Struct mysql_async::PoolConstraints

pub struct PoolConstraints { /* private fields */ }

Connection pool constraints.

This type stores min and max constraints for crate::Pool and ensures that min <= max.

Implementations

impl PoolConstraints

pub fn new(min: usize, max: usize) -> Option<PoolConstraints>

Creates new PoolConstraints if constraints are valid (min <= max).

Connection URL

You can use pool_min and pool_max URL parameters to define pool constraints.

let opts = Opts::from_url("mysql://localhost/db?pool_min=0&pool_max=151")?;
assert_eq!(opts.pool_opts().constraints(), PoolConstraints::new(0, 151).unwrap());

pub fn min(&self) -> usize

Lower bound of this pool constraints.

pub fn max(&self) -> usize

Upper bound of this pool constraints.

Trait Implementations

impl Clone for PoolConstraints

fn clone(&self) -> PoolConstraints

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PoolConstraints

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

Formats the value using the given formatter.

impl Default for PoolConstraints

fn default() -> Self

Returns the “default value” for a type.

impl From<PoolConstraints> for (usize, usize)

fn from(_: PoolConstraints) -> Self

Transforms constraints to a pair of (min, max).

impl Hash for PoolConstraints

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for PoolConstraints

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for PoolConstraints

impl Eq for PoolConstraints

impl StructuralEq for PoolConstraints

impl StructuralPartialEq for PoolConstraints