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948775c Mar 31, 2016
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@cruppstahl @GerHobbelt
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/*
* Copyright (C) 2005-2016 Christoph Rupp (chris@crupp.de).
* All Rights Reserved.
*
* 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 3 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.
*
* See the file COPYING for License information.
*/
/**
* A simple example which creates a database, inserts some values,
* looks them up and erases them.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h> /* for exit() */
#include <ups/upscaledb.h>
#define LOOP 10
#define DATABASE_NAME 1
void
error(const char *foo, ups_status_t st) {
printf("%s() returned error %d: %s\n", foo, st, ups_strerror(st));
exit(-1);
}
int
main(int argc, char **argv) {
uint32_t i;
ups_status_t st; /* status variable */
ups_env_t *env; /* upscaledb environment object */
ups_db_t *db; /* upscaledb database object */
ups_key_t key = {0}; /* the structure for a key */
ups_record_t record = {0}; /* the structure for a record */
ups_parameter_t params[] = { /* parameters for ups_env_create_db */
{UPS_PARAM_KEY_TYPE, UPS_TYPE_UINT32},
{UPS_PARAM_RECORD_SIZE, sizeof(uint32_t)},
{0, }
};
/* First create a new upscaledb Environment */
st = ups_env_create(&env, "test.db", 0, 0664, 0);
if (st != UPS_SUCCESS)
error("ups_env_create", st);
/* And in this Environment we create a new Database for uint32-keys
* and uint32-records. */
st = ups_env_create_db(env, &db, DATABASE_NAME, 0, &params[0]);
if (st != UPS_SUCCESS)
error("ups_env_create_db", st);
/*
* now we can insert, delete or lookup values in the database
*
* for our test program, we just insert a few values, then look them
* up, then delete them and try to look them up again (which will fail).
*/
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
record.size = key.size;
record.data = key.data;
st = ups_db_insert(db, 0, &key, &record, 0);
if (st != UPS_SUCCESS)
error("ups_db_insert", st);
}
/*
* now lookup all values
*
* for ups_db_find(), we could use the flag UPS_RECORD_USER_ALLOC, if WE
* allocate record.data (otherwise the memory is automatically allocated
* by upscaledb)
*/
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
st = ups_db_find(db, 0, &key, &record, 0);
if (st != UPS_SUCCESS)
error("ups_db_find", st);
/*
* check if the value is ok
*/
if (*(int *)record.data != i) {
printf("ups_db_find() ok, but returned bad value\n");
return (-1);
}
}
/*
* close the database handle, then re-open it (to demonstrate how to open
* an Environment and a Database)
*/
st = ups_db_close(db, 0);
if (st != UPS_SUCCESS)
error("ups_db_close", st);
st = ups_env_close(env, 0);
if (st != UPS_SUCCESS)
error("ups_env_close", st);
st = ups_env_open(&env, "test.db", 0, 0);
if (st != UPS_SUCCESS)
error("ups_env_open", st);
st = ups_env_open_db(env, &db, DATABASE_NAME, 0, 0);
if (st != UPS_SUCCESS)
error("ups_env_open_db", st);
/* now erase all values */
for (i = 0; i < LOOP; i++) {
key.size = sizeof(i);
key.data = &i;
st = ups_db_erase(db, 0, &key, 0);
if (st != UPS_SUCCESS)
error("ups_db_erase", st);
}
/*
* once more we try to find all values... every ups_db_find() call must
* now fail with UPS_KEY_NOT_FOUND
*/
for (i = 0; i < LOOP; i++) {
key.size = sizeof(i);
key.data = &i;
st = ups_db_find(db, 0, &key, &record, 0);
if (st != UPS_KEY_NOT_FOUND)
error("ups_db_find", st);
}
/* we're done! close the handles. UPS_AUTO_CLEANUP will also close the
* 'db' handle */
st = ups_env_close(env, UPS_AUTO_CLEANUP);
if (st != UPS_SUCCESS)
error("ups_env_close", st);
printf("success!\n");
return (0);
}