Trait TextHandler 

pub trait TextHandler {
    // 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 simple query results (text format).

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)

For multi-statement queries like "SELECT 1; UPDATE foo SET x=1":

result_start → row* → result_end   // SELECT 1
result_end                          // UPDATE

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 TextHandler for DropHandler

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

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