MongoDB系列——官方JAVA API操作（三）

一、简介

MongoDB常用的JAVA客户端驱动有两种：

• mongodb-driver（官方）：https://docs.mongodb.com/ecosystem/drivers/
• springdata-mongodb：https://spring.io/projects/spring-data-mongodb

NOTE：
3.6版本的MongoDB，只允许localhost连接，如果您要使用非本地的客户端连接，需要绑定IP才可以，在这里我们关闭mongodb服务端，添加参数 --bind_ip，重新启动服务。继续测试~~~

二、maven座标

注意：本博客演示的是官方提供的mongodb-driver

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.6.1</version>
</dependency>

三、插入

@Test
  public void testInsert(){

      MongoClient mongoClient = new MongoClient("192.168.128.156", 27017);

      // 获取指定数据库
      MongoDatabase database = mongoClient.getDatabase("test");

      // 获取指定集合
      MongoCollection<Document> collection = database.getCollection("users");

      // 创建需要插入的单个文档
      Document doc = new Document("name", "MongoDB")
              .append("type", "database")
              .append("count", 1)
              .append("versions", Arrays.asList("v3.2", "v3.0", "v2.6"))
              .append("info", new Document("x", 203).append("y", 102));

      // 测试插入
      collection.insertOne(doc);

      // 测试插入多个文档
      ArrayList<Document> documents = new ArrayList<Document>();
      for (int i = 0; i < 100; i++) {
           documents.add(new Document("i",i));
      }

      collection.insertMany(documents);
      mongoClient.close();
  }

四、修改

 @Test
  public void test3(){
      MongoClient mongoClient = new MongoClient("192.168.128.156", 27017);

      // 获取指定数据库
      MongoDatabase database = mongoClient.getDatabase("test");

      // 获取指定集合
      MongoCollection<Document> collection = database.getCollection("users");

      // update t_user set i = 110 where i = 10
      //UpdateResult updateResult = collection.updateOne(new Document("i", 10), new Document("$set", new Document("i", 110)));

      // update t_user set i =10 where i < 20
      // lt(key,value)  静态导入  import static com.mongodb.client.model.Filters.lt;
      collection.updateMany(lt("i",20),new Document("$set",new Document("i",10).append("test","test value")));

      mongoClient.close();
  }

五、 删除

@Test
  public void test4(){
      MongoClient mongoClient = new MongoClient("192.168.128.156", 27017);

      // 获取指定数据库
      MongoDatabase database = mongoClient.getDatabase("test");

      // 获取指定集合
      MongoCollection<Document> collection = database.getCollection("users");

      DeleteResult deleteResult = null;

      //deleteResult =collection.deleteOne(eq("i", 110));

      deleteResult = collection.deleteMany(lt("i", 20));

      System.out.println("删除的文档数："+deleteResult.getDeletedCount());

      mongoClient.close();
  }

六、 查询

 @Test
  public void test5(){
      MongoClient mongoClient = new MongoClient("192.168.128.156", 27017);

      // 获取指定数据库
      MongoDatabase database = mongoClient.getDatabase("test");

      // 获取指定集合
      MongoCollection<Document> collection = database.getCollection("users");

      // 查所有
      FindIterable<Document> documents = null;

      documents = collection.find();

      // 条件查询 select * fromt t_user where i = 20
      documents = collection.find(eq("i",20));

      // select * from t_user where i <= 20
      documents = collection.find(lte("i",30));

      // select * from t_user where i = 30 or i = 40 or i = 50
      documents = collection.find(in("i",30,40,50));

      // SELECT * FROM t_user WHERE i = 50 OR i < 25
      documents = collection.find(or(new Document("i",50),lt("i",25)));

      // 模糊查询 参数二：模糊条件
      documents = collection.find(regex("test","test"));

      // 排序 SELECT * FROM t_user WHERE i >= 90 order by i desc
      documents = collection.find(gt("i",90)).sort(Sorts.descending("i"));

      // 分页查询
      documents = collection.find().skip(50).limit(10);

      for (Document document : documents) {
          System.out.println(document);
      }

      mongoClient.close();
  }