mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 20:12:31 +01:00
471 lines
14 KiB
C++
471 lines
14 KiB
C++
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
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(at your option) any later version.
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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 __GNUC__
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#pragma interface /* gcc class implementation */
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#endif
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/****************************************************************************
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Variables that are changable runtime are declared using the
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following classes
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****************************************************************************/
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class sys_var;
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class set_var;
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typedef struct system_variables SV;
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extern TYPELIB bool_typelib, delay_key_write_typelib;
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enum enum_var_type
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{
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OPT_DEFAULT, OPT_SESSION, OPT_GLOBAL
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};
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typedef bool (*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 byte *(*sys_value_ptr_func)(THD *thd);
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class sys_var
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{
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public:
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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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const char *name;
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sys_after_update_func after_update;
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sys_var(const char *name_arg) :name(name_arg),after_update(0)
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{}
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sys_var(const char *name_arg,sys_after_update_func func)
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:name(name_arg),after_update(func)
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{}
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virtual ~sys_var() {}
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virtual bool check(THD *thd, set_var *var) { return 0; }
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bool check_enum(THD *thd, set_var *var, TYPELIB *enum_names);
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virtual bool update(THD *thd, set_var *var)=0;
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virtual void set_default(THD *thd, enum_var_type type) {}
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virtual SHOW_TYPE type() { return SHOW_UNDEF; }
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virtual byte *value_ptr(THD *thd, enum_var_type type) { return 0; }
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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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Item *item(THD *thd, enum_var_type type);
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};
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class sys_var_long_ptr :public sys_var
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{
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public:
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ulong *value;
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sys_var_long_ptr(const char *name_arg, ulong *value_ptr)
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:sys_var(name_arg),value(value_ptr) {}
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sys_var_long_ptr(const char *name_arg, ulong *value_ptr,
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sys_after_update_func func)
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:sys_var(name_arg,func), value(value_ptr) {}
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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 type() { return SHOW_LONG; }
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byte *value_ptr(THD *thd, enum_var_type type) { return (byte*) value; }
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};
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class sys_var_bool_ptr :public sys_var
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{
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public:
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my_bool *value;
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sys_var_bool_ptr(const char *name_arg, my_bool *value_arg)
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:sys_var(name_arg),value(value_arg)
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{}
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bool check(THD *thd, set_var *var)
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{
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return check_enum(thd, var, &bool_typelib);
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}
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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 type() { return SHOW_MY_BOOL; }
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byte *value_ptr(THD *thd, enum_var_type type) { return (byte*) value; }
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bool check_update_type(Item_result type) { return 0; }
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};
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class sys_var_str :public sys_var
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{
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public:
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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(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), 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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{}
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bool check(THD *thd, set_var *var)
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{
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return check_func ? (*check_func)(thd, var) : 0;
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}
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bool update(THD *thd, set_var *var)
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{
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return (*update_func)(thd, var);
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}
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void set_default(THD *thd, enum_var_type type)
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{
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(*set_default_func)(thd, type);
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}
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SHOW_TYPE type() { return SHOW_CHAR; }
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byte *value_ptr(THD *thd, enum_var_type type) { return (byte*) value; }
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bool check_update_type(Item_result type)
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{
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return type != STRING_RESULT; /* Only accept strings */
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}
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bool check_default(enum_var_type type) { return 0; }
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};
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class sys_var_enum :public sys_var
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{
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uint *value;
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TYPELIB *enum_names;
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public:
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sys_var_enum(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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{}
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bool check(THD *thd, set_var *var)
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{
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return check_enum(thd, var, enum_names);
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}
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bool update(THD *thd, set_var *var);
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SHOW_TYPE type() { return SHOW_CHAR; }
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byte *value_ptr(THD *thd, enum_var_type type);
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bool check_update_type(Item_result type) { return 0; }
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};
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class sys_var_thd :public sys_var
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{
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public:
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sys_var_thd(const char *name_arg)
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:sys_var(name_arg)
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{}
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sys_var_thd(const char *name_arg, sys_after_update_func func)
