C++ And SQLite - How to execute a query formed by user input?

I'm working on a project where the user can insert a record into a SQLite database. The query will come generated automatically in the following method:

string ID = "";
string title = "";
string password = "";

cout << "Insert ID:\n";
cin >> ID;
cout << "Insert title of password:\n";
cin >> title;
cout << "Insert password:\n";
cin >> password;

string sql = "INSERT INTO test (ID,title,password) VALUES(" + ID + "," + title + "," + password + ");";

When i try to compile the program i get the error:

    classes.h:74:76: error: invalid operands of types ‘const char*’ and ‘const char [2]’ to binary ‘operator+’
   string sql = "INSERT INTO passwords (ID,title,password) VALUES (" + id + "," + title + "," + password 
                                                                            ^
classes.h:78:42: error: invalid operands of types ‘int’ and ‘sqlite3_stmt*’ to binary ‘operator&’
    sqlite3_prepare( db, sql.c_str(), -1 &st, NULL);

seem that he can't accept multiple character. Can someone show me how to fix this error?

P.S. I'm new in c++

Any help is appreciated. Thanks.