@Permission("RocksDB")
@Description("这是个使用RocksDB的参考代码")
contract RocksDBSample{
  function onCreate(){
    Global.rocksdb = RocksDBUtil.loadDB("./dbdir/","false");
  }
  @Description("示例参数: {\"key\":\"abc\",\"value\":\"def\"}")
  export function put(arg){
    arg = JSON.parse(arg);
    Global.rocksdb.put(arg.key,arg.value);
    return "success";
  }
  @Description("示例参数: \"abc\"}")
  export function get(arg){
  
    return Global.rocksdb.get(arg);
   
    return "failed";
  }
  
  @Description("示例参数: \"abc\"")
  export function deleteKey(arg){
    return Global.rocksdb.delete(arg);
  }
  @Description("遍历KV库，无需参数")
  export function iter(arg){
    var iter = Global.rocksdb.newIterator();
    var obj = undefined;
  
    var ret = {
    };
    for (iter.seekToFirst();(obj=Global.rocksdb.getNext(iter))!=undefined;){
      ret[obj.key]=obj.value;
    }
    return JSON.stringify(ret)
  }
}