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:sys_var(name_arg,func)
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{}
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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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{
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return type == OPT_GLOBAL && !option_limits;
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}
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};
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class sys_var_thd_ulong :public sys_var_thd
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{
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public:
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ulong SV::*offset;
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sys_var_thd_ulong(const char *name_arg, ulong SV::*offset_arg)
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:sys_var_thd(name_arg), offset(offset_arg)
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{}
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sys_var_thd_ulong(const char *name_arg, ulong 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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{}
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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 type() { return SHOW_LONG; }
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byte *value_ptr(THD *thd, enum_var_type type);
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};
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class sys_var_thd_ulonglong :public sys_var_thd
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{
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public:
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ulonglong SV::*offset;
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sys_var_thd_ulonglong(const char *name_arg, ulonglong SV::*offset_arg)
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:sys_var_thd(name_arg), offset(offset_arg)
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{}
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sys_var_thd_ulonglong(const char *name_arg, ulonglong 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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{}
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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 type() { return SHOW_LONGLONG; }
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byte *value_ptr(THD *thd, enum_var_type type);
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};
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class sys_var_thd_bool :public sys_var_thd
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{
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public:
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my_bool SV::*offset;
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sys_var_thd_bool(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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{}
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sys_var_thd_bool(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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{}
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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 type() { return SHOW_MY_BOOL; }
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byte *value_ptr(THD *thd, enum_var_type type);
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bool check(THD *thd, set_var *var)
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{
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return check_enum(thd, var, &bool_typelib);
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}
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bool check_update_type(Item_result type) { return 0; }
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};
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class sys_var_thd_enum :public sys_var_thd
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{
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ulong SV::*offset;
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TYPELIB *enum_names;
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public:
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sys_var_thd_enum(const char *name_arg, ulong SV::*offset_arg,
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TYPELIB *typelib)
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:sys_var_thd(name_arg), offset(offset_arg), enum_names(typelib)
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{}
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sys_var_thd_enum(const char *name_arg, ulong SV::*offset_arg,
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TYPELIB *typelib,
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sys_after_update_func func)
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:sys_var_thd(name_arg,func), offset(offset_arg), enum_names(typelib)
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{}
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bool check(THD *thd, set_var *var)
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{
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return check_enum(thd, var, enum_names);
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}
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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 type() { return SHOW_CHAR; }
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byte *value_ptr(THD *thd, enum_var_type type);
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bool check_update_type(Item_result type) { return 0; }
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};
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class sys_var_thd_bit :public sys_var_thd
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{
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sys_update_func update_func;
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public:
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ulong bit_flag;
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bool reverse;
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sys_var_thd_bit(const char *name_arg, sys_update_func func, ulong bit,
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bool reverse_arg=0)
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:sys_var_thd(name_arg), update_func(func), bit_flag(bit),
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reverse(reverse_arg)
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{}
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bool check(THD *thd, set_var *var)
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{
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return check_enum(thd, var, &bool_typelib);
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}
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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 type() { return SHOW_MY_BOOL; }
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byte *value_ptr(THD *thd, enum_var_type type);
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};
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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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{
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public:
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sys_var_timestamp(const char *name_arg) :sys_var(name_arg) {}
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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 type() { return SHOW_LONG; }
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byte *value_ptr(THD *thd, enum_var_type type);
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};
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class sys_var_last_insert_id :public sys_var
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{
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public:
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sys_var_last_insert_id(const char *name_arg) :sys_var(name_arg) {}
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bool update(THD *thd, set_var *var);
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bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
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SHOW_TYPE type() { return SHOW_LONGLONG; }
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byte *value_ptr(THD *thd, enum_var_type type);
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};
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class sys_var_insert_id :public sys_var
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{
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public:
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sys_var_insert_id(const char *name_arg) :sys_var(name_arg) {}
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bool update(THD *thd, set_var *var);
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bool check_type(enum_var_type type) { return type == OPT_GLOBAL; }
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SHOW_TYPE type() { return SHOW_LONGLONG; }
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byte *value_ptr(THD *thd, enum_var_type type);
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};
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class sys_var_slave_skip_counter :public sys_var
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{
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public:
