nes-proj/os/storage/antelope/result.h

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/*
* Copyright (c) 2010, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/**
* \file
* Declarations for the result acquisition API.
* \author
* Nicolas Tsiftes <nvt@sics.se>
*/
#ifndef RESULT_H
#define RESULT_H
#include "index.h"
#include "relation.h"
#include "storage.h"
#define RESULT_TUPLE_INVALID(tuple) ((tuple) == NULL)
#define RESULT_TUPLE_SIZE(handle) (handle).rel->row_length
typedef unsigned char *tuple_t;
#define DB_HANDLE_FLAG_INDEX_STEP 0x01
#define DB_HANDLE_FLAG_SEARCH_INDEX 0x02
#define DB_HANDLE_FLAG_PROCESSING 0x04
struct db_handle {
index_iterator_t index_iterator;
tuple_id_t tuple_id;
tuple_id_t current_row;
relation_t *rel;
relation_t *left_rel;
relation_t *join_rel;
relation_t *right_rel;
relation_t *result_rel;
attribute_t *left_join_attr;
attribute_t *right_join_attr;
tuple_t tuple;
uint8_t flags;
uint8_t ncolumns;
void *adt;
};
typedef struct db_handle db_handle_t;
db_result_t db_get_value(attribute_value_t *value,
db_handle_t *handle, unsigned col);
db_result_t db_phy_to_value(attribute_value_t *value,
attribute_t *attr, unsigned char *ptr);
db_result_t db_value_to_phy(unsigned char *ptr,
attribute_t *attr, attribute_value_t *value);
long db_value_to_long(attribute_value_t *value);
db_result_t db_free(db_handle_t *handle);
#endif /* !RESULT_H */