165 lines
6.2 KiB
C++
165 lines
6.2 KiB
C++
/*
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Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file storage/myisammrg/ha_myisammrg.h
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MyISAM merge storage engine.
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*/
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#include <sys/types.h>
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#include "lex_string.h"
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#include "my_double2ulonglong.h"
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#include "my_inttypes.h"
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#include "my_io.h"
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#include "myisammrg.h"
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#include "sql/handler.h"
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#include "sql/table.h"
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/**
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Represents one name of a MERGE child.
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@todo Add MYRG_SHARE and store children names in the
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share.
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*/
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class Mrg_child_def {
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/* Remembered MERGE child def version. See top comment in ha_myisammrg.cc */
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enum_table_ref_type m_child_table_ref_type;
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ulonglong m_child_def_version;
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public:
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LEX_STRING db;
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LEX_STRING name;
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/* Access MERGE child def version. See top comment in ha_myisammrg.cc */
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inline enum_table_ref_type get_child_table_ref_type() {
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return m_child_table_ref_type;
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}
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inline ulonglong get_child_def_version() { return m_child_def_version; }
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inline void set_child_def_version(enum_table_ref_type child_table_ref_type,
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ulonglong version) {
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m_child_table_ref_type = child_table_ref_type;
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m_child_def_version = version;
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}
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Mrg_child_def(char *db_arg, size_t db_len_arg, char *table_name_arg,
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size_t table_name_len_arg) {
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db.str = db_arg;
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db.length = db_len_arg;
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name.str = table_name_arg;
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name.length = table_name_len_arg;
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m_child_def_version = ~0ULL;
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m_child_table_ref_type = TABLE_REF_NULL;
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}
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};
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class ha_myisammrg : public handler {
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MYRG_INFO *file;
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bool is_cloned; /* This instance has been cloned */
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public:
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MEM_ROOT children_mem_root; /* mem root for children list */
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List<Mrg_child_def> child_def_list;
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TABLE_LIST *children_l; /* children list */
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TABLE_LIST **children_last_l; /* children list end */
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uint test_if_locked; /* flags from ::open() */
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ha_myisammrg(handlerton *hton, TABLE_SHARE *table_arg);
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~ha_myisammrg();
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const char *table_type() const { return "MRG_MyISAM"; }
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virtual enum ha_key_alg get_default_index_algorithm() const {
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return HA_KEY_ALG_BTREE;
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}
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virtual bool is_index_algorithm_supported(enum ha_key_alg key_alg) const {
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return key_alg == HA_KEY_ALG_BTREE || key_alg == HA_KEY_ALG_RTREE;
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}
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ulonglong table_flags() const {
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return (HA_AUTO_PART_KEY | HA_NO_TRANSACTIONS | HA_BINLOG_ROW_CAPABLE |
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HA_BINLOG_STMT_CAPABLE | HA_NULL_IN_KEY | HA_CAN_INDEX_BLOBS |
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HA_FILE_BASED | HA_ANY_INDEX_MAY_BE_UNIQUE | HA_CAN_BIT_FIELD |
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HA_COUNT_ROWS_INSTANT | HA_NO_COPY_ON_ALTER | HA_DUPLICATE_POS);
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}
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ulong index_flags(uint inx, uint, bool) const {
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return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT)
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? 0
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: HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE | HA_READ_ORDER |
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HA_KEYREAD_ONLY);
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}
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uint max_supported_keys() const { return MI_MAX_KEY; }
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uint max_supported_key_length() const { return MI_MAX_KEY_LENGTH; }
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uint max_supported_key_part_length(
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HA_CREATE_INFO *create_info MY_ATTRIBUTE((unused))) const {
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return MI_MAX_KEY_LENGTH;
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}
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double scan_time() {
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return ulonglong2double(stats.data_file_length) / IO_SIZE + file->tables;
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}
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int open(const char *name, int mode, uint test_if_locked_arg,
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const dd::Table *table_def);
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int add_children_list(void);
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int attach_children(void);
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int detach_children(void);
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virtual handler *clone(const char *name, MEM_ROOT *mem_root);
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int close(void);
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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 index_read_map(uchar *buf, const uchar *key, key_part_map keypart_map,
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enum ha_rkey_function find_flag);
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int index_read_idx_map(uchar *buf, uint index, const uchar *key,
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key_part_map keypart_map,
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enum ha_rkey_function find_flag);
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int index_read_last_map(uchar *buf, const uchar *key,
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key_part_map keypart_map);
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int index_next(uchar *buf);
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int index_prev(uchar *buf);
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int index_first(uchar *buf);
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int index_last(uchar *buf);
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int index_next_same(uchar *buf, const uchar *key, uint keylen);
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int rnd_init(bool scan);
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int rnd_next(uchar *buf);
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int rnd_pos(uchar *buf, uchar *pos);
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void position(const uchar *record);
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ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
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int truncate(dd::Table *table_def);
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int info(uint);
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int reset(void);
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int extra(enum ha_extra_function operation);
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int extra_opt(enum ha_extra_function operation, ulong cache_size);
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int external_lock(THD *thd, int lock_type);
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uint lock_count(void) const;
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int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info,
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dd::Table *table_def);
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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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void update_create_info(HA_CREATE_INFO *create_info);
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void append_create_info(String *packet);
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MYRG_INFO *myrg_info() { return file; }
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TABLE *table_ptr() { return table; }
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bool check_if_incompatible_data(HA_CREATE_INFO *info, uint table_changes);
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int check(THD *thd, HA_CHECK_OPT *check_opt);
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virtual int records(ha_rows *num_rows);
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};
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