25개 이상의 토픽을 선택하실 수 없습니다.
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62 lines
2.0 KiB
62 lines
2.0 KiB
#pragma
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#include <iostream>
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#include "leveldb/db.h"
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#include <vector>
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#include <mutex>
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namespace leveldb {
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class LEVELDB_EXPORT MyLevelDB : leveldb::DB {
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public:
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MyLevelDB(Options& options, std::string db_name)
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: _op(options), _db_name(db_name) {
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//打开数据库
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Status status = DB::Open(options, db_name + "_main", &_fields_db);
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if (!status.ok()) {
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std::cerr << "Open main database failure: " << status.ToString() << std::endl;
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abort();
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}
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}
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//序列化为字符串
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void SerializeValue(const FieldArray& fields, std::string& resString);
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// 反序列化为字段数组
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void ParseValue(const std::string& value_str, FieldArray& resFieldArray);
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//字段存储
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Status PutWithFields(const WriteOptions& options, const std::string& key,const FieldArray& fields);
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//字段查找
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Status FindKeysByField(const ReadOptions& options, const Field field,std::vector<std::string>* keys);
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//创建索引
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Status CreateIndexOnField(const std::string& field_name);
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//删除索引
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Status DeleteIndex(std::string& field_name);
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void QueryByIndex(const ReadOptions& options, Field& field,
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std::vector<std::string>& keys);
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public:
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Status Put(const WriteOptions& options, const Slice& key,
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const Slice& value) override;
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Status Delete(const WriteOptions& options, const Slice& key) override;
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Status Write(const WriteOptions& options, WriteBatch* updates) override;
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Status Get(const ReadOptions& options, const Slice& key,
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std::string* value) override;
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Iterator* NewIterator(const ReadOptions& options) override;
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const Snapshot* GetSnapshot() override;
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void ReleaseSnapshot(const Snapshot* snapshot) override;
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bool GetProperty(const Slice& property, std::string* value) override;
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void GetApproximateSizes(const Range* range, int n, uint64_t* sizes) override;
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void CompactRange(const Slice* begin, const Slice* end) override;
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private:
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Options _op;
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std::string _db_name;
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DB* _fields_db;
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std::vector<std::string> index_list_;
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std::mutex mutex_;
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std::vector<DB*> index_db;
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};
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}
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