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40 lines
961 B
40 lines
961 B
#ifndef STORAGE_LEVELDB_FIELDS_H_
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#define STORAGE_LEVELDB_FIELDS_H_
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#include <map>
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#include <string>
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#include <vector>
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#include "leveldb/slice.h"
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namespace leveldb {
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using Field = std::pair<std::string, std::string>;
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using FieldArray = std::vector<std::pair<std::string, std::string>>;
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class Fields {
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public:
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// 从FieldArray构建Fields
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explicit Fields(const FieldArray& field_array);
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// 从LevelDB存储的Value中解码出Fields
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explicit Fields(const Slice& fields_str);
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Fields() = default;
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~Fields();
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// 重载[]运算符简便对字段的修改和访问操作
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std::string& operator[](const std::string& field_name);
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// 获取当前Fields对应的FieldArray
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FieldArray GetFieldArray() const;
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// 将Fields编码为存入LevelDB的Value
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std::string Serialize() const;
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private:
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std::map<std::string, std::string> _fields;
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};
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} // namespace leveldb
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#endif //STORAGE_LEVELDB_FIELDS_H_
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