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/* 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; version 2 of the License.
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 */
#include <sys/types.h>
#include <sys/stat.h>
#include <my_dir.h>
#include "transparent_file.h"
#define DEFAULT_CHAIN_LENGTH 512
/*
Version for file format.
1 - Initial Version. That is, the version when the metafile was introduced.
*/
#define TINA_VERSION 1
typedef struct st_tina_share {
char *table_name;
char data_file_name[FN_REFLEN];
uint table_name_length, use_count;
/*
Below flag is needed to make log tables work with concurrent insert.
For more details see comment to ha_tina::update_status.
*/
my_bool is_log_table;
/*
Here we save the length of the file for readers. This is updated by
inserts, updates and deletes. The var is initialized along with the
share initialization.
*/
my_off_t saved_data_file_length;
pthread_mutex_t mutex;
THR_LOCK lock;
bool update_file_opened;
bool tina_write_opened;
File meta_file; /* Meta file we use */
File tina_write_filedes; /* File handler for readers */
bool crashed; /* Meta file is crashed */
ha_rows rows_recorded; /* Number of rows in tables */
uint data_file_version; /* Version of the data file used */
} TINA_SHARE;
struct tina_set {
my_off_t begin;
my_off_t end;
};
class ha_tina: public handler
{
THR_LOCK_DATA lock; /* MySQL lock */
TINA_SHARE *share; /* Shared lock info */
my_off_t current_position; /* Current position in the file during a file scan */
my_off_t next_position; /* Next position in the file scan */
my_off_t local_saved_data_file_length; /* save position for reads */
my_off_t temp_file_length;
uchar byte_buffer[IO_SIZE];
Transparent_file *file_buff;
File data_file; /* File handler for readers */
File update_temp_file;
String buffer;
/*
The chain contains "holes" in the file, occured because of
deletes/updates. It is used in rnd_end() to get rid of them
in the end of the query.
*/
tina_set chain_buffer[DEFAULT_CHAIN_LENGTH];
tina_set *chain;
tina_set *chain_ptr;
uchar chain_alloced;
uint32 chain_size;
uint local_data_file_version; /* Saved version of the data file used */
bool records_is_known;
MEM_ROOT blobroot;
private:
bool get_write_pos(my_off_t *end_pos, tina_set *closest_hole);
int open_update_temp_file_if_needed();
int init_tina_writer();
int init_data_file();
public:
ha_tina(handlerton *hton, TABLE_SHARE *table_arg);
~ha_tina()
{
if (chain_alloced)
my_free(chain, 0);
if (file_buff)
delete file_buff;
}
const char *table_type() const { return "CSV"; }
const char *index_type(uint inx) { return "NONE"; }
const char **bas_ext() const;
ulonglong table_flags() const
{
return (HA_NO_TRANSACTIONS | HA_REC_NOT_IN_SEQ | HA_NO_AUTO_INCREMENT |
HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE);
}
ulong index_flags(uint idx, uint part, bool all_parts) const
{
/*
We will never have indexes so this will never be called(AKA we return
zero)
*/
return 0;
}
uint max_record_length() const { return HA_MAX_REC_LENGTH; }
uint max_keys() const { return 0; }
uint max_key_parts() const { return 0; }
uint max_key_length() const { return 0; }
/*
Called in test_quick_select to determine if indexes should be used.
*/
virtual double scan_time() { return (double) (stats.records+stats.deleted) / 20.0+10; }
/* The next method will never be called */
virtual bool fast_key_read() { return 1;}
/*
TODO: return actual upper bound of number of records in the table.
(e.g. save number of records seen on full table scan and/or use file size
as upper bound)
*/
ha_rows estimate_rows_upper_bound() { return HA_POS_ERROR; }
int open(const char *name, int mode, uint open_options);
int close(void);
int write_row(uchar * buf);
int update_row(const uchar * old_data, uchar * new_data);
int delete_row(const uchar * buf);
int rnd_init(bool scan=1);
int rnd_next(uchar *buf);
int rnd_pos(uchar * buf, uchar *pos);
bool check_and_repair(THD *thd);
int check(THD* thd, HA_CHECK_OPT* check_opt);
bool is_crashed() const;
int rnd_end();
int repair(THD* thd, HA_CHECK_OPT* check_opt);
/* This is required for SQL layer to know that we support autorepair */
bool auto_repair() const { return 1; }
void position(const uchar *record);
int info(uint);
int extra(enum ha_extra_function operation);
int delete_all_rows(void);
int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
bool check_if_incompatible_data(HA_CREATE_INFO *info,
uint table_changes);
THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
enum thr_lock_type lock_type);
/*
These functions used to get/update status of the handler.
Needed to enable concurrent inserts.
*/
void get_status();
void update_status();
/* The following methods were added just for TINA */
int encode_quote(uchar *buf);
int find_current_row(uchar *buf);
int chain_append();
};
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