text: /* mtest2.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>.
   */
  
  /* Just like mtest.c, but using a subDB instead of the main DB */
  
  #define _XOPEN_SOURCE 500		/* srandom(), random() */
  #include <stdio.h>
  #include <stdlib.h>
  #include <time.h>
  #include "lmdb.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[32];
  
  	srandom(time(NULL));
  
  	count = (random()%384) + 64;
  	values = (int *)malloc(count*sizeof(int));
  
  	for(i = 0;i<count;i++) {
  		values[i] = random()%1024;
  	}
  
  	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, NULL, 0, &txn);
  	rc = mdb_open(txn, "id1", MDB_CREATE, &dbi);
     
  	key.mv_size = sizeof(int);
  	key.mv_data = sval;
  	data.mv_size = sizeof(sval);
  	data.mv_data = sval;
  
  	printf("Adding %d values\n", count);
  	for (i=0;i<count;i++) {	
  		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
  		rc = mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE);
  		if (rc) j++;
  	}
  	if (j) printf("%d duplicates skipped\n", j);
  	rc = mdb_txn_commit(txn);
  	rc = mdb_env_stat(env, &mst);
  
  	rc = mdb_txn_begin(env, NULL, 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);
  
  	j=0;
  	key.mv_data = sval;
  	for (i= count - 1; i > -1; i-= (random()%5)) {	
  		j++;
  		txn=NULL;
  		rc = mdb_txn_begin(env, NULL, 0, &txn);
  		sprintf(sval, "%03x ", values[i]);
  		rc = mdb_del(txn, dbi, &key, NULL);
  		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, NULL, 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;
  }
  