Struct hdbconnect::types::CLob

pub struct CLob(_);

CLob implementation that is used with HdbValue::CLOB.

CLOB fields are supposed to only store ASCII7, but HANA doesn't check this. So the implementation is a mixture of BLOB implementation (the protocol counts bytes, not chars) and NCLOB implementation (the exposed data are chars, not bytes).

Methods

impl CLob

pub fn len(&self) -> HdbResult<usize>

Length of contained String

pub fn is_empty(&self) -> HdbResult<bool>

Is container empty

pub fn max_size(&self) -> usize

Returns the maximum size of the internal buffers.

Tests can verify that this value does not exceed lob_read_size + buf.len().

pub fn into_string(self) -> HdbResult<String>

Returns the contained String.

Trait Implementations

impl Clone for CLob

Important traits for CLob

impl Read for CLob

fn clone(&self) -> CLob

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CLob

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

Formats the value using the given formatter.

impl Read for CLob

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>

Deprecated since 1.27.0

: Use str::from_utf8 instead: https://doc.rust-lang.org/nightly/std/str/struct.Utf8Error.html#examples

🔬 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.