Struct postgres_large_object::LargeObject

pub struct LargeObject<'a> { /* fields omitted */ }

Represents an open large object.

Methods

impl<'a> LargeObject<'a>

pub fn fd(&self) -> i32

Returns the file descriptor of the opened object.

pub fn truncate(&mut self, len: i64) -> Result<()>

Truncates the object to the specified size.

If len is larger than the size of the object, it will be padded with null bytes to the specified size.

pub fn finish(self) -> Result<()>

Consumes the LargeObject, cleaning up server side state.

Functionally identical to the Drop implementation on LargeObject except that it returns any errors to the caller.

Trait Implementations

impl<'a> Debug for LargeObject<'a>

fn fmt(&self, fmt: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<'a> Drop for LargeObject<'a>

fn drop(&mut self)

Executes the destructor for this type.

impl<'a> Read for LargeObject<'a>

fn read(&mut self, buf: &mut [u8]) -> Result<usize>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

unsafe fn initializer(&self) -> Initializer

🔬 This is a nightly-only experimental API. (read_initializer)

Determines if this Reader can work with buffers of uninitialized memory.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Read all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Read the exact number of bytes required to fill buf.

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

Transforms this Read instance to an [Iterator] over its bytes.

fn chars(self) -> Chars<Self>

🔬 This is a nightly-only experimental API. (io)

the semantics of a partial read/write of where errors happen is currently unclear and may change

Transforms this Read instance to an [Iterator] over [char]s.

fn chain<R>(self, next: R) -> Chain<Self, R> where
    R: Read, 

Creates an adaptor which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

Creates an adaptor which will read at most limit bytes from it.

impl<'a> Write for LargeObject<'a>

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this object, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this write.

fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Write.

impl<'a> Seek for LargeObject<'a>

fn seek(&mut self, pos: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.