Java中连接Mongodb进行增删改查的操作详解

<dependency>
      <groupId>org.mongodb</groupId>
      <artifactId>mongodb-driver-sync</artifactId>
      <version>5.1.0</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mongodb/bson -->
    <dependency>
      <groupId>org.mongodb</groupId>
      <artifactId>bson</artifactId>
      <version>5.1.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mongodb/mongodb-driver-core -->
    <dependency>
      <groupId>org.mongodb</groupId>
      <artifactId>mongodb-driver-core</artifactId>
      <version>5.1.0</version>
    </dependency>

db.players.insertOne({name:"palyer1",height:181,weigh:90})
{
  acknowledged: true,
  insertedId: ObjectId('665c5e0a522ef6dba6a26a13')
}
test> db.players.insertOne({name:"palyer2",height:190,weigh:100})
{
  acknowledged: true,
  insertedId: ObjectId('665c5e18522ef6dba6a26a14')
}
test> db.players.find()
[
  {
    _id: ObjectId('665c5e0a522ef6dba6a26a13'),
    name: 'player1',
    height: 181,
    weigh: 90
  },
  {
    _id: ObjectId('665c5e18522ef6dba6a26a14'),
    name: 'player2',
    height: 190,
    weigh: 100
  }
]

public class QuickStart {

    public static void main(String[] args) {
        // 连接的url
        String uri = "mongodb://node02:27017";
        try (MongoClient mongoClient = MongoClients.create(uri)) {
            MongoDatabase database = mongoClient.getDatabase("test");
            MongoCollection<Document> collection = database.getCollection("players");
            Document doc = collection.find(eq("name", "palyer2")).first();
            if (doc != null) {
                //{"_id": {"$oid": "665c5e18522ef6dba6a26a14"}, "name": "palyer2", "height": 190, "weigh": 100}
                System.out.println(doc.toJson());
            } else {
                System.out.println("No matching documents found.");
            }
        }
    }

}

 @Test
    public void InsertDocument()
    {
        MongoDatabase database = mongoClient.getDatabase("test");
        MongoCollection<Document> collection = database.getCollection("map");
        try {
            // 插入地图文档
            InsertOneResult result = collection.insertOne(new Document()
                    .append("_id", new ObjectId())
                    .append("name", "beijing")
                    .append("longitude", "40°N")
                    .append("latitude", "116°E"));
            //打印文档的id
            //Success! Inserted document id: BsonObjectId{value=665c6424a080bb466d32e645}
            System.out.println("Success! Inserted document id: " + result.getInsertedId());
            // Prints a message if any exceptions occur during the operation
        } catch (MongoException me) {
            System.err.println("Unable to insert due to an error: " + me);
        }

 @Test
    public void UpdateDocument(){
        MongoDatabase database = mongoClient.getDatabase("test");
        MongoCollection<Document> collection = database.getCollection("map");
        //构造更新条件
        Document query = new Document().append("name",  "beijing");
        // 指定更新的字段
        Bson updates = Updates.combine(
                Updates.set("longitude", "40.0N"),
                Updates.set("latitude", "116.0E")
        );
        // Instructs the driver to insert a new document if none match the query
        UpdateOptions options = new UpdateOptions().upsert(true);
        try {
            // 更新文档
            UpdateResult result = collection.updateOne(query, updates, options);
            // Prints the number of updated documents and the upserted document ID, if an upsert was performed
            System.out.println("Modified document count: " + result.getModifiedCount());
            System.out.println("Upserted id: " + result.getUpsertedId());

        } catch (MongoException me) {
            System.err.println("Unable to update due to an error: " + me);
        }
    }

 @Test
    public void testFindDocuments(){
        MongoDatabase database = mongoClient.getDatabase("test");
        MongoCollection<Document> collection = database.getCollection("map");
        // 创建检索条件
        /*Bson projectionFields = Projections.fields(
                Projections.include("name", "shanghai"),
                Projections.excludeId());*/
        // 匹配过滤检索文档
        MongoCursor<Document> cursor = collection.find(eq("name", "shanghai"))
                //.projection(projectionFields)
                .sort(Sorts.descending("longitude")).iterator();
        // 打印检索到的文档
        try {
            while(cursor.hasNext()) {
                System.out.println(cursor.next().toJson());
            }
        } finally {
            cursor.close();
        }
    }

 @Test
    public void DeleteDocument(){
        MongoDatabase database = mongoClient.getDatabase("test");
        MongoCollection<Document> collection = database.getCollection("map");
        Bson query = eq("name", "shanghai");
        try {
            // 删除名字为shanghai的地图
            DeleteResult result = collection.deleteOne(query);
            System.out.println("Deleted document count: " + result.getDeletedCount());
            // 打印异常消息
        } catch (MongoException me) {
            System.err.println("Unable to delete due to an error: " + me);
        }
    }