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Transaction

Struct Transaction 

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pub struct Transaction { /* private fields */ }

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impl Transaction

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pub fn new() -> Self

创建一个无 backing 连接的空事务。

只能作为占位符用于「不执行任何语句」的场景;在其中执行 SQL 会返回错误。 需要真正执行语句时用 Transaction::with_inner 或后端的 transaction()。

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pub fn with_inner(inner: Box<dyn TransactionInner>) -> Self

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pub async fn commit(self) -> Result<(), RdbmsError>

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pub async fn rollback(self) -> Result<(), RdbmsError>

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impl Default for Transaction

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fn default() -> Self

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

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fn drop(&mut self)

Executes the destructor for this type. Read more
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fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)
Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned. Read more
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impl SqlExecutor for Transaction

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fn execute_then_query<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, first: &'life1 str, first_params: &'life2 [Value], second: &'life3 str, ) -> Pin<Box<dyn Future<Output = Result<Vec<Row>, RdbmsError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait,

在调用方已有的事务里跑两条语句:不另开事务,也不提交 —— 原子边界归调用方,insert(&tx, …) 的语义就是「用我这个事务发这两条」。

全程持锁:若在两条语句之间放开,并发的 tx.execute(…)(同一条连接上的 另一个 INSERT)会把 LAST_INSERT_ID() 的值换成它插的那条 —— 正是本方法要挡的静默错值。

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fn execute<'life0, 'life1, 'async_trait>( &'life0 self, sql: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<u64, RdbmsError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

执行一条 SQL 语句,返回受影响行数。 用户提供的值请走 SqlExecutor::execute_with。
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fn query<'life0, 'life1, 'async_trait>( &'life0 self, sql: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Vec<Row>, RdbmsError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

查询多行。用户提供的值请走 SqlExecutor::query_with。
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fn execute_with<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, sql: &'life1 str, params: &'life2 [Value], ) -> Pin<Box<dyn Future<Output = Result<u64, RdbmsError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

参数化执行,防注入。无法绑定参数的后端返回错误。
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fn query_with<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, sql: &'life1 str, params: &'life2 [Value], ) -> Pin<Box<dyn Future<Output = Result<Vec<Row>, RdbmsError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

参数化查询,防注入。无法绑定参数的后端返回错误。
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fn dialect(&self) -> Dialect

本执行器背后的数据库方言。
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fn query_write<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, sql: &'life1 str, params: &'life2 [Value], ) -> Pin<Box<dyn Future<Output = Result<Vec<Row>, RdbmsError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

写路径且需要返回结果(INSERT ... RETURNING / OUTPUT INSERTED)。 默认委托给 SqlExecutor::query_with;只有读写分离路由需要覆写, 否则写语句会被路由到从库。

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