Struct diesel_dynamic_schema::dynamic_value::DynamicRow

pub struct DynamicRow<I> { /* private fields */ }

A dynamically sized container that allows to receive a not at compile time known number of columns from the database

Implementations

impl<I> DynamicRow<I>

pub fn get(&self, index: usize) -> Option<&I>

Get the field value at the provided row index

Returns None if the index is outside the bounds of the row

pub fn len(&self) -> usize

Get the number of fields in the current row

pub fn is_empty(&self) -> bool

Check if the current row is empty

pub fn from_row<'a, DB>(row: &impl Row<'a, DB>) -> Result<Self>where DB: Backend, I: FromSql<Any, DB>,

Create a new dynamic row from an existing database row

This function is mostly useful for third party backends adding support for diesel_dynamic_schema

impl<I> DynamicRow<NamedField<I>>

pub fn get_by_name<S: AsRef<str>>(&self, name: S) -> Option<&I>

Get the field value by the provided field name

Returns None if the field with the specified name is not found. If there are multiple fields with the same name, the behaviour of this function is unspecified.

impl<I> DynamicRow<NamedField<Option<I>>>

pub fn from_nullable_row<'a, DB>(row: &impl Row<'a, DB>) -> Result<Self>where DB: Backend, I: FromSql<Any, DB>,

Create a new dynamic row instance with corresponding field information from the given database row

This function is mostly useful for third party backends adding support for diesel_dynamic_schema

Trait Implementations

impl<I: Debug> Debug for DynamicRow<I>

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

Formats the value using the given formatter.

impl<I> FromIterator<I> for DynamicRow<I>

fn from_iter<T>(iter: T) -> Selfwhere T: IntoIterator<Item = I>,

Creates a value from an iterator.

impl<'a, I> Index<&'a String> for DynamicRow<NamedField<I>>

type Output = I

The returned type after indexing.

fn index(&self, field_name: &'a String) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<'a, I> Index<&'a str> for DynamicRow<NamedField<I>>

type Output = I

The returned type after indexing.

fn index(&self, field_name: &'a str) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<I> Index<String> for DynamicRow<NamedField<I>>

type Output = I

The returned type after indexing.

fn index(&self, field_name: String) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<I> Index<usize> for DynamicRow<I>

type Output = I

The returned type after indexing.

fn index(&self, index: usize) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<'a, V> IntoIterator for &'a DynamicRow<V>

type Item = &'a V

The type of the elements being iterated over.

type IntoIter = <&'a Vec<V, Global> as IntoIterator>::IntoIter

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<V> IntoIterator for DynamicRow<V>

type Item = V

The type of the elements being iterated over.

type IntoIter = <Vec<V, Global> as IntoIterator>::IntoIter

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<I, DB> QueryableByName<DB> for DynamicRow<NamedField<I>>where DB: Backend, I: FromSql<Any, DB>,

fn build<'a>(row: &impl NamedRow<'a, DB>) -> Result<Self>

Construct an instance of Self from the database row

impl<I, DB> QueryableByName<DB> for DynamicRow<Option<I>>where DB: Backend, I: FromSql<Any, DB>,

fn build<'a>(row: &impl NamedRow<'a, DB>) -> Result<Self>

Construct an instance of Self from the database row