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6523aca729
Corrected spelling in copyright text Makefile.am: Don't update the files from BitKeeper Many files: Removed "MySQL Finland AB & TCX DataKonsult AB" from copyright header Adjusted year(s) in copyright header Many files: Added GPL copyright text Removed files: Docs/Support/colspec-fix.pl Docs/Support/docbook-fixup.pl Docs/Support/docbook-prefix.pl Docs/Support/docbook-split Docs/Support/make-docbook Docs/Support/make-makefile Docs/Support/test-make-manual Docs/Support/test-make-manual-de Docs/Support/xwf
158 lines
3.7 KiB
C++
158 lines
3.7 KiB
C++
/* Copyright (C) 2000-2006 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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/* Buffers to save and compare item values */
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#include "mysql_priv.h"
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/*
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** Create right type of Cached_item for an item
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*/
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Cached_item *new_Cached_item(THD *thd, Item *item)
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{
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if (item->real_item()->type() == Item::FIELD_ITEM &&
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!(((Item_field *) (item->real_item()))->field->flags & BLOB_FLAG))
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return new Cached_item_field((Item_field *) (item->real_item()));
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switch (item->result_type()) {
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case STRING_RESULT:
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return new Cached_item_str(thd, (Item_field *) item);
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case INT_RESULT:
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return new Cached_item_int((Item_field *) item);
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case REAL_RESULT:
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return new Cached_item_real(item);
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case DECIMAL_RESULT:
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return new Cached_item_decimal(item);
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case ROW_RESULT:
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default:
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DBUG_ASSERT(0);
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return 0;
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}
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}
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Cached_item::~Cached_item() {}
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/*
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** Compare with old value and replace value with new value
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** Return true if values have changed
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*/
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Cached_item_str::Cached_item_str(THD *thd, Item *arg)
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:item(arg), value(min(arg->max_length, thd->variables.max_sort_length))
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{}
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bool Cached_item_str::cmp(void)
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{
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String *res;
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bool tmp;
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if ((res=item->val_str(&tmp_value)))
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res->length(min(res->length(), value.alloced_length()));
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if (null_value != item->null_value)
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{
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if ((null_value= item->null_value))
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return TRUE; // New value was null
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tmp=TRUE;
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}
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else if (null_value)
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return 0; // new and old value was null
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else
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tmp= sortcmp(&value,res,item->collation.collation) != 0;
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if (tmp)
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value.copy(*res); // Remember for next cmp
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return tmp;
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}
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Cached_item_str::~Cached_item_str()
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{
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item=0; // Safety
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}
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bool Cached_item_real::cmp(void)
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{
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double nr= item->val_real();
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if (null_value != item->null_value || nr != value)
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{
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null_value= item->null_value;
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value=nr;
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return TRUE;
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}
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return FALSE;
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}
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bool Cached_item_int::cmp(void)
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{
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longlong nr=item->val_int();
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if (null_value != item->null_value || nr != value)
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{
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null_value= item->null_value;
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value=nr;
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return TRUE;
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}
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return FALSE;
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}
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bool Cached_item_field::cmp(void)
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{
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bool tmp= field->cmp(buff) != 0; // This is not a blob!
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if (tmp)
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field->get_image(buff,length,field->charset());
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if (null_value != field->is_null())
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{
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null_value= !null_value;
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tmp=TRUE;
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}
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return tmp;
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}
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Cached_item_decimal::Cached_item_decimal(Item *it)
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:item(it)
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{
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my_decimal_set_zero(&value);
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}
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bool Cached_item_decimal::cmp()
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{
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my_decimal tmp;
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my_decimal *ptmp= item->val_decimal(&tmp);
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if (null_value != item->null_value ||
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(!item->null_value && my_decimal_cmp(&value, ptmp)))
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{
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null_value= item->null_value;
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/* Save only not null values */
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if (!null_value)
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{
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my_decimal2decimal(ptmp, &value);
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return TRUE;
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}
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return FALSE;
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}
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return FALSE;
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}
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/*****************************************************************************
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** Instansiate templates
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*****************************************************************************/
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#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
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template class List<Cached_item>;
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template class List_iterator<Cached_item>;
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#endif
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