set_var.h
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:27k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */
- /* Classes to support the SET command */
- #ifdef USE_PRAGMA_INTERFACE
- #pragma interface /* gcc class implementation */
- #endif
- /****************************************************************************
- Variables that are changable runtime are declared using the
- following classes
- ****************************************************************************/
- class sys_var;
- class set_var;
- typedef struct system_variables SV;
- extern TYPELIB bool_typelib, delay_key_write_typelib, sql_mode_typelib;
- typedef int (*sys_check_func)(THD *, set_var *);
- typedef bool (*sys_update_func)(THD *, set_var *);
- typedef void (*sys_after_update_func)(THD *,enum_var_type);
- typedef void (*sys_set_default_func)(THD *, enum_var_type);
- typedef byte *(*sys_value_ptr_func)(THD *thd);
- class sys_var
- {
- public:
- struct my_option *option_limits; /* Updated by by set_var_init() */
- uint name_length; /* Updated by by set_var_init() */
- const char *name;
-
- sys_after_update_func after_update;
- #if MYSQL_VERSION_ID < 50000
- bool no_support_one_shot;
- #endif
- sys_var(const char *name_arg)
- :name(name_arg), after_update(0)
- #if MYSQL_VERSION_ID < 50000
- , no_support_one_shot(1)
- #endif
- {}
- sys_var(const char *name_arg,sys_after_update_func func)
- :name(name_arg), after_update(func)
- #if MYSQL_VERSION_ID < 50000
- , no_support_one_shot(1)
- #endif
- {}
- virtual ~sys_var() {}
- virtual bool check(THD *thd, set_var *var);
- bool check_enum(THD *thd, set_var *var, TYPELIB *enum_names);
- bool check_set(THD *thd, set_var *var, TYPELIB *enum_names);
- virtual bool update(THD *thd, set_var *var)=0;
- virtual void set_default(THD *thd, enum_var_type type) {}
- virtual SHOW_TYPE type() { return SHOW_UNDEF; }
- virtual byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
- { return 0; }
- virtual bool check_type(enum_var_type type)
- { return type != OPT_GLOBAL; } /* Error if not GLOBAL */
- virtual bool check_update_type(Item_result type)
- { return type != INT_RESULT; } /* Assume INT */
- virtual bool check_default(enum_var_type type)
- { return option_limits == 0; }
- Item *item(THD *thd, enum_var_type type, LEX_STRING *base);
- virtual bool is_struct() { return 0; }
- };
- class sys_var_long_ptr :public sys_var
- {
- public:
- ulong *value;
- sys_var_long_ptr(const char *name_arg, ulong *value_ptr)
- :sys_var(name_arg),value(value_ptr) {}
- sys_var_long_ptr(const char *name_arg, ulong *value_ptr,
- sys_after_update_func func)
- :sys_var(name_arg,func), value(value_ptr) {}
- bool check(THD *thd, set_var *var);
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_LONG; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
- { return (byte*) value; }
- };
- class sys_var_ulonglong_ptr :public sys_var
- {
- public:
- ulonglong *value;
- sys_var_ulonglong_ptr(const char *name_arg, ulonglong *value_ptr)
- :sys_var(name_arg),value(value_ptr) {}
- sys_var_ulonglong_ptr(const char *name_arg, ulonglong *value_ptr,
- sys_after_update_func func)
- :sys_var(name_arg,func), value(value_ptr) {}
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_LONGLONG; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
- { return (byte*) value; }
- };
- class sys_var_bool_ptr :public sys_var
- {
- public:
- my_bool *value;
- sys_var_bool_ptr(const char *name_arg, my_bool *value_arg)
- :sys_var(name_arg),value(value_arg)
- {}
- bool check(THD *thd, set_var *var)
- {
- return check_enum(thd, var, &bool_typelib);
- }
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_MY_BOOL; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
- { return (byte*) value; }
- bool check_update_type(Item_result type) { return 0; }
- };
- class sys_var_str :public sys_var
- {
- public:
- char *value; // Pointer to allocated string
- uint value_length;
- sys_check_func check_func;
- sys_update_func update_func;
- sys_set_default_func set_default_func;
- sys_var_str(const char *name_arg,
- sys_check_func check_func_arg,
- sys_update_func update_func_arg,
- sys_set_default_func set_default_func_arg,
- char *value_arg)
- :sys_var(name_arg), value(value_arg), check_func(check_func_arg),
- update_func(update_func_arg),set_default_func(set_default_func_arg)
- {}
- bool check(THD *thd, set_var *var);
- bool update(THD *thd, set_var *var)
- {
- return (*update_func)(thd, var);
- }
- void set_default(THD *thd, enum_var_type type)
- {
- (*set_default_func)(thd, type);
- }
- SHOW_TYPE type() { return SHOW_CHAR; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
- { return (byte*) value; }
- bool check_update_type(Item_result type)
- {
- return type != STRING_RESULT; /* Only accept strings */
- }
- bool check_default(enum_var_type type) { return 0; }
- };
- class sys_var_const_str :public sys_var
- {
- public:
- char *value; // Pointer to const value
- sys_var_const_str(const char *name_arg, const char *value_arg)
- :sys_var(name_arg), value((char*) value_arg)
- {}
- bool check(THD *thd, set_var *var)
- {
- return 1;
- }
- bool update(THD *thd, set_var *var)
- {
- return 1;
- }
- SHOW_TYPE type() { return SHOW_CHAR; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
- {
- return (byte*) value;
- }
- bool check_update_type(Item_result type)
- {
- return 1;
- }
- bool check_default(enum_var_type type) { return 1; }
- };
- class sys_var_enum :public sys_var
- {
- uint *value;
- TYPELIB *enum_names;
- public:
- sys_var_enum(const char *name_arg, uint *value_arg,
- TYPELIB *typelib, sys_after_update_func func)
- :sys_var(name_arg,func), value(value_arg), enum_names(typelib)
- {}
- bool check(THD *thd, set_var *var)
- {
- return check_enum(thd, var, enum_names);
- }
- bool update(THD *thd, set_var *var);
- SHOW_TYPE type() { return SHOW_CHAR; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- bool check_update_type(Item_result type) { return 0; }
- };
- class sys_var_thd :public sys_var
- {
- public:
- sys_var_thd(const char *name_arg)
- :sys_var(name_arg)
- {}
- sys_var_thd(const char *name_arg, sys_after_update_func func)
- :sys_var(name_arg,func)
- {}
- bool check_type(enum_var_type type) { return 0; }
- bool check_default(enum_var_type type)
- {
- return type == OPT_GLOBAL && !option_limits;
- }
- };
- class sys_var_thd_ulong :public sys_var_thd
- {
- sys_check_func check_func;
- public:
- ulong SV::*offset;
- sys_var_thd_ulong(const char *name_arg, ulong SV::*offset_arg)
- :sys_var_thd(name_arg), check_func(0), offset(offset_arg)
- {}
- sys_var_thd_ulong(const char *name_arg, ulong SV::*offset_arg,
- sys_check_func c_func, sys_after_update_func au_func)
- :sys_var_thd(name_arg,au_func), check_func(c_func), offset(offset_arg)
- {}
- bool check(THD *thd, set_var *var);
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_LONG; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_thd_ha_rows :public sys_var_thd
- {
- public:
- ha_rows SV::*offset;
- sys_var_thd_ha_rows(const char *name_arg, ha_rows SV::*offset_arg)
- :sys_var_thd(name_arg), offset(offset_arg)
- {}
- sys_var_thd_ha_rows(const char *name_arg, ha_rows SV::*offset_arg,
- sys_after_update_func func)
