Trait serde_db::de::DeserializableResultset

pub trait DeserializableResultset: Sized {
    type E: From<DeserializationError> + Sized;
    type ROW: DeserializableRow;

    // Required methods
    fn has_multiple_rows(&mut self) -> DeserializationResult<bool>;
    fn next(&mut self) -> DeserializationResult<Option<Self::ROW>>;
    fn number_of_fields(&self) -> usize;
    fn fieldname(&self, field_idx: usize) -> Option<&str>;

    // Provided method
    fn try_into<'de, T>(self) -> Result<T, Self::E>
       where T: Deserialize<'de> { ... }
}

Interface for a database resultset to support deserialization.

Required Associated Types

type E: From<DeserializationError> + Sized

Error type of the database driver.

type ROW: DeserializableRow

Concrete type for the DB row, which must implement DeserializabeRow.

Required Methods

fn has_multiple_rows(&mut self) -> DeserializationResult<bool>

Returns true if more than one row is contained, including eventually not yet fetched rows.

Errors

E.g. fetching can fail.

fn next(&mut self) -> DeserializationResult<Option<Self::ROW>>

Removes the next row and returns it, or None if the result set is empty, or an error.

Errors

E.g. fetching can fail.

fn number_of_fields(&self) -> usize

Returns the number of fields in each (complete) row.

fn fieldname(&self, field_idx: usize) -> Option<&str>

Returns the name of the column at the specified index.

Provided Methods

fn try_into<'de, T>(self) -> Result<T, Self::E>where T: Deserialize<'de>,

A provided method that translates a resultset into a given rust type that implements serde::Deserialize.

The type of the target variable needs to be specified explicitly, so that try_into() can derive the type it needs to serialize into:

#[derive(Deserialize)]
struct MyStruct {
    ...
}
let typed_result: Vec<MyStruct> = resultset.try_into()?;

Errors

An error is produced if deserialization into the target type is not possible, or if fetching fails.

Implementors