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(); 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(); 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