Struct ParameterMap 

pub struct ParameterMap {
    pub count: u32,
    pub names: Vec<(Vec<u8>, u32)>,
    pub numbered: u64,
}

Where a statement’s parameters ended up.

Fields

count: u32

The highest parameter index the statement used.

names: Vec<(Vec<u8>, u32)>

Named parameters and the index each was assigned.

numbered: u64

Which of ?1 to ?64 the statement wrote, as bit N - 1.

A bitset because the name of ?N is its own text, and copying that text into names cost two allocations on every compile of a statement that binds ?1. Compiling SELECT id FROM t WHERE email = ?1 is the statement the allocation budget measures. A number above 64 is rare and goes into names as before.

Implementations

impl ParameterMap

pub fn index_of(&self, name: &[u8]) -> Option<u32>

Returns the index a named parameter was assigned.

@param name - the parameter as written, sigil included

pub fn all_names(&self) -> Vec<(Vec<u8>, u32)>

Returns every parameter that has a name, ?N included, as the name and the index it was assigned.

Trait Implementations

impl Clone for ParameterMap

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParameterMap

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

Formats the value using the given formatter.

impl Default for ParameterMap

fn default() -> Self

Returns the “default value” for a type.

impl Eq for ParameterMap

impl PartialEq for ParameterMap

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ParameterMap