Enum ConnectionPurpose 

pub enum ConnectionPurpose {
    Mapper,
    Migration,
    Probe,
    Direct,
}

调用方显式声明的连接用途，不从任务、SQL 或错误文本推断。

Variants

Mapper

Mapper 业务 SQL 使用的连接。

Migration

数据库迁移使用的连接。

Probe

连接或服务健康探测使用的连接。

Direct

业务直接访问连接池。

Implementations

impl ConnectionPurpose

pub const fn as_str(self) -> &'static str

业务作用：返回连接用途对应的固定指标值。

参数说明：无。

返回：不会包含业务输入的静态标识。

Trait Implementations

impl Clone for ConnectionPurpose

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ConnectionPurpose

impl Debug for ConnectionPurpose

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

Formats the value using the given formatter.

impl Eq for ConnectionPurpose

impl PartialEq for ConnectionPurpose

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ConnectionPurpose