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/* Copyright (C) 2002-2006 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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/* Classes to support the SET command */
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class implementation */
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/****************************************************************************
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Variables that are changable runtime are declared using the
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****************************************************************************/
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class sys_var_pluginvar; /* opaque */
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typedef struct system_variables SV;
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typedef struct my_locale_st MY_LOCALE;
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extern TYPELIB bool_typelib, delay_key_write_typelib, sql_mode_typelib,
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optimizer_switch_typelib, slave_exec_mode_typelib;
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typedef int (*sys_check_func)(THD *, set_var *);
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typedef bool (*sys_update_func)(THD *, set_var *);
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typedef void (*sys_after_update_func)(THD *,enum_var_type);
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typedef void (*sys_set_default_func)(THD *, enum_var_type);
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typedef uchar *(*sys_value_ptr_func)(THD *thd);
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Enumeration type to indicate for a system variable whether it will be written to the binlog or not.
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enum Binlog_status_enum
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/* The variable value is not in the binlog. */
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/* The value of the @@session variable is in the binlog. */
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SESSION_VARIABLE_IN_BINLOG
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Currently, no @@global variable is ever in the binlog, so we
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don't need an enumeration value for that.
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struct my_option *option_limits; /* Updated by by set_var_init() */
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uint name_length; /* Updated by by set_var_init() */
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sys_after_update_func after_update;
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bool no_support_one_shot;
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true if the value is in character_set_filesystem,
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Note that we can't use a pointer to the charset as the system var is
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instantiated in global scope and the charset pointers are initialized
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sys_var(const char *name_arg, sys_after_update_func func= NULL,
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Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
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:name(name_arg), after_update(func), no_support_one_shot(1),
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is_os_charset (FALSE),
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binlog_status(binlog_status_arg),
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m_allow_empty_value(TRUE)
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void chain_sys_var(sys_var_chain *chain_arg)
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chain_arg->last->next= this;
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chain_arg->first= this;
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chain_arg->last= this;
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virtual bool check(THD *thd, set_var *var);
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bool check_enum(THD *thd, set_var *var, const TYPELIB *enum_names);
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bool check_set(THD *thd, set_var *var, TYPELIB *enum_names);
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bool is_written_to_binlog(enum_var_type type)
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return (type == OPT_SESSION || type == OPT_DEFAULT) &&
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(binlog_status == SESSION_VARIABLE_IN_BINLOG);
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virtual bool update(THD *thd, set_var *var)=0;
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virtual void set_default(THD *thd_arg, enum_var_type type) {}
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virtual SHOW_TYPE show_type() { return SHOW_UNDEF; }
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virtual uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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virtual bool check_type(enum_var_type type)
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{ return type != OPT_GLOBAL; } /* Error if not GLOBAL */
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virtual bool check_update_type(Item_result type)
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{ return type != INT_RESULT; } /* Assume INT */
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virtual bool check_default(enum_var_type type)
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{ return option_limits == 0; }
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virtual bool is_struct() { return 0; }
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virtual bool is_readonly() const { return 0; }
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CHARSET_INFO *charset(THD *thd);
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virtual sys_var_pluginvar *cast_pluginvar() { return 0; }
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void set_allow_empty_value(bool allow_empty_value)
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m_allow_empty_value= allow_empty_value;
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const Binlog_status_enum binlog_status;
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bool m_allow_empty_value;
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A base class for all variables that require its access to
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be guarded with a mutex.
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class sys_var_global: public sys_var
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pthread_mutex_t *guard;
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sys_var_global(const char *name_arg, sys_after_update_func after_update_arg,
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pthread_mutex_t *guard_arg)
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:sys_var(name_arg, after_update_arg), guard(guard_arg) {}
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A global-only ulong variable that requires its access to be
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protected with a mutex.
