Enum rusqlite::types::ValueRef

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pub enum ValueRef<'a> {
    Null,
    Integer(i64),
    Real(f64),
    Text(&'a [u8]),
    Blob(&'a [u8]),
}
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§

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Null

The value is a NULL value.

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Integer(i64)

The value is a signed integer.

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Real(f64)

The value is a floating point number.

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Text(&'a [u8])

The value is a text string.

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Blob(&'a [u8])

The value is a blob of data

Implementations§

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impl ValueRef<'_>

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pub fn data_type(&self) -> Type

Returns SQLite fundamental datatype.

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impl<'a> ValueRef<'a>

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pub fn as_i64(&self) -> FromSqlResult<i64>

If self is case Integer, returns the integral value. Otherwise, returns Err(Error::InvalidColumnType).

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pub fn as_i64_or_null(&self) -> FromSqlResult<Option<i64>>

If self is case Null returns None. If self is case Integer, returns the integral value. Otherwise returns Err(Error::InvalidColumnType).

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pub fn as_f64(&self) -> FromSqlResult<f64>

If self is case Real, returns the floating point value. Otherwise, returns Err(Error::InvalidColumnType).

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pub fn as_f64_or_null(&self) -> FromSqlResult<Option<f64>>

If self is case Null returns None. If self is case Real, returns the floating point value. Otherwise returns Err(Error::InvalidColumnType).

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pub fn as_str(&self) -> FromSqlResult<&'a str>

If self is case Text, returns the string value. Otherwise, returns Err(Error::InvalidColumnType).

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pub fn as_str_or_null(&self) -> FromSqlResult<Option<&'a str>>

If self is case Null returns None. If self is case Text, returns the string value. Otherwise returns Err(Error::InvalidColumnType).

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pub fn as_blob(&self) -> FromSqlResult<&'a [u8]>

If self is case Blob, returns the byte slice. Otherwise, returns Err(Error::InvalidColumnType).

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pub fn as_blob_or_null(&self) -> FromSqlResult<Option<&'a [u8]>>

If self is case Null returns None. If self is case Blob, returns the byte slice. Otherwise returns Err(Error::InvalidColumnType).

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pub fn as_bytes(&self) -> FromSqlResult<&'a [u8]>

Returns the byte slice that makes up this ValueRef if it’s either ValueRef::Blob or ValueRef::Text.

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pub fn as_bytes_or_null(&self) -> FromSqlResult<Option<&'a [u8]>>

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§

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impl<'a> Clone for ValueRef<'a>

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fn clone(&self) -> ValueRef<'a>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'a> Debug for ValueRef<'a>

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

Formats the value using the given formatter. Read more
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impl<'a> From<&'a [u8]> for ValueRef<'a>

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fn from(s: &[u8]) -> ValueRef<'_>

Converts to this type from the input type.
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impl<'a> From<&'a Value> for ValueRef<'a>

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fn from(value: &'a Value) -> ValueRef<'a>

Converts to this type from the input type.
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impl<'a> From<&'a str> for ValueRef<'a>

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fn from(s: &str) -> ValueRef<'_>

Converts to this type from the input type.
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impl<'a, T> From<Option<T>> for ValueRef<'a>
where T: Into<ValueRef<'a>>,

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fn from(s: Option<T>) -> ValueRef<'a>

Converts to this type from the input type.
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impl From<ValueRef<'_>> for Value

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fn from(borrowed: ValueRef<'_>) -> Value

Converts to this type from the input type.
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impl<'a> PartialEq for ValueRef<'a>

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fn eq(&self, other: &ValueRef<'a>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'a> Copy for ValueRef<'a>

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impl<'a> StructuralPartialEq for ValueRef<'a>

Auto Trait Implementations§

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impl<'a> Freeze for ValueRef<'a>

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impl<'a> RefUnwindSafe for ValueRef<'a>

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impl<'a> Send for ValueRef<'a>

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impl<'a> Sync for ValueRef<'a>

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impl<'a> Unpin for ValueRef<'a>

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impl<'a> UnwindSafe for ValueRef<'a>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.