Trait ExtendedHandler 

pub trait ExtendedHandler {
    // Required method
    fn row(&mut self, cols: RowDescription<'_>, row: DataRow<'_>) -> Result<()>;

    // Provided methods
    fn result_start(&mut self, cols: RowDescription<'_>) -> Result<()> { ... }
    fn result_end(&mut self, complete: CommandComplete<'_>) -> Result<()> { ... }
}

Handler for extended query protocol.

Callback patterns by statement type:

• SELECT with rows: result_start → row* → result_end
• SELECT with 0 rows: result_start → result_end
• INSERT/UPDATE/DELETE: result_end only (with affected row count)

Required Methods

fn row(&mut self, cols: RowDescription<'_>, row: DataRow<'_>) -> Result<()>

Called for each data row.

Provided Methods

fn result_start(&mut self, cols: RowDescription<'_>) -> Result<()>

Called when a result set begins.

fn result_end(&mut self, complete: CommandComplete<'_>) -> Result<()>

Called when a result set ends.

Implementors

impl ExtendedHandler for DropHandler

impl<T: for<'a> FromRow<'a>> ExtendedHandler for CollectHandler<T>

impl<T: for<'a> FromRow<'a>> ExtendedHandler for FirstRowHandler<T>

impl<T: for<'a> FromRow<'a>, F: FnMut(T) -> Result<()>> ExtendedHandler for ForEachHandler<T, F>