LevelDB *ldb = [LevelDB databaseInLibraryWithName:@"test.ldb"];

ldb.encoder = ^ NSData * (LevelDBKey *key, id object) {
  // return some data, given an object
}
ldb.decoder = ^ id (LevelDBKey *key, NSData * data) {
  // return an object, given some data
}

ldb[@"string_test"] = @"laval"; // same as:
[ldb setObject:@"laval" forKey:@"string_test"];

NSLog(@"String Value: %@", ldb[@"string_test"]); // same as:
NSLog(@"String Value: %@", [ldb objectForKey:@"string_test"]);

[ldb setObject:@{@"key1" : @"val1", @"key2" : @"val2"} forKey:@"dict_test"];
NSLog(@"Dictionary Value: %@", [ldb objectForKey:@"dict_test"]);

[ldb enumerateKeysAndObjectsUsingBlock:^(LevelDBKey *key, id value, BOOL *stop) {
    // This step is necessary since the key could be a string or raw data (use NSDataFromLevelDBKey in that case)
    NSString *keyString = NSStringFromLevelDBKey(key); // Assumes UTF-8 encoding
    // Do something clever
}];

// Enumerate with options
[ldb enumerateKeysAndObjectsBackward:TRUE
                              lazily:TRUE       // Block below will have a block(void) instead of id argument for value
                       startingAtKey:someKey    // Start iteration there (NSString or NSData)
                 filteredByPredicate:predicate  // Only iterate over values matching NSPredicate
                           andPrefix:prefix     // Only iterate over keys prefixed with something 
                          usingBlock:^(LevelDBKey *key, void(^valueGetter)(void), BOOL *stop) {

    NSString *keyString = NSStringFromLevelDBKey(key);

    // If we had wanted the value directly instead of a valueGetter block, we would've set the 
    // above 'lazily' argument to FALSE
    id value = valueGetter();
}]

LDBSnapshot *snap = [ldb newSnapshot]; // You get ownership of this variable, so in non-ARC projects,
                                       // you'll need to release/autorelease it eventually
[ldb removeObjectForKey:@"string_test"];

// The result of these calls will reflect the state of ldb when the snapshot was taken
NSLog(@"String Value: %@", [snap objectForKey:@"string_test"]);
NSLog(@"Dictionary Value: %@", [ldb objectForKey:@"dict_test"]);

LDBWritebatch *wb = [ldb newWritebatch];
[wb setObject:@{ @"foo" : @"bar" } forKey: @"another_test"];
[wb removeObjectForKey:@"dict_test"];

// Those changes aren't yet applied to ldb
// To apply them in batch, 
[wb apply];

// The following values are the default
LevelDBOptions options = [LevelDB makeOptions];
options.createIfMissing = true;
options.errorIfExists   = false;
options.paranoidCheck   = false;
options.compression     = true;
options.filterPolicy    = 0;      // Size in bits per key, allocated for a bloom filter, used in testing presence of key
options.cacheSize       = 0;      // Size in bytes, allocated for a LRU cache used for speeding up lookups

// Then, you can provide it when initializing a db instance.
LevelDB *ldb = [LevelDB databaseInLibraryWithName:@"test.ldb" andOptions:options];

db.safe = true; // Make sure to data was actually written to disk before returning from write operations.
[ldb setObject:@"laval" forKey:@"string_test"];
[ldb setObject:[NSDictionary dictionaryWithObjectsAndKeys:@"val1", @"key1", @"val2", @"key2", nil] forKey:@"dict_test"];
db.safe = false; // Switch back to default

db.useCache = false; // Do not use DB cache when reading data (default to true);