- :sys_var_thd(name_arg,func), offset(offset_arg)
- {}
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_HA_ROWS; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_thd_ulonglong :public sys_var_thd
- {
- public:
- ulonglong SV::*offset;
- bool only_global;
- sys_var_thd_ulonglong(const char *name_arg, ulonglong SV::*offset_arg)
- :sys_var_thd(name_arg), offset(offset_arg)
- {}
- sys_var_thd_ulonglong(const char *name_arg, ulonglong SV::*offset_arg,
- sys_after_update_func func, bool only_global_arg)
- :sys_var_thd(name_arg, func), offset(offset_arg),
- only_global(only_global_arg)
- {}
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_LONGLONG; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- bool check_default(enum_var_type type)
- {
- return type == OPT_GLOBAL && !option_limits;
- }
- bool check_type(enum_var_type type)
- {
- return (only_global && type != OPT_GLOBAL);
- }
- };
- class sys_var_thd_bool :public sys_var_thd
- {
- public:
- my_bool SV::*offset;
- sys_var_thd_bool(const char *name_arg, my_bool SV::*offset_arg)
- :sys_var_thd(name_arg), offset(offset_arg)
- {}
- sys_var_thd_bool(const char *name_arg, my_bool SV::*offset_arg,
- sys_after_update_func func)
- :sys_var_thd(name_arg,func), offset(offset_arg)
- {}
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_MY_BOOL; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- bool check(THD *thd, set_var *var)
- {
- return check_enum(thd, var, &bool_typelib);
- }
- bool check_update_type(Item_result type) { return 0; }
- };
- class sys_var_thd_enum :public sys_var_thd
- {
- protected:
- ulong SV::*offset;
- TYPELIB *enum_names;
- public:
- sys_var_thd_enum(const char *name_arg, ulong SV::*offset_arg,
- TYPELIB *typelib)
- :sys_var_thd(name_arg), offset(offset_arg), enum_names(typelib)
- {}
- sys_var_thd_enum(const char *name_arg, ulong SV::*offset_arg,
- TYPELIB *typelib,
- sys_after_update_func func)
- :sys_var_thd(name_arg,func), offset(offset_arg), enum_names(typelib)
- {}
- bool check(THD *thd, set_var *var)
- {
- return check_enum(thd, var, enum_names);
- }
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- SHOW_TYPE type() { return SHOW_CHAR; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- bool check_update_type(Item_result type) { return 0; }
- };
- extern void fix_sql_mode_var(THD *thd, enum_var_type type);
- class sys_var_thd_sql_mode :public sys_var_thd_enum
- {
- public:
- sys_var_thd_sql_mode(const char *name_arg, ulong SV::*offset_arg)
- :sys_var_thd_enum(name_arg, offset_arg, &sql_mode_typelib,
- fix_sql_mode_var)
- {}
- bool check(THD *thd, set_var *var)
- {
- return check_set(thd, var, enum_names);
- }
- void set_default(THD *thd, enum_var_type type);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_thd_storage_engine :public sys_var_thd
- {
- protected:
- ulong SV::*offset;
- public:
- sys_var_thd_storage_engine(const char *name_arg, ulong SV::*offset_arg)
- :sys_var_thd(name_arg), offset(offset_arg)
- {}
- bool check(THD *thd, set_var *var);
- SHOW_TYPE type() { return SHOW_CHAR; }
- bool check_update_type(Item_result type)
- {
- return type != STRING_RESULT; /* Only accept strings */
- }
- void set_default(THD *thd, enum_var_type type);
- bool update(THD *thd, set_var *var);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_thd_table_type :public sys_var_thd_storage_engine
- {
- public:
- sys_var_thd_table_type(const char *name_arg, ulong SV::*offset_arg)
- :sys_var_thd_storage_engine(name_arg, offset_arg)
- {}
- void warn_deprecated(THD *thd);
- void set_default(THD *thd, enum_var_type type);
- bool update(THD *thd, set_var *var);
- };
