Module hton 

Engine-level handlerton interface.

Where StorageEngine is per-table, the handlerton is a per-engine singleton: one instance serves every connection. An engine opts into engine-level behaviour by implementing Handlerton and registering it with register_handlerton. Engines that need nothing beyond table handling skip registration and keep the zero-config defaults.

Structs

HtonCapabilities

The set of engine-level features a Handlerton opts into.

HtonFlags

A set of handlerton flags (the HTON_* bits from sql/handler.h).

SecondaryEngineOptimizerRequest

The pair the secondary engine returns from Handlerton::secondary_engine_check_optimizer_request.

StatPrintSink

A handle that lets a Handlerton::show_status implementation push one or more rows of engine status back to MySQL. Bound to the connection and stat_print_fn MySQL handed in, so it does not outlive the callback.

Enums

BinlogCommand

The DDL command flavour MySQL is logging through the binary log.

BinlogFunc

The binlog-related function MySQL is asking the engine to perform.

DictInitMode

How a data-dictionary backend should initialise its on-disk files.

DictRecoveryMode

Mode for data-dictionary recovery during startup.

HaCloneMode

Mode for starting a clone operation.

HaCloneType

Clone-transfer type the source engine should perform.

HaNotificationType

Whether the notification fires before (pre) or after (post) the event.

HaPanicFunction

The reason MySQL is invoking the engine-level panic callback.

HaStatType

Which subset of engine status MySQL wants for SHOW ENGINE <name> STATUS.

SecondaryEngineGraphSimplificationRequest

What the secondary engine asks the hypergraph optimizer to do next.

SelectExecutedIn

Which engine MySQL executed a SELECT on, exposed to the post-select notification.

TablespaceType

The classification of a data-dictionary tablespace.

TsCommandType

The tablespace DDL command MySQL is asking the engine to validate.

Traits

Handlerton

The engine-level handlerton interface: the capabilities and handlerton struct fields that apply to the engine as a whole rather than to a single table.

TxnSession

The transaction state for one connection.