JDBC方式链接mongodb

柔情只为你懂 2022-03-31 11:14 730阅读 0赞

JDBC方式的话可以更灵活，为自己以后的积累留一个脚印。

**JAVA驱动版本：**

<dependency>
 <groupId>org.mongodb</groupId>
 <artifactId>mongo-java-driver</artifactId>
 <version>3.0.2</version>
 </dependency>

**工具类代码如下：**

package utils;
 
 import java.util.ArrayList;
 import java.util.List;
 
 import org.apache.commons.configuration.CompositeConfiguration;
 import org.apache.commons.configuration.ConfigurationException;
 import org.apache.commons.configuration.PropertiesConfiguration;
 import org.bson.Document;
 import org.bson.conversions.Bson;
 import org.bson.types.ObjectId;
 
 import com.mongodb.BasicDBObject;
 import com.mongodb.MongoClient;
 import com.mongodb.MongoClientOptions;
 import com.mongodb.MongoClientOptions.Builder;
 import com.mongodb.WriteConcern;
 import com.mongodb.client.MongoCollection;
 import com.mongodb.client.MongoCursor;
 import com.mongodb.client.MongoDatabase;
 import com.mongodb.client.MongoIterable;
 import com.mongodb.client.model.Filters;
 import com.mongodb.client.result.DeleteResult;
 
 /**
 * MongoDB工具类 Mongo实例代表了一个数据库连接池，即使在多线程的环境中，一个Mongo实例对我们来说已经足够了 
 * 注意Mongo已经实现了连接池，并且是线程安全的。 
 * 设计为单例模式， 因 MongoDB的Java驱动是线程安全的，对于一般的应用，只要一个Mongo实例即可， 
 * Mongo有个内置的连接池（默认为10个） 对于有大量写和读的环境中，为了确保在一个Session中使用同一个DB时， 
 * DB和DBCollection是绝对线程安全的 
 * 
 * @author zhoulingfei
 * @date 2015-5-29 上午11:49:49
 * @version 0.0.0
 * @Copyright (c)1997-2015 NavInfo Co.Ltd. All Rights Reserved.
 */
 public enum MongoDBUtil {
 
 /**
 * 定义一个枚举的元素，它代表此类的一个实例
 */
 instance;
 
 private MongoClient mongoClient;
 
 static {
 System.out.println("===============MongoDBUtil初始化========================");
 CompositeConfiguration config = new CompositeConfiguration();
 try {
 config.addConfiguration(new PropertiesConfiguration("mongodb.properties"));
 } catch (ConfigurationException e) {
 e.printStackTrace();
 }
 // 从配置文件中获取属性值
 String ip = config.getString("host");
 int port = config.getInt("port");
 instance.mongoClient = new MongoClient(ip, port);
 
 // or, to connect to a replica set, with auto-discovery of the primary, supply a seed list of members
 // List<ServerAddress> listHost = Arrays.asList(new ServerAddress("localhost", 27017),new ServerAddress("localhost", 27018));
 // instance.mongoClient = new MongoClient(listHost);
 
 // 大部分用户使用mongodb都在安全内网下，但如果将mongodb设为安全验证模式，就需要在客户端提供用户名和密码：
 // boolean auth = db.authenticate(myUserName, myPassword);
 Builder options = new MongoClientOptions.Builder();
 // options.autoConnectRetry(true);// 自动重连true
 // options.maxAutoConnectRetryTime(10); // the maximum auto connect retry time
 options.connectionsPerHost(300);// 连接池设置为300个连接,默认为100
 options.connectTimeout(15000);// 连接超时，推荐>3000毫秒
 options.maxWaitTime(5000); //
 options.socketTimeout(0);// 套接字超时时间，0无限制
 options.threadsAllowedToBlockForConnectionMultiplier(5000);// 线程队列数，如果连接线程排满了队列就会抛出“Out of semaphores to get db”错误。
 options.writeConcern(WriteConcern.SAFE);//
 options.build();
 }
 
 // ------------------------------------共用方法---------------------------------------------------
 /**
 * 获取DB实例 - 指定DB
 * 
 * @param dbName
 * @return
 */
 public MongoDatabase getDB(String dbName) {
 if (dbName != null && !"".equals(dbName)) {
 MongoDatabase database = mongoClient.getDatabase(dbName);
 return database;
 }
 return null;
 }
 
 /**
 * 获取collection对象 - 指定Collection
 * 
 * @param collName
 * @return
 */
 public MongoCollection<Document> getCollection(String dbName, String collName) {
 if (null == collName || "".equals(collName)) {
 return null;
 }
 if (null == dbName || "".equals(dbName)) {
 return null;
 }
 MongoCollection<Document> collection = mongoClient.getDatabase(dbName).getCollection(collName);
 return collection;
 }
 
