vc mysql连接失败

#include <mysql_driver.h>
#include <mysql_connection.h>
#include <cppconn/statement.h>
#include <cppconn/resultset.h>
#include <cppconn/exception.h>

int main() {
    try {
        sql::mysql::MySQL_Driver *driver = sql::mysql::get_mysql_driver_instance();
        std::unique_ptr<sql::Connection> con(driver->connect("tcp://127.0.0.1:3306", "username", "password"));
        con->setSchema("database_name");

        std::unique_ptr<sql::Statement> stmt(con->createStatement());
        std::unique_ptr<sql::ResultSet> res(stmt->executeQuery("SELECT * FROM table_name"));

        while (res->next()) {
            std::cout << res->getString(1) << std::endl;
        }
    } catch (sql::SQLException &e) {
        std::cerr << "SQL Error: " << e.what() << std::endl;
    } catch (std::runtime_error &e) {
        std::cerr << "Runtime Error: " << e.what() << std::endl;
    }

    return 0;
}