Question

UPDATE A 
SET Totalfixed = SUM(price * quantity)
FROM Order_t A 
INNER JOIN orderline ol  ON ol.orderid = A.orderid 
INNER JOIN product p  ON ol.productid = p.productid

我无法获得简单的套接字打开它给编译器错误

Answer 1

看起来你正试图融合C和Java。

纯Java中的示例：

import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;

public class MyFirstSocket {
    public static void main(String[] args) {
        Socket socket = new Socket("localhost", 80);
        InputStream in = socket.getInputStream();
        OutputStream out = socket.getOutputStream();
    }
}

如果您想在C中使用套接字，请参阅Simplest Way To Open and Use a Socket in C。

套接字在c中不起作用

1 个答案: