MongoDB学习日记 - java代码（七）：runCommand & BasicDBObject

这里的示例代码都是简要代码，详细代码可以参考我打包好的代码，地址：百度云 mongo-demo.rar ，这部分代码在other中

runCommand

MongoClient client = new MongoClient();
        MongoDatabase database = client.getDatabase("mydb");
        // buildInfo 版本信息 
        // Document{{version=3.0.6, 
        //           gitVersion=1ef45a23a4c5e3480ac919b28afcba3c615488f2, 
        //           targetMinOS=Windows 7/Windows Server 2008 R2, 
        //           OpenSSLVersion=OpenSSL 1.0.1p-fips 9 Jul 2015, 
        //           sysInfo=windows sys.getwindowsversion(major=6,
        //           minor=1, build=7601, platform=2, service_pack='Service Pack 1') 
        //           ...
        // }}
        Document buildInfo = database.runCommand(new Document("buildInfo", 1));
        System.out.println(buildInfo);

        client.close();

语法解释：

db.runCommand( { "buildInfo" : 1 } )

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BasicDBObject

注：这是一个用来查询的类

MongoClient client = new MongoClient();     
MongoDatabase database = client.getDatabase("mydb");

// Pass BasicDBObject.class as the second argument
MongoCollection<BasicDBObject> collection = database.getCollection("mycoll", BasicDBObject.class);

// insert a document
BasicDBObject document = new BasicDBObject("x", 1);
collection.insertOne(document);
document.append("x", 2).append("y", 3);

// replace a document
collection.replaceOne(Filters.eq("_id", document.get("_id")), document);

// find documents
List<BasicDBObject> foundDocument = collection.find().into(new ArrayList<BasicDBObject>());
for (BasicDBObject basicDBObject : foundDocument) {
    System.out.println(basicDBObject);
}

client.close();

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这里都是比较简单的例子，仅供学习使用，不喜勿喷。如果以后开发需要，我会继续拓展博客。