newDB

db/NewDB.cc

@@ -0,0 +1,62 @@
+#include "db/NewDB.h"
+#include "util/coding.h"
+#include "db/write_batch_internal.h"
+#include "db/version_set.h"
+#include "db/db_impl.h"
+#include <string>
+#include <sstream>
+#include <unordered_map>
+#include <map>
+#include <iostream>
+#include <mutex>
+#include <thread>
+#include <ctime>
+#include <condition_variable>
+#include <unordered_set>
+
+namespace leveldb{
+NewDB::~NewDB() {
+
+}
+
+Status NewDB::Open(const Options& options, const std::string& name, NewDB** dbptr) {
+
+}
+
+
+Status NewDB::Put_fields(const WriteOptions& options, const Slice& key, const FieldArray& fields){
+
+}
+
+Status NewDB::Get_fields(const ReadOptions& options, const Slice& key, FieldArray* fields){
+
+}
+
+std::vector<std::string> NewDB::FindKeysByField(Field &field){  
+
+}
+
+bool NewDB::Delete(const WriteOptions& options, const Slice& key){  
+
+}
+
+
+
+bool NewDB::CreateIndexOnField(const std::string& field_name) {
+
+}
+
+std::vector<std::string> NewDB::QueryByIndex(Field &field){   
+
+}
+
+bool NewDB::DeleteIndex(const std::string& field_name){    
+
+}
+
+}
+
+
+
+
+

db/NewDB.h

@@ -0,0 +1,53 @@
+#ifndef NEWDB_H
+#define NEWDB_H
+
+#include <memory>
+#include <unordered_set>
+#include <mutex>
+#include <thread>
+#include "leveldb/db.h"
+#include "db/log_writer.h"
+
+namespace leveldb{
+
+class LEVELDB_EXPORT NewDB {
+  public:
+  NewDB() = default;
+
+  NewDB(const NewDB&) = delete;
+  NewDB& operator=(const NewDB&) = delete;
+
+  virtual ~NewDB();
+
+  static Status Open(const Options& options, const std::string& name,
+                      NewDB** dbptr);  // 改为返回 NewDB* 类型-橙
+
+  Status Put_fields(const WriteOptions& options, const Slice& key,
+                     const FieldArray& fields);
+
+  Status Get_fields(const ReadOptions& options, const Slice& key,   
+                     FieldArray* fields);
+
+  bool Delete(const WriteOptions& options, const Slice& key);
+
+  std::vector<std::string> FindKeysByField(Field &field);
+
+  bool CreateIndexOnField(const std::string& field_name);
+
+  std::vector<std::string> QueryByIndex(Field &field);
+
+  bool DeleteIndex(const std::string& field_name);
+  
+  // 用于存储已经为其创建索引的字段名称。只有当字段名在这个集合中时，才会在 indexDB 中插入对应的索引条目。
+  std::unordered_set<std::string> indexed_fields_read;
+  std::unordered_set<std::string> indexed_fields_write;
+
+  private:
+  std::unique_ptr<DB> data_db_;
+
+  std::unique_ptr<DB> index_db_;
+};
+
+}
+
+#endif