MySQL 8.4.0
Source Code Documentation
Range_optimizer_error_handler Class Reference

Error handling class for range optimizer. More...

#include <internal.h>

Inheritance diagram for Range_optimizer_error_handler:

Public Member Functions

 Range_optimizer_error_handler ()
bool handle_condition (THD *thd, uint sql_errno, const char *, Sql_condition::enum_severity_level *level, const char *) override
 Handle a sql condition. More...
bool has_errors () const

Private Attributes

bool m_has_errors
bool m_is_mem_error

Additional Inherited Members

- Protected Member Functions inherited from Internal_error_handler
 Internal_error_handler ()
Internal_error_handlerprev_internal_handler () const
virtual ~Internal_error_handler ()=default

Detailed Description

Error handling class for range optimizer.

We handle only out of memory error here. This is to give a hint to the user to raise range_optimizer_max_mem_size if required. Warning for the memory error is pushed only once. The consequent errors will be ignored.

Constructor & Destructor Documentation

◆ Range_optimizer_error_handler()

Range_optimizer_error_handler::Range_optimizer_error_handler ( )

Member Function Documentation

◆ handle_condition()

bool Range_optimizer_error_handler::handle_condition ( THD thd,
uint  sql_errno,
const char *  sqlstate,
Sql_condition::enum_severity_level level,
const char *  msg 

Handle a sql condition.

This method can be implemented by a subclass to achieve any of the following:

  • mask a warning/error internally, prevent exposing it to the user,
  • mask a warning/error and throw another one instead. When this method returns true, the sql condition is considered 'handled', and will not be propagated to upper layers. It is the responsibility of the code installing an internal handler to then check for trapped conditions, and implement logic to recover from the anticipated conditions trapped during runtime.

This mechanism is similar to C++ try/throw/catch:

  • 'try' correspond to THD::push_internal_handler(),
  • 'throw' correspond to my_error(), which invokes my_message_sql(),
  • 'catch' correspond to checking how/if an internal handler was invoked, before removing it from the exception stack with THD::pop_internal_handler().
thdthe calling thread
sql_errnothe error number for the condition raised.
sqlstatethe SQLSTATE for the condition raised.
levelthe severity level for the condition raised.
msgthe error message for the condition raised.
true if the condition is handled

Implements Internal_error_handler.

◆ has_errors()

bool Range_optimizer_error_handler::has_errors ( ) const

Member Data Documentation

◆ m_has_errors

bool Range_optimizer_error_handler::m_has_errors

◆ m_is_mem_error

bool Range_optimizer_error_handler::m_is_mem_error

The documentation for this class was generated from the following file: