用mysql++读写二进制

方法1：

　　

// mysqlTest.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <mysql++.h>
#include <ssqls.h>
#include <sstream>

sql_create_2(test,
    , ,
    mysqlpp::sql_int, id,
    mysqlpp::sql_blob_null, value)

struct SCurScoutList
{
    struct SScoutInList
    {
        SScoutInList():
        m_nScoutID(),
        m_bSigned()
        {}

        int        m_nScoutID;
        byte    m_bSigned;
    };

    SCurScoutList()
    {}

    SScoutInList    m_scoutList[];
};

int main()
{
    SCurScoutList mylist;
    SCurScoutList mylist1;

    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_bSigned = ;

    try
    {
        mysqlpp::Connection conn(true);
        const std::string db="game";

        if (!conn.connect(db.c_str(), "127.0.0.1", "xt", ""))
        {
            return ;
        }

        mysqlpp::Query query = conn.query();
        query << "select * from test where id = 1";
        query.parse();
        mysqlpp::StoreQueryResult res = query.store();
        test myblob1 = res[];
        memcpy(&mylist1, myblob1.value.data, myblob1.value.data.length());

        test myblob2 = myblob1;
        myblob2.value.data.assign((const char*)&mylist, sizeof(mylist));
        query.update(myblob1, myblob2);
        query.execute();
    }
    catch(const mysqlpp::Exception& er)
    {
        std::cout << er.what() << std::endl;
    }

    getchar();
    return ;
}

方法2：

　　这个方法在debug下会有断言

　　

#include "stdafx.h"
#include <mysql++.h>
#include <ssqls.h>
#include <sstream>

sql_create_2(test,
    , ,
    mysqlpp::sql_int, id,
    mysqlpp::sql_blob_null, value)

struct SCurScoutList
{
    struct SScoutInList
    {
        SScoutInList():
    m_nScoutID(),
        m_bSigned()
    {}

    int        m_nScoutID;
    byte    m_bSigned;
    };

    SCurScoutList()
    {}

    SScoutInList    m_scoutList[];
};

int main()
{
    SCurScoutList mylist;
    SCurScoutList mylist1;

    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_nScoutID = ;
    mylist.m_scoutList[].m_bSigned = ;

    std::string strData;
    strData.assign(reinterpret_cast<const char*>(&mylist), sizeof(mylist));

    char szbuffer[] = {};
    memcpy(szbuffer, (const char*)&mylist, sizeof(mylist));

    try
    {
        mysqlpp::Connection conn(true);
        const std::string db="game";

        if (!conn.connect(db.c_str(), "127.0.0.1", "xt", ""))
        {
            return ;
        }

        mysqlpp::Query query = conn.query();
        query << "update test set value = \"" << mysqlpp::escape << strData << "\" where id = " << ;
        query.parse();
        query.execute();

        query.reset();
        query << "Select id, value from test where id=1";
        query.parse();
        mysqlpp::StoreQueryResult res = query.store();
        int nRowNum = res.num_rows();
        mysqlpp::sql_blob_null blobScoutList = res[]["value"];
        int nBlobLen = blobScoutList.data.length();
        int nsizeof = sizeof(SCurScoutList);
        if(nBlobLen == sizeof(SCurScoutList))
        {
            memcpy(&mylist1, blobScoutList.data.data(), nBlobLen);
        }
    }
    catch(const mysqlpp::Exception& er)
    {
        std::cout << er.what() << std::endl;
    }

    getchar();
    return ;
}