SQL数据插入字符串时转义函数

函数一:

std::string CheckString(std::string& strSource)   
{
    std::string strOldValue = "'";
    std::string strNewValue = "''";
    for(std::string::size_type pos(0); pos != std::string::npos; pos += strNewValue.length())   
    {   
        if ((pos = strSource.find(strOldValue, pos)) != std::string::npos) 
        {
            strSource.replace(pos, strOldValue.length(), strNewValue);   
        }
        else
        {
            break; 
        }    
    }   
    return strSource;   
}

方法二：

std::string& replace_all_distinct(std::string& str,const std::string& old_value,const std::string& new_value)
{
    for(std::string::size_type pos(0); pos!=std::string::npos; pos+=new_value.length()) 
    {   
        if((pos=str.find(old_value,pos)) != std::string::npos)   
            str.replace(pos,old_value.length(),new_value);   
        else
        {
            break;
        }   
    }   
    return str;   
}

使用:

例如:

replace_all_distinct("sub'ject","'","''");
CheckString("subj'e'ct");

字符串中有单引号