path: root/storage/xtradb/handler/ha_innodb.h

/*****************************************************************************

Copyright (c) 2000, 2010, MySQL AB & Innobase Oy. All Rights Reserved.
   Use is subject to license terms

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., 
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

*****************************************************************************/

/*
  This file is based on ha_berkeley.h of MySQL distribution

  This file defines the Innodb handler: the interface between MySQL and
  Innodb
*/

#ifdef USE_PRAGMA_INTERFACE
#pragma interface			/* gcc class implementation */
#endif

#ifdef WITH_WSREP
#include "../../../wsrep/wsrep_api.h"
#endif /* WITH_WSREP */

/* Structure defines translation table between mysql index and innodb
index structures */
typedef struct innodb_idx_translate_struct {
	ulint		index_count;	/*!< number of valid index entries
					in the index_mapping array */
	ulint		array_size;	/*!< array size of index_mapping */
	dict_index_t**	index_mapping;	/*!< index pointer array directly
					maps to index in Innodb from MySQL
					array index */
} innodb_idx_translate_t;


/** InnoDB table share */
typedef struct st_innobase_share {
	THR_LOCK		lock;		/*!< MySQL lock protecting
						this structure */
	const char*		table_name;	/*!< InnoDB table name */
	uint			use_count;	/*!< reference count,
						incremented in get_share()
						and decremented in
						free_share() */
	void*			table_name_hash;/*!< hash table chain node */
	innodb_idx_translate_t	idx_trans_tbl;	/*!< index translation
						table between MySQL and
						Innodb */
	dict_table_t*		ib_table;
} INNOBASE_SHARE;


/** InnoDB B-tree index */
struct dict_index_struct;
/** Prebuilt structures in an Innobase table handle used within MySQL */
struct row_prebuilt_struct;

/** InnoDB B-tree index */
typedef struct dict_index_struct dict_index_t;
/** Prebuilt structures in an Innobase table handle used within MySQL */
typedef struct row_prebuilt_struct row_prebuilt_t;

/** The class defining a handle to an Innodb table */
class ha_innobase: public handler
{
	row_prebuilt_t*	prebuilt;	/*!< prebuilt struct in InnoDB, used
					to save CPU time with prebuilt data
					structures*/
	THD*		user_thd;	/*!< the thread handle of the user
					currently using the handle; this is
					set in external_lock function */
	THR_LOCK_DATA	lock;
	INNOBASE_SHARE*	share;		/*!< information for MySQL
					table locking */

	uchar*		upd_buf;	/*!< buffer used in updates */
	ulint		upd_buf_size;	/*!< the size of upd_buf in bytes */
	uchar		srch_key_val1[MAX_KEY_LENGTH + MAX_REF_PARTS*2];
	uchar		srch_key_val2[MAX_KEY_LENGTH + MAX_REF_PARTS*2];
					/*!< buffers used in converting
					search key values from MySQL format
					to InnoDB format. For each column
					2 bytes are used to store length,
					hence MAX_REF_PARTS*2. */
	Table_flags	int_table_flags;
	uint		primary_key;
	ulong		start_of_scan;	/*!< this is set to 1 when we are
					starting a table scan but have not
					yet fetched any row, else 0 */
	uint		last_match_mode;/* match mode of the latest search:
					ROW_SEL_EXACT, ROW_SEL_EXACT_PREFIX,
					or undefined */
	uint		num_write_row;	/*!< number of write_row() calls */

	uint store_key_val_for_row(uint keynr, char* buff, uint buff_len,
                                   const uchar* record);
	inline void update_thd(THD* thd);
	void update_thd();
	int change_active_index(uint keynr);
	int general_fetch(uchar* buf, uint direction, uint match_mode);
	ulint innobase_lock_autoinc();
	ulonglong innobase_peek_autoinc();
	ulint innobase_set_max_autoinc(ulonglong auto_inc);
	ulint innobase_reset_autoinc(ulonglong auto_inc);
	ulint innobase_get_autoinc(ulonglong* value);
	ulint innobase_update_autoinc(ulonglong	auto_inc);
	void innobase_initialize_autoinc();
	dict_index_t* innobase_get_index(uint keynr);
	int info_low(uint flag, bool called_from_analyze);