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sys_var_slave_skip_counter(const char *name_arg) :sys_var(name_arg) {}
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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_type(enum_var_type type) { return type != OPT_GLOBAL; }
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/*
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We can't retrieve the value of this, so we don't have to define
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type() or value_ptr()
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*/
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};
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class sys_var_thd_conv_charset :public sys_var_thd
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{
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public:
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sys_var_thd_conv_charset(const char *name_arg)
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:sys_var_thd(name_arg)
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{}
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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 type() { return SHOW_CHAR; }
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byte *value_ptr(THD *thd, enum_var_type type);
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bool check_update_type(Item_result type)
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{
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return type != STRING_RESULT; /* Only accept strings */
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}
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bool check_default(enum_var_type type) { return 0; }
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};
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/* Variable that you can only read from */
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class sys_var_readonly: public sys_var
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{
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public:
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enum_var_type var_type;
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SHOW_TYPE show_type;
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sys_value_ptr_func value_ptr_func;
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sys_var_readonly(const char *name_arg, enum_var_type type,
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SHOW_TYPE show_type_arg,
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sys_value_ptr_func value_ptr_func_arg)
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:sys_var(name_arg), var_type(type),
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show_type(show_type_arg), value_ptr_func(value_ptr_func_arg)
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{}
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bool update(THD *thd, set_var *var) { return 1; }
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bool check_default(enum_var_type type) { return 1; }
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bool check_type(enum_var_type type) { return type != var_type; }
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bool check_update_type(Item_result type) { return 1; }
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byte *value_ptr(THD *thd, enum_var_type type)
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{
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return (*value_ptr_func)(thd);
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}
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SHOW_TYPE type() { return show_type; }
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};
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/****************************************************************************
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Classes for parsing of the SET command
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****************************************************************************/
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class set_var_base :public Sql_alloc
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{
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public:
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set_var_base() {}
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virtual ~set_var_base() {}
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virtual int check(THD *thd)=0; /* To check privileges etc. */
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virtual int update(THD *thd)=0; /* To set the value */
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};
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/* MySQL internal variables, like query_cache_size */
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class set_var :public set_var_base
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{
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public:
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sys_var *var;
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Item *value;
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enum_var_type type;
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union
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{
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CONVERT *convert;
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ulong ulong_value;
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} save_result;
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set_var(enum_var_type type_arg, sys_var *var_arg, Item *value_arg)
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:var(var_arg), type(type_arg)
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{
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/*
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If the set value is a field, change it to a string to allow things like
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SET table_type=MYISAM;
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*/
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if (value_arg && value_arg->type() == Item::FIELD_ITEM)
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{
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Item_field *item= (Item_field*) value_arg;
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if (!(value=new Item_string(item->field_name, strlen(item->field_name),
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system_charset_info)))
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value=value_arg; /* Give error message later */
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}
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else
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value=value_arg;
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}
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int check(THD *thd);
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int update(THD *thd);
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};
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/* User variables like @my_own_variable */
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class set_var_user: public set_var_base
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{
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Item_func_set_user_var *user_var_item;
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public:
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set_var_user(Item_func_set_user_var *item)
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:user_var_item(item)
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{}
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int check(THD *thd);
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int update(THD *thd);
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};
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/* For SET PASSWORD */
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class set_var_password: public set_var_base
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{
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LEX_USER *user;
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char *password;
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public:
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set_var_password(LEX_USER *user_arg,char *password_arg)
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:user(user_arg), password(password_arg)
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{}
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int check(THD *thd);
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int update(THD *thd);
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};
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/*
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Prototypes for helper functions
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*/
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void set_var_init();
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void set_var_free();
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sys_var *find_sys_var(const char *str, uint length=0);
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int sql_set_variables(THD *thd, List<set_var_base> *var_list);
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void fix_delay_key_write(THD *thd, enum_var_type type);
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extern sys_var_str sys_charset;
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