nes-proj/examples/antelope/shell/shell-db.c

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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
* A small command-line interface for the database system.
* \author
* Nicolas Tsiftes <nvt@sics.se>
*/
#include <stdio.h>
#include "contiki.h"
#include "dev/serial-line.h"
#include "antelope.h"
PROCESS(db_shell, "DB shell");
AUTOSTART_PROCESSES(&db_shell);
PROCESS_THREAD(db_shell, ev, data)
{
static db_handle_t handle;
db_result_t result;
static tuple_id_t matching;
static tuple_id_t processed;
PROCESS_BEGIN();
db_init();
for(;;) {
PROCESS_WAIT_EVENT_UNTIL(ev == serial_line_event_message && data != NULL);
result = db_query(&handle, data);
if(DB_ERROR(result)) {
printf("Query \"%s\" failed: %s\n",
(char *)data, db_get_result_message(result));
db_free(&handle);
continue;
}
if(!db_processing(&handle)) {
printf("OK\n");
continue;
}
db_print_header(&handle);
matching = 0;
processed = 0;
while(db_processing(&handle)) {
PROCESS_PAUSE();
result = db_process(&handle);
switch(result) {
case DB_GOT_ROW:
/* The processed tuple matched the condition in the query. */
matching++;
processed++;
db_print_tuple(&handle);
break;
case DB_OK:
/* A tuple was processed, but did not match the condition. */
processed++;
continue;
case DB_FINISHED:
/* The processing has finished. Wait for a new command. */
printf("[%ld tuples returned; %ld tuples processed]\n",
(long)matching, (long)processed);
printf("OK\n");
default:
if(DB_ERROR(result)) {
printf("Processing error: %s\n", db_get_result_message(result));
}
db_free(&handle);
break;
}
}
}
PROCESS_END();
}