ha_archive.h
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:5k
- /* Copyright (C) 2003 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- #ifdef USE_PRAGMA_INTERFACE
- #pragma interface /* gcc class implementation */
- #endif
- #include <zlib.h>
- /*
- Please read ha_archive.cc first. If you are looking for more general
- answers on how storage engines work, look at ha_example.cc and
- ha_example.h.
- */
- typedef struct st_archive_share {
- char *table_name;
- char data_file_name[FN_REFLEN];
- uint table_name_length,use_count;
- pthread_mutex_t mutex;
- THR_LOCK lock;
- File meta_file; /* Meta file we use */
- gzFile archive_write; /* Archive file we are working with */
- bool dirty; /* Flag for if a flush should occur */
- ulonglong rows_recorded; /* Number of rows in tables */
- } ARCHIVE_SHARE;
- /*
- Version for file format.
- 1 - Initial Version
- */
- #define ARCHIVE_VERSION 1
- class ha_archive: public handler
- {
- THR_LOCK_DATA lock; /* MySQL lock */
- ARCHIVE_SHARE *share; /* Shared lock info */
- gzFile archive; /* Archive file we are working with */
- z_off_t current_position; /* The position of the row we just read */
- byte byte_buffer[IO_SIZE]; /* Initial buffer for our string */
- String buffer; /* Buffer used for blob storage */
- ulonglong scan_rows; /* Number of rows left in scan */
- public:
- ha_archive(TABLE *table): handler(table)
- {
- /* Set our original buffer from pre-allocated memory */
- buffer.set((char*)byte_buffer, IO_SIZE, system_charset_info);
- /* The size of the offset value we will use for position() */
- ref_length = sizeof(z_off_t);
- }
- ~ha_archive()
- {
- }
- const char *table_type() const { return "ARCHIVE"; }
- const char *index_type(uint inx) { return "NONE"; }
- const char **bas_ext() const;
- ulong table_flags() const
- {
- return (HA_REC_NOT_IN_SEQ | HA_NOT_EXACT_COUNT | HA_NO_AUTO_INCREMENT |
- HA_FILE_BASED);
- }
- ulong index_flags(uint idx, uint part, bool all_parts) const
- {
- return 0;
- }
- /*
- Have to put something here, there is no real limit as far as
- archive is concerned.
- */
- uint max_supported_record_length() const { return UINT_MAX; }
- /*
- Called in test_quick_select to determine if indexes should be used.
- */
- virtual double scan_time() { return (double) (records) / 20.0+10; }
- /* The next method will never be called */
- virtual double read_time(uint index, uint ranges, ha_rows rows)
- { return (double) rows / 20.0+1; }
- int open(const char *name, int mode, uint test_if_locked);
- int close(void);
- int write_row(byte * buf);
- int update_row(const byte * old_data, byte * new_data);
- int delete_row(const byte * buf);
- int delete_all_rows();
- int index_read(byte * buf, const byte * key,
- uint key_len, enum ha_rkey_function find_flag);
- int index_read_idx(byte * buf, uint idx, const byte * key,
- uint key_len, enum ha_rkey_function find_flag);
- int index_next(byte * buf);
- int index_prev(byte * buf);
- int index_first(byte * buf);
- int index_last(byte * buf);
- int rnd_init(bool scan=1);
- int rnd_next(byte *buf);
- int rnd_pos(byte * buf, byte *pos);
- int get_row(gzFile file_to_read, byte *buf);
- int read_meta_file(File meta_file, ulonglong *rows);
- int write_meta_file(File meta_file, ulonglong rows, bool dirty);
- ARCHIVE_SHARE *get_share(const char *table_name, TABLE *table);
- int free_share(ARCHIVE_SHARE *share);
- int rebuild_meta_file(char *table_name, File meta_file);
- int read_data_header(gzFile file_to_read);
- int write_data_header(gzFile file_to_write);
- void position(const byte *record);
- void info(uint);
- int extra(enum ha_extra_function operation);
- int reset(void);
- int external_lock(THD *thd, int lock_type);
- ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
- int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
- int optimize(THD* thd, HA_CHECK_OPT* check_opt);
- THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
- enum thr_lock_type lock_type);
- };
- bool archive_db_init(void);
- bool archive_db_end(void);