mysql 一些问题

1.strlen()求的是字节长度
  _tcsclen（）求的是所看到的汉字以及字母个数
  例如：strlen("你好") == 4；
    _tcsclen("你好") == 2；

2.多字符集->unicode->utf8

 TCHAR* CTerAdd::Convert(CHAR* tmpSql)
{
  DWORD dwNum = MultiByteToWideChar (CP_ACP, 0, tmpSql, -1, NULL, 0);
  wchar_t *pwText;
  pwText = new wchar_t[dwNum];
 memset(pwText,0,dwNum);
  MultiByteToWideChar(CP_ACP,0,tmpSql,-1,pwText,dwNum);

  DWORD nLength   =   WideCharToMultiByte(CP_UTF8,0,pwText,-1,NULL,0,NULL,NULL);  
  TCHAR* buffer  = new TCHAR[nLength];
 memset(buffer,0,nLength);
  WideCharToMultiByte(CP_UTF8,0,pwText,-1,buffer,nLength,NULL,NULL); 

//  //delete [] buffer;
  delete [] pwText;
  return buffer;

}

3.mysql administrator

 程序里转换前代码：
  insert into terminal_info(ter_sn,tel_no,sim_no,gps_no,type,comm_type,setup_date,manufacturer) values('111','222','333','444','555','666','08-12-20 17:25:16','测试')
经过上面函数Convert（）转化，返回
   insert into terminal_info(ter_sn,tel_no,sim_no,gps_no,type,comm_type,setup_date,manufacturer) values('111','222','333','444','555','666','08-12-20 17:25:16','娴嬭瘯')
添加成功后在查看manufacturer字段为 ‘娴嬭瘯’
如果把插入语句insert into terminal_info(ter_sn,tel_no,sim_no,gps_no,type,comm_type,setup_date,manufacturer) values('111','222','333','444','555','666','08-12-20 17:25:16','娴嬭瘯')在cmd下面执行再administrator查看为“测试”如果执行前set
names gbk;再插入就则为'娴嬭瘯‘。

4.错误Data too long for column 'color' at row 1
  说明再clolor字段不符合要求，比如该字符集不能够满足要插入的字符，经查看，改color字段，latin1 为utf8，OK.