User_var_log_event Class Reference

#include <log_event.h>

Inheritance diagram for User_var_log_event:

Collaboration diagram for User_var_log_event:

Public Types
enum	{ UNDEF_F = 0, UNSIGNED_F = 1 }
Public Types inherited from Log_event
enum	enum_skip_reason { EVENT_SKIP_NOT, EVENT_SKIP_IGNORE, EVENT_SKIP_COUNT }
typedef unsigned char	Byte

Public Member Functions
void	print (FILE *file, PRINT_EVENT_INFO *print_event_info)
	User_var_log_event (const char *buf, uint event_len, const Format_description_log_event *description_event)
Log_event_type	get_type_code ()
bool	is_valid () const
Public Member Functions inherited from Log_event
	Log_event (enum_event_cache_type cache_type_arg=EVENT_INVALID_CACHE, enum_event_logging_type logging_type_arg=EVENT_INVALID_LOGGING)
void	print_timestamp (IO_CACHE *file, time_t *ts)
void	print_header (IO_CACHE *file, PRINT_EVENT_INFO *print_event_info, bool is_more)
void	print_base64 (IO_CACHE *file, PRINT_EVENT_INFO *print_event_info, bool is_more)
bool	wrapper_my_b_safe_write (IO_CACHE *file, const uchar *buf, ulong data_length)
void	set_artificial_event ()
void	set_relay_log_event ()
bool	is_artificial_event () const
bool	is_relay_log_event () const
bool	is_ignorable_event () const
bool	is_no_filter_event () const
bool	is_using_trans_cache () const
bool	is_using_stmt_cache () const
bool	is_using_immediate_logging () const
	Log_event (const char *buf, const Format_description_log_event *description_event)
void	register_temp_buf (char *buf)
void	free_temp_buf ()
virtual int	get_data_size ()
const char *	get_type_str ()

Public Attributes
const char *	name
uint	name_len
char *	val
ulong	val_len
Item_result	type
uint	charset_number
bool	is_null
uchar	flags
Public Attributes inherited from Log_event
my_off_t	log_pos
char *	temp_buf
struct timeval	when
ulong	exec_time
ulong	data_written
uint32	server_id
uint32	unmasked_server_id
uint16	flags
ulong	slave_exec_mode
enum_event_cache_type	event_cache_type
enum_event_logging_type	event_logging_type
ha_checksum	crc
ulong	mts_group_idx
Relay_log_info *	worker
ulonglong	future_event_relay_log_pos
uint8	checksum_alg

Additional Inherited Members
Static Public Member Functions inherited from Log_event
static Log_event *	read_log_event (IO_CACHE *file, const Format_description_log_event *description_event, my_bool crc_check)
static void *	operator new (size_t size)
static void	operator delete (void *ptr, size_t)
static void *	operator new (size_t, void *ptr)
static void	operator delete (void *, void *)
static Log_event *	read_log_event (const char *buf, uint event_len, const char **error, const Format_description_log_event *description_event, my_bool crc_check)
static const char *	get_type_str (Log_event_type type)
Protected Types inherited from Log_event
enum	enum_event_cache_type {   EVENT_INVALID_CACHE = 0, EVENT_STMT_CACHE, EVENT_TRANSACTIONAL_CACHE, EVENT_NO_CACHE,   EVENT_CACHE_COUNT }
enum	enum_event_logging_type { EVENT_INVALID_LOGGING = 0, EVENT_NORMAL_LOGGING, EVENT_IMMEDIATE_LOGGING, EVENT_CACHE_LOGGING_COUNT }

Detailed Description

Every time a query uses the value of a user variable, a User_var_log_event is written before the Query_log_event, to set the user variable.

Binary Format

Definition at line 2932 of file log_event.h.

Constructor & Destructor Documentation

User_var_log_event::User_var_log_event	(	const char *	buf,
		uint	event_len,
		const Format_description_log_event *	description_event
	)

We need to check if this is from an old server that did not pack information for flags. We do this by checking if there are extra bytes after the packed value. If there are we take the extra byte and it's value is assumed to contain the flags value.

Old events will not have this extra byte, thence, we keep the flags set to UNDEF_F.

Definition at line 7462 of file log_event.cc.

Here is the call graph for this function:

---

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

• sql/log_event.h
• sql/log_event.cc