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

A coordinator client that is bound to a connection.

See also Client.

Implementations§

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impl SessionClient

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pub fn parse<'a>( &self, sql: &'a str ) -> Result<Result<Vec<StatementParseResult<'a>>, ParserStatementError>, String>

Parses a SQL expression, reporting failures as a telemetry event if possible.

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pub async fn get_prepared_statement( &mut self, name: &str ) -> Result<&PreparedStatement, AdapterError>

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pub async fn prepare( &mut self, name: String, stmt: Option<Statement<Raw>>, sql: String, param_types: Vec<Option<ScalarType>> ) -> Result<(), AdapterError>

Saves the parsed statement as a prepared statement.

The prepared statement is saved in the connection’s crate::session::Session under the specified name.

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pub async fn declare( &mut self, name: String, stmt: Statement<Raw>, sql: String ) -> Result<(), AdapterError>

Binds a statement to a portal.

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pub async fn execute( &mut self, portal_name: String, cancel_future: impl Future<Output = Error> + Send, outer_ctx_extra: Option<ExecuteContextExtra> ) -> Result<(ExecuteResponse, Instant), AdapterError>

Executes a previously-bound portal.

Note: the provided cancel_future must be cancel-safe as it’s polled in a select! loop.

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pub fn start_transaction( &mut self, implicit: Option<usize> ) -> Result<(), AdapterError>

Starts a transaction based on implicit:

  • None: InTransaction
  • Some(1): Started
  • Some(n > 1): InTransactionImplicit
  • Some(0): no change
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pub async fn end_transaction( &mut self, action: EndTransactionAction ) -> Result<ExecuteResponse, AdapterError>

Ends a transaction.

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pub fn fail_transaction(&mut self)

Fails a transaction.

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pub async fn catalog_snapshot(&self) -> Arc<Catalog>

Fetches the catalog.

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pub async fn dump_catalog(&mut self) -> Result<CatalogDump, AdapterError>

Dumps the catalog to a JSON string.

No authorization is performed, so access to this function must be limited to internal servers or superusers.

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pub async fn check_catalog(&mut self) -> Result<(), Value>

Checks the catalog for internal consistency, returning a JSON object describing the inconsistencies, if there are any.

No authorization is performed, so access to this function must be limited to internal servers or superusers.

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pub async fn check_coordinator(&mut self) -> Result<(), Value>

Checks the coordinator for internal consistency, returning a JSON object describing the inconsistencies, if there are any. This is a superset of checks that check_catalog performs,

No authorization is performed, so access to this function must be limited to internal servers or superusers.

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pub async fn dump_coordinator_state(&mut self) -> Result<Value, Error>

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pub fn retire_execute( &mut self, data: ExecuteContextExtra, reason: StatementEndedExecutionReason )

Tells the coordinator a statement has finished execution, in the cases where we have no other reason to communicate with the coordinator.

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pub async fn insert_rows( &mut self, id: GlobalId, columns: Vec<usize>, rows: Vec<Row>, ctx_extra: ExecuteContextExtra ) -> Result<ExecuteResponse, AdapterError>

Inserts a set of rows into the given table.

The rows only contain the columns positions in columns, so they must be re-encoded for adding the default values for the remaining ones.

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pub async fn get_system_vars( &mut self ) -> Result<GetVariablesResponse, AdapterError>

Gets the current value of all system variables.

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pub async fn set_system_vars( &mut self, vars: BTreeMap<String, String> ) -> Result<(), AdapterError>

Updates the specified system variables to the specified values.

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pub async fn terminate(&mut self)

Terminates the client session.

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pub fn session(&mut self) -> &mut Session

Returns a mutable reference to the session bound to this client.

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pub fn inner(&self) -> &Client

Returns a reference to the inner client.

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pub fn add_idle_in_transaction_session_timeout(&mut self)

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pub fn remove_idle_in_transaction_session_timeout(&mut self)

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pub async fn recv_timeout(&mut self) -> Option<TimeoutType>

§Cancel safety

This method is cancel safe. If recv is used as the event in a tokio::select! statement and some other branch completes first, it is guaranteed that no messages were received on this channel.

Trait Implementations§

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impl Drop for SessionClient

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fn drop(&mut self)

Executes the destructor for this type. Read more

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