NoSQL的CURD结构体的定义

NoSQL的CURD结构体的定义

flyfish 2015-7-23

參考MongoDB Wire Protocol 

在这里document部分使用json表示 使用boost::property_tree解析

#pragma once
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

struct MsgHeader
{
	int   messageLength;
	int   requestID;
	int   responseTo;
	int   opCode;
};

//操作类型 主要是增删改查
enum Operations
{
	dbUpdate = 2001,
	dbInsert = 2002,
	dbQuery  = 2003,
	dbDelete = 2004

};

 const char * opToString( int op ) {
	switch ( op ) {
	case 0: return "none";

	case dbUpdate: return "update";
	case dbInsert: return "insert";
	case dbQuery:  return "query";
	case dbDelete: return "remove";

	default:
		// 输出异常信息 cannot translate opcode
		return "";
	}
}

typedef boost::property_tree::ptree  ObjectNotation;
struct OP_UPDATE
{
	MsgHeader       header;
	int             ZERO;
	string          ObjectName;
	int             flags;
	ObjectNotation  selector;
	ObjectNotation  update;
};

//selector  {ID:1}
//update {key1:"value1",key2:"value2"}
//相当于SQL UPDATE ObjectName SET key1=value1,key2=value2 WHERE ID=1

struct OP_INSERT
{
	MsgHeader       header;
	int             flags;
	string          ObjectName;
	ObjectNotation* ObjectNotations;
};
//ObjectNotations { ID:1, key1:value1, key2:value2 }
//相当于SQL INSERT INTO ObjectName(ID,key1,key2)VALUES (1,value1,value2)

struct OP_QUERY
{
	MsgHeader header;
	int       flags;
	string    ObjectName ;
	int       numberToSkip;
	int       numberToReturn;        

	ObjectNotation  query;
	ObjectNotation  returnFieldsSelector;  

};

//query { ID: "1 },
//returnFieldsSelector { ID: 1, Name: 1}
//相当于SQL SELECT ID, Name FROM ObjectName WHERE ID=1

struct OP_DELETE
{
	MsgHeader header;
	int     ZERO;
	string    ObjectName ;
	int     flags;
	ObjectNotation  selector;
};
//selector { ID: "1" }
//相当于SQL DELETE FROM ObjectName WHERE ID = 1