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/* Copyright (C) 2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <sys/types.h>
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#include "transparent_file.h"
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#define DEFAULT_CHAIN_LENGTH 512
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Version for file format.
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1 - Initial Version. That is, the version when the metafile was introduced.
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#define TINA_VERSION 1
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typedef struct st_tina_share {
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char data_file_name[FN_REFLEN];
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uint table_name_length, use_count;
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Below flag is needed to make log tables work with concurrent insert.
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For more details see comment to ha_tina::update_status.
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Here we save the length of the file for readers. This is updated by
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inserts, updates and deletes. The var is initialized along with the
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off_t saved_data_file_length;
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pthread_mutex_t mutex;
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bool update_file_opened;
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bool tina_write_opened;
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File meta_file; /* Meta file we use */
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File tina_write_filedes; /* File handler for readers */
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bool crashed; /* Meta file is crashed */
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ha_rows rows_recorded; /* Number of rows in tables */
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uint data_file_version; /* Version of the data file used */
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class ha_tina: public handler
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THR_LOCK_DATA lock; /* MySQL lock */
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TINA_SHARE *share; /* Shared lock info */
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off_t current_position; /* Current position in the file during a file scan */
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off_t next_position; /* Next position in the file scan */
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off_t local_saved_data_file_length; /* save position for reads */
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off_t temp_file_length;
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uchar byte_buffer[IO_SIZE];
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Transparent_file *file_buff;
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File data_file; /* File handler for readers */
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File update_temp_file;
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The chain contains "holes" in the file, occured because of
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deletes/updates. It is used in rnd_end() to get rid of them
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in the end of the query.
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tina_set chain_buffer[DEFAULT_CHAIN_LENGTH];
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uint local_data_file_version; /* Saved version of the data file used */
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bool records_is_known;
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bool get_write_pos(off_t *end_pos, tina_set *closest_hole);
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int open_update_temp_file_if_needed();
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int init_tina_writer();
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ha_tina(handlerton *hton, TABLE_SHARE *table_arg);
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const char *table_type() const { return "CSV"; }
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const char *index_type(uint inx) { return "NONE"; }
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const char **bas_ext() const;
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uint64_t table_flags() const
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return (HA_NO_TRANSACTIONS | HA_REC_NOT_IN_SEQ | HA_NO_AUTO_INCREMENT |
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HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE);
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ulong index_flags(uint idx, uint part, bool all_parts) const
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We will never have indexes so this will never be called(AKA we return
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uint max_record_length() const { return HA_MAX_REC_LENGTH; }
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uint max_keys() const { return 0; }
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uint max_key_parts() const { return 0; }
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uint max_key_length() const { return 0; }
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Called in test_quick_select to determine if indexes should be used.
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virtual double scan_time() { return (double) (stats.records+stats.deleted) / 20.0+10; }
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/* The next method will never be called */
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virtual bool fast_key_read() { return 1;}
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TODO: return actual upper bound of number of records in the table.
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(e.g. save number of records seen on full table scan and/or use file size
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ha_rows estimate_rows_upper_bound() { return HA_POS_ERROR; }
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int open(const char *name, int mode, uint open_options);
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int write_row(uchar * buf);
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int update_row(const uchar * old_data, uchar * new_data);
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int delete_row(const uchar * buf);
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int rnd_init(bool scan=1);
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int rnd_next(uchar *buf);
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int rnd_pos(uchar * buf, uchar *pos);
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bool check_and_repair(THD *thd);
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int check(THD* thd, HA_CHECK_OPT* check_opt);
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bool is_crashed() const;
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int repair(THD* thd, HA_CHECK_OPT* check_opt);
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/* This is required for SQL layer to know that we support autorepair */
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bool auto_repair() const { return 1; }
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void position(const uchar *record);
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int extra(enum ha_extra_function operation);
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int delete_all_rows(void);
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int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
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bool check_if_incompatible_data(HA_CREATE_INFO *info,
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THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
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enum thr_lock_type lock_type);
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These functions used to get/update status of the handler.
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Needed to enable concurrent inserts.
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void update_status();
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/* The following methods were added just for TINA */
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int encode_quote(uchar *buf);
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int find_current_row(uchar *buf);