lmdb/libraries/libmdb/mtest4.c

/* mtest4.c - memory-mapped database tester/toy */
/*
 * Copyright 2011 Howard Chu, Symas Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

/* Tests for sorted duplicate DBs with fixed-size keys */
#define _XOPEN_SOURCE 500		/* srandom(), random() */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "mdb.h"

int main(int argc,char * argv[])
{
	int i = 0, j = 0, rc;
	MDB_env *env;
	MDB_dbi dbi;
	MDB_val key, data;
	MDB_txn *txn;
	MDB_stat mst;
	MDB_cursor *cursor;
	int count;
	int *values;
	char sval[8];
	char kval[sizeof(int)];

	memset(sval, 0, sizeof(sval));

	count = 510;
	values = (int *)malloc(count*sizeof(int));

	for(i = 0;i<count;i++) {
		values[i] = i*5;
	}

	rc = mdb_env_create(&env);
	rc = mdb_env_set_mapsize(env, 10485760);
	rc = mdb_env_set_maxdbs(env, 4);
	rc = mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664);
	rc = mdb_txn_begin(env, 0, &txn);
	rc = mdb_open(txn, "id2", MDB_CREATE|MDB_DUPSORT|MDB_DUPFIXED, &dbi);

	key.mv_size = sizeof(int);
	key.mv_data = kval;
	data.mv_size = sizeof(sval);
	data.mv_data = sval;

	printf("Adding %d values\n", count);
	strcpy(kval, "001");
	for (i=0;i<count;i++) {
		sprintf(sval, "%07x", values[i]);
		rc = mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA);
		if (rc) j++;
	}
	if (j) printf("%d duplicates skipped\n", j);
	rc = mdb_txn_commit(txn);
	rc = mdb_env_stat(env, &mst);

	/* there should be one full page of dups now.
	 */
	rc = mdb_txn_begin(env, 1, &txn);
	rc = mdb_cursor_open(txn, dbi, &cursor);
	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
		printf("key: %p %.*s, data: %p %.*s\n",
			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
	}
	mdb_cursor_close(cursor);
	mdb_txn_abort(txn);

	/* test all 3 branches of split code:
	 * 1: new key in lower half
	 * 2: new key at split point
	 * 3: new key in upper half
	 */

	key.mv_size = sizeof(int);
	key.mv_data = kval;
	data.mv_size = sizeof(sval);
	data.mv_data = sval;

	sprintf(sval, "%07x", values[3]+1);
	rc = mdb_txn_begin(env, 0, &txn);
	rc = mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA);
	mdb_txn_abort(txn);

	sprintf(sval, "%07x", values[255]+1);
	rc = mdb_txn_begin(env, 0, &txn);
	rc = mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA);
	mdb_txn_abort(txn);

	sprintf(sval, "%07x", values[500]+1);
	rc = mdb_txn_begin(env, 0, &txn);
	rc = mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA);
	rc = mdb_txn_commit(txn);

	/* Try MDB_NEXT_MULTIPLE */
	rc = mdb_txn_begin(env, 0, &txn);
	rc = mdb_cursor_open(txn, dbi, &cursor);
	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT_MULTIPLE)) == 0) {
		printf("key: %.*s, data: %.*s\n",
			(int) key.mv_size,  (char *) key.mv_data,
			(int) data.mv_size, (char *) data.mv_data);
	}
	mdb_cursor_close(cursor);
	mdb_txn_abort(txn);
	j=0;

	for (i= count - 1; i > -1; i-= (random()%3)) {
		j++;
		txn=NULL;
		rc = mdb_txn_begin(env, 0, &txn);
		sprintf(sval, "%07x", values[i]);
		key.mv_size = sizeof(int);
		key.mv_data = kval;
		data.mv_size = sizeof(sval);
		data.mv_data = sval;
		rc = mdb_del(txn, dbi, &key, &data);
		if (rc) {
			j--;
			mdb_txn_abort(txn);
		} else {
			rc = mdb_txn_commit(txn);
		}
	}
	free(values);
	printf("Deleted %d values\n", j);

	rc = mdb_env_stat(env, &mst);
	rc = mdb_txn_begin(env, 1, &txn);
	rc = mdb_cursor_open(txn, dbi, &cursor);
	printf("Cursor next\n");
	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
		printf("key: %.*s, data: %.*s\n",
			(int) key.mv_size,  (char *) key.mv_data,
			(int) data.mv_size, (char *) data.mv_data);
	}
	printf("Cursor prev\n");
	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
		printf("key: %.*s, data: %.*s\n",
			(int) key.mv_size,  (char *) key.mv_data,
			(int) data.mv_size, (char *) data.mv_data);
	}
	mdb_cursor_close(cursor);
	mdb_close(env, dbi);

	mdb_txn_abort(txn);
	mdb_env_close(env);

	return 0;
}