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item.h
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C/C++ Source or Header
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2000-09-26
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
struct st_table_list;
void item_init(void); /* Init item functions */
class Item {
Item(const Item &); /* Prevent use of theese */
void operator=(Item &);
public:
static void *operator new(size_t size) {return (void*) sql_alloc((uint) size); }
static void operator delete(void *ptr,size_t size) {} /*lint -e715 */
enum Type {FIELD_ITEM,FUNC_ITEM,SUM_FUNC_ITEM,STRING_ITEM,
INT_ITEM,REAL_ITEM,NULL_ITEM,VARBIN_ITEM,
COPY_STR_ITEM,FIELD_AVG_ITEM,
PROC_ITEM,COND_ITEM,REF_ITEM,FIELD_STD_ITEM, CONST_ITEM};
enum cond_result { COND_UNDEF,COND_OK,COND_TRUE,COND_FALSE };
String str_value; /* used to store value */
my_string name; /* Name from select */
Item *next;
uint32 max_length;
uint8 marker,decimals;
my_bool maybe_null; /* If item may be null */
my_bool null_value; /* if item is null */
my_bool binary;
my_bool with_sum_func;
// alloc & destruct is done as start of select using sql_alloc
Item();
virtual ~Item() { name=0; } /*lint -e1509 */
void set_name(char* str,uint length=0);
void init_make_field(Send_field *tmp_field,enum enum_field_types type);
virtual bool fix_fields(THD *,struct st_table_list *);
virtual bool save_in_field(Field *field);
virtual void save_org_in_field(Field *field)
{ (void) save_in_field(field); }
virtual bool send(String *str);
virtual bool eq(const Item *) const;
virtual Item_result result_type () const { return REAL_RESULT; }
virtual enum Type type() const =0;
virtual double val()=0;
virtual longlong val_int()=0;
virtual String *val_str(String*)=0;
virtual void make_field(Send_field *field)=0;
virtual Field *tmp_table_field() { return 0; }
virtual const char *full_name() const { return name ? name : "???"; }
virtual double val_result() { return val(); }
virtual longlong val_int_result() { return val_int(); }
virtual String *str_result(String* tmp) { return val_str(tmp); }
virtual table_map used_tables() const { return (table_map) 0L; }
virtual bool basic_const_item() const { return 0; }
virtual Item *new_item() { return 0; } /* Only for const items */
virtual cond_result eq_cmp_result() const { return COND_OK; }
inline uint float_length(uint decimals_par) const
{ return decimals != NOT_FIXED_DEC ? (DBL_DIG+2+decimals_par) : DBL_DIG+8;}
virtual bool const_item() const { return used_tables() == 0; }
virtual void print(String *str_arg) { str_arg->append(full_name()); }
virtual void update_used_tables() {}
virtual void split_sum_func(List<Item> &fields) {}
virtual bool get_date(TIME *ltime,bool fuzzydate);
virtual bool get_time(TIME *ltime);
};
class Item_ident :public Item
{
public:
const char *db_name;
const char *table_name;
const char *field_name;
Item_ident(const char *db_name_par,const char *table_name_par,
const char *field_name_par)
:db_name(db_name_par),table_name(table_name_par),field_name(field_name_par)
{ name = (char*) field_name_par; }
const char *full_name() const;
};
class Item_field :public Item_ident
{
void set_field(Field *field);
public:
Field *field,*result_field;
// Item_field() {}
Item_field(const char *db_par,const char *table_name_par,
const char *field_name_par)
:Item_ident(db_par,table_name_par,field_name_par),field(0),result_field(0)
{}
Item_field(Field *field);
enum Type type() const { return FIELD_ITEM; }
bool eq(const Item *item) const;
double val();
longlong val_int();
String *val_str(String*);
double val_result();
longlong val_int_result();
String *str_result(String* tmp);
bool send(String *str_arg) { return result_field->send(str_arg); }
void make_field(Send_field *field);
bool fix_fields(THD *,struct st_table_list *);
bool save_in_field(Field *field);
void save_org_in_field(Field *field);
table_map used_tables() const;
enum Item_result result_type () const
{
return field->result_type();
}
Field *tmp_table_field() { return result_field; }
bool get_date(TIME *ltime,bool fuzzydate);
bool get_time(TIME *ltime);
};
class Item_null :public Item
{
public:
Item_null(char *name_par=0)
{ maybe_null=null_value=TRUE; name= name_par ? name_par : (char*) "NULL";}
enum Type type() const { return NULL_ITEM; }
bool eq(const Item *item) const;
double val();
longlong val_int();
String *val_str(String *str);
void make_field(Send_field *field);
bool save_in_field(Field *field);
enum Item_result result_type () const
{ return STRING_RESULT; }
bool send(String *str);
bool basic_const_item() const { return 1; }
Item *new_item() { return new Item_null(name); }
};
class Item_int :public Item
{
public:
const longlong value;
Item_int(int32 i,uint length=11) :value((longlong) i)
{ max_length=length;}
#ifdef HAVE_LONG_LONG
Item_int(longlong i,uint length=21) :value(i)
{ max_length=length;}
#endif
Item_int(const char *str_arg,longlong i,uint length) :value(i)
{ max_length=length; name=(char*) str_arg;}
Item_int(const char *str_arg) :
value(str_arg[0] == '-' ? strtoll(str_arg,(char**) 0,10) :
(longlong) strtoull(str_arg,(char**) 0,10))
{ max_length= (uint) strlen(str_arg); name=(char*) str_arg;}
enum Type type() const { return INT_ITEM; }
virtual enum Item_result result_type () const { return INT_RESULT; }
longlong val_int() { return value; }
double val() { return (double) value; }
String *val_str(String*);
void make_field(Send_field *field);
bool save_in_field(Field *field);
bool basic_const_item() const { return 1; }
Item *new_item() { return new Item_int(name,value,max_length); }
void print(String *str);
};
class Item_real :public Item
{
public:
const double value;
// Item_real() :value(0) {}
Item_real(const char *str_arg,uint length) :value(atof(str_arg))
{
name=(char*) str_arg;
decimals=nr_of_decimals(str_arg);
max_length=length;
}
Item_real(const char *str,double val_arg,uint decimal_par,uint length)
:value(val_arg)
{
name=(char*) str;
decimals=decimal_par;
max_length=length;
}
Item_real(double value_par) :value(value_par) {}
bool save_in_field(Field *field);
enum Type type() const { return REAL_ITEM; }
double val() { return value; }
longlong val_int() { return (longlong) (value+(value > 0 ? 0.5 : -0.5));}
String *val_str(String*);
void make_field(Send_field *field);
bool basic_const_item() const { return 1; }
Item *new_item() { return new Item_real(name,value,decimals,max_length); }
};
class Item_float :public Item_real
{
public:
Item_float(const char *str,uint length) :Item_real(str,length)
{
decimals=NOT_FIXED_DEC;
max_length=DBL_DIG+8;
}
};
class Item_string :public Item
{
public:
Item_string(const char *str,uint length)
{
str_value.set(str,length);
max_length=length;
name=(char*) str_value.ptr();
decimals=NOT_FIXED_DEC;
}
Item_string(const char *name_par,const char *str,uint length)
{
str_value.set(str,length);
max_length=length;
name=(char*) name_par;
decimals=NOT_FIXED_DEC;
}
~Item_string() {}
enum Type type() const { return STRING_ITEM; }
double val() { return atof(str_value.ptr()); }
longlong val_int() { return strtoll(str_value.ptr(),(char**) 0,10); }
String *val_str(String*) { return (String*) &str_value; }
bool save_in_field(Field *field);
void make_field(Send_field *field);
enum Item_result result_type () const { return STRING_RESULT; }
bool basic_const_item() const { return 1; }
Item *new_item() { return new Item_string(name,str_value.ptr(),max_length); }
String *const_string() { return &str_value; }
inline void append(char *str,uint length) { str_value.append(str,length); }
void print(String *str);
};
/* for show tables */
class Item_datetime :public Item_string
{
public:
Item_datetime(const char *item_name): Item_string(item_name,"",0)
{ max_length=19;}
void make_field(Send_field *field);
};
class Item_empty_string :public Item_string
{
public:
Item_empty_string(const char *header,uint length) :Item_string("",0)
{ name=(char*) header; max_length=length;}
};
class Item_varbinary :public Item
{
public:
Item_varbinary(const char *str,uint str_length);
