Enum BatchStrategy 

pub enum BatchStrategy {
    In,
    Join,
    Subquery,
}

批量抓取策略

Variants

In

使用 WHERE id IN (?, ?, ...) 子句批量加载

适用场景：关联数量较少、目标表无索引时的备选方案

Join

使用 LEFT JOIN 一次性加载所有关联

适用场景：关联数量较少、需要原子性读取

Subquery

使用 WHERE id IN (SELECT ... FROM ...) 子查询批量加载

适用场景：子查询可被数据库优化器优化时

Implementations

impl BatchStrategy

pub fn name(&self) -> &'static str

策略名称

pub fn render_in_clause(column: &str, placeholders: usize) -> String

生成 IN 子句的 SQL 片段

返回形如 "id IN (?, ?, ?)" 的字符串（占位符数量与 values 一致）。

Trait Implementations

impl Clone for BatchStrategy

fn clone(&self) -> BatchStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BatchStrategy

impl Debug for BatchStrategy

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

Formats the value using the given formatter.

impl Default for BatchStrategy

fn default() -> BatchStrategy

Returns the “default value” for a type.

impl Eq for BatchStrategy

impl Hash for BatchStrategy

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 BatchStrategy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BatchStrategy