/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=2:tabstop=2:smarttab: * * Copyright (C) 2008 Sun Microsystems * * 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 */ #ifndef DRIZZLED_SET_VAR_H #define DRIZZLED_SET_VAR_H #include #include "drizzled/function/func.h" #include "drizzled/function/set_user_var.h" #include "drizzled/item/string.h" #include "drizzled/item/field.h" /* Classes to support the SET command */ /**************************************************************************** Variables that are changable runtime are declared using the following classes ****************************************************************************/ class sys_var; class set_var; class sys_var_pluginvar; /* opaque */ class Time_zone; typedef struct system_variables SV; typedef struct my_locale_st MY_LOCALE; extern TYPELIB bool_typelib; extern TYPELIB optimizer_switch_typelib; typedef int (*sys_check_func)(Session *, set_var *); typedef bool (*sys_update_func)(Session *, set_var *); typedef void (*sys_after_update_func)(Session *,enum_var_type); typedef void (*sys_set_default_func)(Session *, enum_var_type); typedef unsigned char *(*sys_value_ptr_func)(Session *session); static const std::vector empty_aliases; struct sys_var_chain { sys_var *first; sys_var *last; }; /** * A class which represents a variable, either global or * session-local. */ class sys_var { protected: const std::string name; /**< The name of the variable */ sys_after_update_func after_update; /**< Function pointer triggered after the variable's value is updated */ struct my_option *option_limits; /**< Updated by by set_var_init() */ bool m_allow_empty_value; /**< Does variable allow an empty value? */ sys_var *next; public: sys_var(const std::string name_arg, sys_after_update_func func= NULL) : name(name_arg), after_update(func), m_allow_empty_value(true) {} virtual ~sys_var() {} void chain_sys_var(sys_var_chain *chain_arg) { if (chain_arg->last) chain_arg->last->next= this; else chain_arg->first= this; chain_arg->last= this; } /** * Returns the name of the variable. * * @note * * So that we can exist in a Registry. We really need to formalize that */ inline const std::string &getName() const { return name; } /** * Returns a vector of strings representing aliases * for this variable's name. */ const std::vector& getAliases() const { return empty_aliases; } /** * Returns a pointer to the next sys_var, or NULL if none. */ inline sys_var *getNext() const { return next; } /** * Sets the pointer to the next sys_var. * * @param Pointer to the next sys_var, or NULL if you set the tail... */ inline void setNext(sys_var *in_next) { next= in_next; } /** * Returns a pointer to the variable's option limits */ inline struct my_option *getOptionLimits() const { return option_limits; } /** * Sets the pointer to the variable's option limits * * @param Pointer to the option limits my_option variable */ inline void setOptionLimits(struct my_option *in_option_limits) { option_limits= in_option_limits; } /** * Returns the function pointer for after update trigger, or NULL if none. */ inline sys_after_update_func getAfterUpdateTrigger() const { return after_update; } virtual bool check(Session *session, set_var *var); bool check_enum(Session *session, set_var *var, const TYPELIB *enum_names); bool check_set(Session *session, set_var *var, TYPELIB *enum_names); virtual bool update(Session *session, set_var *var)=0; virtual void set_default(Session *, enum_var_type) {} virtual SHOW_TYPE show_type() { return SHOW_UNDEF; } virtual unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { 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) { return option_limits == 0; } Item *item(Session *session, enum_var_type type, const LEX_STRING *base); virtual bool is_readonly() const { return 0; } virtual sys_var_pluginvar *cast_pluginvar() { return 0; } }; /** * A base class for all variables that require its access to * be guarded with a mutex. */ class sys_var_global: public sys_var { protected: pthread_mutex_t *guard; public: sys_var_global(const char *name_arg, sys_after_update_func after_update_arg, pthread_mutex_t *guard_arg) : sys_var(name_arg, after_update_arg), guard(guard_arg) {} }; class sys_var_uint32_t_ptr :public sys_var { uint32_t *value; public: sys_var_uint32_t_ptr(sys_var_chain *chain, const char *name_arg, uint32_t *value_ptr_arg) :sys_var(name_arg),value(value_ptr_arg) { chain_sys_var(chain); } sys_var_uint32_t_ptr(sys_var_chain *chain, const char *name_arg, uint32_t *value_ptr_arg, sys_after_update_func func) :sys_var(name_arg,func), value(value_ptr_arg) { chain_sys_var(chain); } bool check(Session *session, set_var *var); bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_INT; } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) value; } }; class sys_var_uint64_t_ptr :public sys_var { uint64_t *value; public: sys_var_uint64_t_ptr(sys_var_chain *chain, const char *name_arg, uint64_t *value_ptr_arg) :sys_var(name_arg),value(value_ptr_arg) { chain_sys_var(chain); } sys_var_uint64_t_ptr(sys_var_chain *chain, const char *name_arg, uint64_t *value_ptr_arg, sys_after_update_func func) :sys_var(name_arg,func), value(value_ptr_arg) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_LONGLONG; } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) value; } }; class sys_var_size_t_ptr :public sys_var { size_t *value; public: sys_var_size_t_ptr(sys_var_chain *chain, const char *name_arg, size_t *value_ptr_arg) :sys_var(name_arg),value(value_ptr_arg) { chain_sys_var(chain); } sys_var_size_t_ptr(sys_var_chain *chain, const char *name_arg, size_t *value_ptr_arg, sys_after_update_func func) :sys_var(name_arg,func), value(value_ptr_arg) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_SIZE; } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) value; } }; class sys_var_bool_ptr :public sys_var { public: bool *value; sys_var_bool_ptr(sys_var_chain *chain, const char *name_arg, bool *value_arg) :sys_var(name_arg),value(value_arg) { chain_sys_var(chain); } bool check(Session *session, set_var *var) { return check_enum(session, var, &bool_typelib); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_MY_BOOL; } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) value; } bool check_update_type(Item_result) { return 0; } }; class sys_var_bool_ptr_readonly :public sys_var_bool_ptr { public: sys_var_bool_ptr_readonly(sys_var_chain *chain, const char *name_arg, bool *value_arg) :sys_var_bool_ptr(chain, name_arg, value_arg) {} bool is_readonly() const { return 1; } }; class sys_var_str :public sys_var { public: char *value; // Pointer to allocated string uint32_t value_length; sys_check_func check_func; sys_update_func update_func; sys_set_default_func set_default_func; sys_var_str(sys_var_chain *chain, 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) { chain_sys_var(chain); } bool check(Session *session, set_var *var); bool update(Session *session, set_var *var) { return (*update_func)(session, var); } void set_default(Session *session, enum_var_type type) { (*set_default_func)(session, type); } SHOW_TYPE show_type() { return SHOW_CHAR; } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) value; } bool check_update_type(Item_result type) { return type != STRING_RESULT; /* Only accept strings */ } bool check_default(enum_var_type) { return 0; } }; class sys_var_const_str :public sys_var { char *value; // Pointer to const value public: sys_var_const_str(sys_var_chain *chain, const char *name_arg, const char *value_arg) :sys_var(name_arg), value((char*) value_arg) { chain_sys_var(chain); } inline void set (char *new_value) { value= new_value; } bool check(Session *, set_var *) { return 1; } bool update(Session *, set_var *) { return 1; } SHOW_TYPE show_type() { return SHOW_CHAR; } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) value; } bool check_update_type(Item_result) { return 1; } bool check_default(enum_var_type) { return 1; } bool is_readonly() const { return 1; } }; class sys_var_const_str_ptr :public sys_var { char **value; // Pointer to const value public: sys_var_const_str_ptr(sys_var_chain *chain, const char *name_arg, char **value_arg) :sys_var(name_arg),value(value_arg) { chain_sys_var(chain); } bool check(Session *, set_var *) { return 1; } bool update(Session *, set_var *) { return 1; } SHOW_TYPE show_type() { return SHOW_CHAR; } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) *value; } bool check_update_type(Item_result) { return 1; } bool check_default(enum_var_type) { return 1; } bool is_readonly(void) const { return 1; } }; class sys_var_enum :public sys_var { uint32_t *value; TYPELIB *enum_names; public: sys_var_enum(sys_var_chain *chain, const char *name_arg, uint32_t *value_arg, TYPELIB *typelib, sys_after_update_func func) :sys_var(name_arg,func), value(value_arg), enum_names(typelib) { chain_sys_var(chain); } bool check(Session *session, set_var *var) { return check_enum(session, var, enum_names); } bool update(Session *session, set_var *var); SHOW_TYPE show_type() { return SHOW_CHAR; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); bool check_update_type(Item_result) { return 0; } }; class sys_var_enum_const :public sys_var { uint32_t SV::*offset; TYPELIB *enum_names; public: sys_var_enum_const(sys_var_chain *chain, const char *name_arg, uint32_t SV::*offset_arg, TYPELIB *typelib, sys_after_update_func func) :sys_var(name_arg,func), offset(offset_arg), enum_names(typelib) { chain_sys_var(chain); } bool check(Session *, set_var *) { return 1; } bool update(Session *, set_var *) { return 1; } SHOW_TYPE show_type() { return SHOW_CHAR; } bool check_update_type(Item_result) { return 1; } bool is_readonly() const { return 1; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; class sys_var_session :public sys_var { public: sys_var_session(const char *name_arg, sys_after_update_func func= NULL) :sys_var(name_arg, func) {} bool check_type(enum_var_type) { return 0; } bool check_default(enum_var_type type) { return type == OPT_GLOBAL && !option_limits; } }; class sys_var_session_uint32_t :public sys_var_session { sys_check_func check_func; public: uint32_t SV::*offset; sys_var_session_uint32_t(sys_var_chain *chain, const char *name_arg, uint32_t SV::*offset_arg, sys_check_func c_func= NULL, sys_after_update_func au_func= NULL) :sys_var_session(name_arg, au_func), check_func(c_func), offset(offset_arg) { chain_sys_var(chain); } bool check(Session *session, set_var *var); bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_INT; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; class sys_var_session_ha_rows :public sys_var_session { public: ha_rows SV::*offset; sys_var_session_ha_rows(sys_var_chain *chain, const char *name_arg, ha_rows SV::*offset_arg) :sys_var_session(name_arg), offset(offset_arg) { chain_sys_var(chain); } sys_var_session_ha_rows(sys_var_chain *chain, const char *name_arg, ha_rows SV::*offset_arg, sys_after_update_func func) :sys_var_session(name_arg,func), offset(offset_arg) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_HA_ROWS; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; class sys_var_session_uint64_t :public sys_var_session { sys_check_func check_func; public: uint64_t SV::*offset; bool only_global; sys_var_session_uint64_t(sys_var_chain *chain, const char *name_arg, uint64_t SV::*offset_arg, sys_after_update_func au_func= NULL, sys_check_func c_func= NULL) :sys_var_session(name_arg, au_func), check_func(c_func), offset(offset_arg) { chain_sys_var(chain); } sys_var_session_uint64_t(sys_var_chain *chain, const char *name_arg, uint64_t SV::*offset_arg, sys_after_update_func func, bool only_global_arg, sys_check_func cfunc= NULL) :sys_var_session(name_arg, func), check_func(cfunc), offset(offset_arg), only_global(only_global_arg) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_LONGLONG; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); bool check(Session *session, set_var *var); 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_session_size_t :public sys_var_session { sys_check_func check_func; public: size_t SV::*offset; bool only_global; sys_var_session_size_t(sys_var_chain *chain, const char *name_arg, size_t SV::*offset_arg, sys_after_update_func au_func= NULL, sys_check_func c_func= NULL) :sys_var_session(name_arg, au_func), check_func(c_func), offset(offset_arg) { chain_sys_var(chain); } sys_var_session_size_t(sys_var_chain *chain, const char *name_arg, size_t SV::*offset_arg, sys_after_update_func func, bool only_global_arg, sys_check_func cfunc= NULL) :sys_var_session(name_arg, func), check_func(cfunc), offset(offset_arg), only_global(only_global_arg) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_SIZE; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); bool check(Session *session, set_var *var); 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_session_bool :public sys_var_session { public: bool SV::*offset; sys_var_session_bool(sys_var_chain *chain, const char *name_arg, bool SV::*offset_arg) :sys_var_session(name_arg), offset(offset_arg) { chain_sys_var(chain); } sys_var_session_bool(sys_var_chain *chain, const char *name_arg, bool SV::*offset_arg, sys_after_update_func func) :sys_var_session(name_arg,func), offset(offset_arg) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_MY_BOOL; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); bool check(Session *session, set_var *var) { return check_enum(session, var, &bool_typelib); } bool check_update_type(Item_result) { return 0; } }; class sys_var_session_enum :public sys_var_session { protected: uint32_t SV::*offset; TYPELIB *enum_names; sys_check_func check_func; public: sys_var_session_enum(sys_var_chain *chain, const char *name_arg, uint32_t SV::*offset_arg, TYPELIB *typelib, sys_after_update_func func= NULL, sys_check_func check_f= NULL) :sys_var_session(name_arg, func), offset(offset_arg), enum_names(typelib), check_func(check_f) { chain_sys_var(chain); } bool check(Session *session, set_var *var) { int ret= 0; if (check_func) ret= (*check_func)(session, var); return ret ? ret : check_enum(session, var, enum_names); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_CHAR; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); bool check_update_type(Item_result) { return 0; } }; class sys_var_session_optimizer_switch :public sys_var_session_enum { public: sys_var_session_optimizer_switch(sys_var_chain *chain, const char *name_arg, uint32_t SV::*offset_arg) :sys_var_session_enum(chain, name_arg, offset_arg, &optimizer_switch_typelib) {} bool check(Session *session, set_var *var) { return check_set(session, var, enum_names); } void set_default(Session *session, enum_var_type type); unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); static bool symbolic_mode_representation(Session *session, uint32_t sql_mode, LEX_STRING *rep); }; class sys_var_session_storage_engine :public sys_var_session { protected: drizzled::plugin::StorageEngine *SV::*offset; public: sys_var_session_storage_engine(sys_var_chain *chain, const char *name_arg, drizzled::plugin::StorageEngine *SV::*offset_arg) :sys_var_session(name_arg), offset(offset_arg) { chain_sys_var(chain); } bool check(Session *session, set_var *var); SHOW_TYPE show_type() { return SHOW_CHAR; } bool check_update_type(Item_result type) { return type != STRING_RESULT; /* Only accept strings */ } void set_default(Session *session, enum_var_type type); bool update(Session *session, set_var *var); unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; class sys_var_session_bit :public sys_var_session { sys_check_func check_func; sys_update_func update_func; public: uint64_t bit_flag; bool reverse; sys_var_session_bit(sys_var_chain *chain, const char *name_arg, sys_check_func c_func, sys_update_func u_func, uint64_t bit, bool reverse_arg=0) :sys_var_session(name_arg, NULL), check_func(c_func), update_func(u_func), bit_flag(bit), reverse(reverse_arg) { chain_sys_var(chain); } bool check(Session *session, set_var *var); bool update(Session *session, set_var *var); bool check_update_type(Item_result) { return 0; } bool check_type(enum_var_type type) { return type == OPT_GLOBAL; } SHOW_TYPE show_type() { return SHOW_MY_BOOL; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; /* some variables that require special handling */ class sys_var_timestamp :public sys_var { public: sys_var_timestamp(sys_var_chain *chain, const char *name_arg) :sys_var(name_arg, NULL) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); bool check_type(enum_var_type type) { return type == OPT_GLOBAL; } bool check_default(enum_var_type) { return 0; } SHOW_TYPE show_type(void) { return SHOW_LONG; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; class sys_var_last_insert_id :public sys_var { public: sys_var_last_insert_id(sys_var_chain *chain, const char *name_arg) :sys_var(name_arg, NULL) { chain_sys_var(chain); } bool update(Session *session, set_var *var); bool check_type(enum_var_type type) { return type == OPT_GLOBAL; } SHOW_TYPE show_type() { return SHOW_LONGLONG; } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; class sys_var_collation :public sys_var_session { public: sys_var_collation(const char *name_arg) :sys_var_session(name_arg, NULL) { } bool check(Session *session, set_var *var); SHOW_TYPE show_type() { return SHOW_CHAR; } bool check_update_type(Item_result type) { return ((type != STRING_RESULT) && (type != INT_RESULT)); } bool check_default(enum_var_type) { return 0; } virtual void set_default(Session *session, enum_var_type type)= 0; }; class sys_var_collation_sv :public sys_var_collation { const CHARSET_INFO *SV::*offset; const CHARSET_INFO **global_default; public: sys_var_collation_sv(sys_var_chain *chain, const char *name_arg, const CHARSET_INFO *SV::*offset_arg, const CHARSET_INFO **global_default_arg) :sys_var_collation(name_arg), offset(offset_arg), global_default(global_default_arg) { chain_sys_var(chain); } bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); }; class sys_var_key_cache_param :public sys_var { protected: size_t offset; public: sys_var_key_cache_param(sys_var_chain *chain, const char *name_arg, size_t offset_arg) :sys_var(name_arg), offset(offset_arg) { chain_sys_var(chain); } unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); bool check_default(enum_var_type) { return 1; } }; class sys_var_key_buffer_size :public sys_var_key_cache_param { public: sys_var_key_buffer_size(sys_var_chain *chain, const char *name_arg) :sys_var_key_cache_param(chain, name_arg, offsetof(KEY_CACHE, param_buff_size)) {} bool update(Session *session, set_var *var); SHOW_TYPE show_type() { return SHOW_LONGLONG; } }; class sys_var_key_cache_uint32_t :public sys_var_key_cache_param { public: sys_var_key_cache_uint32_t(sys_var_chain *chain, const char *name_arg, size_t offset_arg) :sys_var_key_cache_param(chain, name_arg, offset_arg) {} bool update(Session *session, set_var *var); SHOW_TYPE show_type() { return SHOW_INT; } }; /* Variable that you can only read from */ class sys_var_readonly: public sys_var { public: enum_var_type var_type; SHOW_TYPE show_type_value; sys_value_ptr_func value_ptr_func; sys_var_readonly(sys_var_chain *chain, 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_value(show_type_arg), value_ptr_func(value_ptr_func_arg) { chain_sys_var(chain); } bool update(Session *, set_var *) { return 1; } bool check_default(enum_var_type) { return 1; } bool check_type(enum_var_type type) { return type != var_type; } bool check_update_type(Item_result) { return 1; } unsigned char *value_ptr(Session *session, enum_var_type, const LEX_STRING *) { return (*value_ptr_func)(session); } SHOW_TYPE show_type(void) { return show_type_value; } bool is_readonly(void) const { return 1; } }; class sys_var_have_option: public sys_var { protected: virtual SHOW_COMP_OPTION get_option() = 0; public: sys_var_have_option(sys_var_chain *chain, const char *variable_name): sys_var(variable_name) { chain_sys_var(chain); } unsigned char *value_ptr(Session *, enum_var_type, const LEX_STRING *) { return (unsigned char*) show_comp_option_name[get_option()]; } bool update(Session *, set_var *) { return 1; } bool check_default(enum_var_type) { return 1; } bool check_type(enum_var_type type) { return type != OPT_GLOBAL; } bool check_update_type(Item_result) { return 1; } SHOW_TYPE show_type() { return SHOW_CHAR; } bool is_readonly() const { return 1; } }; class sys_var_have_variable: public sys_var_have_option { SHOW_COMP_OPTION *have_variable; public: sys_var_have_variable(sys_var_chain *chain, const char *variable_name, SHOW_COMP_OPTION *have_variable_arg): sys_var_have_option(chain, variable_name), have_variable(have_variable_arg) { } SHOW_COMP_OPTION get_option() { return *have_variable; } }; class sys_var_have_plugin: public sys_var_have_option { const char *plugin_name_str; const uint32_t