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QueryCache

Struct QueryCache 

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pub struct QueryCache { /* private fields */ }
Expand description

查询缓存

缓存查询结果,配合 TimestampCache 实现自动失效。

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impl QueryCache

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pub fn new(max_entries: usize) -> Self

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pub fn get(&self, key: &QueryCacheKey) -> Option<Vec<HashMap<String, Value>>>

尝试从缓存获取查询结果

如果缓存命中且未过期,返回 Some(results)。 否则返回 None

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pub fn put( &self, key: QueryCacheKey, rows: Vec<HashMap<String, Value>>, depends_on: Vec<String>, )

缓存查询结果

depends_on 指定此查询依赖的表列表。 当这些表被修改时,缓存条目自动失效。

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pub fn invalidate_table(&self, table: &str)

通知表被修改(使依赖该表的缓存条目失效)

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pub fn invalidate_tables(&self, tables: &[&str])

批量失效

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pub fn clear(&self)

清除所有缓存

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pub fn len(&self) -> usize

当前缓存条目数

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pub fn is_empty(&self) -> bool

是否为空

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pub fn timestamps(&self) -> &TimestampCache

获取时间戳缓存引用

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impl Default for QueryCache

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fn default() -> Self

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

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