Enum rusqlite::types::ValueRef

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

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

impl ValueRef<'_>

pub fn data_type(&self) -> Type

Returns SQLite fundamental datatype.

impl<'a> ValueRef<'a>

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

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

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)](crate::Error:: InvalidColumnType).

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

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

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)](crate::Error:: InvalidColumnType).

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

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

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)](crate::Error:: InvalidColumnType).

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

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

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)](crate::Error:: InvalidColumnType).

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.

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

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

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for ValueRef<'a>

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

Formats the value using the given formatter.

impl<'a> From<&'a [u8]> for ValueRef<'a>

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

Converts to this type from the input type.

impl<'a> From<&'a Value> for ValueRef<'a>

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

Converts to this type from the input type.

impl<'a> From<&'a str> for ValueRef<'a>

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

Converts to this type from the input type.

impl<'a, T> From<Option<T>> for ValueRef<'a>where T: Into<ValueRef<'a>>,

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

Converts to this type from the input type.

impl From<ValueRef<'_>> for Value

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

Converts to this type from the input type.

impl<'a> PartialEq for ValueRef<'a>

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> Copy for ValueRef<'a>

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