Question

我正在寻找检查Mongo DB连接的最佳方法。情况：客户端向服务器发出请求（api）。服务器返回所有数据库的状态。

最好的方法是什么？

Answer 1

我用这个：

Builder o = MongoClientOptions.builder().connectTimeout(3000);  
MongoClient mongo = new MongoClient(new ServerAddress("192.168.0.1", 3001), o.build());    

try {
  mongo.getAddress();
} catch (Exception e) {
  System.out.println("Mongo is down");
  mongo.close();
  return;
}

Answer 2

在Java MongoDriver 3.3.0中，使用ServerMonitorListener来确定服务器是否已启动并已连接。这是示例代码，

public class ServerConnection implements ServerMonitorListener {
    private MongoClient client;

    public ServerConnection(){
        try {
            MongoClientOptions clientOptions = new MongoClientOptions.Builder()
                .addServerMonitorListener(this)
                .build();

            client = new MongoClient(new ServerAddress("localhost", 27017), clientOptions);
        } catch (Exception ex) {

        }
    }

    @Override
    public void serverHearbeatStarted(ServerHeartbeatStartedEvent serverHeartbeatStartedEvent) {
        // Ping Started
    }

    @Override
    public void serverHeartbeatSucceeded(ServerHeartbeatSucceededEvent serverHeartbeatSucceededEvent) {
        // Ping Succeed, Connected to server
    }

    @Override
    public void serverHeartbeatFailed(ServerHeartbeatFailedEvent serverHeartbeatFailedEvent) {
        // Ping failed, server down or connection lost
    }
}

Answer 3

ping命令是一个无操作，用于测试服务器是否响应命令。即使服务器处于写锁定状态，此命令也会立即返回：

import numpy as np
a = np.arange(16).reshape(4, 4).astype(float)
print (a)
[[  0.   1.   2.   3.]
 [  4.   5.   6.   7.]
 [  8.   9.  10.  11.]
 [ 12.  13.  14.  15.]]


il1 = np.tril_indices(4)
a[il1] = np.nan
print (a)
[[ nan   1.   2.   3.]
 [ nan  nan   6.   7.]
 [ nan  nan  nan  11.]
 [ nan  nan  nan  nan]]

df = pd.DataFrame(data=a, columns=['a','b','c','d'])
print (df)
    a    b    c     d
0 NaN  1.0  2.0   3.0
1 NaN  NaN  6.0   7.0
2 NaN  NaN  NaN  11.0
3 NaN  NaN  NaN   NaN

Answer 4

如果我正确理解您的问题，您希望通过Web服务调用返回状态。您可以编写一个调用db.serverStatus()的函数并让它返回数据。查看文档：

Monitoring for MongoDB

Answer 5

对Java使用MongoClient，您需要的所有信息都在这里......

http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-java-driver/

MongoDB：检查与DB的连接

5 个答案: