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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <drizzled/server_includes.h>
#include <drizzled/error.h>
#include <drizzled/name_resolution_context.h>
#include <drizzled/table.h>
#include <drizzled/session.h>
#include <drizzled/current_session.h>
#include <drizzled/item/default_value.h>
bool Item_default_value::eq(const Item *item, bool binary_cmp) const
{
return item->type() == DEFAULT_VALUE_ITEM &&
((Item_default_value *)item)->arg->eq(arg, binary_cmp);
}
bool Item_default_value::fix_fields(Session *session, Item **)
{
Item *real_arg;
Item_field *field_arg;
Field *def_field;
assert(fixed == 0);
if (!arg)
{
fixed= 1;
return false;
}
if (!arg->fixed && arg->fix_fields(session, &arg))
goto error;
real_arg= arg->real_item();
if (real_arg->type() != FIELD_ITEM)
{
my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), arg->name);
goto error;
}
field_arg= (Item_field *)real_arg;
if (field_arg->field->flags & NO_DEFAULT_VALUE_FLAG)
{
my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), field_arg->field->field_name);
goto error;
}
if (!(def_field= (Field*) sql_alloc(field_arg->field->size_of())))
goto error;
memcpy(def_field, field_arg->field, field_arg->field->size_of());
def_field->move_field_offset((my_ptrdiff_t)
(def_field->table->s->default_values -
def_field->table->record[0]));
set_field(def_field);
return false;
error:
context->process_error(session);
return true;
}
void Item_default_value::print(String *str, enum_query_type query_type)
{
if (!arg)
{
str->append(STRING_WITH_LEN("default"));
return;
}
str->append(STRING_WITH_LEN("default("));
arg->print(str, query_type);
str->append(')');
}
int Item_default_value::save_in_field(Field *field_arg, bool no_conversions)
{
if (!arg)
{
if (field_arg->flags & NO_DEFAULT_VALUE_FLAG)
{
if (field_arg->reset())
{
my_message(ER_CANT_CREATE_GEOMETRY_OBJECT,
ER(ER_CANT_CREATE_GEOMETRY_OBJECT), MYF(0));
return -1;
}
{
push_warning_printf(field_arg->table->in_use,
DRIZZLE_ERROR::WARN_LEVEL_WARN,
ER_NO_DEFAULT_FOR_FIELD,
ER(ER_NO_DEFAULT_FOR_FIELD),
field_arg->field_name);
}
return 1;
}
field_arg->set_default();
return 0;
}
return Item_field::save_in_field(field_arg, no_conversions);
}
/**
This method like the walk method traverses the item tree, but at the
same time it can replace some nodes in the tree.
*/
Item *Item_default_value::transform(Item_transformer transformer, unsigned char *args)
{
Item *new_item= arg->transform(transformer, args);
if (!new_item)
return NULL;
/*
Session::change_item_tree() should be called only if the tree was
really transformed, i.e. when a new item has been created.
Otherwise we'll be allocating a lot of unnecessary memory for
change records at each execution.
*/
if (arg != new_item)
current_session->change_item_tree(&arg, new_item);
return (this->*transformer)(args);
}
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