- class sys_var_thd_bit :public sys_var_thd
- {
- sys_check_func check_func;
- sys_update_func update_func;
- public:
- ulong bit_flag;
- bool reverse;
- sys_var_thd_bit(const char *name_arg,
- sys_check_func c_func, sys_update_func u_func,
- ulong bit, bool reverse_arg=0)
- :sys_var_thd(name_arg), check_func(c_func), update_func(u_func),
- bit_flag(bit), reverse(reverse_arg)
- {}
- bool check(THD *thd, set_var *var);
- bool update(THD *thd, set_var *var);
- bool check_update_type(Item_result type) { return 0; }
- bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
- SHOW_TYPE type() { return SHOW_MY_BOOL; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- /* some variables that require special handling */
- class sys_var_timestamp :public sys_var
- {
- public:
- sys_var_timestamp(const char *name_arg) :sys_var(name_arg) {}
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
- bool check_default(enum_var_type type) { return 0; }
- SHOW_TYPE type() { return SHOW_LONG; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_last_insert_id :public sys_var
- {
- public:
- sys_var_last_insert_id(const char *name_arg) :sys_var(name_arg) {}
- bool update(THD *thd, set_var *var);
- bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
- SHOW_TYPE type() { return SHOW_LONGLONG; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_insert_id :public sys_var
- {
- public:
- sys_var_insert_id(const char *name_arg) :sys_var(name_arg) {}
- bool update(THD *thd, set_var *var);
- bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
- SHOW_TYPE type() { return SHOW_LONGLONG; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- #ifdef HAVE_REPLICATION
- class sys_var_slave_skip_counter :public sys_var
- {
- public:
- sys_var_slave_skip_counter(const char *name_arg) :sys_var(name_arg) {}
- bool check(THD *thd, set_var *var);
- bool update(THD *thd, set_var *var);
- bool check_type(enum_var_type type) { return type != OPT_GLOBAL; }
- /*
- We can't retrieve the value of this, so we don't have to define
- type() or value_ptr()
- */
- };
- class sys_var_sync_binlog_period :public sys_var_long_ptr
- {
- public:
- sys_var_sync_binlog_period(const char *name_arg, ulong *value_ptr)
- :sys_var_long_ptr(name_arg,value_ptr) {}
- bool update(THD *thd, set_var *var);
- };
- #endif
- class sys_var_rand_seed1 :public sys_var
- {
- public:
- sys_var_rand_seed1(const char *name_arg) :sys_var(name_arg) {}
- bool update(THD *thd, set_var *var);
- bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
- };
- class sys_var_rand_seed2 :public sys_var
- {
- public:
- sys_var_rand_seed2(const char *name_arg) :sys_var(name_arg) {}
- bool update(THD *thd, set_var *var);
- bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
- };
- class sys_var_collation :public sys_var_thd
- {
- public:
- sys_var_collation(const char *name_arg) :sys_var_thd(name_arg)
- {
- #if MYSQL_VERSION_ID < 50000
- no_support_one_shot= 0;
- #endif
- }
- bool check(THD *thd, set_var *var);
- SHOW_TYPE type() { return SHOW_CHAR; }
- bool check_update_type(Item_result type)
- {
- return ((type != STRING_RESULT) && (type != INT_RESULT));
- }
- bool check_default(enum_var_type type) { return 0; }
- virtual void set_default(THD *thd, enum_var_type type)= 0;
- };
- class sys_var_character_set :public sys_var_thd
- {
- public:
- bool nullable;
- sys_var_character_set(const char *name_arg) :
- sys_var_thd(name_arg)
- {
- nullable= 0;
- #if MYSQL_VERSION_ID < 50000
- /*
- In fact only almost all variables derived from sys_var_character_set
- support ONE_SHOT; character_set_results doesn't. But that's good enough.
