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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, 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*/
/* The old structures from unireg */
#ifndef DRIZZLED_STRUCTS_H
#define DRIZZLED_STRUCTS_H
#include "drizzled/base.h"
#include "drizzled/definitions.h"
#include "drizzled/lex_string.h"
#include "drizzled/thr_lock.h"
namespace drizzled
{
namespace internal
{
typedef struct st_io_cache IO_CACHE;
}
class Table;
class Field;
class KeyPartInfo
{ /* Info about a key part */
public:
Field *field;
unsigned int offset; /* offset in record (from 0) */
unsigned int null_offset; /* Offset to null_bit in record */
/* Length of key part in bytes, excluding NULL flag and length bytes */
uint16_t length;
/*
Number of bytes required to store the keypart value. This may be
different from the "length" field as it also counts
- possible NULL-flag byte (see HA_KEY_NULL_LENGTH) [if null_bit != 0,
the first byte stored at offset is 1 if null, 0 if non-null; the
actual value is stored from offset+1].
- possible HA_KEY_BLOB_LENGTH bytes needed to store actual value length.
*/
uint16_t store_length;
uint16_t key_type;
private:
public:
uint16_t getKeyType() const
{
return key_type;
}
uint16_t fieldnr; /* Fieldnum in UNIREG (1,2,3,...) */
uint16_t key_part_flag; /* 0 or HA_REVERSE_SORT */
uint8_t type;
uint8_t null_bit; /* Position to null_bit */
};
class KeyInfo
{
public:
unsigned int key_length; /* Tot length of key */
enum ha_key_alg algorithm;
unsigned long flags; /* dupp key and pack flags */
unsigned int key_parts; /* How many key_parts */
uint32_t extra_length;
unsigned int usable_key_parts; /* Should normally be = key_parts */
uint32_t block_size;
KeyPartInfo *key_part;
char *name; /* Name of key */
/*
Array of AVG(#records with the same field value) for 1st ... Nth key part.
0 means 'not known'.
For temporary heap tables this member is NULL.
*/
ulong *rec_per_key;
Table *table;
LEX_STRING comment;
};
class JoinTable;
class RegInfo
{
public: /* Extra info about reg */
JoinTable *join_tab; /* Used by SELECT() */
enum thr_lock_type lock_type; /* How database is used */
bool not_exists_optimize;
bool impossible_range;
RegInfo()
: join_tab(NULL), lock_type(TL_UNLOCK),
not_exists_optimize(false), impossible_range(false) {}
void reset()
{
join_tab= NULL;
lock_type= TL_UNLOCK;
not_exists_optimize= false;
impossible_range= false;
}
};
class Session;
class Cursor;
namespace optimizer { class SqlSelect; }
typedef int *(*update_var)(Session *, struct drizzle_show_var *);
} /* namespace drizzled */
/* Bits in form->status */
#define STATUS_NO_RECORD (1+2) /* Record isn't usably */
#define STATUS_GARBAGE 1
#define STATUS_NOT_FOUND 2 /* No record in database when needed */
#define STATUS_NO_PARENT 4 /* Parent record wasn't found */
#define STATUS_NOT_READ 8 /* Record isn't read */
#define STATUS_UPDATED 16 /* Record is updated by formula */
#define STATUS_NULL_ROW 32 /* table->null_row is set */
#define STATUS_DELETED 64
#endif /* DRIZZLED_STRUCTS_H */
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