MySQL 8.0.31
Source Code Documentation
No_such_table_error_handler Class Reference

This internal handler is used to trap ER_NO_SUCH_TABLE and ER_BAD_DB_ERROR. More...

#include <error_handler.h>

Inheritance diagram for No_such_table_error_handler:
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Public Member Functions

 No_such_table_error_handler ()
 
bool handle_condition (THD *, uint sql_errno, const char *, Sql_condition::enum_severity_level *, const char *) override
 Handle a sql condition. More...
 
bool safely_trapped_errors () const
 Returns true if one or more ER_NO_SUCH_TABLE and ER_BAD_DB_ERROR errors have been trapped and no other errors have been seen. More...
 

Private Attributes

int m_handled_errors
 
int m_unhandled_errors
 

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

This internal handler is used to trap ER_NO_SUCH_TABLE and ER_BAD_DB_ERROR.

Constructor & Destructor Documentation

◆ No_such_table_error_handler()

No_such_table_error_handler::No_such_table_error_handler ( )
inline

Member Function Documentation

◆ handle_condition()

bool No_such_table_error_handler::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.

◆ safely_trapped_errors()

bool No_such_table_error_handler::safely_trapped_errors ( ) const
inline

Returns true if one or more ER_NO_SUCH_TABLE and ER_BAD_DB_ERROR errors have been trapped and no other errors have been seen.

false otherwise.

Member Data Documentation

◆ m_handled_errors

int No_such_table_error_handler::m_handled_errors
private

◆ m_unhandled_errors

int No_such_table_error_handler::m_unhandled_errors
private

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