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SqlxPgConnection

Struct SqlxPgConnection 

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pub struct SqlxPgConnection { /* private fields */ }

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impl Connection for SqlxPgConnection

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fn execute_with_params<'a>( &'a mut self, sql: &'a str, params: &'a [Value], ) -> Pin<Box<dyn Future<Output = Result<u64, DbError>> + Send + 'a>>

PostgreSQL 参数绑定执行(INSERT/UPDATE/DELETE)

使用 sqlx prepared statement 绑定参数。PostgreSQL 协议使用 $1, $2, ... 占位符。

§类型映射说明

PostgreSQL 不支持无符号整数类型(u8/u16/u32/u64),因此无符号 Value 绑定 时按“最小可容纳的有符号类型“转换:

  • U8i16(PostgreSQL SMALLINT
  • U16i32(PostgreSQL INTEGER
  • U32i64(PostgreSQL BIGINT
  • U64i64(可能截断,仅适用于 < i64::MAX 的值)

其他类型直接 bind;未知类型回退为 to_string() 后以 TEXT 绑定。

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fn query_with_params<'a>( &'a mut self, sql: &'a str, params: &'a [Value], ) -> Pin<Box<dyn Future<Output = Result<QueryRows, DbError>> + Send + 'a>>

PostgreSQL 参数绑定查询(SELECT,HashMap 映射)

类型映射规则与 Self::execute_with_params 相同。

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fn query_values<'a>( &'a mut self, sql: &'a str, ) -> Pin<Box<dyn Future<Output = Result<QueryValues, DbError>> + Send + 'a>>

PostgreSQL 位置式查询(SELECT,无参数)

绕过 HashMap 行映射,返回 (列名, 按列序号的值矩阵)。适用于 SELECT ALL 大结果集。

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fn query_values_with_params<'a>( &'a mut self, sql: &'a str, params: &'a [Value], ) -> Pin<Box<dyn Future<Output = Result<QueryValues, DbError>> + Send + 'a>>

PostgreSQL 参数绑定位置式查询(SELECT)

类型映射规则与 Self::execute_with_params 相同。

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fn query_stream<'a>( &'a mut self, sql: &'a str, ) -> Pin<Box<dyn Stream<Item = Result<HashMap<String, Value>, DbError>> + Send + 'a>>

PostgreSQL 流式查询:逐行返回结果,避免大结果集 fetch_all 内存峰值

使用 sqlx::query::fetch 获取行流,逐行映射为 HashMap<String, Value>。 流正常消费完毕后连接归还 self.conn;若提前 drop 流,连接通过 PoolConnection::drop 归还到 sqlx 池,但 self.conn 变为 None

注意:PostgreSQL 的 fetch 返回 Pin<Box<dyn Stream<...>>>(boxed trait object), 其析构函数可能持有 pool_conn 的借用,导致无法直接 self.conn = Some(pool_conn)。 通过显式 drop(row_stream) 提前结束借用,再归还连接。

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fn execute<'a>( &'a mut self, sql: &'a str, ) -> Pin<Box<dyn Future<Output = Result<u64, DbError>> + Send + 'a>>

执行 SQL(INSERT/UPDATE/DELETE),返回影响行数
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fn query<'a>( &'a mut self, sql: &'a str, ) -> Pin<Box<dyn Future<Output = Result<Vec<HashMap<String, Value>>, DbError>> + Send + 'a>>

执行查询(SELECT),返回结果行集
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fn begin_transaction<'a>( &'a mut self, ) -> Pin<Box<dyn Future<Output = Result<(), DbError>> + Send + 'a>>

开启事务
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fn commit<'a>( &'a mut self, ) -> Pin<Box<dyn Future<Output = Result<(), DbError>> + Send + 'a>>

提交事务
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fn rollback<'a>( &'a mut self, ) -> Pin<Box<dyn Future<Output = Result<(), DbError>> + Send + 'a>>

回滚事务
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fn is_connected(&self) -> bool

判断连接是否仍然有效
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fn ping<'a>(&'a mut self) -> Pin<Box<dyn Future<Output = bool> + Send + 'a>>

发送 PING 检测连接存活
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fn close<'a>( &'a mut self, ) -> Pin<Box<dyn Future<Output = Result<(), DbError>> + Send + 'a>>

关闭连接
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fn query_stream_cursor<'a>( &'a mut self, sql: &'a str, _batch_size: usize, ) -> Pin<Box<dyn Stream<Item = Result<HashMap<String, Value>, DbError>> + Send + 'a>>

游标式流式查询(P1-2):按 batch_size 分批拉取,避免大结果集内存峰值。 Read more
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fn execute_batch<'a>( &'a mut self, sqls: &'a [String], ) -> Pin<Box<dyn Future<Output = Result<u64, DbError>> + Send + 'a>>

批量执行多条 SQL(按顺序执行,返回累计影响行数) Read more
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fn execute_batch_params<'a>( &'a mut self, sql: &'a str, params_batch: &'a [Vec<Value>], ) -> Pin<Box<dyn Future<Output = Result<u64, DbError>> + Send + 'a>>

批量插入(单条 SQL 多次参数绑定执行) Read more
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impl Drop for SqlxPgConnection

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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 PgExtensions for SqlxPgConnection

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fn listen<'life0, 'life1, 'async_trait>( &'life0 mut self, channel: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<(), DbError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

LISTEN 通道:订阅指定通道的通知 Read more
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fn notify<'life0, 'life1, 'life2, 'async_trait>( &'life0 mut self, channel: &'life1 str, payload: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<(), DbError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

NOTIFY 通道:向指定通道发送通知 Read more
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fn copy_from_stdin<'life0, 'life1, 'life2, 'async_trait>( &'life0 mut self, sql: &'life1 str, data: &'life2 [u8], ) -> Pin<Box<dyn Future<Output = Result<u64, DbError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

COPY FROM STDIN:批量导入数据 Read more

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