- */
- no_support_one_shot= 0;
- #endif
- }
- bool check(THD *thd, set_var *var);
- SHOW_TYPE type() { return SHOW_CHAR; }
- bool check_update_type(Item_result type)
- {
- return ((type != STRING_RESULT) && (type != INT_RESULT));
- }
- bool check_default(enum_var_type type) { return 0; }
- bool update(THD *thd, set_var *var);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- virtual void set_default(THD *thd, enum_var_type type)= 0;
- virtual CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type)= 0;
- };
- class sys_var_character_set_client :public sys_var_character_set
- {
- public:
- sys_var_character_set_client(const char *name_arg) :
- sys_var_character_set(name_arg) {}
- void set_default(THD *thd, enum_var_type type);
- CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
- };
- class sys_var_character_set_results :public sys_var_character_set
- {
- public:
- sys_var_character_set_results(const char *name_arg) :
- sys_var_character_set(name_arg)
- { nullable= 1; }
- void set_default(THD *thd, enum_var_type type);
- CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
- };
- class sys_var_character_set_server :public sys_var_character_set
- {
- public:
- sys_var_character_set_server(const char *name_arg) :
- sys_var_character_set(name_arg) {}
- #if defined(HAVE_REPLICATION) && (MYSQL_VERSION_ID < 50000)
- bool check(THD *thd, set_var *var);
- #endif
- void set_default(THD *thd, enum_var_type type);
- CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
- };
- class sys_var_character_set_database :public sys_var_character_set
- {
- public:
- sys_var_character_set_database(const char *name_arg) :
- sys_var_character_set(name_arg) {}
- void set_default(THD *thd, enum_var_type type);
- CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
- };
- class sys_var_character_set_connection :public sys_var_character_set
- {
- public:
- sys_var_character_set_connection(const char *name_arg) :
- sys_var_character_set(name_arg) {}
- void set_default(THD *thd, enum_var_type type);
- CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
- };
- class sys_var_collation_connection :public sys_var_collation
- {
- public:
- sys_var_collation_connection(const char *name_arg) :sys_var_collation(name_arg) {}
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_collation_server :public sys_var_collation
- {
- public:
- sys_var_collation_server(const char *name_arg) :sys_var_collation(name_arg) {}
- #if defined(HAVE_REPLICATION) && (MYSQL_VERSION_ID < 50000)
- bool check(THD *thd, set_var *var);
- #endif
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_collation_database :public sys_var_collation
- {
- public:
- sys_var_collation_database(const char *name_arg) :sys_var_collation(name_arg) {}
- bool update(THD *thd, set_var *var);
- void set_default(THD *thd, enum_var_type type);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- };
- class sys_var_key_cache_param :public sys_var
- {
- protected:
- size_t offset;
- public:
- sys_var_key_cache_param(const char *name_arg, size_t offset_arg)
- :sys_var(name_arg), offset(offset_arg)
- {}
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- bool check_default(enum_var_type type) { return 1; }
- bool is_struct() { return 1; }
- };
- class sys_var_key_buffer_size :public sys_var_key_cache_param
- {
- public:
- sys_var_key_buffer_size(const char *name_arg)
- :sys_var_key_cache_param(name_arg, offsetof(KEY_CACHE, param_buff_size))
- {}
- bool update(THD *thd, set_var *var);
- SHOW_TYPE type() { return SHOW_LONGLONG; }
- };
- class sys_var_key_cache_long :public sys_var_key_cache_param
- {
- public:
- sys_var_key_cache_long(const char *name_arg, size_t offset_arg)
- :sys_var_key_cache_param(name_arg, offset_arg)
- {}
- bool update(THD *thd, set_var *var);
- SHOW_TYPE type() { return SHOW_LONG; }
- };
- class sys_var_thd_date_time_format :public sys_var_thd
- {
- DATE_TIME_FORMAT *SV::*offset;
- timestamp_type date_time_type;
- public:
- sys_var_thd_date_time_format(const char *name_arg,
- DATE_TIME_FORMAT *SV::*offset_arg,
- timestamp_type date_time_type_arg)
- :sys_var_thd(name_arg), offset(offset_arg),
- date_time_type(date_time_type_arg)
- {}
- SHOW_TYPE type() { return SHOW_CHAR; }
- bool check_update_type(Item_result type)
- {
- return type != STRING_RESULT; /* Only accept strings */
- }
- bool check_default(enum_var_type type) { return 0; }
- bool check(THD *thd, set_var *var);
- bool update(THD *thd, set_var *var);
- void update2(THD *thd, enum_var_type type, DATE_TIME_FORMAT *new_value);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- void set_default(THD *thd, enum_var_type type);
- };
- /* Variable that you can only read from */
- class sys_var_readonly: public sys_var
- {
- public:
- enum_var_type var_type;
- SHOW_TYPE show_type;
- sys_value_ptr_func value_ptr_func;
- sys_var_readonly(const char *name_arg, enum_var_type type,
- SHOW_TYPE show_type_arg,
- sys_value_ptr_func value_ptr_func_arg)
- :sys_var(name_arg), var_type(type),
- show_type(show_type_arg), value_ptr_func(value_ptr_func_arg)
- {}
- bool update(THD *thd, set_var *var) { return 1; }
- bool check_default(enum_var_type type) { return 1; }
- bool check_type(enum_var_type type) { return type != var_type; }
- bool check_update_type(Item_result type) { return 1; }
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
- {
- return (*value_ptr_func)(thd);
- }
- SHOW_TYPE type() { return show_type; }
- };
- class sys_var_thd_time_zone :public sys_var_thd
- {
- public:
- sys_var_thd_time_zone(const char *name_arg):
- sys_var_thd(name_arg)
- {
- #if MYSQL_VERSION_ID < 50000
- no_support_one_shot= 0;
- #endif
- }
- bool check(THD *thd, set_var *var);
- SHOW_TYPE type() { return SHOW_CHAR; }
- bool check_update_type(Item_result type)
- {
- return type != STRING_RESULT; /* Only accept strings */
- }
- bool check_default(enum_var_type type) { return 0; }
- bool update(THD *thd, set_var *var);
- byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
- virtual void set_default(THD *thd, enum_var_type type);
- };
- /****************************************************************************
- Classes for parsing of the SET command
- ****************************************************************************/
- class set_var_base :public Sql_alloc
- {
- public:
- set_var_base() {}
- virtual ~set_var_base() {}
- virtual int check(THD *thd)=0; /* To check privileges etc. */
- virtual int update(THD *thd)=0; /* To set the value */
- /* light check for PS */
- virtual int light_check(THD *thd) { return check(thd); }
- #if MYSQL_VERSION_ID < 50000
- virtual bool no_support_one_shot() { return 1; }
- #endif
- };
- /* MySQL internal variables, like query_cache_size */
- class set_var :public set_var_base
- {
- public:
- sys_var *var;
- Item *value;
- enum_var_type type;
- union
- {
- CHARSET_INFO *charset;
- ulong ulong_value;
- ulonglong ulonglong_value;
- DATE_TIME_FORMAT *date_time_format;
- Time_zone *time_zone;
- } save_result;
- LEX_STRING base; /* for structs */
- set_var(enum_var_type type_arg, sys_var *var_arg, LEX_STRING *base_name_arg,
- Item *value_arg)
- :var(var_arg), type(type_arg), base(*base_name_arg)
- {
- /*
- If the set value is a field, change it to a string to allow things like
- SET table_type=MYISAM;
- */
