C++的MySQL連接器選擇從字符串

Question

我試圖從表中選擇的ID其中，IP地址= [字符串]

我會從另一個函數來獲取IP地址

std::string GetIP(){ 
    return IP; 
    } 

    sql::Driver *driver; 
    sql::Connection *con; 
    sql::Statement *stmt; 
    sql::ResultSet *res; 
    sql::PreparedStatement *pstmt; 

    driver = get_driver_instance(); 
    con = driver->connect("tcp://127.0.0.1.:3306", "root", "password"); 
    con->setSchema("Test"); 
stmt = con->createStatement(); 
string GETI = "84.54.584.6"; // will be GetIP() 
res = stmt->executeQuery("SELECT ID FROM IPs Where IP_Address = '"+ GETI +"'"); 
while (res->next()) { 
cout << "id = " << res->getInt(1); 
} 
delete res; 
delete stmt; 
delete con; 

我沒有得到任何錯誤Visual Studio中的錯誤列表

但是當我嘗試

當我運行它不顯示值和應用程序崩潰

應用

res = stmt->executeQuery("SELECT ID FROM IPs Where IP_Address = '84.54.584.6'"); 

我得到它做工精細

Answer 1

res = stmt->executeQuery(std::string("SELECT ID FROM IPs Where IP_Address = '"+ GETI +'\'').c_str());