MongoDB常用API

1、引入pom

	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-data-mongodb</artifactId>
	</dependency>

2、访问设置

1）mongoDB默认只要本机可以访问，先开放客户端连接权限

./mongod --config /usr/local/mongo/etc/mongo0.conf --bind_ip 0.0.0.0

2）本机连接虚拟机时，需要开开放防火墙端口

firewall-cmd --zone=public --add-port=37010/tcp --permanent
firewall-cmd --reload;

3、常用API

package com.example.demo.utils;


import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import org.bson.Document;

import java.util.regex.Pattern;

/**
 * @Author: pandafox
 * @Desctription: TODO
 * @Date: Created in 2020/7/19 17:16
 * @Version: 1.0
 */
public class TestMgdb {

    public static void main(String[] args) {
        //1.创建连接
        MongoClient client = new MongoClient("192.168.48.128", 37010);

        //2.数据库连接
        MongoDatabase database = client.getDatabase("test");

        //3.创建集合
//        database.createCollection("api_col01");

        //4.查询集合
        MongoCollection<Document> col01 = database.getCollection("api_col01");

        //5.写入文档
//        Random r = new Random();
//        List docs = new ArrayList<>();
//        for (int i = 0; i < 10; i++) {
//            Document doc = new Document();
//            doc.append("name", "name" + i);
//            doc.append("age", r.nextInt(50));
//            docs.add(doc);
//            // collection.insertOne(doc); // 单一写入
//        }
//        col01.insertMany(docs);  // 批量写入

        //6.查询所有
        FindIterable<Document> result = col01.find();
        MongoCursor<Document> cursor = result.iterator();
//        while (cursor.hasNext()) {
//            Document doc = cursor.next();
//            System.out.print("find all : [ { doc : " + doc + " }, ");
//            System.out.print("{ name : " + doc.getString("name") + " }, ");
//            System.out.println("{ age : " + doc.get("age") + " } ]");
//        }

        // 7.更新文档
//        col01.updateMany(Filters.eq("name", "name0"), new Document("$set", new Document("name", "name100")));
//        result = col01.find();
//        cursor = result.iterator();
//        while (cursor.hasNext()) {
//            Document doc = cursor.next();
//            System.out.print("update find all : [ { doc : " + doc + " }, ");
//            System.out.print("{ name : " + doc.getString("name") + " }, ");
//            System.out.println("{ age : " + doc.get("age") + " } ]");
//        }

        // 8.删除文档
//        col01.deleteOne(Filters.eq("name", "name100"));
//        col01.deleteMany(Filters.lt("age", 30));
//        result = col01.find();
//        cursor = result.iterator();
//        while (cursor.hasNext()) {
//            Document doc = cursor.next();
//            System.out.print("delete find all : [ { doc : " + doc + " }, ");
//            System.out.print("{ name : " + doc.getString("name") + " }, ");
//            System.out.println("{ age : " + doc.get("age") + " } ]");
//        }


        // 9.条件查询
        // 查询name = name3的
        result = col01.find(Filters.eq("name", "name3"));
        cursor = result.iterator();
        while (cursor.hasNext()) {
            Document doc = cursor.next();
            System.out.print("eq : [ { doc : " + doc + " }, ");
            System.out.print("{ name : " + doc.getString("name") + " }, ");
            System.out.println("{ age : " + doc.get("age") + " } ]");
        }
        // 查询age > 30的
        result = col01.find(Filters.gt("age", 30));
        // result = collection.find(new Document("age", new Document("$gt", 30)));
        cursor = result.iterator();
        while (cursor.hasNext()) {
            Document doc = cursor.next();
            System.out.print("gt : [ { doc : " + doc + " }, ");
            System.out.print("{ name : " + doc.getString("name") + " }, ");
            System.out.println("{ age : " + doc.get("age") + " } ]");
        }
        // 查询name以n开头，以9结尾的
        result = col01.find(Filters.regex("name", Pattern.compile("^n.*9$")));
        cursor = result.iterator();
        while (cursor.hasNext()) {
            Document doc = cursor.next();
            System.out.print("regex : [ { doc : " + doc + " }, ");
            System.out.print("{ name : " + doc.getString("name") + " }, ");
            System.out.println("{ age : " + doc.get("age") + " } ]");
        }

        // 查询name = name0 并且 age < 50的
        result = col01.find(Filters.and(Filters.eq("name", "name0"), Filters.lt("age", 50)));
        cursor = result.iterator();
        while (cursor.hasNext()) {
            Document doc = cursor.next();
            System.out.print("and query : [ { doc : " + doc + " }, ");
            System.out.print("{ name : " + doc.getString("name") + " }, ");
            System.out.println("{ age : " + doc.get("age") + " } ]");
        }

        // 查询name = name0 或者 age < 50的
        result = col01.find(Filters.or(Filters.eq("name", "name0"), Filters.lt("age", 50)));
        cursor = result.iterator();
        while (cursor.hasNext()) {
            Document doc = cursor.next();
            System.out.print("or query : [ { doc : " + doc + " }, ");
            System.out.print("{ name : " + doc.getString("name") + " }, ");
            System.out.println("{ age : " + doc.get("age") + " } ]");
        }

    }

}

package com.example.demo.utils;

import com.mongodb.MongoClient;
import com.mongodb.MongoClientOptions;
import com.mongodb.ServerAddress;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

import java.util.Arrays;

/**
 * @Author: pandafox
 * @Desctription: TODO
 * @Date: Created in 2020/7/19 21:57
 * @Version: 1.0
 */
public class TestMgdb2 {


    public static void main(String[] args) {
        try {
            // 连接池
            MongoClientOptions.Builder builder = new MongoClientOptions.Builder();
            builder.connectTimeout(5000); // 连接超时
            builder.socketTimeout(5000); // 读写超时
            builder.connectionsPerHost(30); // 每个地址的最大连接数

            // 提供用户名和密码
            // MongoCredential credential = MongoCredential.createScramSha1Credential("username", "databaseName", "password".toCharArray());

            // 集群访问， 请求地址传入多个
            MongoClient client = new MongoClient(Arrays.asList(
                    new ServerAddress("192.168.48.128", 37010)
//                    new ServerAddress("192.168.48.128", 37011),
//                    new ServerAddress("192.168.48.128", 37012)
            ), builder.build());
            // 连接时校验用户
            // MongoClient client = new MongoClient(Arrays.asList(new ServerAddress("192.168.48.128", 37010)), credential, builder.build());

            MongoDatabase database = client.getDatabase("test");

            MongoCollection<Document> col01 = database.getCollection("api_col01");

            FindIterable<Document> result = col01.find().limit(2).skip(2).sort(new Document("age", 1));
            System.out.println(result);
            MongoCursor<Document> cursor = result.iterator();
//            while (cursor.hasNext()) {
//                Document doc = cursor.next();
//                System.out.print("find all : [ { doc : " + doc + " }, ");
//                System.out.print("{ name : " + doc.getString("name") + " }, ");
//                System.out.println("{ age : " + doc.get("age") + " } ]");
//            }

        } catch (Exception e) {
            System.err.println(e.getClass().getName() + ": " + e.getMessage());
        }
    }

}