 /**
 * 查询DB下的所有表名
 */
 public List<String> getAllCollections(String dbName) {
 MongoIterable<String> colls = getDB(dbName).listCollectionNames();
 List<String> _list = new ArrayList<String>();
 for (String s : colls) {
 _list.add(s);
 }
 return _list;
 }
 
 /**
 * 获取所有数据库名称列表
 * 
 * @return
 */
 public MongoIterable<String> getAllDBNames() {
 MongoIterable<String> s = mongoClient.listDatabaseNames();
 return s;
 }
 
 /**
 * 删除一个数据库
 */
 public void dropDB(String dbName) {
 getDB(dbName).drop();
 }
 
 /**
 * 查找对象 - 根据主键_id
 * 
 * @param collection
 * @param id
 * @return
 */
 public Document findById(MongoCollection<Document> coll, String id) {
 ObjectId _idobj = null;
 try {
 _idobj = new ObjectId(id);
 } catch (Exception e) {
 return null;
 }
 Document myDoc = coll.find(Filters.eq("_id", _idobj)).first();
 return myDoc;
 }
 
 /** 统计数 */
 public int getCount(MongoCollection<Document> coll) {
 int count = (int) coll.count();
 return count;
 }
 
 /** 条件查询 */
 public MongoCursor<Document> find(MongoCollection<Document> coll, Bson filter) {
 return coll.find(filter).iterator();
 }
 
 /** 分页查询 */
 public MongoCursor<Document> findByPage(MongoCollection<Document> coll, Bson filter, int pageNo, int pageSize) {
 Bson orderBy = new BasicDBObject("_id", 1);
 return coll.find(filter).sort(orderBy).skip((pageNo - 1) * pageSize).limit(pageSize).iterator();
 }
 
 /**
 * 通过ID删除
 * 
 * @param coll
 * @param id
 * @return
 */
 public int deleteById(MongoCollection<Document> coll, String id) {
 int count = 0;
 ObjectId _id = null;
 try {
 _id = new ObjectId(id);
 } catch (Exception e) {
 return 0;
 }
 Bson filter = Filters.eq("_id", _id);
 DeleteResult deleteResult = coll.deleteOne(filter);
 count = (int) deleteResult.getDeletedCount();
 return count;
 }
 
 /**
 * FIXME
 * 
 * @param coll
 * @param id
 * @param newdoc
 * @return
 */
 public Document updateById(MongoCollection<Document> coll, String id, Document newdoc) {
 ObjectId _idobj = null;
 try {
 _idobj = new ObjectId(id);
 } catch (Exception e) {
 return null;
 }
 Bson filter = Filters.eq("_id", _idobj);
 // coll.replaceOne(filter, newdoc); // 完全替代
 coll.updateOne(filter, new Document("$set", newdoc));
 return newdoc;
 }
 
 public void dropCollection(String dbName, String collName) {
 getDB(dbName).getCollection(collName).drop();
 }
 
 /**
 * 关闭Mongodb
 */
 public void close() {
 if (mongoClient != null) {
 mongoClient.close();
 mongoClient = null;
 }
 }
 
 /**
 * 测试入口
 * 
 * @param args
 */
 public static void main(String[] args) {
 
 String dbName = "GC_MAP_DISPLAY_DB";
 String collName = "COMMUNITY_BJ";
 MongoCollection<Document> coll = MongoDBUtil.instance.getCollection(dbName, collName);
 
 // 插入多条
 // for (int i = 1; i <= 4; i++) {
 // Document doc = new Document();
 // doc.put("name", "zhoulf");
 // doc.put("school", "NEFU" + i);
 // Document interests = new Document();
 // interests.put("game", "game" + i);
 // interests.put("ball", "ball" + i);
 // doc.put("interests", interests);
 // coll.insertOne(doc);
 // }
 
 // // 根据ID查询
 // String id = "556925f34711371df0ddfd4b";
 // Document doc = MongoDBUtil2.instance.findById(coll, id);
 // System.out.println(doc);
 
 // 查询多个
 // MongoCursor<Document> cursor1 = coll.find(Filters.eq("name", "zhoulf")).iterator();
 // while (cursor1.hasNext()) {
 // org.bson.Document _doc = (Document) cursor1.next();
 // System.out.println(_doc.toString());
 // }
 // cursor1.close();
 
 // 查询多个
 // MongoCursor<Person> cursor2 = coll.find(Person.class).iterator();
 
 // 删除数据库
 // MongoDBUtil2.instance.dropDB("testdb");
 
 // 删除表
 // MongoDBUtil2.instance.dropCollection(dbName, collName);
 
 // 修改数据
 // String id = "556949504711371c60601b5a";
 // Document newdoc = new Document();
 // newdoc.put("name", "时候");
 // MongoDBUtil.instance.updateById(coll, id, newdoc);
 
 // 统计表
 // System.out.println(MongoDBUtil.instance.getCount(coll));
 
 // 查询所有
 Bson filter = Filters.eq("count", 0);
 MongoDBUtil.instance.find(coll, filter);
 
 }
 
 }