MySQL 8 Administrator???s Guide

Creating the handlerton

The handlerton (the short form of handler singleton) defines the storage engine. It contains method pointers to methods applied to the storage engine as a whole, instead of methods that work on a per-table basis. Examples of such methods include transaction methods which handle commits and rollbacks operations.

An example from the EXAMPLE storage engine is as follows:

handlerton example_hton= {  "EXAMPLE", /* Name of the storage engine */  SHOW_OPTION_YES, /* It should be displayed in options or not */  "Example storage engine", /* Description of the storage engine */  DB_TYPE_EXAMPLE_DB, /* Type of storage engine it should refer to */  NULL, /* Initialize handlerton */  0, /* slot  available */ 0, /* define savepoint size. ...