MySQL 8.1.0
Source Code Documentation
dd::Check_constraint_name_error_handler Class Reference

Error handler to convert ER_DUP_ENTRY error to more user friendly error ER_CHECK_CONSTRAINT_DUP_NAME. More...

Inheritance diagram for dd::Check_constraint_name_error_handler:

Public Member Functions

 Check_constraint_name_error_handler (const char *name)
bool handle_condition (THD *, uint sql_errno, const char *, Sql_condition::enum_severity_level *, const char *) override
 Handle a sql condition. More...

Private Attributes

const char * m_name

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 handler to convert ER_DUP_ENTRY error to more user friendly error ER_CHECK_CONSTRAINT_DUP_NAME.

Constructor & Destructor Documentation

◆ Check_constraint_name_error_handler()

dd::Check_constraint_name_error_handler::Check_constraint_name_error_handler ( const char *  name)

Member Function Documentation

◆ handle_condition()

bool dd::Check_constraint_name_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.

Member Data Documentation

◆ m_name

const char* dd::Check_constraint_name_error_handler::m_name

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