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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008-2009 Sun Microsystems, Inc.
*
* 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
*/
#pragma once
#include <drizzled/field.h>
namespace drizzled
{
class Item;
typedef struct st_typelib TYPELIB;
/**
* Class representing a field in a CREATE TABLE statement.
*
* Basically, all information for a new or altered field
* definition is contained in the Create_field class.
*/
class CreateField :public memory::SqlAlloc
{
public:
const char *field_name; /**< Name of the field to be created */
const char *change; /**< If done with alter table */
const char *after; /**< Put this new Field after this Field */
LEX_STRING comment; /**< A comment for this field */
Item *def; /**< Default value for the new field */
enum enum_field_types sql_type; /**< The data type of the new field */
enum_field_types type() const
{
return sql_type;
}
/**
* At various stages in execution this can be length of field in bytes or
* max number of characters.
*/
uint32_t length;
/**
* The value of `length' as set by parser: is the number of characters
* for most of the types, or of bytes for BLOBs or numeric types.
*/
uint32_t char_length;
uint32_t decimals;
uint32_t flags;
uint32_t pack_length;
uint32_t key_length;
Field::utype unireg_check; /**< See Field::unireg_check */
TYPELIB *interval; /**< Which interval to use (ENUM types..) */
List<String> interval_list;
const CHARSET_INFO *charset; /**< Character set for the column -- @TODO should be deleted */
Field *field; // For alter table
uint8_t interval_id; // For rea_create_table
uint32_t offset;
CreateField() :after(0) {}
CreateField(Field *field, Field *orig_field);
/* Used to make a clone of this object for ALTER/CREATE TABLE */
CreateField *clone(memory::Root *mem_root) const
{ return new (mem_root) CreateField(*this); }
void create_length_to_internal_length(void);
inline enum column_format_type column_format() const
{
return (enum column_format_type)
((flags >> COLUMN_FORMAT_FLAGS) & COLUMN_FORMAT_MASK);
}
/**
* Init for a tmp table field. To be extended if need be.
*
* @note This is currently ONLY used in Item_sum_distinct::setup()
*/
void init_for_tmp_table(enum_field_types sql_type_arg,
uint32_t max_length,
uint32_t decimals,
bool maybe_null);
/**
Initialize field definition for create.
@param session Thread handle
@param fld_name Field name
@param fld_type Field type
@param fld_length Field length
@param fld_decimals Decimal (if any)
@param fld_type_modifier Additional type information
@param fld_default_value Field default value (if any)
@param fld_on_update_value The value of ON UPDATE clause
@param fld_comment Field comment
@param fld_change Field change
@param fld_interval_list Interval list (if any)
@param fld_charset Field charset
@retval
false on success
@retval
true on error
*/
bool init(Session *session,
char *field_name,
enum_field_types type,
char *length,
char *decimals,
uint32_t type_modifier,
Item *default_value,
Item *on_update_value,
LEX_STRING *comment,
char *change,
List<String> *interval_list,
const CHARSET_INFO * const cs,
uint32_t uint_geom_type,
enum column_format_type column_format);
};
std::ostream& operator<<(std::ostream& output, const CreateField &field);
} /* namespace drizzled */
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