c++ - 如何使用 Mysql ++ 将 C++ 变量传递给 C++ 的 Insert

Question

几天以来我一直在努力处理代码，有人可以帮忙吗

std::string str=uri_req1.substr(found+1);
char query[2000];
sprintf(query,"Insert into publish VALUES('%s','NO')",str);

我收到以下警告，并且表中未插入值

warning: cannot pass objects of non-POD type ‘struct std::string’
through ‘...’; call will abort at runtime
warning: format ‘%s’ expects type ‘char*’, but
argument 3 has type ‘int’

我试过的另一件事是

string query;
query="Insert into publish values('";
query+=str;
query+="','NO')";
  mysql_query(&mysql,query);

但这也从来没有用过好心的帮助

Answer 1

我可能会使用字符串流来组装字符串：

std::ostringstream query;

query << "Insert into publish values('" << str << "', 'NO')";
mysql_query(&mysql, query.str().c_str());

Answer 2

这肯定会奏效；）

string query;
query="Insert into publish values('";
query+=str; 
query+="','NO')"; 
mysql_query(&mysql,query.c_str());