plugin_name_len; const int plugin_type; public: sys_var_have_plugin(sys_var_chain *chain, const char *variable_name, const char *plugin_name_str_arg, uint32_t plugin_name_len_arg, int plugin_type_arg): sys_var_have_option(chain, variable_name), plugin_name_str(plugin_name_str_arg), plugin_name_len(plugin_name_len_arg), plugin_type(plugin_type_arg) { } /* the following method is declared in sql_plugin.cc */ SHOW_COMP_OPTION get_option(); }; class sys_var_session_time_zone :public sys_var_session { public: sys_var_session_time_zone(sys_var_chain *chain, const char *name_arg) :sys_var_session(name_arg, NULL) { chain_sys_var(chain); } bool check(Session *session, set_var *var); SHOW_TYPE show_type() { return SHOW_CHAR; } bool check_update_type(Item_result type) { return type != STRING_RESULT; /* Only accept strings */ } bool check_default(enum_var_type) { return 0; } bool update(Session *session, set_var *var); unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); virtual void set_default(Session *session, enum_var_type type); }; class sys_var_microseconds :public sys_var_session { uint64_t SV::*offset; public: sys_var_microseconds(sys_var_chain *chain, const char *name_arg, uint64_t SV::*offset_arg): sys_var_session(name_arg), offset(offset_arg) { chain_sys_var(chain); } bool check(Session *, set_var *) {return 0;} bool update(Session *session, set_var *var); void set_default(Session *session, enum_var_type type); SHOW_TYPE show_type() { return SHOW_DOUBLE; } bool check_update_type(Item_result type) { return (type != INT_RESULT && type != REAL_RESULT && type != DECIMAL_RESULT); } }; class sys_var_session_lc_time_names :public sys_var_session { public: sys_var_session_lc_time_names(sys_var_chain *chain, const char *name_arg) : sys_var_session(name_arg, NULL) { chain_sys_var(chain); } bool check(Session *session, set_var *var); SHOW_TYPE show_type() { return SHOW_CHAR; } bool check_update_type(Item_result type) { return ((type != STRING_RESULT) && (type != INT_RESULT)); } bool check_default(enum_var_type) { return 0; } bool update(Session *session, set_var *var); unsigned char *value_ptr(Session *session, enum_var_type type, const LEX_STRING *base); virtual void set_default(Session *session, 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(Session *session)=0; /* To check privileges etc. */ virtual int update(Session *session)=0; /* To set the value */ /* light check for PS */ }; /* MySQL internal variables */ class set_var :public set_var_base { public: sys_var *var; Item *value; enum_var_type type; union { const CHARSET_INFO *charset; uint32_t uint32_t_value; uint64_t uint64_t_value; size_t size_t_value; drizzled::plugin::StorageEngine *storage_engine; Time_zone *time_zone; MY_LOCALE *locale_value; } save_result; LEX_STRING base; /* for structs */ set_var(enum_var_type type_arg, sys_var *var_arg, const 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, (uint32_t) strlen(item->field_name), item->collation.collation))) value=value_arg; /* Give error message later */ } else value=value_arg; } int check(Session *session); int update(Session *session); }; /* 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(Session *session); int update(Session *session); }; /* For sql_yacc */ struct sys_var_with_base { sys_var *var; LEX_STRING base_name; }; /* Prototypes for helper functions */ int set_var_init(); void set_var_free(); int mysql_append_static_vars(const SHOW_VAR *show_vars, uint32_t count); SHOW_VAR* enumerate_sys_vars(Session *session, bool sorted); void drizzle_add_plugin_sysvar(sys_var_pluginvar *var); void drizzle_del_plugin_sysvar(); int mysql_add_sys_var_chain(sys_var *chain, struct my_option *long_options); int mysql_del_sys_var_chain(sys_var *chain); sys_var *find_sys_var(Session *session, const char *str, uint32_t length=0); int sql_set_variables(Session *session, List *var_list); bool not_all_support_one_shot(List *var_list); extern sys_var_session_time_zone sys_time_zone; extern sys_var_session_bit sys_autocommit; const CHARSET_INFO *get_old_charset_by_name(const char *old_name); extern sys_var_str sys_var_general_log_path, sys_var_slow_log_path; #endif /* DRIZZLED_SET_VAR_H */