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DuckDbConnection

Struct DuckDbConnection 

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

DuckDB 连接包装器

v0.3.0 性能优化:使用连接池(Vec<duckdb::Connection>)替代单 Mutex<Connection>

通过 Connection::try_clone() 创建多个连接共享同一个 DatabaseHandle, 每个 spawn_blocking 任务从池中获取一个连接,执行后归还。 Semaphore 限制并发数 = 连接池大小,实现真正的并行查询。

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impl DuckDbConnection

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pub fn new(url: &str) -> Result<Self, DbError>

创建新的 DuckDB 连接(默认连接池大小 4)

§参数
  • url - DuckDB 连接字符串,支持:
    • :memory:duckdb::memory: — 内存数据库
    • duckdb:path/to/file.db — 文件数据库
    • duckdb://path/to/file.db — 文件数据库(URL 格式)
§错误

连接创建失败时返回 DbError::Connection

§示例
use dbnexus::database::pool::DuckDbConnection;

let conn = DuckDbConnection::new("duckdb::memory:")?;
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pub fn with_pool_size(url: &str, pool_size: usize) -> Result<Self, DbError>

创建指定连接池大小的 DuckDB 连接

§参数
  • url - DuckDB 连接字符串
  • pool_size - 连接池大小(并发查询数)
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pub async fn execute(&self, sql: &str) -> DbResult<DuckDbExecResult>

执行 SQL(DDL/DML),返回受影响行数

v0.3.0 连接池模式:从池中取出连接 → spawn_blocking 执行 → 归还连接

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pub async fn query(&self, sql: &str) -> DbResult<Vec<DuckDbRow>>

执行查询,返回结果行集合

v0.3.0 连接池模式:从池中取出连接 → spawn_blocking 执行 → 归还连接

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pub async fn health_check(&self) -> DbResult<()>

健康检查(执行 SELECT 1

§错误

连接不可用时返回 DbError::Connection

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pub fn pool_size(&self) -> usize

获取连接池大小

Trait Implementations§

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impl Clone for DuckDbConnection

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fn clone(&self) -> DuckDbConnection

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for DuckDbConnection

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

Formats the value using the given formatter. Read more

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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