#ifdef WITH_WSREP
	int wsrep_append_keys(THD *thd, wsrep_key_type key_type,
			      const uchar* record0, const uchar* record1);
#endif
	/* Init values for the class: */
 public:
	ha_innobase(handlerton *hton, TABLE_SHARE *table_arg);
	~ha_innobase();
	/*
	  Get the row type from the storage engine.  If this method returns
	  ROW_TYPE_NOT_USED, the information in HA_CREATE_INFO should be used.
	*/
	enum row_type get_row_type() const;

	const char* table_type() const;
	const char* index_type(uint key_number);
	const char** bas_ext() const;
	Table_flags table_flags() const;
	ulong index_flags(uint idx, uint part, bool all_parts) const;
	uint max_supported_keys() const;
	uint max_supported_key_length() const;
	uint max_supported_key_part_length() const;
	const key_map* keys_to_use_for_scanning();

	int open(const char *name, int mode, uint test_if_locked);
	handler* clone(const char *name, MEM_ROOT *mem_root);
	int close(void);
	double scan_time();
	double read_time(uint index, uint ranges, ha_rows rows);
	my_bool is_fake_change_enabled(THD *thd);

	int write_row(uchar * buf);
	int update_row(const uchar * old_data, uchar * new_data);
	int delete_row(const uchar * buf);
	bool was_semi_consistent_read();
	void try_semi_consistent_read(bool yes);
	void unlock_row();

	int index_init(uint index, bool sorted);
	int index_end();
	int index_read(uchar * buf, const uchar * key,
		uint key_len, enum ha_rkey_function find_flag);
	int index_read_idx(uchar * buf, uint index, const uchar * key,
			   uint key_len, enum ha_rkey_function find_flag);
	int index_read_last(uchar * buf, const uchar * key, uint key_len);
	int index_next(uchar * buf);
	int index_next_same(uchar * buf, const uchar *key, uint keylen);
	int index_prev(uchar * buf);
	int index_first(uchar * buf);
	int index_last(uchar * buf);

	int rnd_init(bool scan);
	int rnd_end();
	int rnd_next(uchar *buf);
	int rnd_pos(uchar * buf, uchar *pos);

	void position(const uchar *record);
	int info(uint);
	int analyze(THD* thd,HA_CHECK_OPT* check_opt);
	int optimize(THD* thd,HA_CHECK_OPT* check_opt);
	int discard_or_import_tablespace(my_bool discard);
	int extra(enum ha_extra_function operation);
        int reset();
	int external_lock(THD *thd, int lock_type);
	int transactional_table_lock(THD *thd, int lock_type);
	int start_stmt(THD *thd, thr_lock_type lock_type);
	void position(uchar *record);
	ha_rows records_in_range(uint inx, key_range *min_key, key_range
								*max_key);
	ha_rows estimate_rows_upper_bound();

	void update_create_info(HA_CREATE_INFO* create_info);
	int create(const char *name, register TABLE *form,
					HA_CREATE_INFO *create_info);
	int truncate();
	int delete_table(const char *name);
	int rename_table(const char* from, const char* to);
	int check(THD* thd, HA_CHECK_OPT* check_opt);
	char* update_table_comment(const char* comment);
	char* get_foreign_key_create_info();
	int get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list);
	int get_parent_foreign_key_list(THD *thd,
					List<FOREIGN_KEY_INFO> *f_key_list);
	bool can_switch_engines();
	uint referenced_by_foreign_key();
	void free_foreign_key_create_info(char* str);
	THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
					enum thr_lock_type lock_type);
	void init_table_handle_for_HANDLER();
        virtual void get_auto_increment(ulonglong offset, ulonglong increment,
                                        ulonglong nb_desired_values,
                                        ulonglong *first_value,
                                        ulonglong *nb_reserved_values);
	int reset_auto_increment(ulonglong value);

	virtual bool get_error_message(int error, String *buf);

	uint8 table_cache_type();
	/*
	  ask handler about permission to cache table during query registration
	*/
	my_bool register_query_cache_table(THD *thd, char *table_key,
					   uint key_length,
					   qc_engine_callback *call_back,
					   ulonglong *engine_data);
	static char *get_mysql_bin_log_name();
	static ulonglong get_mysql_bin_log_pos();
	bool primary_key_is_clustered();
	int cmp_ref(const uchar *ref1, const uchar *ref2);
	/** Fast index creation (smart ALTER TABLE) @see handler0alter.cc @{ */
	int add_index(TABLE *table_arg, KEY *key_info, uint num_of_keys,
		      handler_add_index **add);
	int final_add_index(handler_add_index *add, bool commit);
	int prepare_drop_index(TABLE *table_arg, uint *key_num,
			       uint num_of_keys);
	int final_drop_index(TABLE *table_arg);
	/** @} */
	bool check_if_incompatible_data(HA_CREATE_INFO *info,
					uint table_changes);
	uint alter_table_flags(uint flags);
	bool check_if_supported_virtual_columns(void) { return TRUE; }

private:
	/** Builds a 'template' to the prebuilt struct.

