Question

使用java bigquery API时是否可以使用标准SQL查询？我正在尝试执行查询但它会抛出

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Answer 1

有两种方法可以将标准SQL与BigQuery Java API一起使用。第一种是使用int portNumber = 8001; try { ServerSocket serverSocket = new ServerSocket(portNumber); Socket clientSocket = serverSocket.accept(); PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true); BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); String inputLine; while ((inputLine = in.readLine()) != null) { // **** this basically means that read one full line, you have to specify condition like this, so suppose you have created a telnet session with this server now keep on typing and as soon you will hit entered then while block processing will start. System.out.println("@@@ " + inputLine); out.println(inputLine); // *** here same input is written back to the client, so suppose you have telnet session then same input can be seen } } catch (IOException e) { System.out.println( "Exception caught when trying to listen on port " + portNumber + " or listening for a connection"); System.out.println(e.getMessage()); }开始查询文本，例如：

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;

import com.learn.Person;

/**
 * @author himanshu.agrawal
 *
 */
public class TestWebServer2 {

    public static void main(String[] args) throws IOException {
        startWebServer();
    }

    /**
     * test "backlog" in ServerSocket constructor
test -- If <i>bindAddr</i> is null, it will default accepting
     * connections on any/all local addresses.
     * @throws IOException
     */

    private static void startWebServer() throws IOException {
        InetAddress address = InetAddress.getByName("localhost");
        ServerSocket serverSocket = new ServerSocket(8001, 1, address);
        // if set it to 1000 (1 sec.) then after 1 second porgram will exit with SocketTimeoutException because server socket will only listen for 1 second.
        // 0 means infinite
        serverSocket.setSoTimeout(/*1*/0000);

        while(true){
            /*Socket clientSocket = serverSocket.accept();*/ // a "blocking" call which waits until a connection is requested
            System.out.println("1");
            TestWebServer2.SocketThread socketThread = new TestWebServer2().new SocketThread();
            try {
                socketThread.setClientSocket(serverSocket.accept());
                Thread thread = new Thread(socketThread);
                thread.start();
                System.out.println("2");
            } catch (SocketTimeoutException socketTimeoutException) {
                System.err.println(socketTimeoutException);
            }
        }

    }

    public class SocketThread implements Runnable{

        Socket clientSocket;

        public void setClientSocket(Socket clientSocket) throws SocketException {
            this.clientSocket = clientSocket;
            //this.clientSocket.setSoTimeout(2000); // this will set timeout for reading from client socket.
        }

        public void run(){
            System.out.println("####### New client session started." + clientSocket.hashCode() + " | clientSocket.getLocalPort(): " + clientSocket.getLocalPort()
                    + " | clientSocket.getPort(): " + clientSocket.getPort());
            try {
                listenToSocket(); // create this method and you implement what you want to do with the connection.
            } catch (IOException e) {
                System.err.println("#### EXCEPTION.");
                e.printStackTrace();
            }
        }


    }

}

第二种是将#standardSQL设置为#standardSQL SELECT ... FROM YourTable;作为useLegacySql对象的一部分。例如（拍摄from the documentation）：

false

在java bigquery API中使用标准SQL查询

1 个答案: