Struct agnes::view::DataView

pub struct DataView { /* fields omitted */ }

A 'view' into a data store. The primary struct for viewing and manipulating data.

Methods

impl DataView

pub fn v<L: IntoFieldList>(&self, s: L) -> DataView

Generate a new subview of this DataView.

pub fn subview<L: IntoFieldList>(&self, s: L) -> Result<DataView>

Generate a new subview of this DataView, generating an error if a specified field does not exist.

pub fn nrows(&self) -> usize

Number of rows in this data view

pub fn nfields(&self) -> usize

Number of fields in this data view

pub fn fieldnames(&self) -> Vec<&String>

Field names in this data view

pub fn rename<T, U>(&mut self, orig: T, new: U) -> Result<()> where
    T: Into<FieldIdent>,
    U: Into<FieldIdent>, 

Rename a field of this DataView.

pub fn merge(&self, other: &DataView) -> Result<DataView>

Merge this DataView with another DataView object, creating a new DataView with the same number of rows and all the fields from both source DataView objects.

pub fn join(&self, other: &DataView, join: Join) -> Result<DataStore>

Combine two DataView objects using specified join, creating a new DataStore object with a subset of records from the two source DataViews according to the join parameters.

Note that since this is creating a new DataStore object, it will be allocated new data to store the contents of the joined DataViews.

impl DataView

pub fn as_fieldview(&self) -> Option<FieldView>

Create a FieldView object from a DataView object, if possible. Typically, use this on DataView objects with only a single field; however, if the DataView object has multiple fields, the first one will be used for this FieldView. Returns None if the DataView has no fields (is empty).

Trait Implementations

impl Debug for DataView

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Clone for DataView

fn clone(&self) -> DataView

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Default for DataView

fn default() -> DataView

Returns the "default value" for a type.

impl From<DataStore> for DataView

fn from(store: DataStore) -> DataView

Performs the conversion.

impl Display for DataView

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

Formats the value using the given formatter.

impl Serialize for DataView

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where
    S: Serializer, 

Serialize this value into the given Serde serializer.