[−][src]Struct rusqlite::blob::Blob
Handle to an open BLOB.
Methods
impl<'_> Blob<'_>
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pub fn reopen(&mut self, row: i64) -> Result<()>
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Move a BLOB handle to a new row.
Failure
Will return Err
if the underlying SQLite BLOB reopen call fails.
pub fn size(&self) -> i32
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Return the size in bytes of the BLOB.
pub fn close(self) -> Result<()>
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Close a BLOB handle.
Calling close
explicitly is not required (the BLOB will be closed
when the Blob
is dropped), but it is available so you can get any
errors that occur.
Failure
Will return Err
if the underlying SQLite close call fails.
Trait Implementations
impl<'_> Drop for Blob<'_>
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impl<'_> Write for Blob<'_>
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fn write(&mut self, buf: &[u8]) -> Result<usize>
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Write data into a BLOB incrementally. Will return Ok(0)
if the end of
the blob has been reached; consider using Write::write_all(buf)
if you want to get an error if the entirety of the buffer cannot be
written.
This function may only modify the contents of the BLOB; it is not possible to increase the size of a BLOB using this API.
Failure
Will return Err
if the underlying SQLite write call fails.
fn flush(&mut self) -> Result<()>
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fn write_vectored(&mut self, bufs: &[IoVec]) -> Result<usize, Error>
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iovec
)Like write
, except that it writes from a slice of buffers. Read more
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
1.0.0[src]
Attempts to write an entire buffer into this writer. Read more
fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>
1.0.0[src]
Writes a formatted string into this writer, returning any error encountered. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0[src]
Creates a "by reference" adaptor for this instance of Write
. Read more
impl<'_> Seek for Blob<'_>
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impl<'_> Read for Blob<'_>
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fn read(&mut self, buf: &mut [u8]) -> Result<usize>
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Read data from a BLOB incrementally. Will return Ok(0) if the end of the blob has been reached.
Failure
Will return Err
if the underlying SQLite read call fails.
fn read_vectored(&mut self, bufs: &mut [IoVecMut]) -> Result<usize, Error>
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iovec
)Like read
, except that it reads into a slice of buffers. Read more
unsafe fn initializer(&self) -> Initializer
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read_initializer
)Determines if this Read
er can work with buffers of uninitialized memory. Read more
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>
1.0.0[src]
Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>
1.0.0[src]
Read all bytes until EOF in this source, appending them to buf
. Read more
fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>
1.6.0[src]
Read the exact number of bytes required to fill buf
. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0[src]
Creates a "by reference" adaptor for this instance of Read
. Read more
fn bytes(self) -> Bytes<Self>
1.0.0[src]
Transforms this Read
instance to an [Iterator
] over its bytes. Read more
fn chain<R>(self, next: R) -> Chain<Self, R> where
R: Read,
1.0.0[src]
R: Read,
Creates an adaptor which will chain this stream with another. Read more
fn take(self, limit: u64) -> Take<Self>
1.0.0[src]
Creates an adaptor which will read at most limit
bytes from it. Read more
Auto Trait Implementations
Blanket Implementations
impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T> From for T
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impl<T, U> TryFrom for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,