- if (value_arg && value_arg->type() == Item::FIELD_ITEM)
- {
- Item_field *item= (Item_field*) value_arg;
- if (!(value=new Item_string(item->field_name, strlen(item->field_name),
- item->collation.collation)))
- value=value_arg; /* Give error message later */
- }
- else
- value=value_arg;
- }
- int check(THD *thd);
- int update(THD *thd);
- int light_check(THD *thd);
- #if MYSQL_VERSION_ID < 50000
- bool no_support_one_shot() { return var->no_support_one_shot; }
- #endif
- };
- /* User variables like @my_own_variable */
- class set_var_user: public set_var_base
- {
- Item_func_set_user_var *user_var_item;
- public:
- set_var_user(Item_func_set_user_var *item)
- :user_var_item(item)
- {}
- int check(THD *thd);
- int update(THD *thd);
- int light_check(THD *thd);
- };
- /* For SET PASSWORD */
- class set_var_password: public set_var_base
- {
- LEX_USER *user;
- char *password;
- public:
- set_var_password(LEX_USER *user_arg,char *password_arg)
- :user(user_arg), password(password_arg)
- {}
- int check(THD *thd);
- int update(THD *thd);
- };
- /* For SET NAMES and SET CHARACTER SET */
- class set_var_collation_client: public set_var_base
- {
- CHARSET_INFO *character_set_client;
- CHARSET_INFO *character_set_results;
- CHARSET_INFO *collation_connection;
- public:
- set_var_collation_client(CHARSET_INFO *client_coll_arg,
- CHARSET_INFO *connection_coll_arg,
- CHARSET_INFO *result_coll_arg)
- :character_set_client(client_coll_arg),
- character_set_results(result_coll_arg),
- collation_connection(connection_coll_arg)
- {}
- int check(THD *thd);
- int update(THD *thd);
- };
- /* Named lists (used for keycaches) */
- class NAMED_LIST :public ilink
- {
- const char *name;
- uint name_length;
- public:
- gptr data;
- NAMED_LIST(I_List<NAMED_LIST> *links, const char *name_arg,
- uint name_length_arg, gptr data_arg)
- :name_length(name_length_arg), data(data_arg)
- {
- name= my_strdup_with_length((byte*) name_arg, name_length, MYF(MY_WME));
- links->push_back(this);
- }
- inline bool cmp(const char *name_cmp, uint length)
- {
- return length == name_length && !memcmp(name, name_cmp, length);
- }
- ~NAMED_LIST()
- {
- my_free((char*) name, MYF(0));
- }
- friend bool process_key_caches(int (* func) (const char *name,
- KEY_CACHE *));
- friend void delete_elements(I_List<NAMED_LIST> *list,
- void (*free_element)(const char*, gptr));
- };
- /* updated in sql_acl.cc */
- extern sys_var_thd_bool sys_old_passwords;
- extern LEX_STRING default_key_cache_base;
- /* For sql_yacc */
- struct sys_var_with_base
- {
- sys_var *var;
- LEX_STRING base_name;
- };
- /*
- Prototypes for helper functions
- */
- void set_var_init();
- void set_var_free();
- sys_var *find_sys_var(const char *str, uint length=0);
- int sql_set_variables(THD *thd, List<set_var_base> *var_list);
- bool not_all_support_one_shot(List<set_var_base> *var_list);
- void fix_delay_key_write(THD *thd, enum_var_type type);
- ulong fix_sql_mode(ulong sql_mode);
- extern sys_var_str sys_charset_system;
- extern sys_var_str sys_init_connect;
- extern sys_var_str sys_init_slave;
- extern sys_var_thd_time_zone sys_time_zone;
- CHARSET_INFO *get_old_charset_by_name(const char *old_name);
- gptr find_named(I_List<NAMED_LIST> *list, const char *name, uint length,
- NAMED_LIST **found);
- /* key_cache functions */
- KEY_CACHE *get_key_cache(LEX_STRING *cache_name);
- KEY_CACHE *get_or_create_key_cache(const char *name, uint length);
- void free_key_cache(const char *name, KEY_CACHE *key_cache);
- bool process_key_caches(int (* func) (const char *name, KEY_CACHE *));
- void delete_elements(I_List<NAMED_LIST> *list,
- void (*free_element)(const char*, gptr));