示例#1
0
文件: leveldb.go 项目: reusee/obox
func (self *Leveldb) Iter(fun func(string, Getter) bool) {
	iterator := C.leveldb_create_iterator(self.cdb, self.read_options)
	defer C.leveldb_iter_destroy(iterator)
	var keyLen C.size_t
	var keyValue *C.char
	var valueLen C.size_t
	var valueValue *C.char
	var ret bool
	for C.leveldb_iter_seek_to_first(iterator); C.leveldb_iter_valid(iterator) != levelFalse; C.leveldb_iter_next(iterator) {
		keyValue = C.leveldb_iter_key(iterator, &keyLen)
		key := string(C.GoBytes(unsafe.Pointer(keyValue), C.int(keyLen)))
		valueValue = C.leveldb_iter_value(iterator, &valueLen)
		value := C.GoBytes(unsafe.Pointer(valueValue), C.int(valueLen))
		r := bytes.NewReader(value)
		ret = fun(key, func(e interface{}) error {
			return decode(r, e)
		})
		if ret == false {
			break
		}
	}
}
示例#2
0
// SeekToFirst moves the iterator to the first key in the database, as defined
// by the Comparator in the ReadOptions used to create this Iterator.
//
// This method is safe to call when Valid returns false.
func (it *Iterator) SeekToFirst() {
	C.leveldb_iter_seek_to_first(it.Iter)
}