my-chat_-server/odb/message.hxx

#pragma once
#include <string>
#include <cstddef> 
#include <odb/nullable.hxx>
#include <odb/core.hxx>
#include <boost/date_time/posix_time/posix_time.hpp>

namespace bite_im {
#pragma db object table("message")
class Message {
    public:
        Message(){}
        Message(const std::string &mid,
            const std::string &ssid,
            const std::string &uid,
            const unsigned char mtype,
            const boost::posix_time::ptime &ctime):
            _message_id(mid), _session_id(ssid),
            _user_id(uid), _message_type(mtype),
            _create_time(ctime){}
        
        std::string message_id() const { return _message_id; }
        void message_id(const std::string &val) { _message_id = val; }

        std::string session_id() const { return _session_id; }
        void session_id(const std::string &val) { _session_id = val; }
        
        std::string user_id() const { return _user_id; }
        void user_id(const std::string &val) { _user_id = val; }
        
        unsigned char message_type() const { return _message_type; }
        void message_type(unsigned char val) { _message_type = val; }
        
        boost::posix_time::ptime create_time() const { return _create_time; }
        void create_time(const boost::posix_time::ptime &val) { _create_time = val; }

        std::string content() const { 
            if (!_content) return std::string();
            return *_content; 
        }
        void content(const std::string &val) { _content = val; }

        std::string file_id() const { 
            if (!_file_id) return std::string();
            return *_file_id; 
        }
        void file_id(const std::string &val) { _file_id = val; }
        
        std::string file_name() const { 
            if (!_file_name) return std::string();
            return *_file_name; 
        }
        void file_name(const std::string &val) { _file_name = val; }
        
        unsigned int file_size() const { 
            if (!_file_size) return 0;
            return *_file_size; 
        }
        void file_size(unsigned int val) { _file_size = val; }
    private:
        friend class odb::access;
        #pragma db id auto
        unsigned long _id;
        #pragma db type("varchar(64)") index unique
        std::string _message_id;
        #pragma db type("varchar(64)") index
        std::string _session_id;                //所属会话ID
        #pragma db type("varchar(64)")
        std::string _user_id;                   //发送者用户ID
        unsigned char _message_type;            //消息类型 0-文本；1-图片；2-文件；3-语音
        #pragma db type("TIMESTAMP")
        boost::posix_time::ptime _create_time;  //消息的产生时间

        //可空信息字段
        odb::nullable<std::string> _content;    //文本消息内容--非文本消息可以忽略
        #pragma db type("varchar(64)")
        odb::nullable<std::string> _file_id;    //文件消息的文件ID -- 文本消息忽略
        #pragma db type("varchar(128)")
        odb::nullable<std::string> _file_name;  //文件消息的文件名称 -- 只针对文件消息有效
        odb::nullable<unsigned int> _file_size; //文件消息的文件大小 -- 只针对文件消息有效
};
//odb -d mysql --std c++11 --generate-query --generate-schema --profile boost/date-time message.hxx
}