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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

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

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.

Member Data Documentation

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.

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