MySQL 8.4.3
Source Code Documentation
Silence_log_table_errors Class Reference

Silence all errors and warnings reported when performing a write to a log table. More...

Inheritance diagram for Silence_log_table_errors:
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Public Member Functions

 Silence_log_table_errors ()
 
bool handle_condition (THD *, uint, const char *, Sql_condition::enum_severity_level *, const char *msg) override
 Handle a sql condition. More...
 
const char * message () const
 

Private Attributes

char m_message [MYSQL_ERRMSG_SIZE]
 

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

Silence all errors and warnings reported when performing a write to a log table.

Errors and warnings are not reported to the client or SQL exception handlers, so that the presence of logging does not interfere and affect the logic of an application.

Constructor & Destructor Documentation

◆ Silence_log_table_errors()

Silence_log_table_errors::Silence_log_table_errors ( )
inline

Member Function Documentation

◆ handle_condition()

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

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
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.
Returns
true if the condition is handled

Implements Internal_error_handler.

◆ message()

const char * Silence_log_table_errors::message ( ) const
inline

Member Data Documentation

◆ m_message

char Silence_log_table_errors::m_message[MYSQL_ERRMSG_SIZE]
private

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