MySQL Internals Manual  /  Important Algorithms and Structures  /  Error Flags and Functions

10.12 Error Flags and Functions

The following flags can be examined or set to alter the behavior during error handling:

  • thd->net.report_error

thd->net.report_error is set in my_message_sql() if the error message was registered. (my_message_sql() is called by my_error(), my_printf_error(), my_message()).

  • thd->query_error

Like net.report_error, but is always set to 1 in my_message_sql() if error was not caught by an error handler. Used by replication to see if a query generated any kind of errors.

  • thd->no_warnings_for_error

Normally an error also generates a warning. The warning can be disabled by setting thd->no_warnings_for_error. (This allows one to catch all error messages generated by a statement)

  • thd->lex->current_select->no_error

This is set to in case likes INSERT IGNORE ... SELECT. In this case we ignore all not fatal errors generated by the select.

  • thd->is_fatal_error

Set this if we should abort the current statement (and any multi-line statements) because something went fatally wrong. (for example, a stored procedure continue handler should not be able to catch this). This is reset by mysql_reset_thd_for_next_command().

  • thd->abort_on_warning

Strict mode flag, which means that we should abort the statement if we get a warning. In the field::store function this changes the warning level from WARN to ERROR. In other cases, this flag is mostly tested with thd->really_abort_on_warning() to ensure we don't abort in the middle of an update with not transactional tables.

  • thd->count_cuted_fields

If set, we generate warning for field conversations (normal case for INSERT/UPDATE/DELETE). This is mainly set to 0 when doing internal copying of data between fields and we don't want to generate any conversion errors at any level.

  • thd->killed

Set in case of error in connection protocol or in case of 'kill'. In this case we should abort the query and kill the connection.

Error functions

  • thd->really_abort_on_warning()

This function returns 1 if a warning should be converted to an error, like in strict mode when all tables are transactional. The conversion is handled in

  • thd->fatal_error()

Should be called if we want to abort the current statement and any multi-line statement.

  • thd->clear_error()

Resets thd->net.report_error and thd->query_error.

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