Info_schema_error_handler Class Reference

Error handler class to convert ER_LOCK_DEADLOCK error to ER_WARN_I_S_SKIPPED_TABLE/TABLESPACE error. More...

#include <error_handler.h>

Inheritance diagram for Info_schema_error_handler:

Public Member Functions
	Info_schema_error_handler (THD *thd, const String *schema_name, const String *table_name)
	Following are implementation of error handler to convert ER_LOCK_DEADLOCK error when executing I_S.TABLES and I_S.FILES system view. More...
	Info_schema_error_handler (THD *thd, const String *tablespace_name)
bool	handle_condition (THD *, uint sql_errno, const char *, Sql_condition::enum_severity_level *, const char *) override
	Handle a sql condition. More...
bool	is_error_handled () const

Private Types
enum class	Mdl_object_type { TABLE , TABLESPACE }

Private Attributes
bool	m_can_deadlock
const String *	m_schema_name
const String *	m_table_name
const String *	m_tablespace_name
Mdl_object_type	m_object_type
bool	m_error_handled = false

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

Error handler class to convert ER_LOCK_DEADLOCK error to ER_WARN_I_S_SKIPPED_TABLE/TABLESPACE error.

Handler is pushed for opening a table or acquiring a MDL lock on tables for INFORMATION_SCHEMA views (system views) operations.

Member Enumeration Documentation

Mdl_object_type

enum class Info_schema_error_handler::Mdl_object_type

strongprivate

Enumerator
TABLE
TABLESPACE

Constructor & Destructor Documentation

Info_schema_error_handler() [1/2]

Info_schema_error_handler::Info_schema_error_handler	(	THD *	thd,
		const String *	schema_name,
		const String *	table_name
	)

Following are implementation of error handler to convert ER_LOCK_DEADLOCK error when executing I_S.TABLES and I_S.FILES system view.

Info_schema_error_handler() [2/2]

Info_schema_error_handler::Info_schema_error_handler	(	THD *	thd,
		const String *	tablespace_name
	)

Member Function Documentation

handle_condition()

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

overridevirtual

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.

is_error_handled()

bool Info_schema_error_handler::is_error_handled ( ) const

inline

Member Data Documentation

m_can_deadlock

bool Info_schema_error_handler::m_can_deadlock

private

m_error_handled

bool Info_schema_error_handler::m_error_handled = false

private

m_object_type

Mdl_object_type Info_schema_error_handler::m_object_type

private

m_schema_name

const String* Info_schema_error_handler::m_schema_name

private

m_table_name

const String* Info_schema_error_handler::m_table_name

private

m_tablespace_name

const String* Info_schema_error_handler::m_tablespace_name

private

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

• sql/error_handler.h
• sql/error_handler.cc