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rocksdb/examples/simple_example.c

50 lines
1.4 KiB

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "rocksdb/c.h"
#include <unistd.h> // sysconf() - get CPU count
const char DBPath[] = "/tmp/rocksdb_simple_example";
int main(int argc, char **argv) {
rocksdb_t *db;
rocksdb_options_t *options = rocksdb_options_create();
// Optimize RocksDB. This is the easiest way to
// get RocksDB to perform well
int cpus = sysconf(_SC_NPROCESSORS_ONLN); // get # of online cores
rocksdb_options_increase_parallelism(options, cpus);
rocksdb_options_optimize_level_style_compaction(options, 0);
// create the DB if it's not already present
rocksdb_options_set_create_if_missing(options, 1);
// open DB
char *err = NULL;
db = rocksdb_open(options, DBPath, &err);
assert(!err);
// Put key-value
rocksdb_writeoptions_t *writeoptions = rocksdb_writeoptions_create();
const char key[] = "key";
char *value = "value";
rocksdb_put(db, writeoptions, key, strlen (key), value, \
strlen (value), &err);
assert(!err);
// Get value
rocksdb_readoptions_t *readoptions = rocksdb_readoptions_create();
size_t len;
value = rocksdb_get(db, readoptions, key, strlen (key), &len, &err);
assert(!err);
assert(strcmp(value, "value") == 0);
free(value);
// cleanup
rocksdb_writeoptions_destroy(writeoptions);
rocksdb_readoptions_destroy(readoptions);
rocksdb_options_destroy(options);
rocksdb_close(db);
return 0;
}