Struct rusqlite::blob::Blob
[−]
[src]
pub struct Blob<'conn> { /* fields omitted */ }
Handle to an open BLOB.
Methods
impl<'conn> Blob<'conn>
[src]
fn reopen(&mut self, row: i64) -> Result<()>
[src]
Move a BLOB handle to a new row.
Failure
Will return Err
if the underlying SQLite BLOB reopen call fails.
fn size(&self) -> i32
[src]
Return the size in bytes of the BLOB.
fn close(self) -> Result<()>
[src]
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<'conn> Read for Blob<'conn>
[src]
fn read(&mut self, buf: &mut [u8]) -> Result<usize>
[src]
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.
unsafe fn initializer(&self) -> Initializer
[src]
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, placing them into 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 chars(self) -> Chars<Self>
[src]
🔬 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. 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
impl<'conn> Write for Blob<'conn>
[src]
fn write(&mut self, buf: &[u8]) -> Result<usize>
[src]
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<()>
[src]
Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
1.0.0[src]
Attempts to write an entire buffer into this write. 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