pub fn is_empty(&self) -> bool

Returns true when the underlying buffer is empty.

After new this is always false because the constructor has already emitted the 19-byte file header.

Trait Implementations

impl Default for CopyBinaryEncoder

fn default() -> Self

Returns the “default value” for a type.