Method get_last_sqlstate

sql/sql_prepare.h:278–278

  const char *get_last_error() const { return m_diagnostics_area.message(); }
  unsigned int get_last_errno() const { return m_diagnostics_area.sql_errno(); }
  const char *get_last_sqlstate() const { return m_diagnostics_area.get_sqlstate(); }

  /**
    Provided get_field_count() is not 0, this never fails. You don't