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drizzled/item/ident.cc
 
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 
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 *
 
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 *  Copyright (C) 2008 Sun Microsystems
 
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 *
 
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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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 *
 
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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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 *
 
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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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
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 */
 
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#include <drizzled/server_includes.h>
 
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#include CSTDINT_H
 
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#include <drizzled/show.h>
 
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#include <drizzled/table.h>
 
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#include <drizzled/current_session.h>
 
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#include <drizzled/item/ident.h>
 
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using namespace std;
 
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const uint32_t NO_CACHED_FIELD_INDEX= UINT32_MAX;
 
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Item_ident::Item_ident(Name_resolution_context *context_arg,
 
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                       const char *db_name_arg,const char *table_name_arg,
 
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                       const char *field_name_arg)
 
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  :orig_db_name(db_name_arg), orig_table_name(table_name_arg),
 
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   orig_field_name(field_name_arg), context(context_arg),
 
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   db_name(db_name_arg), table_name(table_name_arg),
 
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   field_name(field_name_arg),
 
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   alias_name_used(false), cached_field_index(NO_CACHED_FIELD_INDEX),
 
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   cached_table(0), depended_from(0)
 
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{
 
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  name = (char*) field_name_arg;
 
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}
 
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/**
 
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  Constructor used by Item_field & Item_*_ref (see Item comment)
 
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*/
 
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Item_ident::Item_ident(Session *session, Item_ident *item)
 
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  :Item(session, item),
 
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   orig_db_name(item->orig_db_name),
 
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   orig_table_name(item->orig_table_name),
 
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   orig_field_name(item->orig_field_name),
 
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   context(item->context),
 
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   db_name(item->db_name),
 
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   table_name(item->table_name),
 
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   field_name(item->field_name),
 
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   alias_name_used(item->alias_name_used),
 
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   cached_field_index(item->cached_field_index),
 
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   cached_table(item->cached_table),
 
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   depended_from(item->depended_from)
 
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{}
 
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void Item_ident::cleanup()
 
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{
 
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#ifdef CANT_BE_USED_AS_MEMORY_IS_FREED
 
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                       db_name ? db_name : "(null)",
 
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                       orig_db_name ? orig_db_name : "(null)",
 
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                       table_name ? table_name : "(null)",
 
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                       orig_table_name ? orig_table_name : "(null)",
 
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                       field_name ? field_name : "(null)",
 
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                       orig_field_name ? orig_field_name : "(null)"));
 
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#endif
 
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  Item::cleanup();
 
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  db_name= orig_db_name;
 
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  table_name= orig_table_name;
 
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  field_name= orig_field_name;
 
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  depended_from= 0;
 
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  return;
 
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}
 
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bool Item_ident::remove_dependence_processor(unsigned char * arg)
 
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{
 
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  if (depended_from == (Select_Lex *) arg)
 
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    depended_from= 0;
 
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  return(0);
 
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}
 
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const char *Item_ident::full_name() const
 
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{
 
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  char *tmp;
 
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  if (!table_name || !field_name)
 
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    return field_name ? field_name : name ? name : "tmp_field";
 
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  if (db_name && db_name[0])
 
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  {
 
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    tmp=(char*) sql_alloc((uint32_t) strlen(db_name)+(uint32_t) strlen(table_name)+
 
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                          (uint32_t) strlen(field_name)+3);
 
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    sprintf(tmp,"%s.%s.%s",db_name,table_name,field_name);
 
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  }
 
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  else
 
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  {
 
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    if (table_name[0])
 
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    {
 
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      tmp= (char*) sql_alloc((uint32_t) strlen(table_name) +
 
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                             (uint32_t) strlen(field_name) + 2);
 
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      sprintf(tmp, "%s.%s", table_name, field_name);
 
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    }
 
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    else
 
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      tmp= (char*) field_name;
 
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  }
 
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  return tmp;
 
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}
 
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void Item_ident::print(String *str,
 
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                       enum_query_type)
 
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{
 
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  string d_name, t_name;
 
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  if (table_name && table_name[0])
 
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  {
 
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    t_name.assign(table_name);
 
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    std::transform(t_name.begin(), t_name.end(),
 
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                   t_name.begin(), ::tolower);
 
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  }
 
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  if (db_name && db_name[0])
 
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  {
 
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    d_name.assign(db_name);
 
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    // Keeping the std:: prefix here, since Item_ident has a transform
 
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    // method
 
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      std::transform(d_name.begin(), d_name.end(),
 
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                     d_name.begin(), ::tolower);
 
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  }
 
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  if (!table_name || !field_name || !field_name[0])
 
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  {
 
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    const char *nm= (field_name && field_name[0]) ?
 
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                      field_name : name ? name : "tmp_field";
 
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    str->append_identifier(nm, (uint32_t) strlen(nm));
 
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    return;
 
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  }
 
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  if (db_name && db_name[0] && !alias_name_used)
 
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  {
 
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    {
 
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      str->append_identifier(d_name.c_str(), d_name.length());
 
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      str->append('.');
 
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    }
 
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    str->append_identifier(t_name.c_str(), t_name.length());
 
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    str->append('.');
 
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    str->append_identifier(field_name, (uint32_t)strlen(field_name));
 
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  }
 
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  else
 
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  {
 
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    if (table_name[0])
 
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    {
 
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      str->append_identifier(t_name.c_str(), t_name.length());
 
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      str->append('.');
 
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      str->append_identifier(field_name, (uint32_t) strlen(field_name));
 
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    }
 
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    else
 
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      str->append_identifier(field_name, (uint32_t) strlen(field_name));
 
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  }
 
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}
 
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double Item_ident_for_show::val_real()
 
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{
 
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  return field->val_real();
 
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}
 
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int64_t Item_ident_for_show::val_int()
 
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{
 
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  return field->val_int();
 
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}
 
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String *Item_ident_for_show::val_str(String *str)
 
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{
 
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  return field->val_str(str);
 
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}
 
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my_decimal *Item_ident_for_show::val_decimal(my_decimal *dec)
 
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{
 
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  return field->val_decimal(dec);
 
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}
 
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void Item_ident_for_show::make_field(SendField *tmp_field)
 
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{
 
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  tmp_field->table_name= tmp_field->org_table_name= table_name;
 
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  tmp_field->db_name= db_name;
 
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  tmp_field->col_name= tmp_field->org_col_name= field->field_name;
 
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  tmp_field->charsetnr= field->charset()->number;
 
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  tmp_field->length=field->field_length;
 
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  tmp_field->type=field->type();
 
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  tmp_field->flags= field->table->maybe_null ?
 
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    (field->flags & ~NOT_NULL_FLAG) : field->flags;
 
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  tmp_field->decimals= field->decimals();
 
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}
 
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