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class sys_var_long_ptr_global: public sys_var_global
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sys_var_long_ptr_global(sys_var_chain *chain, const char *name_arg,
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ulong *value_ptr_arg,
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pthread_mutex_t *guard_arg,
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sys_after_update_func after_update_arg= NULL)
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:sys_var_global(name_arg, after_update_arg, guard_arg),
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var);
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_LONG; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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{ return (uchar*) value; }
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A global ulong variable that is protected by LOCK_global_system_variables
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class sys_var_long_ptr :public sys_var_long_ptr_global
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sys_var_long_ptr(sys_var_chain *chain, const char *name_arg, ulong *value_ptr,
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sys_after_update_func after_update_arg= NULL);
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class sys_var_ulonglong_ptr :public sys_var
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sys_var_ulonglong_ptr(sys_var_chain *chain, const char *name_arg, ulonglong *value_ptr_arg)
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:sys_var(name_arg),value(value_ptr_arg)
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{ chain_sys_var(chain); }
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sys_var_ulonglong_ptr(sys_var_chain *chain, const char *name_arg, ulonglong *value_ptr_arg,
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sys_after_update_func func)
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:sys_var(name_arg,func), value(value_ptr_arg)
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{ chain_sys_var(chain); }
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_LONGLONG; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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{ return (uchar*) value; }
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class sys_var_bool_ptr :public sys_var
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sys_var_bool_ptr(sys_var_chain *chain, const char *name_arg, my_bool *value_arg)
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:sys_var(name_arg),value(value_arg)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var)
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return check_enum(thd, var, &bool_typelib);
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_MY_BOOL; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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{ return (uchar*) value; }
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bool check_update_type(Item_result type) { return 0; }
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class sys_var_bool_ptr_readonly :public sys_var_bool_ptr
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sys_var_bool_ptr_readonly(sys_var_chain *chain, const char *name_arg,
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:sys_var_bool_ptr(chain, name_arg, value_arg)
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bool is_readonly() const { return 1; }
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class sys_var_str :public sys_var
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char *value; // Pointer to allocated string
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sys_check_func check_func;
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sys_update_func update_func;
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sys_set_default_func set_default_func;
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sys_var_str(sys_var_chain *chain, const char *name_arg,
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sys_check_func check_func_arg,
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sys_update_func update_func_arg,
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sys_set_default_func set_default_func_arg,
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:sys_var(name_arg), value(value_arg), check_func(check_func_arg),
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update_func(update_func_arg),set_default_func(set_default_func_arg)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var);
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bool update(THD *thd, set_var *var)
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return (*update_func)(thd, var);
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void set_default(THD *thd, enum_var_type type)
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(*set_default_func)(thd, type);
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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{ return (uchar*) value; }
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bool check_update_type(Item_result type)
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return type != STRING_RESULT; /* Only accept strings */
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bool check_default(enum_var_type type) { return 0; }
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class sys_var_const_str :public sys_var
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char *value; // Pointer to const value
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sys_var_const_str(sys_var_chain *chain, const char *name_arg,
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const char *value_arg)
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:sys_var(name_arg), value((char*) value_arg)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var)
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bool update(THD *thd, set_var *var)
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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return (uchar*) value;
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bool check_update_type(Item_result type)
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bool check_default(enum_var_type type) { return 1; }
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bool is_readonly() const { return 1; }
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class sys_var_const_os_str: public sys_var_const_str
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sys_var_const_os_str(sys_var_chain *chain, const char *name_arg,
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const char *value_arg)
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:sys_var_const_str(chain, name_arg, value_arg)
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class sys_var_const_str_ptr :public sys_var
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char **value; // Pointer to const value
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sys_var_const_str_ptr(sys_var_chain *chain, const char *name_arg, char **value_arg)
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:sys_var(name_arg),value(value_arg)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var)
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bool update(THD *thd, set_var *var)
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
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return (uchar*) *value;
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bool check_update_type(Item_result type)
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bool check_default(enum_var_type type) { return 1; }
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bool is_readonly() const { return 1; }
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class sys_var_const_os_str_ptr :public sys_var_const_str_ptr
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sys_var_const_os_str_ptr(sys_var_chain *chain, const char *name_arg,
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:sys_var_const_str_ptr(chain, name_arg, value_arg)
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class sys_var_enum :public sys_var
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sys_var_enum(sys_var_chain *chain, const char *name_arg, uint *value_arg,
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TYPELIB *typelib, sys_after_update_func func)
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:sys_var(name_arg,func), value(value_arg), enum_names(typelib)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var)
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return check_enum(thd, var, enum_names);
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bool update(THD *thd, set_var *var);
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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bool check_update_type(Item_result type) { return 0; }
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class sys_var_enum_const :public sys_var
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sys_var_enum_const(sys_var_chain *chain, const char *name_arg, ulong SV::*offset_arg,
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TYPELIB *typelib, sys_after_update_func func)
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:sys_var(name_arg,func), offset(offset_arg), enum_names(typelib)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var) { return 1; }
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bool update(THD *thd, set_var *var) { return 1; }
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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bool check_update_type(Item_result type) { return 1; }
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bool is_readonly() const { return 1; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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class sys_var_thd :public sys_var
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sys_var_thd(const char *name_arg,
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sys_after_update_func func= NULL,
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Binlog_status_enum binlog_status= NOT_IN_BINLOG)
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:sys_var(name_arg, func, binlog_status)
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bool check_type(enum_var_type type) { return 0; }
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bool check_default(enum_var_type type)
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return type == OPT_GLOBAL && !option_limits;
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class sys_var_thd_ulong :public sys_var_thd
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sys_check_func check_func;
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sys_var_thd_ulong(sys_var_chain *chain, const char *name_arg,
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ulong SV::*offset_arg,
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sys_check_func c_func= NULL,
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sys_after_update_func au_func= NULL,
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Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
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:sys_var_thd(name_arg, au_func, binlog_status_arg), check_func(c_func),
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var);
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_LONG; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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class sys_var_thd_ha_rows :public sys_var_thd
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sys_var_thd_ha_rows(sys_var_chain *chain, const char *name_arg,
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ha_rows SV::*offset_arg)
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:sys_var_thd(name_arg), offset(offset_arg)
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{ chain_sys_var(chain); }
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sys_var_thd_ha_rows(sys_var_chain *chain, const char *name_arg,
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ha_rows SV::*offset_arg,
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sys_after_update_func func)
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:sys_var_thd(name_arg,func), offset(offset_arg)
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{ chain_sys_var(chain); }
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_HA_ROWS; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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class sys_var_thd_ulonglong :public sys_var_thd
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ulonglong SV::*offset;
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sys_var_thd_ulonglong(sys_var_chain *chain, const char *name_arg,
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ulonglong SV::*offset_arg)
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:sys_var_thd(name_arg), offset(offset_arg)
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{ chain_sys_var(chain); }
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sys_var_thd_ulonglong(sys_var_chain *chain, const char *name_arg,
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ulonglong SV::*offset_arg,
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sys_after_update_func func, bool only_global_arg)
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:sys_var_thd(name_arg, func), offset(offset_arg),
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only_global(only_global_arg)
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{ chain_sys_var(chain); }
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_LONGLONG; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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bool check(THD *thd, set_var *var);
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bool check_default(enum_var_type type)
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return type == OPT_GLOBAL && !option_limits;
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bool check_type(enum_var_type type)
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return (only_global && type != OPT_GLOBAL);
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class sys_var_thd_bool :public sys_var_thd
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sys_var_thd_bool(sys_var_chain *chain, const char *name_arg, my_bool SV::*offset_arg)
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:sys_var_thd(name_arg), offset(offset_arg)
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{ chain_sys_var(chain); }
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sys_var_thd_bool(sys_var_chain *chain, const char *name_arg, my_bool SV::*offset_arg,
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sys_after_update_func func)
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:sys_var_thd(name_arg,func), offset(offset_arg)
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{ chain_sys_var(chain); }
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_MY_BOOL; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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bool check(THD *thd, set_var *var)
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return check_enum(thd, var, &bool_typelib);
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bool check_update_type(Item_result type) { return 0; }
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class sys_var_thd_enum :public sys_var_thd
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sys_check_func check_func;
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sys_var_thd_enum(sys_var_chain *chain, const char *name_arg,
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ulong SV::*offset_arg, TYPELIB *typelib,
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sys_after_update_func func= NULL,
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sys_check_func check= NULL)
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:sys_var_thd(name_arg, func), offset(offset_arg),
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enum_names(typelib), check_func(check)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var)
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ret= (*check_func)(thd, var);
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return ret ? ret : check_enum(thd, var, enum_names);
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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bool check_update_type(Item_result type) { return 0; }
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class sys_var_thd_optimizer_switch :public sys_var_thd_enum
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sys_var_thd_optimizer_switch(sys_var_chain *chain, const char *name_arg,
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ulong SV::*offset_arg)
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:sys_var_thd_enum(chain, name_arg, offset_arg, &optimizer_switch_typelib)
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bool check(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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static bool symbolic_mode_representation(THD *thd, ulonglong sql_mode,
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extern void fix_sql_mode_var(THD *thd, enum_var_type type);
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class sys_var_thd_sql_mode :public sys_var_thd_enum
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sys_var_thd_sql_mode(sys_var_chain *chain, const char *name_arg,
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ulong SV::*offset_arg)
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:sys_var_thd_enum(chain, name_arg, offset_arg, &sql_mode_typelib,
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bool check(THD *thd, set_var *var)
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return check_set(thd, var, enum_names);
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void set_default(THD *thd, enum_var_type type);
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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static bool symbolic_mode_representation(THD *thd, ulonglong sql_mode,
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class sys_var_thd_storage_engine :public sys_var_thd
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plugin_ref SV::*offset;
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sys_var_thd_storage_engine(sys_var_chain *chain, const char *name_arg,
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plugin_ref SV::*offset_arg)
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:sys_var_thd(name_arg), offset(offset_arg)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var);
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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bool check_update_type(Item_result type)
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return type != STRING_RESULT; /* Only accept strings */
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void set_default(THD *thd, enum_var_type type);
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bool update(THD *thd, set_var *var);
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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class sys_var_thd_table_type :public sys_var_thd_storage_engine
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sys_var_thd_table_type(sys_var_chain *chain, const char *name_arg,
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plugin_ref SV::*offset_arg)
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:sys_var_thd_storage_engine(chain, name_arg, offset_arg)
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void warn_deprecated(THD *thd);
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void set_default(THD *thd, enum_var_type type);
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bool update(THD *thd, set_var *var);
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class sys_var_thd_bit :public sys_var_thd
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sys_check_func check_func;
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sys_update_func update_func;
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sys_var_thd_bit(sys_var_chain *chain, const char *name_arg,
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sys_check_func c_func, sys_update_func u_func,
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ulonglong bit, bool reverse_arg=0,
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Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
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:sys_var_thd(name_arg, NULL, binlog_status_arg), check_func(c_func),
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update_func(u_func), bit_flag(bit), reverse(reverse_arg)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var);
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bool update(THD *thd, set_var *var);
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bool check_update_type(Item_result type) { return 0; }
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bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
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SHOW_TYPE show_type() { return SHOW_MY_BOOL; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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class sys_var_thd_dbug :public sys_var_thd
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sys_var_thd_dbug(sys_var_chain *chain, const char *name_arg)
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:sys_var_thd(name_arg)
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{ chain_sys_var(chain); }
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bool check_update_type(Item_result type) { return type != STRING_RESULT; }
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bool check(THD *thd, set_var *var);
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type) { DBUG_POP(); }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *b);
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#endif /* DBUG_OFF */
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#if defined(ENABLED_DEBUG_SYNC)
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/* Debug Sync Facility. Implemented in debug_sync.cc. */
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class sys_var_debug_sync :public sys_var_thd
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sys_var_debug_sync(sys_var_chain *chain, const char *name_arg)
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:sys_var_thd(name_arg)
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{ chain_sys_var(chain); }
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bool check(THD *thd, set_var *var);
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bool update(THD *thd, set_var *var);
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SHOW_TYPE show_type() { return SHOW_CHAR; }
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bool check_update_type(Item_result type) { return type != STRING_RESULT; }
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uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
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#endif /* defined(ENABLED_DEBUG_SYNC) */
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/* some variables that require special handling */
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class sys_var_timestamp :public sys_var
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sys_var_timestamp(sys_var_chain *chain, const char *name_arg,
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Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
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:sys_var(name_arg, NULL, binlog_status_arg)
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{ chain_sys_var(chain); }
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bool update(THD *thd, set_var *var);
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void set_default(THD *thd, enum_var_type type);
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bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
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bool check_default(enum_var_type type) { return 0; }
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SHOW_TYPE show_type() { return SHOW_LONG; }
670
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
674
class sys_var_last_insert_id :public sys_var
677
sys_var_last_insert_id(sys_var_chain *chain, const char *name_arg,
678
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
679
:sys_var(name_arg, NULL, binlog_status_arg)
680
{ chain_sys_var(chain); }
681
bool update(THD *thd, set_var *var);
682
bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
683
SHOW_TYPE show_type() { return SHOW_LONGLONG; }
684
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
688
class sys_var_insert_id :public sys_var
691
sys_var_insert_id(sys_var_chain *chain, const char *name_arg)
693
{ chain_sys_var(chain); }
694
bool update(THD *thd, set_var *var);
695
bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
696
SHOW_TYPE show_type() { return SHOW_LONGLONG; }
697
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
701
class sys_var_rand_seed1 :public sys_var
704
sys_var_rand_seed1(sys_var_chain *chain, const char *name_arg,
705
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
706
:sys_var(name_arg, NULL, binlog_status_arg)
707
{ chain_sys_var(chain); }
708
bool update(THD *thd, set_var *var);
709
bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
712
class sys_var_rand_seed2 :public sys_var
715
sys_var_rand_seed2(sys_var_chain *chain, const char *name_arg,
716
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
717
:sys_var(name_arg, NULL, binlog_status_arg)
718
{ chain_sys_var(chain); }
719
bool update(THD *thd, set_var *var);
720
bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
724
class sys_var_collation :public sys_var_thd
727
sys_var_collation(const char *name_arg,
728
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
729
:sys_var_thd(name_arg, NULL, binlog_status_arg)
731
no_support_one_shot= 0;
733
bool check(THD *thd, set_var *var);
734
SHOW_TYPE show_type() { return SHOW_CHAR; }
735
bool check_update_type(Item_result type)
737
return ((type != STRING_RESULT) && (type != INT_RESULT));
739
bool check_default(enum_var_type type) { return 0; }
740
virtual void set_default(THD *thd, enum_var_type type)= 0;
743
class sys_var_character_set :public sys_var_thd
747
sys_var_character_set(const char *name_arg, bool is_nullable= 0,
748
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
749
:sys_var_thd(name_arg, NULL, binlog_status_arg), nullable(is_nullable)
752
In fact only almost all variables derived from sys_var_character_set
753
support ONE_SHOT; character_set_results doesn't. But that's good enough.
755
no_support_one_shot= 0;
757
bool check(THD *thd, set_var *var);
758
SHOW_TYPE show_type() { return SHOW_CHAR; }
759
bool check_update_type(Item_result type)
761
return ((type != STRING_RESULT) && (type != INT_RESULT));
763
bool check_default(enum_var_type type) { return 0; }
764
bool update(THD *thd, set_var *var);
765
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
766
virtual void set_default(THD *thd, enum_var_type type)= 0;
767
virtual CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type)= 0;
770
class sys_var_character_set_sv :public sys_var_character_set
772
CHARSET_INFO *SV::*offset;
773
CHARSET_INFO **global_default;
775
sys_var_character_set_sv(sys_var_chain *chain, const char *name_arg,
776
CHARSET_INFO *SV::*offset_arg,
777
CHARSET_INFO **global_default_arg,
779
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
780
: sys_var_character_set(name_arg, is_nullable, binlog_status_arg),
781
offset(offset_arg), global_default(global_default_arg)
782
{ chain_sys_var(chain); }
783
void set_default(THD *thd, enum_var_type type);
784
CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
788
class sys_var_character_set_client: public sys_var_character_set_sv
791
sys_var_character_set_client(sys_var_chain *chain, const char *name_arg,
792
CHARSET_INFO *SV::*offset_arg,
793
CHARSET_INFO **global_default_arg,
794
Binlog_status_enum binlog_status_arg)
795
: sys_var_character_set_sv(chain, name_arg, offset_arg, global_default_arg,
796
0, binlog_status_arg)
798
bool check(THD *thd, set_var *var);
802
class sys_var_character_set_database :public sys_var_character_set
805
sys_var_character_set_database(sys_var_chain *chain, const char *name_arg,
806
Binlog_status_enum binlog_status_arg=
808
: sys_var_character_set(name_arg, 0, binlog_status_arg)
809
{ chain_sys_var(chain); }
810
void set_default(THD *thd, enum_var_type type);
811
CHARSET_INFO **ci_ptr(THD *thd, enum_var_type type);
814
class sys_var_collation_sv :public sys_var_collation
816
CHARSET_INFO *SV::*offset;
817
CHARSET_INFO **global_default;
819
sys_var_collation_sv(sys_var_chain *chain, const char *name_arg,
820
CHARSET_INFO *SV::*offset_arg,
821
CHARSET_INFO **global_default_arg,
822
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
823
:sys_var_collation(name_arg, binlog_status_arg),
824
offset(offset_arg), global_default(global_default_arg)
826
chain_sys_var(chain);
828
bool update(THD *thd, set_var *var);
829
void set_default(THD *thd, enum_var_type type);
830
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
834
class sys_var_key_cache_param :public sys_var
839
sys_var_key_cache_param(sys_var_chain *chain, const char *name_arg,
841
:sys_var(name_arg), offset(offset_arg)
842
{ chain_sys_var(chain); }
843
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
844
bool check_default(enum_var_type type) { return 1; }
845
bool is_struct() { return 1; }
849
class sys_var_key_buffer_size :public sys_var_key_cache_param
852
sys_var_key_buffer_size(sys_var_chain *chain, const char *name_arg)
853
:sys_var_key_cache_param(chain, name_arg,
854
offsetof(KEY_CACHE, param_buff_size))
856
bool update(THD *thd, set_var *var);
857
SHOW_TYPE show_type() { return SHOW_LONGLONG; }
861
class sys_var_key_cache_long :public sys_var_key_cache_param
864
sys_var_key_cache_long(sys_var_chain *chain, const char *name_arg, size_t offset_arg)
865
:sys_var_key_cache_param(chain, name_arg, offset_arg)
867
bool update(THD *thd, set_var *var);
868
SHOW_TYPE show_type() { return SHOW_LONG; }
872
class sys_var_thd_date_time_format :public sys_var_thd
874
DATE_TIME_FORMAT *SV::*offset;
875
timestamp_type date_time_type;
877
sys_var_thd_date_time_format(sys_var_chain *chain, const char *name_arg,
878
DATE_TIME_FORMAT *SV::*offset_arg,
879
timestamp_type date_time_type_arg)
880
:sys_var_thd(name_arg), offset(offset_arg),
881
date_time_type(date_time_type_arg)
882
{ chain_sys_var(chain); }
883
SHOW_TYPE show_type() { return SHOW_CHAR; }
884
bool check_update_type(Item_result type)
886
return type != STRING_RESULT; /* Only accept strings */
888
bool check_default(enum_var_type type) { return 0; }
889
bool check(THD *thd, set_var *var);
890
bool update(THD *thd, set_var *var);
891
void update2(THD *thd, enum_var_type type, DATE_TIME_FORMAT *new_value);
892
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
893
void set_default(THD *thd, enum_var_type type);
897
class sys_var_log_state :public sys_var_bool_ptr
901
sys_var_log_state(sys_var_chain *chain, const char *name_arg, my_bool *value_arg,
903
:sys_var_bool_ptr(chain, name_arg, value_arg), log_type(log_type_arg) {}
904
bool update(THD *thd, set_var *var);
905
void set_default(THD *thd, enum_var_type type);
909
class sys_var_set :public sys_var
915
sys_var_set(sys_var_chain *chain, const char *name_arg, ulong *value_arg,
916
TYPELIB *typelib, sys_after_update_func func)
917
:sys_var(name_arg, func), value(value_arg), enum_names(typelib)
918
{ chain_sys_var(chain); }
919
virtual bool check(THD *thd, set_var *var)
921
return check_set(thd, var, enum_names);
923
virtual void set_default(THD *thd, enum_var_type type)
927
bool update(THD *thd, set_var *var);
928
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
929
bool check_update_type(Item_result type) { return 0; }
930
SHOW_TYPE show_type() { return SHOW_CHAR; }
933
class sys_var_set_slave_mode :public sys_var_set
936
sys_var_set_slave_mode(sys_var_chain *chain, const char *name_arg,
938
TYPELIB *typelib, sys_after_update_func func) :
939
sys_var_set(chain, name_arg, value_arg, typelib, func) {}
940
void set_default(THD *thd, enum_var_type type);
941
bool check(THD *thd, set_var *var);
942
bool update(THD *thd, set_var *var);
945
class sys_var_log_output :public sys_var
950
sys_var_log_output(sys_var_chain *chain, const char *name_arg, ulong *value_arg,
951
TYPELIB *typelib, sys_after_update_func func)
952
:sys_var(name_arg,func), value(value_arg), enum_names(typelib)
954
chain_sys_var(chain);
955
set_allow_empty_value(FALSE);
957
virtual bool check(THD *thd, set_var *var)
959
return check_set(thd, var, enum_names);
961
bool update(THD *thd, set_var *var);
962
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
963
bool check_update_type(Item_result type) { return 0; }
964
void set_default(THD *thd, enum_var_type type);
965
SHOW_TYPE show_type() { return SHOW_CHAR; }
969
/* Variable that you can only read from */
971
class sys_var_readonly: public sys_var
974
enum_var_type var_type;
975
SHOW_TYPE show_type_value;
976
sys_value_ptr_func value_ptr_func;
977
sys_var_readonly(sys_var_chain *chain, const char *name_arg, enum_var_type type,
978
SHOW_TYPE show_type_arg,
979
sys_value_ptr_func value_ptr_func_arg)
980
:sys_var(name_arg), var_type(type),
981
show_type_value(show_type_arg), value_ptr_func(value_ptr_func_arg)
982
{ chain_sys_var(chain); }
983
bool update(THD *thd, set_var *var) { return 1; }
984
bool check_default(enum_var_type type) { return 1; }
985
bool check_type(enum_var_type type) { return type != var_type; }
986
bool check_update_type(Item_result type) { return 1; }
987
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
989
return (*value_ptr_func)(thd);
991
SHOW_TYPE show_type() { return show_type_value; }
992
bool is_readonly() const { return 1; }
996
class sys_var_readonly_os: public sys_var_readonly
999
sys_var_readonly_os(sys_var_chain *chain, const char *name_arg, enum_var_type type,
1000
SHOW_TYPE show_type_arg,
1001
sys_value_ptr_func value_ptr_func_arg)
1002
:sys_var_readonly(chain, name_arg, type, show_type_arg, value_ptr_func_arg)
1004
is_os_charset= TRUE;
1010
Global-only, read-only variable. E.g. command line option.
