Trait InputParameterMapping

pub trait InputParameterMapping {
    // Required methods
    fn parameter_index_to_column_index(&self, paramteter_index: u16) -> usize;
    fn num_parameters(&self) -> usize;
}

Governs how indices of bound buffers map to the indices of the parameters. If the order of the input buffers matches the order of the placeholders in the SQL statement, then you can just use InOrder as the mapping.

Then using array input parameters to determine the values of placeholders in an SQL statement to be executed the indices of the placeholders and the column buffers may differ. For starters the column buffer indices are zero based, thereas the parameter indices are one based. On top of that more complex mappings can emerge if the same input buffer should be reused to fill in for multiple placeholders. In case the same value would appear in the query twice.

Required Methods

fn parameter_index_to_column_index(&self, paramteter_index: u16) -> usize

fn num_parameters(&self) -> usize

Implementors

impl InputParameterMapping for InOrder