Struct ResultSet 

pub struct ResultSet {
    pub results: Vec<CustomDbRow>,
    pub rows_affected: usize,
    /* private fields */
}

A result set from a database query

This struct represents the result of a database query, containing the rows returned by the query and metadata.

Fields

results: Vec<CustomDbRow>

The rows returned by the query

rows_affected: usize

The number of rows affected (for DML statements)

Implementations

impl ResultSet

pub fn with_capacity(capacity: usize) -> ResultSet

Create a new result set with a known capacity

Arguments

• capacity - The initial capacity for the result rows

Returns

A new ResultSet instance with preallocated capacity

pub fn set_column_names(&mut self, column_names: Arc<Vec<String>>)

Set the column names for this result set (to be shared by all rows)

pub fn get_column_names(&self) -> Option<&Arc<Vec<String>>>

Get the column names for this result set

pub fn add_row_values(&mut self, row_values: Vec<RowValues>)

Add a row to the result set

Arguments

• row_values - The values for this row

pub fn add_row(&mut self, row: CustomDbRow)

Add a row to the result set (legacy method, less efficient)

Arguments

• row - The row to add

pub fn into_optional(self) -> Option<CustomDbRow>

Return the first row, if one was returned.

pub fn into_one(self) -> Result<CustomDbRow, SqlMiddlewareDbError>

Return the first row or an error when the result set is empty.

Errors

Returns SqlMiddlewareDbError::ExecutionError if no row was returned.

pub fn map_optional<T, F>( self, mapper: F, ) -> Result<Option<T>, SqlMiddlewareDbError>

where F: FnOnce(&CustomDbRow) -> Result<T, SqlMiddlewareDbError>,

Map the first row, if one was returned.

Errors

Returns any error produced by the mapper.

pub fn map_one<T, F>(self, mapper: F) -> Result<T, SqlMiddlewareDbError>

where F: FnOnce(&CustomDbRow) -> Result<T, SqlMiddlewareDbError>,

Map the first row or return an error when the result set is empty.

Errors

Returns SqlMiddlewareDbError::ExecutionError if no row was returned, or any error produced by the mapper.

Trait Implementations

impl Clone for ResultSet

fn clone(&self) -> ResultSet

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ResultSet

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

Formats the value using the given formatter.

impl Default for ResultSet

fn default() -> ResultSet

Returns the “default value” for a type.