	The template is used in fast retrieval of just those column
	values MySQL needs in its processing.
	@param whole_row true if access is needed to a whole row,
	false if accessing individual fields is enough */
	void build_template(bool whole_row);
	/** Resets a query execution 'template'.
	@see build_template() */
	inline void reset_template();

public:
	/** @name Multi Range Read interface @{ */
	/** Initialize multi range read @see DsMrr_impl::dsmrr_init
	* @param seq
	* @param seq_init_param
	* @param n_ranges
	* @param mode
	* @param buf
        */
	int multi_range_read_init(RANGE_SEQ_IF* seq,
				  void* seq_init_param,
                                  uint n_ranges, uint mode,
                                  HANDLER_BUFFER *buf);
	/** Process next multi range read @see DsMrr_impl::dsmrr_next
	* @param range_info
	*/
        int multi_range_read_next(range_id_t *range_info);
	/** Initialize multi range read and get information.
	* @see ha_myisam::multi_range_read_info_const
	* @see DsMrr_impl::dsmrr_info_const
	* @param keyno
	* @param seq
	* @param seq_init_param
	* @param n_ranges
	* @param bufsz
	* @param flags
	* @param cost
	*/
        ha_rows multi_range_read_info_const(uint keyno, RANGE_SEQ_IF *seq,
                                            void *seq_init_param, 
                                            uint n_ranges, uint *bufsz,
                                            uint *flags, COST_VECT *cost);
	/** Initialize multi range read and get information.
	* @see DsMrr_impl::dsmrr_info
	* @param keyno
        * @param n_ranges
        * @param keys
        * @param key_parts
	* @param bufsz
	* @param flags
	* @param cost
	*/
        ha_rows multi_range_read_info(uint keyno, uint n_ranges, uint keys,
                                      uint key_parts, uint *bufsz, 
                                      uint *flags, COST_VECT *cost);
        int multi_range_read_explain_info(uint mrr_mode,
                                          char *str, size_t size);

	/** Attempt to push down an index condition.
	* @param[in] keyno	MySQL key number
	* @param[in] idx_cond	Index condition to be checked
	* @return idx_cond if pushed; NULL if not pushed
	*/
	class Item* idx_cond_push(uint keyno, class Item* idx_cond);

        /* An helper function for index_cond_func_innodb: */
        bool is_thd_killed();

private:
	/** The multi range read session object */
        DsMrr_impl ds_mrr;

	/* @} */
};

/* Some accessor functions which the InnoDB plugin needs, but which
can not be added to mysql/plugin.h as part of the public interface;
the definitions are bracketed with #ifdef INNODB_COMPATIBILITY_HOOKS */

#ifndef INNODB_COMPATIBILITY_HOOKS
#error InnoDB needs MySQL to be built with #define INNODB_COMPATIBILITY_HOOKS
#endif

extern "C" {
struct charset_info_st *thd_charset(MYSQL_THD thd);
LEX_STRING *thd_query_string(MYSQL_THD thd);

/**
  Check if a user thread is a replication slave thread
  @param thd  user thread
  @retval 0 the user thread is not a replication slave thread
  @retval 1 the user thread is a replication slave thread
*/
int thd_slave_thread(const MYSQL_THD thd);

/**
  Check if a user thread is running a non-transactional update
  @param thd  user thread
  @retval 0 the user thread is not running a non-transactional update
  @retval 1 the user thread is running a non-transactional update
*/
int thd_non_transactional_update(const MYSQL_THD thd);

/**
  Get the user thread's binary logging format
  @param thd  user thread
  @return Value to be used as index into the binlog_format_names array
*/
int thd_binlog_format(const MYSQL_THD thd);

/**
  Mark transaction to rollback and mark error as fatal to a sub-statement.
  @param  thd   Thread handle
  @param  all   TRUE <=> rollback main transaction.
*/
void thd_mark_transaction_to_rollback(MYSQL_THD thd, bool all);

/**
  Check if binary logging is filtered for thread's current db.
  @param  thd   Thread handle
  @retval 1 the query is not filtered, 0 otherwise.
*/
bool thd_binlog_filter_ok(const MYSQL_THD thd);

/**
  Check if the query may generate row changes which
  may end up in the binary.
  @param  thd   Thread handle
  @return 1 the query may generate row changes, 0 otherwise.
*/
bool thd_sqlcom_can_generate_row_events(const MYSQL_THD thd);
}

/** Get the file name and position of the MySQL binlog corresponding to the
 * current commit.
 */
extern void mysql_bin_log_commit_pos(THD *thd, ulonglong *out_pos, const char **out_file);

