~drizzle-trunk/drizzle/development

/* -*- 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 "config.h"

#include <drizzled/error.h>

#include <drizzled/name_resolution_context.h>

#include <drizzled/table.h>

#include <drizzled/item/insert_value.h>

#include <drizzled/item/ref.h>

#include <drizzled/item/copy_string.h>

#include <drizzled/item/default_value.h>

#include <drizzled/field/null.h>

namespace drizzled

{

bool Item_insert_value::eq(const Item *item, bool binary_cmp) const

{

  return item->type() == INSERT_VALUE_ITEM &&

    ((Item_default_value *)item)->arg->eq(arg, binary_cmp);

}

bool Item_insert_value::fix_fields(Session *session, Item **)

{

  assert(fixed == 0);

  /* We should only check that arg is in first table */

  if (!arg->fixed)

  {

    bool res;

    TableList *orig_next_table= context->last_name_resolution_table;

    context->last_name_resolution_table= context->first_name_resolution_table;

    res= arg->fix_fields(session, &arg);

    context->last_name_resolution_table= orig_next_table;

    if (res)

      return true;

  }

  if (arg->type() == REF_ITEM)

  {

    Item_ref *ref= (Item_ref *)arg;

    if (ref->ref[0]->type() != FIELD_ITEM)

    {

      my_error(ER_BAD_FIELD_ERROR, MYF(0), "", "VALUES() function");

      return true;

    }

    arg= ref->ref[0];

  }

  /*

    According to our SQL grammar, VALUES() function can reference

    only to a column.

  */

  assert(arg->type() == FIELD_ITEM);

  Item_field *field_arg= (Item_field *)arg;

  if (field_arg->field->getTable()->insert_values.size())

  {

    Field *def_field= (Field*) memory::sql_alloc(field_arg->field->size_of());

    if (!def_field)

      return true;

    memcpy(def_field, field_arg->field, field_arg->field->size_of());

    def_field->move_field_offset((ptrdiff_t)

                                 (&def_field->getTable()->insert_values[0] - def_field->getTable()->record[0]));

    set_field(def_field);

  }

  else

  {

    Field *tmp_field= field_arg->field;

    /* charset doesn't matter here, it's to avoid sigsegv only */

    tmp_field= new Field_null(0, 0, field_arg->field->field_name, &my_charset_bin);

    if (tmp_field)

    {

      tmp_field->init(field_arg->field->getTable());

      set_field(tmp_field);

    }

  }

  return false;

}

void Item_insert_value::print(String *str, enum_query_type query_type)

{

  str->append(STRING_WITH_LEN("values("));

  arg->print(str, query_type);

  str->append(')');

}

} /* namespace drizzled */