st_io_cache结构参考

#include <my_sys.h>

所有成员的列表。

公有属性
my_off_t	pos_in_file
my_off_t	end_of_file
uchar *	read_pos
uchar *	read_end
uchar *	buffer
uchar *	request_pos
uchar *	write_buffer
uchar *	append_read_pos
uchar *	write_pos
uchar *	write_end
uchar **	current_pos
uchar **	current_end
int(*	read_function )(struct st_io_cache *, uchar *, size_t)
int(*	write_function )(struct st_io_cache *, const uchar *, size_t)
enum cache_type	type
IO_CACHE_CALLBACK	pre_read
IO_CACHE_CALLBACK	post_read
IO_CACHE_CALLBACK	pre_close
IO_CACHE_CALLBACK	post_write
ulong	disk_writes
void *	arg
char *	file_name
char *	dir
char *	prefix
File	file
int	seek_not_done
int	error
int	hard_write_error_in_the_past
size_t	buffer_length
size_t	read_length
myf	myflags
my_bool	alloced_buffer

---

成员数据文档

my_bool st_io_cache::alloced_buffer

uchar* st_io_cache::append_read_pos

void* st_io_cache::arg

used by pre/post_read,post_write

uchar* st_io_cache::buffer

size_t st_io_cache::buffer_length

uchar ** st_io_cache::current_end

uchar** st_io_cache::current_pos

char* st_io_cache::dir

ulong st_io_cache::disk_writes

my_off_t st_io_cache::end_of_file

int st_io_cache::error

File st_io_cache::file

char* st_io_cache::file_name

int st_io_cache::hard_write_error_in_the_past

Cumulative 'error' since last [re]init_io_cache(). Useful if cache's user polls for errors only once in a while.

myf st_io_cache::myflags

my_off_t st_io_cache::pos_in_file

IO_CACHE_CALLBACK st_io_cache::post_read

called after reading from disk

IO_CACHE_CALLBACK st_io_cache::post_write

Called _after_ writing to disk; not honoured by SEQ_READ_APPEND

IO_CACHE_CALLBACK st_io_cache::pre_close

called before ending the cache

IO_CACHE_CALLBACK st_io_cache::pre_read

called before reading from disk

char * st_io_cache::prefix

uchar* st_io_cache::read_end

int(* st_io_cache::read_function)(struct st_io_cache *, uchar *, size_t)

size_t st_io_cache::read_length

uchar* st_io_cache::read_pos

uchar* st_io_cache::request_pos

int st_io_cache::seek_not_done

enum cache_type st_io_cache::type

uchar* st_io_cache::write_buffer

uchar* st_io_cache::write_end

int(* st_io_cache::write_function)(struct st_io_cache *, const uchar *, size_t)

uchar* st_io_cache::write_pos

---

该结构的文档由以下文件生成：

• K:/CMGDKv18/SDK/Source/SQL/MySQL/include/my_sys.h