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63 lines
2.0 KiB
63 lines
2.0 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef STORAGE_LEVELDB_INCLUDE_FIELDS_H_
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#define STORAGE_LEVELDB_INCLUDE_FIELDS_H_
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#include <string>
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#include "db/dbformat.h"
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#include "leveldb/fields.h"
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namespace leveldb {
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std::string SerializeValue(const FieldArray& fields){
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std::string res_="";
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PutVarint64(&res_,(uint64_t)fields.size());
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for(auto pr:fields){
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PutLengthPrefixedSlice(&res_, pr.first);
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PutLengthPrefixedSlice(&res_, pr.second);
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}
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return res_;
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}
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void DeserializeValue(const std::string& value_str,FieldArray* res){
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Slice slice=Slice(value_str.c_str());
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uint64_t siz;
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bool tmpres=GetVarint64(&slice,&siz);
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assert(tmpres);
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res->clear();
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for(int i=0;i<siz;i++){
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Slice value_name;
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Slice value;
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tmpres=GetLengthPrefixedSlice(&slice,&value_name);
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assert(tmpres);
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tmpres=GetLengthPrefixedSlice(&slice,&value);
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assert(tmpres);
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res->emplace_back(value_name,value);
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}
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}
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Status Get_keys_by_field(DB *db,const ReadOptions& options, const Field field,std::vector<std::string> *keys){
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auto it=db->NewUnorderedIterator(options,Slice(),Slice());
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keys->clear();
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while(it->Valid()){
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auto val=it->value();
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FieldArray arr;
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auto str_val=std::string(val.data(),val.size());
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DeserializeValue(str_val,&arr);
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for(auto pr:arr){
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if(pr.first==field.first&&pr.second==field.second){
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Slice key=it->key();
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keys->push_back(std::string(key.data(),key.size()));
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break;
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}
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}
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it->Next();
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}
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delete it;
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return Status::OK();
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}
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}
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#endif // STORAGE_LEVELDB_INCLUDE_FIELDS_H_
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