1013
class sys_var_const: public sys_var
1016
enum_var_type var_type;
1017
SHOW_TYPE show_type_value;
1019
sys_var_const(sys_var_chain *chain, const char *name_arg, enum_var_type type,
1020
SHOW_TYPE show_type_arg, uchar *ptr_arg)
1021
:sys_var(name_arg), var_type(type),
1022
show_type_value(show_type_arg), ptr(ptr_arg)
1023
{ chain_sys_var(chain); }
1024
bool update(THD *thd, set_var *var) { return 1; }
1025
bool check_default(enum_var_type type) { return 1; }
1026
bool check_type(enum_var_type type) { return type != var_type; }
1027
bool check_update_type(Item_result type) { return 1; }
1028
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
1032
SHOW_TYPE show_type() { return show_type_value; }
1033
bool is_readonly() const { return 1; }
1037
class sys_var_const_os: public sys_var_const
1040
enum_var_type var_type;
1041
SHOW_TYPE show_type_value;
1043
sys_var_const_os(sys_var_chain *chain, const char *name_arg,
1045
SHOW_TYPE show_type_arg, uchar *ptr_arg)
1046
:sys_var_const(chain, name_arg, type, show_type_arg, ptr_arg)
1048
is_os_charset= TRUE;
1053
class sys_var_have_option: public sys_var
1056
virtual SHOW_COMP_OPTION get_option() = 0;
1058
sys_var_have_option(sys_var_chain *chain, const char *variable_name):
1059
sys_var(variable_name)
1060
{ chain_sys_var(chain); }
1061
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
1063
return (uchar*) show_comp_option_name[get_option()];
1065
bool update(THD *thd, set_var *var) { return 1; }
1066
bool check_default(enum_var_type type) { return 1; }
1067
bool check_type(enum_var_type type) { return type != OPT_GLOBAL; }
1068
bool check_update_type(Item_result type) { return 1; }
1069
SHOW_TYPE show_type() { return SHOW_CHAR; }
1070
bool is_readonly() const { return 1; }
1074
class sys_var_have_variable: public sys_var_have_option
1076
SHOW_COMP_OPTION *have_variable;
1079
sys_var_have_variable(sys_var_chain *chain, const char *variable_name,
1080
SHOW_COMP_OPTION *have_variable_arg):
1081
sys_var_have_option(chain, variable_name),
1082
have_variable(have_variable_arg)
1084
SHOW_COMP_OPTION get_option() { return *have_variable; }
1088
class sys_var_have_plugin: public sys_var_have_option
1090
const char *plugin_name_str;
1091
const uint plugin_name_len;
1092
const int plugin_type;
1095
sys_var_have_plugin(sys_var_chain *chain, const char *variable_name,
1096
const char *plugin_name_str_arg, uint plugin_name_len_arg,
1097
int plugin_type_arg):
1098
sys_var_have_option(chain, variable_name),
1099
plugin_name_str(plugin_name_str_arg), plugin_name_len(plugin_name_len_arg),
1100
plugin_type(plugin_type_arg)
1102
/* the following method is declared in sql_plugin.cc */
1103
SHOW_COMP_OPTION get_option();
1107
class sys_var_thd_time_zone :public sys_var_thd
1110
sys_var_thd_time_zone(sys_var_chain *chain, const char *name_arg,
1111
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
1112
:sys_var_thd(name_arg, NULL, binlog_status_arg)
1114
no_support_one_shot= 0;
1115
chain_sys_var(chain);
1117
bool check(THD *thd, set_var *var);
1118
SHOW_TYPE show_type() { return SHOW_CHAR; }
1119
bool check_update_type(Item_result type)
1121
return type != STRING_RESULT; /* Only accept strings */
1123
bool check_default(enum_var_type type) { return 0; }
1124
bool update(THD *thd, set_var *var);
1125
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
1126
virtual void set_default(THD *thd, enum_var_type type);
1130
class sys_var_max_user_conn : public sys_var_thd
1133
sys_var_max_user_conn(sys_var_chain *chain, const char *name_arg):
1134
sys_var_thd(name_arg)
1135
{ chain_sys_var(chain); }
1136
bool check(THD *thd, set_var *var);
1137
bool update(THD *thd, set_var *var);
1138
bool check_default(enum_var_type type)
1140
return type != OPT_GLOBAL || !option_limits;
1142
void set_default(THD *thd, enum_var_type type);
1143
SHOW_TYPE show_type() { return SHOW_INT; }
1144
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
1149
* @brief This is a specialization of sys_var_thd_ulong that implements a
1150
read-only session variable. The class overrides check() and check_default()
1151
to achieve the read-only property for the session part of the variable.
1153
class sys_var_thd_ulong_session_readonly : public sys_var_thd_ulong
1156
sys_var_thd_ulong_session_readonly(sys_var_chain *chain_arg,
1157
const char *name_arg, ulong SV::*offset_arg,
1158
sys_check_func c_func= NULL,
1159
sys_after_update_func au_func= NULL,
1160
Binlog_status_enum bl_status_arg= NOT_IN_BINLOG):
1161
sys_var_thd_ulong(chain_arg, name_arg, offset_arg, c_func, au_func, bl_status_arg)
1163
bool check(THD *thd, set_var *var);
1164
bool check_default(enum_var_type type)
1166
return type != OPT_GLOBAL || !option_limits;
1171
class sys_var_microseconds :public sys_var_thd
1173
ulonglong SV::*offset;
1175
sys_var_microseconds(sys_var_chain *chain, const char *name_arg,
1176
ulonglong SV::*offset_arg):
1177
sys_var_thd(name_arg), offset(offset_arg)
1178
{ chain_sys_var(chain); }
1179
bool check(THD *thd, set_var *var) {return 0;}
1180
bool update(THD *thd, set_var *var);
1181
void set_default(THD *thd, enum_var_type type);
1182
SHOW_TYPE show_type() { return SHOW_DOUBLE; }
1183
bool check_update_type(Item_result type)
1185
return (type != INT_RESULT && type != REAL_RESULT && type != DECIMAL_RESULT);
1187
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
1191
class sys_var_trust_routine_creators :public sys_var_bool_ptr
1193
/* We need a derived class only to have a warn_deprecated() */
1195
sys_var_trust_routine_creators(sys_var_chain *chain,
1196
const char *name_arg, my_bool *value_arg) :
1197
sys_var_bool_ptr(chain, name_arg, value_arg) {};
1198
void warn_deprecated(THD *thd);
1199
void set_default(THD *thd, enum_var_type type);
1200
bool update(THD *thd, set_var *var);
1205
Handler for setting the system variable --read-only.
1208
class sys_var_opt_readonly :public sys_var_bool_ptr
1211
sys_var_opt_readonly(sys_var_chain *chain, const char *name_arg,
1212
my_bool *value_arg) :
1213
sys_var_bool_ptr(chain, name_arg, value_arg) {};
1214
~sys_var_opt_readonly() {};
1215
bool update(THD *thd, set_var *var);
1219
class sys_var_thd_lc_time_names :public sys_var_thd
1222
sys_var_thd_lc_time_names(sys_var_chain *chain, const char *name_arg,
1223
Binlog_status_enum binlog_status_arg= NOT_IN_BINLOG)
1224
: sys_var_thd(name_arg, NULL, binlog_status_arg)
1226
#if MYSQL_VERSION_ID < 50000
1227
no_support_one_shot= 0;
1229
chain_sys_var(chain);
1231
bool check(THD *thd, set_var *var);
1232
SHOW_TYPE show_type() { return SHOW_CHAR; }
1233
bool check_update_type(Item_result type)
1235
return ((type != STRING_RESULT) && (type != INT_RESULT));
1237
bool check_default(enum_var_type type) { return 0; }
1238
bool update(THD *thd, set_var *var);
1239
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
1240
virtual void set_default(THD *thd, enum_var_type type);
1243
#ifdef HAVE_EVENT_SCHEDULER
1244
class sys_var_event_scheduler :public sys_var_long_ptr
1246
/* We need a derived class only to have a warn_deprecated() */
1248
sys_var_event_scheduler(sys_var_chain *chain, const char *name_arg) :
1249
sys_var_long_ptr(chain, name_arg, NULL, NULL) {};
1250
bool update(THD *thd, set_var *var);
1251
uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
1252
SHOW_TYPE show_type() { return SHOW_CHAR; }
1253
bool check(THD *thd, set_var *var);
1254
bool check_update_type(Item_result type)
1256
return type != STRING_RESULT && type != INT_RESULT;
1261
extern void fix_binlog_format_after_update(THD *thd, enum_var_type type);
1263
class sys_var_thd_binlog_format :public sys_var_thd_enum
1266
sys_var_thd_binlog_format(sys_var_chain *chain, const char *name_arg,
1267
ulong SV::*offset_arg)
1268
:sys_var_thd_enum(chain, name_arg, offset_arg,
1269
&binlog_format_typelib,
1270
fix_binlog_format_after_update)
1272
bool check(THD *thd, set_var *var);
1273
bool is_readonly() const;
1276
/****************************************************************************
1277
Classes for parsing of the SET command
1278
****************************************************************************/
1280
class set_var_base :public Sql_alloc
1284
virtual ~set_var_base() {}
1285
virtual int check(THD *thd)=0; /* To check privileges etc. */
1286
virtual int update(THD *thd)=0; /* To set the value */
1287
/* light check for PS */
1288
virtual int light_check(THD *thd) { return check(thd); }
1289
virtual bool no_support_one_shot() { return 1; }
1293
/* MySQL internal variables, like query_cache_size */
1295
class set_var :public set_var_base
1303
CHARSET_INFO *charset;
1305
ulonglong ulonglong_value;
1307
DATE_TIME_FORMAT *date_time_format;
1308
Time_zone *time_zone;
1309
MY_LOCALE *locale_value;
1311
LEX_STRING base; /* for structs */
1313
set_var(enum_var_type type_arg, sys_var *var_arg,
1314
const LEX_STRING *base_name_arg, Item *value_arg)
1315
:var(var_arg), type(type_arg), base(*base_name_arg)
1318
If the set value is a field, change it to a string to allow things like
1319
SET table_type=MYISAM;
1321
if (value_arg && value_arg->type() == Item::FIELD_ITEM)
1323
Item_field *item= (Item_field*) value_arg;
1324
if (!(value=new Item_string(item->field_name,
1325
(uint) strlen(item->field_name),
1326
item->collation.collation)))
1327
value=value_arg; /* Give error message later */
1332
int check(THD *thd);
1333
int update(THD *thd);
1334
int light_check(THD *thd);
1335
bool no_support_one_shot() { return var->no_support_one_shot; }
1339
/* User variables like @my_own_variable */
1341
class set_var_user: public set_var_base
1343
Item_func_set_user_var *user_var_item;
1345
set_var_user(Item_func_set_user_var *item)
1346
:user_var_item(item)
1348
int check(THD *thd);
1349
int update(THD *thd);
1350
int light_check(THD *thd);
1353
/* For SET PASSWORD */
1355
class set_var_password: public set_var_base
1360
set_var_password(LEX_USER *user_arg,char *password_arg)
1361
:user(user_arg), password(password_arg)
1363
int check(THD *thd);
1364
int update(THD *thd);
1368
/* For SET NAMES and SET CHARACTER SET */
1370
class set_var_collation_client: public set_var_base
1372
CHARSET_INFO *character_set_client;
1373
CHARSET_INFO *character_set_results;
1374
CHARSET_INFO *collation_connection;
1376
set_var_collation_client(CHARSET_INFO *client_coll_arg,
1377
CHARSET_INFO *connection_coll_arg,
1378
CHARSET_INFO *result_coll_arg)
1379
:character_set_client(client_coll_arg),
1380
character_set_results(result_coll_arg),
1381
collation_connection(connection_coll_arg)
1383
int check(THD *thd);
1384
int update(THD *thd);
1390
typedef int (*process_key_cache_t) (const char *, KEY_CACHE *);
1393
/* Named lists (used for keycaches) */
1395
class NAMED_LIST :public ilink
1402
NAMED_LIST(I_List<NAMED_LIST> *links, const char *name_arg,
1403
uint name_length_arg, uchar* data_arg)
1404
:name_length(name_length_arg), data(data_arg)
1406
name= my_strndup(name_arg, name_length, MYF(MY_WME));
1407
links->push_back(this);
1409
inline bool cmp(const char *name_cmp, uint length)
1411
return length == name_length && !memcmp(name, name_cmp, length);
1415
my_free((uchar*) name, MYF(0));
1417
friend bool process_key_caches(process_key_cache_t func);
1418
friend void delete_elements(I_List<NAMED_LIST> *list,
1419
void (*free_element)(const char*, uchar*));
1422
/* updated in sql_acl.cc */
1424
extern sys_var_thd_bool sys_old_alter_table;
1425
extern sys_var_thd_bool sys_old_passwords;
1426
extern LEX_STRING default_key_cache_base;
1429
struct sys_var_with_base
1432
LEX_STRING base_name;
1436
Prototypes for helper functions
1440
void set_var_free();
1441
SHOW_VAR* enumerate_sys_vars(THD *thd, bool sorted);
1442
int mysql_add_sys_var_chain(sys_var *chain, struct my_option *long_options);
1443
int mysql_del_sys_var_chain(sys_var *chain);
1444
sys_var *find_sys_var(THD *thd, const char *str, uint length=0);
1445
int sql_set_variables(THD *thd, List<set_var_base> *var_list);
1446
bool not_all_support_one_shot(List<set_var_base> *var_list);
1447
void fix_delay_key_write(THD *thd, enum_var_type type);
1448
void fix_slave_exec_mode(enum_var_type type);
1449
ulong fix_sql_mode(ulong sql_mode);
1450
extern sys_var_const_str sys_charset_system;
1451
extern sys_var_str sys_init_connect;
1452
extern sys_var_str sys_init_slave;
1453
extern sys_var_thd_time_zone sys_time_zone;
1454
extern sys_var_thd_bit sys_autocommit;
1455
CHARSET_INFO *get_old_charset_by_name(const char *old_name);
1456
uchar* find_named(I_List<NAMED_LIST> *list, const char *name, uint length,
1457
NAMED_LIST **found);
1459
extern sys_var_str sys_var_general_log_path, sys_var_slow_log_path;
1461
/* key_cache functions */
1462
KEY_CACHE *get_key_cache(LEX_STRING *cache_name);
1463
KEY_CACHE *get_or_create_key_cache(const char *name, uint length);
1464
void free_key_cache(const char *name, KEY_CACHE *key_cache);
1465
bool process_key_caches(process_key_cache_t func);
1466
void delete_elements(I_List<NAMED_LIST> *list,
1467
void (*free_element)(const char*, uchar*));