Abstract superclass for handling logging to slow/general logs. More...

#include <log.h>

Inheritance diagram for Log_event_handler:

Public Member Functions
	Log_event_handler ()=default

virtual	~Log_event_handler ()=default

virtual bool	log_slow (THD thd, ulonglong current_utime, ulonglong query_start_arg, const char user_host, size_t user_host_len, ulonglong query_utime, ulonglong lock_utime, bool is_command, const char *sql_text, size_t sql_text_len)=0
	Log a query to the slow log. More...

virtual bool	log_general (THD thd, ulonglong event_utime, const char user_host, size_t user_host_len, my_thread_id thread_id, const char command_type, size_t command_type_len, const char sql_text, size_t sql_text_len, const CHARSET_INFO *client_cs)=0
	Log command to the general log. More...

Detailed Description

Abstract superclass for handling logging to slow/general logs.

Currently has two subclasses, for table and file based logging.

Constructor & Destructor Documentation

Log_event_handler::Log_event_handler ( )

default

virtual Log_event_handler::~Log_event_handler ( )

virtualdefault

virtual bool Log_event_handler::log_general	(	THD *	thd,
		ulonglong	event_utime,
		const char *	user_host,
		size_t	user_host_len,
		my_thread_id	thread_id,
		const char *	command_type,
		size_t	command_type_len,
		const char *	sql_text,
		size_t	sql_text_len,
		const CHARSET_INFO *	client_cs
	)

pure virtual

Log command to the general log.

Parameters

thd	THD of the query
event_utime	Command start timestamp in micro seconds
user_host	The pointer to the string with user@host info
user_host_len	Length of the user_host string. this is computed once and passed to all general log event handlers
thread_id	Id of the thread, issued a query
command_type	The type of the command being logged
command_type_len	The length of the string above
sql_text	The very text of the query being executed
sql_text_len	The length of sql_text string
client_cs	Character set to use for strings

Returns: This function attempts to never call my_error(). This is necessary, because general logging happens already after a statement status has been sent to the client, so the client can not see the error anyway. Besides, the error is not related to the statement being executed and is internal, and thus should be handled internally (

Return values

false	OK
true	error occurred

virtual bool Log_event_handler::log_slow	(	THD *	thd,
		ulonglong	current_utime,
		ulonglong	query_start_arg,
		const char *	user_host,
		size_t	user_host_len,
		ulonglong	query_utime,
		ulonglong	lock_utime,
		bool	is_command,
		const char *	sql_text,
		size_t	sql_text_len
	)

pure virtual

Log a query to the slow log.

Parameters

thd	THD of the query
current_utime	Current timestamp in microseconds
query_start_arg	Command start timestamp in microseconds
user_host	The pointer to the string with user@host info
user_host_len	Length of the user_host string
query_utime	Number of microseconds query execution took
lock_utime	Number of microseconds the query was locked
is_command	The flag which determines whether the sql_text is a query or an administrator command
sql_text	The query or administrator in textual form
sql_text_len	The length of sql_text string

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