当前位置：首页 > news >正文

MongoDB Helloworld For Window

news 来源：原创 2024/5/20 12:06:37

1. 下载MongoDB

Download MongoDB Community Server | MongoDB

2. 安装MongoDB

3. 创建DB.

4. 用java code 连接mongo. 做增删改查操作。

pom.xml

        <dependency><groupId>org.mongodb</groupId><artifactId>mongodb-driver-sync</artifactId><version>4.3.3</version> <!-- Make sure to use the latest version --></dependency>

在User collection上增加记录

package org.example;import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;public class MongoDBSaveDataExample {public static void main(String[] args) {try (MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017")) {MongoDatabase database = mongoClient.getDatabase("test");System.out.println("Connected to the database successfully.");// Access the collection (if it doesn't exist, MongoDB will create it)database.getCollection("users").insertOne(new Document("name", "John Doe").append("age", 30).append("email", "john.doe@example.com"));System.out.println("Data saved successfully.");} catch (Exception e) {System.err.println("Error: " + e);}}
}

修改

package org.example;import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.result.UpdateResult;
import org.bson.Document;public class MongoDBUpdateDataExample {public static void main(String[] args) {try (MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017")) {MongoDatabase database = mongoClient.getDatabase("test");System.out.println("Connected to the database successfully.");// Update dataUpdateResult updateResult = database.getCollection("users").updateOne(Filters.eq("name", "John Doe"), new Document("$set", new Document("age", 31)));System.out.println("Matched count: " + updateResult.getMatchedCount());System.out.println("Modified count: " + updateResult.getModifiedCount());} catch (Exception e) {System.err.println("Error: " + e);}}
}

删除

package org.example;import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.result.DeleteResult;
import org.bson.Document;public class MongoDBDeleteDataExample {public static void main(String[] args) {try (MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017")) {MongoDatabase database = mongoClient.getDatabase("test");System.out.println("Connected to the database successfully.");// Delete dataDeleteResult deleteResult = database.getCollection("users").deleteOne(new Document("name", "John Doe"));System.out.println("Deleted count: " + deleteResult.getDeletedCount());} catch (Exception e) {System.err.println("Error: " + e);}}
}

查询

package org.example;import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.FindIterable;
import org.bson.Document;public class MongoDBQueryDataExample {public static void main(String[] args) {try (MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017")) {MongoDatabase database = mongoClient.getDatabase("test");System.out.println("Connected to the database successfully.");// Query dataFindIterable<Document> iterable = database.getCollection("users").find(Filters.eq("name", "John Doe"));// Iterate through the result setfor (Document document : iterable) {System.out.println("Name: " + document.getString("name"));System.out.println("Age: " + document.getInteger("age"));System.out.println("Email: " + document.getString("email"));}} catch (Exception e) {System.err.println("Error: " + e);}}
}

在MongoDB ui 上可以查看数据