Skip navigation links

MySQL Newsletter - Subscribe Today!

The world's most popular open source database

MySQL 5.1: Item_sum_count Class Reference

Item_sum_count Class Reference

#include <item_sum.h>

Inheritance diagram for Item_sum_count:

Inheritance graph
[legend]
Collaboration diagram for Item_sum_count:

Collaboration graph
[legend]
List of all members.

Public Member Functions

 Item_sum_count (Item *item_par)
 Item_sum_count (THD *thd, Item_sum_count *item)
table_map used_tables () const
bool const_item () const
enum Sumfunctype sum_func () const
void clear ()
void no_rows_in_result ()
bool add ()
void make_const (longlong count_arg)
longlong val_int ()
void reset_field ()
void cleanup ()
void update_field ()
const char * func_name () const
Item * copy_or_same (THD *thd)

Private Attributes

longlong count
table_map used_table_cache

Detailed Description

Definition at line 468 of file item_sum.h.

Constructor & Destructor Documentation

Item_sum_count::Item_sum_count ( Item *  item_par  )  [inline]

Definition at line 474 of file item_sum.h.

Referenced by copy_or_same().

00475     :Item_sum_int(item_par),count(0),used_table_cache(~(table_map) 0)
00476   {}

Here is the caller graph for this function:

Item_sum_count::Item_sum_count ( THD *  thd,
Item_sum_count *  item 
) [inline]

Definition at line 477 of file item_sum.h.

00478     :Item_sum_int(thd, item), count(item->count),
00479      used_table_cache(item->used_table_cache)
00480   {}

Member Function Documentation

bool Item_sum_count::add (  )  [virtual]

Implements Item_sum.

Definition at line 1023 of file item_sum.cc.

References Item_sum::args, count, Item::maybe_null, Item::null_value, and val_int().

01024 {
01025   if (!args[0]->maybe_null)
01026     count++;
01027   else
01028   {
01029     (void) args[0]->val_int();
01030     if (!args[0]->null_value)
01031       count++;
01032   }
01033   return 0;
01034 }

Here is the call graph for this function:

void Item_sum_count::cleanup (  )  [virtual]

Reimplemented from Item_result_field.

Definition at line 1043 of file item_sum.cc.

References Item_result_field::cleanup(), DBUG_ENTER, DBUG_VOID_RETURN, and used_table_cache.

01044 {
01045   DBUG_ENTER("Item_sum_count::cleanup");
01046   Item_sum_int::cleanup();
01047   used_table_cache= ~(table_map) 0;
01048   DBUG_VOID_RETURN;
01049 }

Here is the call graph for this function:

void Item_sum_count::clear (  )  [virtual]

Implements Item_sum.

Definition at line 1017 of file item_sum.cc.

References count.

01018 {
01019   count= 0;
01020 }

bool Item_sum_count::const_item (  )  const [inline, virtual]

Reimplemented from Item_sum.

Definition at line 482 of file item_sum.h.

References used_table_cache.

00482 { return !used_table_cache; }

Item * Item_sum_count::copy_or_same ( THD *  thd  )  [virtual]

Reimplemented from Item.

Definition at line 1011 of file item_sum.cc.

References Item_sum_count().

01012 {
01013   return new (thd->mem_root) Item_sum_count(thd, this);
01014 }

Here is the call graph for this function:

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

Implements Item_sum.

Definition at line 492 of file item_sum.h.

00492 { return "count("; }

void Item_sum_count::make_const ( longlong  count_arg  )  [inline]

Definition at line 487 of file item_sum.h.

References count, and used_table_cache.

00487 { count=count_arg; used_table_cache=0; }

void Item_sum_count::no_rows_in_result (  )  [inline, virtual]

Reimplemented from Item_sum.

Definition at line 485 of file item_sum.h.

References count.

00485 { count=0; }

void Item_sum_count::reset_field (  )  [virtual]

Reimplemented from Item_sum_num.

Definition at line 1935 of file item_sum.cc.

References Item_sum::args, int8store, Item::maybe_null, Item::null_value, Field::ptr, Item_result_field::result_field, and val_int().

01936 {
01937   char *res=result_field->ptr;
01938   longlong nr=0;
01939 
01940   if (!args[0]->maybe_null)
01941     nr=1;
01942   else
01943   {
01944     (void) args[0]->val_int();
01945     if (!args[0]->null_value)
01946       nr=1;
01947   }
01948   int8store(res,nr);
01949 }

Here is the call graph for this function:

enum Sumfunctype Item_sum_count::sum_func (  )  const [inline, virtual]

Implements Item_sum.

Definition at line 483 of file item_sum.h.

References Item_sum::COUNT_FUNC.

00483 { return COUNT_FUNC; }

void Item_sum_count::update_field (  )  [virtual]

Implements Item_sum.

Definition at line 2044 of file item_sum.cc.

References Item_sum::args, int8store, Item::maybe_null, Item::null_value, Field::ptr, Item_result_field::result_field, sint8korr, and val_int().

02045 {
02046   longlong nr;
02047   char *res=result_field->ptr;
02048 
02049   nr=sint8korr(res);
02050   if (!args[0]->maybe_null)
02051     nr++;
02052   else
02053   {
02054     (void) args[0]->val_int();
02055     if (!args[0]->null_value)
02056       nr++;
02057   }
02058   int8store(res,nr);
02059 }

Here is the call graph for this function:

table_map Item_sum_count::used_tables (  )  const [inline, virtual]

Reimplemented from Item_sum.

Definition at line 481 of file item_sum.h.

References used_table_cache.

00481 { return used_table_cache; }

longlong Item_sum_count::val_int (  )  [virtual]

Reimplemented from Item_sum_num.

Definition at line 1036 of file item_sum.cc.

References count, DBUG_ASSERT, and Item::fixed.

Referenced by add(), reset_field(), and update_field().

01037 {
01038   DBUG_ASSERT(fixed == 1);
01039   return (longlong) count;
01040 }

Here is the caller graph for this function:

Member Data Documentation

longlong Item_sum_count::count [private]

Definition at line 470 of file item_sum.h.

Referenced by add(), clear(), make_const(), no_rows_in_result(), and val_int().

table_map Item_sum_count::used_table_cache [private]

Definition at line 471 of file item_sum.h.

Referenced by cleanup(), const_item(), make_const(), and used_tables().

The documentation for this class was generated from the following files:
Generated on Sat Sep 9 21:55:52 2006 for MySQL 5.1 by  doxygen 1.4.7