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MySQL 5.1: Item_func_make_set Class Reference

Item_func_make_set Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_make_set:

[legend]Collaboration diagram for Item_func_make_set:

[legend]List of all members.


Public Member Functions
	Item_func_make_set (Item *a, List< Item > &list)
String *	val_str (String *str)
bool	fix_fields (THD thd, Item *ref)
void	split_sum_func (THD thd, Item *ref_pointer_array, List< Item > &fields)
void	fix_length_and_dec ()
void	update_used_tables ()
const char *	func_name () const
bool	walk (Item_processor processor, bool walk_subquery, byte *arg)
Item *	transform (Item_transformer transformer, byte *arg)
void	print (String *str)
Private Attributes
Item *	item
String	tmp_str

Detailed Description

Definition at line 462 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_make_set::Item_func_make_set	(	Item *	a,
		List< Item > &	list
	)			`[inline]`

Definition at line 468 of file item_strfunc.h.

00468 :Item_str_func(list),item(a) {}

Member Function Documentation

bool Item_func_make_set::fix_fields	(	THD *	thd,
		Item **	ref
	)			`[inline, virtual]`

Reimplemented from Item_func.

Definition at line 470 of file item_strfunc.h.

References Item::check_cols(), DBUG_ASSERT, Item_func::fix_fields(), Item::fix_fields(), Item::fixed, and item.

00471   {
00472     DBUG_ASSERT(fixed == 0);
00473     return ((!item->fixed && item->fix_fields(thd, &item)) ||
00474             item->check_cols(1) ||
00475             Item_func::fix_fields(thd, ref));
00476   }

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void Item_func_make_set::fix_length_and_dec ( ) [virtual]

Implements Item_result_field.

Definition at line 1975 of file item_strfunc.cc.

References Item_func::agg_arg_charsets(), Item_func::arg_count, Item_func::args, Item::collation, Item::const_item(), Item_func::const_item_cache, item, Item::max_length, MY_COLL_ALLOW_CONV, Item::not_null_tables(), Item_func::not_null_tables_cache, Item::used_tables(), Item_func::used_tables_cache, and Item::with_sum_func.

01976 {
01977   max_length=arg_count-1;
01978 
01979   if (agg_arg_charsets(collation, args, arg_count, MY_COLL_ALLOW_CONV, 1))
01980     return;
01981   
01982   for (uint i=0 ; i < arg_count ; i++)
01983     max_length+=args[i]->max_length;
01984 
01985   used_tables_cache|=     item->used_tables();
01986   not_null_tables_cache&= item->not_null_tables();
01987   const_item_cache&=      item->const_item();
01988   with_sum_func= with_sum_func || item->with_sum_func;
01989 }

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const char* Item_func_make_set::func_name ( ) const [inline, virtual]

Implements Item_func.

Definition at line 480 of file item_strfunc.h.

00480 { return "make_set"; }

void Item_func_make_set::print ( String * str ) [virtual]

Reimplemented from Item_func.

Definition at line 2054 of file item_strfunc.cc.

References String::append(), Item_func::arg_count, item, Item::print(), Item_func::print_args(), and STRING_WITH_LEN.

02055 {
02056   str->append(STRING_WITH_LEN("make_set("));
02057   item->print(str);
02058   if (arg_count)
02059   {
02060     str->append(',');
02061     print_args(str, 0);
02062   }
02063   str->append(')');
02064 }

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void Item_func_make_set::split_sum_func	(	THD *	thd,
		Item **	ref_pointer_array,
		List< Item > &	fields
	)			`[virtual]`

Reimplemented from Item_func.

Definition at line 1967 of file item_strfunc.cc.

References item, Item_func::split_sum_func(), Item::split_sum_func2(), and TRUE.

01969 {
01970   item->split_sum_func2(thd, ref_pointer_array, fields, &item, TRUE);
01971   Item_str_func::split_sum_func(thd, ref_pointer_array, fields);
01972 }

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Item* Item_func_make_set::transform	(	Item_transformer	transformer,
		byte *	arg
	)			`[inline, virtual]`

Reimplemented from Item_func.

