Struct Column

pub struct Column { /* private fields */ }

A single value returned from a query.

SQLite automatically converts between data types on request, which is why many of the methods require &mut.

Implementations

impl Column

pub fn name(&self) -> Result<&str>

Returns the value of the AS clause for this column, if one was specified. If no AS clause was specified, the name of the column is unspecified and may change from one release of SQLite to the next.

pub fn database_name(&self) -> Result<Option<&str>>

Returns the original, unaliased name of the database that is the origin of this column.

pub fn table_name(&self) -> Result<Option<&str>>

Returns the original, unaliased name of the table that is the origin of this column.

pub fn origin_name(&self) -> Result<Option<&str>>

Returns the original, unaliased name of the column that is the origin of this column.

pub fn decltype(&self) -> Result<Option<&str>>

Returns the declared type of the column that is the origin of this column. Note that this does not mean that values contained in this column comply with the declared type.

Trait Implementations

impl AsMut<ValueRef> for Column

fn as_mut(&mut self) -> &mut ValueRef

Converts this type into a mutable reference of the (usually inferred) input type.

impl AsRef<ValueRef> for Column

fn as_ref(&self) -> &ValueRef

Converts this type into a shared reference of the (usually inferred) input type.

impl Debug for Column

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

Formats the value using the given formatter.

impl FromValue for Column

fn value_type(&self) -> ValueType

Returns the data type of the ValueRef. Note that calling get methods on the ValueRef may cause a conversion to a different data type, but this is not guaranteed.

fn get_i32(&self) -> i32

Interpret this value as i32.

fn get_i64(&self) -> i64

Interpret this value as i64.

fn get_f64(&self) -> f64

Interpret this value as f64.

unsafe fn get_blob_unchecked(&self) -> &[u8]

Get the bytes of this BLOB value.

fn get_blob(&mut self) -> Result<&[u8]>

Interpret this value as a BLOB.

fn is_null(&self) -> bool

Convenience method equivalent to self.value_type() == ValueType::Null.

fn try_get_blob(&self) -> Result<&[u8]>

Attempt to interpret this value as a BLOB, without converting. If the underlying data type is not a BLOB, this function will fail with Err(SQLITE_MISMATCH).

unsafe fn get_str_unchecked(&self) -> Result<&str>

Get the underlying TEXT value.

fn get_str(&mut self) -> Result<&str>

Interpret the value as TEXT.

fn try_get_str(&self) -> Result<&str>

Attempt to interpret this value as TEXT, without converting. If the underlying data type is not TEXT, this function will fail with Err(SQLITE_MISMATCH). This function can also fail if the string has invalid UTF-8.

fn to_owned(&self) -> Result<Value>

Clone the value, returning a Value.