#ifdef WITH_WSREP
#include <wsrep_mysqld.h>
//extern "C" int wsrep_trx_order_before(void *thd1, void *thd2);

extern "C" bool wsrep_thd_is_wsrep_on(THD *thd);

extern "C" enum wsrep_exec_mode wsrep_thd_exec_mode(THD *thd);
extern "C" enum wsrep_conflict_state wsrep_thd_conflict_state(THD *thd);
extern "C" enum wsrep_query_state wsrep_thd_query_state(THD *thd);
extern "C" const char * wsrep_thd_exec_mode_str(THD *thd);
extern "C" const char * wsrep_thd_conflict_state_str(THD *thd);
extern "C" const char * wsrep_thd_query_state_str(THD *thd);
extern "C" wsrep_ws_handle_t* wsrep_thd_ws_handle(THD *thd);

extern "C" void wsrep_thd_set_exec_mode(THD *thd, enum wsrep_exec_mode mode);
extern "C" void wsrep_thd_set_query_state(
	THD *thd, enum wsrep_query_state state);
extern "C" void wsrep_thd_set_conflict_state(
	THD *thd, enum wsrep_conflict_state state);

extern "C" void wsrep_thd_set_trx_to_replay(THD *thd, uint64 trx_id);

extern "C" void wsrep_thd_LOCK(THD *thd);
extern "C" void wsrep_thd_UNLOCK(THD *thd);
extern "C" uint32 wsrep_thd_wsrep_rand(THD *thd);
extern "C" time_t wsrep_thd_query_start(THD *thd);
extern "C" my_thread_id wsrep_thd_thread_id(THD *thd);
extern "C" int64_t wsrep_thd_trx_seqno(THD *thd);
extern "C" query_id_t wsrep_thd_query_id(THD *thd);
extern "C" char * wsrep_thd_query(THD *thd);
extern "C" query_id_t wsrep_thd_wsrep_last_query_id(THD *thd);
extern "C" void wsrep_thd_set_wsrep_last_query_id(THD *thd, query_id_t id);
extern "C" void wsrep_thd_awake(THD* bf_thd, THD *thd, my_bool signal);
#endif
typedef struct trx_struct trx_t;
/********************************************************************//**
@file handler/ha_innodb.h
Converts an InnoDB error code to a MySQL error code and also tells to MySQL
about a possible transaction rollback inside InnoDB caused by a lock wait
timeout or a deadlock.
@return	MySQL error code */
extern "C"
int
convert_error_code_to_mysql(
/*========================*/
	int		error,	/*!< in: InnoDB error code */
	ulint		flags,	/*!< in: InnoDB table flags, or 0 */
	MYSQL_THD	thd);	/*!< in: user thread handle or NULL */

/*********************************************************************//**
Allocates an InnoDB transaction for a MySQL handler object.
@return	InnoDB transaction handle */
extern "C"
trx_t*
innobase_trx_allocate(
/*==================*/
	MYSQL_THD	thd);	/*!< in: user thread handle */


/*********************************************************************//**
This function checks each index name for a table against reserved
system default primary index name 'GEN_CLUST_INDEX'. If a name
matches, this function pushes an warning message to the client,
and returns true.
@return true if the index name matches the reserved name */
extern "C"
bool
innobase_index_name_is_reserved(
/*============================*/
	THD*		thd,		/*!< in/out: MySQL connection */
	const KEY*	key_info,	/*!< in: Indexes to be created */
	ulint		num_of_keys);	/*!< in: Number of indexes to
					be created. */

/*******************************************************************//**
This function builds a translation table in INNOBASE_SHARE
structure for fast index location with mysql array number from its
table->key_info structure. This also provides the necessary translation
between the key order in mysql key_info and Innodb ib_table->indexes if
they are not fully matched with each other.
Note we do not have any mutex protecting the translation table
building based on the assumption that there is no concurrent
index creation/drop and DMLs that requires index lookup. All table
handle will be closed before the index creation/drop.
@return TRUE if index translation table built successfully */
UNIV_INTERN
ibool
innobase_build_index_translation(
/*=============================*/
	const TABLE*		table,	  /*!< in: table in MySQL data
					  dictionary */
	dict_table_t*		ib_table, /*!< in: table in Innodb data
					  dictionary */
	INNOBASE_SHARE*		share);	  /*!< in/out: share structure
					  where index translation table
					  will be constructed in. */

#ifdef WITH_WSREP
extern "C" int wsrep_trx_is_aborting(void *thd_ptr);
#endif