~Item_varbinary() {}
enum Type type() const { return VARBIN_ITEM; }
double val() { return (double) Item_varbinary::val_int(); }
longlong val_int();
String *val_str(String*) { return &str_value; }
bool save_in_field(Field *field);
void make_field(Send_field *field);
enum Item_result result_type () const { return INT_RESULT; }
};
class Item_result_field :public Item /* Item with result field */
{
public:
Field *result_field; /* Save result here */
Item_result_field() :result_field(0) {}
~Item_result_field() {} /* Required with gcc 2.95 */
Field *tmp_table_field() { return result_field; }
virtual void fix_length_and_dec()=0;
};
class Item_ref :public Item_ident
{
Item **ref;
public:
Item_ref(char *db_par,char *table_name_par,char *field_name_par)
:Item_ident(db_par,table_name_par,field_name_par),ref(0) {}
Item_ref(Item **item, char *table_name_par,char *field_name_par)
:Item_ident(NullS,table_name_par,field_name_par),ref(item) {}
enum Type type() const { return REF_ITEM; }
bool eq(const Item *item) const { return (*ref)->eq(item); }
~Item_ref() { if (ref) delete *ref; }
double val()
{
double tmp=(*ref)->val_result();
null_value=(*ref)->null_value;
return tmp;
}
longlong val_int()
{
longlong tmp=(*ref)->val_int_result();
null_value=(*ref)->null_value;
return tmp;
}
String *val_str(String* tmp)
{
tmp=(*ref)->str_result(tmp);
null_value=(*ref)->null_value;
return tmp;
}
bool get_date(TIME *ltime,bool fuzzydate)
{
return (null_value=(*ref)->get_date(ltime,fuzzydate));
}
bool send(String *tmp) { return (*ref)->send(tmp); }
void make_field(Send_field *field) { (*ref)->make_field(field); }
bool fix_fields(THD *,struct st_table_list *);
bool save_in_field(Field *field) { return (*ref)->save_in_field(field); }
void save_org_in_field(Field *field) { (*ref)->save_org_in_field(field); }
enum Item_result result_type () const { return (*ref)->result_type(); }
table_map used_tables() const { return (*ref)->used_tables(); }
};
#include "item_sum.h"
#include "item_func.h"
#include "item_cmpfunc.h"
#include "item_strfunc.h"
#include "item_timefunc.h"
#include "item_uniq.h"
class Item_copy_string :public Item
{
public:
Item *item;
Item_copy_string(Item *i) :item(i)
{
null_value=maybe_null=item->maybe_null;
decimals=item->decimals;
max_length=item->max_length;
name=item->name;
}
~Item_copy_string() { delete item; }
enum Type type() const { return COPY_STR_ITEM; }
enum Item_result result_type () const { return STRING_RESULT; }
double val()
{ return null_value ? 0.0 : atof(str_value.c_ptr()); }
longlong val_int()
{ return null_value ? LL(0) : strtoll(str_value.c_ptr(),(char**) 0,10); }
String *val_str(String*);
void make_field(Send_field *field) { item->make_field(field); }
void copy();
table_map used_tables() const { return (table_map) 1L; }
bool const_item() const { return 0; }
};
class Item_buff :public Sql_alloc
{
public:
my_bool null_value;
Item_buff() :null_value(0) {}
virtual bool cmp(void)=0;
virtual ~Item_buff(); /*line -e1509 */
};
class Item_str_buff :public Item_buff
{
Item *item;
String value,tmp_value;
public:
Item_str_buff(Item *arg) :item(arg),value(arg->max_length) {}
bool cmp(void);
~Item_str_buff(); // Deallocate String:s
};
class Item_real_buff :public Item_buff
{
Item *item;
double value;
public:
Item_real_buff(Item *item_par) :item(item_par),value(0.0) {}
bool cmp(void);
};
class Item_int_buff :public Item_buff
{
Item *item;
longlong value;
public:
Item_int_buff(Item *item_par) :item(item_par),value(0) {}
bool cmp(void);
};
class Item_field_buff :public Item_buff
{
char *buff;
Field *field;
uint length;
public:
Item_field_buff(Item_field *item)
{
field=item->field;
buff= (char*) sql_calloc(length=field->pack_length());
}
bool cmp(void);
};
extern Item_buff *new_Item_buff(Item *item);
extern Item_result item_cmp_type(Item_result a,Item_result b);
extern Item *resolve_const_item(Item *item,Item *cmp_item);
extern bool field_is_equal_to_item(Field *field,Item *item);
Item *get_system_var(LEX_STRING name);