sqlite中文乱码有关问题解决方案

在VC++中通过sqlite3.dll接口对sqlite数据库进行操作，包括打开数据库，插入，查询数据库等，如果操作接口输入参数包含中文字符，会导致操作异常。例如调用sqlite3_open打开数据库文件，如果文件路径出现中文，就会导致打开失败。sqlite3_exec执行sql语句，如果包含中文对应字符就会变成乱码。这是由于sqlite数据库使用的是UTF-8编码方式，而传入的字符串是ASCII编码或Unicode编码，导致字符串格式错误。解决方案是在调用sqlite接口之前，先将字符串转换成UTF-8编码，以下提供各种字符串编码转换函数。

//UTF-8转Unicodestd::wstring Utf82Unicode(const std::string& utf8string){	int widesize = ::MultiByteToWideChar(CP_UTF8, 0, utf8string.c_str(), -1, NULL, 0);	if (widesize == ERROR_NO_UNICODE_TRANSLATION)	{		throw std::exception("Invalid UTF-8 sequence.");	}	if (widesize == 0)	{		throw std::exception("Error in conversion.");	}	std::vector<wchar_t> resultstring(widesize);	int convresult = ::MultiByteToWideChar(CP_UTF8, 0, utf8string.c_str(), -1, &resultstring[0], widesize);	if (convresult != widesize)	{		throw std::exception("La falla!");	}	return std::wstring(&resultstring[0]);}//unicode 转为 asciistring WideByte2Acsi(wstring& wstrcode){	int asciisize = ::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, NULL, 0, NULL, NULL);	if (asciisize == ERROR_NO_UNICODE_TRANSLATION)	{		throw std::exception("Invalid UTF-8 sequence.");	}	if (asciisize == 0)	{		throw std::exception("Error in conversion.");	}	std::vector<char> resultstring(asciisize);	int convresult =::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, &resultstring[0], asciisize, NULL, NULL);	if (convresult != asciisize)	{		throw std::exception("La falla!");	}	return std::string(&resultstring[0]);}//utf-8 转 asciistring UTF_82ASCII(string& strUtf8Code){	string strRet("");	//先把 utf8 转为 unicode 	wstring wstr = Utf82Unicode(strUtf8Code);	//最后把 unicode 转为 ascii	strRet = WideByte2Acsi(wstr);	return strRet;}/////////////////////////////////////////////////////////////////////////ascii 转 Unicodewstring Acsi2WideByte(string& strascii){	int widesize = MultiByteToWideChar (CP_ACP, 0, (char*)strascii.c_str(), -1, NULL, 0);	if (widesize == ERROR_NO_UNICODE_TRANSLATION)	{		throw std::exception("Invalid UTF-8 sequence.");	}	if (widesize == 0)	{		throw std::exception("Error in conversion.");	}	std::vector<wchar_t> resultstring(widesize);	int convresult = MultiByteToWideChar (CP_ACP, 0, (char*)strascii.c_str(), -1, &resultstring[0], widesize);	if (convresult != widesize)	{		throw std::exception("La falla!");	}	return std::wstring(&resultstring[0]);}//Unicode 转 Utf8std::string Unicode2Utf8(const std::wstring& widestring){	int utf8size = ::WideCharToMultiByte(CP_UTF8, 0, widestring.c_str(), -1, NULL, 0, NULL, NULL);	if (utf8size == 0)	{		throw std::exception("Error in conversion.");	}	std::vector<char> resultstring(utf8size);	int convresult = ::WideCharToMultiByte(CP_UTF8, 0, widestring.c_str(), -1, &resultstring[0], utf8size, NULL, NULL);	if (convresult != utf8size)	{		throw std::exception("La falla!");	}	return std::string(&resultstring[0]);}//ascii 转 Utf8string ASCII2UTF_8(string& strAsciiCode){	string strRet("");	//先把 ascii 转为 unicode 	wstring wstr = Acsi2WideByte(strAsciiCode);	//最后把 unicode 转为 utf8	strRet = Unicode2Utf8(wstr);	return strRet;}

1楼wangeen昨天 10:27

我们当时是用base64压缩一下送进去的 这样子sqlite甚至还可以保存图片之类的东西