Expand description
A non-owning dynamic type value. Typically the memory backing this value is owned by SQLite.
See Value
for an owning dynamic type value.
Variants
Null
The value is a NULL
value.
Integer(i64)
The value is a signed integer.
Real(f64)
The value is a floating point number.
Text(&'a [u8])
The value is a text string.
Blob(&'a [u8])
The value is a blob of data
Implementations
sourceimpl<'a> ValueRef<'a>
impl<'a> ValueRef<'a>
sourcepub fn as_i64(&self) -> Result<i64, FromSqlError>
pub fn as_i64(&self) -> Result<i64, FromSqlError>
If self
is case Integer
, returns the integral value. Otherwise,
returns [Err(Error::InvalidColumnType)
](crate::Error::
InvalidColumnType).
sourcepub fn as_i64_or_null(&self) -> Result<Option<i64>, FromSqlError>
pub fn as_i64_or_null(&self) -> Result<Option<i64>, FromSqlError>
If self
is case Null
returns None.
If self
is case Integer
, returns the integral value.
Otherwise returns [Err(Error::InvalidColumnType)
](crate::Error::
InvalidColumnType).
sourcepub fn as_f64(&self) -> Result<f64, FromSqlError>
pub fn as_f64(&self) -> Result<f64, FromSqlError>
If self
is case Real
, returns the floating point value. Otherwise,
returns [Err(Error::InvalidColumnType)
](crate::Error::
InvalidColumnType).
sourcepub fn as_f64_or_null(&self) -> Result<Option<f64>, FromSqlError>
pub fn as_f64_or_null(&self) -> Result<Option<f64>, FromSqlError>
If self
is case Null
returns None.
If self
is case Real
, returns the floating point value.
Otherwise returns [Err(Error::InvalidColumnType)
](crate::Error::
InvalidColumnType).
sourcepub fn as_str(&self) -> Result<&'a str, FromSqlError>
pub fn as_str(&self) -> Result<&'a str, FromSqlError>
If self
is case Text
, returns the string value. Otherwise, returns
Err(Error::InvalidColumnType)
.
sourcepub fn as_str_or_null(&self) -> Result<Option<&'a str>, FromSqlError>
pub fn as_str_or_null(&self) -> Result<Option<&'a str>, FromSqlError>
If self
is case Null
returns None.
If self
is case Text
, returns the string value.
Otherwise returns [Err(Error::InvalidColumnType)
](crate::Error::
InvalidColumnType).
sourcepub fn as_blob(&self) -> Result<&'a [u8], FromSqlError>
pub fn as_blob(&self) -> Result<&'a [u8], FromSqlError>
If self
is case Blob
, returns the byte slice. Otherwise, returns
Err(Error::InvalidColumnType)
.
sourcepub fn as_blob_or_null(&self) -> Result<Option<&'a [u8]>, FromSqlError>
pub fn as_blob_or_null(&self) -> Result<Option<&'a [u8]>, FromSqlError>
If self
is case Null
returns None.
If self
is case Blob
, returns the byte slice.
Otherwise returns [Err(Error::InvalidColumnType)
](crate::Error::
InvalidColumnType).
sourcepub fn as_bytes(&self) -> Result<&'a [u8], FromSqlError>
pub fn as_bytes(&self) -> Result<&'a [u8], FromSqlError>
Returns the byte slice that makes up this ValueRef if it’s either
ValueRef::Blob
or ValueRef::Text
.
sourcepub fn as_bytes_or_null(&self) -> Result<Option<&'a [u8]>, FromSqlError>
pub fn as_bytes_or_null(&self) -> Result<Option<&'a [u8]>, FromSqlError>
If self
is case Null
returns None.
If self
is ValueRef::Blob
or ValueRef::Text
returns the byte
slice that makes up this value
Trait Implementations
impl<'a> Copy for ValueRef<'a>
impl<'a> StructuralPartialEq for ValueRef<'a>
Auto Trait Implementations
impl<'a> RefUnwindSafe for ValueRef<'a>
impl<'a> Send for ValueRef<'a>
impl<'a> Sync for ValueRef<'a>
impl<'a> Unpin for ValueRef<'a>
impl<'a> UnwindSafe for ValueRef<'a>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more