dd::sdi_utils::Closure_error_handler< CONDITION_HANDLER_CLOS > Class Template Reference

Class template which derives from Internal_error_handler and overrides handle_condition with the CONDITION_HANDLER_CLOS template parameter. More...

#include <sdi_utils.h>

Inheritance diagram for dd::sdi_utils::Closure_error_handler< CONDITION_HANDLER_CLOS >:

Public Member Functions
	Closure_error_handler (CONDITION_HANDLER_CLOS &&ch)

Private Member Functions
bool	handle_condition (THD *, uint sql_errno, const char *sqlstate, Sql_condition::enum_severity_level *level, const char *msg) override
	Handle a sql condition. More...

Private Attributes
CONDITION_HANDLER_CLOS	m_ch

Additional Inherited Members
Protected Member Functions inherited from Internal_error_handler
	Internal_error_handler ()
Internal_error_handler *	prev_internal_handler () const
virtual	~Internal_error_handler ()=default

Detailed Description

template<typename CONDITION_HANDLER_CLOS>
class dd::sdi_utils::Closure_error_handler< CONDITION_HANDLER_CLOS >

Class template which derives from Internal_error_handler and overrides handle_condition with the CONDITION_HANDLER_CLOS template parameter.

Constructor & Destructor Documentation

Closure_error_handler()

template<typename CONDITION_HANDLER_CLOS >

dd::sdi_utils::Closure_error_handler< CONDITION_HANDLER_CLOS >::Closure_error_handler ( CONDITION_HANDLER_CLOS &&  ch )

inlineexplicit

Member Function Documentation

handle_condition()

template<typename CONDITION_HANDLER_CLOS >

bool dd::sdi_utils::Closure_error_handler< CONDITION_HANDLER_CLOS >::handle_condition ( THD *  thd, uint  sql_errno, const char *  sqlstate, Sql_condition::enum_severity_level *  level, const char *  msg  )

inlineoverrideprivatevirtual

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().

Parameters

thd	the calling thread
sql_errno	the error number for the condition raised.
sqlstate	the SQLSTATE for the condition raised.
level	the severity level for the condition raised.
msg	the error message for the condition raised.

Returns

true if the condition is handled

Implements Internal_error_handler.

Member Data Documentation

m_ch

template<typename CONDITION_HANDLER_CLOS >

CONDITION_HANDLER_CLOS dd::sdi_utils::Closure_error_handler< CONDITION_HANDLER_CLOS >::m_ch

private

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

• sql/dd/impl/sdi_utils.h