Struct mysql::PoolOpts

impl PoolOpts

pub fn new() -> Self

Calls Self::default.

pub fn with_constraints(self, constraints: PoolConstraints) -> Self

Creates the default PoolOpts with the given constraints.

pub fn constraints(&self) -> PoolConstraints

Returns pool constraints.

pub fn with_reset_connection(self, reset_connection: bool) -> Self

Sets whether to reset the connection upon returning it to a pool (defaults to true).

Default behavior increases reliability but comes with cons:

reset procedure removes all prepared statements, i.e. kills prepared statements cache
connection reset is quite fast but requires additional client-server roundtrip (might require re-authentication for older servers)

The purpose of the reset procedure is to:

rollback any opened transactions
reset transaction isolation level
reset session variables
delete user variables
remove temporary tables
remove all PREPARE statement (this action kills prepared statements cache)

So to increase overall performance you can safely opt-out of the default behavior if you are not willing to change the session state in an unpleasant way.

It is also possible to selectively opt-in/out using crate::PooledConn::reset_connection.

§Connection URL

You can use reset_connection URL parameter to set this value. E.g.

let opts = Opts::from_url("mysql://localhost/db?reset_connection=false")?;
assert_eq!(opts.get_pool_opts().reset_connection(), false);

pub fn reset_connection(&self) -> bool

Returns the reset_connection value (see PoolOpts::with_reset_connection).

pub fn with_check_health(self, check_health: bool) -> Self

Sets whether to check connection health upon retrieving it from a pool (defaults to true).

If true, then Conn::ping will be invoked on a non-fresh pooled connection.

§Connection URL

Use check_health URL parameter to set this value. E.g.

let opts = Opts::from_url("mysql://localhost/db?check_health=false")?;
assert_eq!(opts.get_pool_opts().check_health(), false);

pub fn check_health(&self) -> bool

Trait Implementations§

impl Clone for PoolOpts

fn clone(&self) -> PoolOpts

Returns a copy of the value. Read more

1.0.0 · source§

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

Performs copy-assignment from source. Read more

impl Debug for PoolOpts

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

Formats the value using the given formatter. Read more

impl Default for PoolOpts

fn default() -> Self

Returns the “default value” for a type. Read more

impl Hash for PoolOpts

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

Feeds this value into the given Hasher. Read more

1.3.0 · source§

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

Feeds a slice of this type into the given Hasher. Read more

impl PartialEq for PoolOpts

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

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

1.0.0 · source§

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 Eq for PoolOpts

impl StructuralPartialEq for PoolOpts

Auto Trait Implementations§

impl UnwindSafe for PoolOpts

Blanket Implementations§

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where T: 'static + ?Sized,

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Causes self to use its LowerHex implementation when Debug-formatted.

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Causes self to use its Octal implementation when Debug-formatted.

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Causes self to use its UpperExp implementation when Debug-formatted.

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const ALIGN: usize = _

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