Definition at line 487 of file item_strfunc.h.

References item, Item::new_item(), Item_func::transform(), and Item::transform().

00488   {
00489     Item *new_item= item->transform(transformer, arg);
00490     if (!new_item)
00491       return 0;
00492     item= new_item;
00493     return Item_str_func::transform(transformer, arg);
00494   }

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void Item_func_make_set::update_used_tables ( ) [virtual]

Reimplemented from Item_func.

Definition at line 1992 of file item_strfunc.cc.

References Item::const_item(), Item_func::const_item_cache, item, Item::update_used_tables(), Item_func::update_used_tables(), Item::used_tables(), and Item_func::used_tables_cache.

01993 {
01994   Item_func::update_used_tables();
01995   item->update_used_tables();
01996   used_tables_cache|=item->used_tables();
01997   const_item_cache&=item->const_item();
01998 }

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String * Item_func_make_set::val_str ( String * str ) [virtual]

Implements Item.

Definition at line 2001 of file item_strfunc.cc.

References String::alloc(), String::append(), Item_func::arg_count, Item_func::args, String::copy(), DBUG_ASSERT, Item::fixed, item, String::length(), my_empty_string(), NULL, Item::null_value, tmp_str, and Item::val_int().

02002 {
02003   DBUG_ASSERT(fixed == 1);
02004   ulonglong bits;
02005   bool first_found=0;
02006   Item **ptr=args;
02007   String *result=&my_empty_string;
02008 
02009   bits=item->val_int();
02010   if ((null_value=item->null_value))
02011     return NULL;
02012 
02013   if (arg_count < 64)
02014     bits &= ((ulonglong) 1 << arg_count)-1;
02015 
02016   for (; bits; bits >>= 1, ptr++)
02017   {
02018     if (bits & 1)
02019     {
02020       String *res= (*ptr)->val_str(str);
02021       if (res)                                  // Skip nulls
02022       {
02023         if (!first_found)
02024         {                                       // First argument
02025           first_found=1;
02026           if (res != str)
02027             result=res;                         // Use original string
02028           else
02029           {
02030             if (tmp_str.copy(*res))             // Don't use 'str'
02031               return &my_empty_string;
02032             result= &tmp_str;
02033           }
02034         }
02035         else
02036         {
02037           if (result != &tmp_str)
02038           {                                     // Copy data to tmp_str
02039             if (tmp_str.alloc(result->length()+res->length()+1) ||
02040                 tmp_str.copy(*result))
02041               return &my_empty_string;
02042             result= &tmp_str;
02043           }
02044           if (tmp_str.append(',') || tmp_str.append(*res))
02045             return &my_empty_string;
02046         }
02047       }
02048     }
02049   }
02050   return result;
02051 }

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bool Item_func_make_set::walk	(	Item_processor	processor,
		bool	walk_subquery,
		byte *	arg
	)			`[inline, virtual]`

Reimplemented from Item_func.

Definition at line 482 of file item_strfunc.h.

References item, Item_func::walk(), and Item::walk().

00483   {
00484     return item->walk(processor, walk_subquery, arg) ||
00485       Item_str_func::walk(processor, walk_subquery, arg);
00486   }

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Member Data Documentation

Item* Item_func_make_set::item [private]

Definition at line 464 of file item_strfunc.h.

Referenced by fix_fields(), fix_length_and_dec(), print(), split_sum_func(), transform(), update_used_tables(), val_str(), and walk().

String Item_func_make_set::tmp_str [private]

Definition at line 465 of file item_strfunc.h.

Referenced by val_str().

The documentation for this class was generated from the following files:

mysql/src/5.1-dbg/sql/item_strfunc.h
mysql/src/5.1-dbg/sql/item_strfunc.cc

Generated on Sat Sep 9 21:36:41 2006 for MySQL 5.1 by

1.4.7

The world's most popular open source database

Item_func_make_set Class Reference

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation