User_var_log_event Class Reference

#include <log_event.h>

Inheritance diagram for User_var_log_event:

List of all members.

Public Types
enum	{ UNDEF_F = 0, UNSIGNED_F = 1 }
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 Attributes
const char *	name
uint	name_len
char *	val
ulong	val_len
Item_result	type
uint	charset_number
bool	is_null
uchar	flags

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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

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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.

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Member Data Documentation

uchar User_var_log_event::flags

Some 16 flags. See the definitions above for LOG_EVENT_TIME_F, LOG_EVENT_FORCED_ROTATE_F, LOG_EVENT_THREAD_SPECIFIC_F, and LOG_EVENT_SUPPRESS_USE_F for notes.

Reimplemented from Log_event.

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

• log_event.h
• log_event.cc