兩種不同的連接數(shù)據(jù)庫(kù)的方式來(lái)操作。

MongoClient mongoClient = new MongoClient( “l(fā)ocalhost” , 27017 );

方法1：

DB db = mongoClient.getDB( DBName );

package com.zhl.test;

import java.util.ArrayList;

import java.util.List;

import java.util.Set;

import org.bson.Document;

import com.mongodb.BasicDBObject;

import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBCursor;

import com.mongodb.DBObject;

import com.mongodb.Mongo;

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.MongoIterable;

import com.mongodb.client.model.Filters;

public class CRUD {

public static void main(String[] args) {

CRUD crud = new CRUD();

crud.conn("test");

/*crud.findAll();

crud.insertOne();

crud.findAll();

crud.insertMany();

crud.findAll();*/

// crud.findSome();

crud.findAll();

crud.delete();

crud.findAll();

crud.deleteAll();

crud.findAll();

}

MongoClient mongoClient;

MongoDatabase db ;

public void insertOne(){

//插入文檔

/**

* 1. 創(chuàng)建文檔 org.bson.Document 參數(shù)為key-value的格式

* 2. 創(chuàng)建文檔集合List

* 3. 將文檔集合插入數(shù)據(jù)庫(kù)集合中 mongoCollection.insertMany(List) 插入單個(gè)文檔可以用 mongoCollection.insertOne(Document)

* */

MongoCollection collection = db.getCollection("test");

Document document = new Document("title", "MongoDB").

append("description", "database").

append("likes", 100).

append("by", "Fly");

collection.insertOne(document);

System.out.println("新增單個(gè)文檔成功");

}

public void insertMany(){

//插入文檔

/**

* 1. 創(chuàng)建文檔 org.bson.Document 參數(shù)為key-value的格式

* 2. 創(chuàng)建文檔集合List

* 3. 將文檔集合插入數(shù)據(jù)庫(kù)集合中 mongoCollection.insertMany(List) 插入單個(gè)文檔可以用 mongoCollection.insertOne(Document)

* */

MongoCollection collection = db.getCollection("test");

Document document1 = new Document("title", "MongoDB1").

append("description", "database1").

append("likes", 1001).

append("by", "Fly1");

Document document2 = new Document("title", "MongoDB2").

append("description", "database2").

append("likes", 1002).

append("by", "Fly2");

Document document3 = new Document("title", "MongoDB3").

append("description", "database3").

append("likes", 1003).

append("by", "Fly3");

List documents = new ArrayList();

documents.add(document1); documents.add(document2); documents.add(document3);

collection.insertMany(documents);

System.out.println("批量文檔新增成功");

}

//獲取所有文檔

public void findAll(){

MongoCollection doc = db.getCollection("test");

System.out.println("mycolbbb表數(shù)量："+doc.count());

FindIterable findIterable = doc.find();

MongoCursor mongoCursor = findIterable.iterator();

while(mongoCursor.hasNext()){

System.out.println(mongoCursor.next());

}

}

//獲得所有符合條件的文檔

public void findSome(){

MongoCollection doc = db.getCollection("test");

FindIterable t = doc.find( new Document("likes",100));

MongoCursor a = t.iterator();

while(a.hasNext()){

System.out.println(a.next());

}

a.close();

}

//修改

public void update(){

MongoCollection doc = db.getCollection("test");

doc.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));

System.out.println("update：");

}

//刪除一條符合條件的文檔

public void delete(){

//刪除符合條件的第一個(gè)文檔

MongoCollection doc = db.getCollection("test");

doc.deleteOne(Filters.eq("likes", 1001));

}

//刪除所有符合條件的文檔

public void deleteAll(){

//刪除所有符合條件的文檔

MongoCollection doc = db.getCollection("test");

doc.deleteMany (Filters.eq("likes", 200));

}

public void conn(String DBName){

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

db = mongoClient.getDatabase(DBName);//訪問(wèn) “test” 數(shù)據(jù)庫(kù)

}

}

方法2：

MongoDatabase db = mongoClient.getDatabase(DBName);//訪問(wèn) 數(shù)據(jù)庫(kù)

package com.zhl.test;

import com.mongodb.BasicDBObject;

import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBCursor;

import com.mongodb.DBObject;

import com.mongodb.MongoClient;

public class CRUD2 {

DB db;

/*CRUD2(){

String DBName = "test";

this.db = conn(DBName);

}*/

public static void main(String[] args) {

CRUD2 mongo = new CRUD2();

String DBName = "test";

mongo.db = mongo.conn(DBName);

//mongo.findAll("mycolbbb");

BasicDBObject query = new BasicDBObject();

//query = new BasicDBObject();

query.put("title", "MongoDB"); // 20 < i <= 30 new BasicDBObject("$gt", 20).append("$lte", 900000)

//query.put("_id", new ObjectId("58ca2a3101ccf929c8fd4d79")); //where likes = 840023

mongo.findOne("mycolbbb", query);

//query.put("title","MongoDB");

//mongo.findAll("mycolbbb", query);

/*query.put("title","MongoDB");

BasicDBObject res = new BasicDBObject();

res.put("天王蓋地虎", "寶塔鎮(zhèn)河妖");

BasicDBObject value = new BasicDBObject();

value.put("$set", res);

mongo.update("mycolbbb", query, value);*/

//mongo.findAll("mycolbbb");

//BasicDBObject query = new BasicDBObject();

//query = new BasicDBObject();

//query.put("title", "MongoDB"); // 20 < i <= 30 new BasicDBObject("$gt", 20).append("$lte", 900000)

//query.put("description", "database3"); //where description = database3

//query.put("_id",new ObjectId("58ca2a3101ccf929c8fd4d79"));//指定id刪除

//mongo.deleteAll("mycolbbb", query);

//System.out.println("__________________已刪除——————————————————————————");

//mongo.findAll("mycolbbb");

/*System.out.println("__________________開始新增——————————————————————————");

for(int i = 0; i<10000; i++){

query = new BasicDBObject("title", "MongoDB").

append("description", "database3").

append("likes", 1003).

append("url", "http://www.朱宏亮.com/mongodb3/").

append("by", "朱宏亮.com3");

mongo.insert("mycolbbb", query);

}*/

DBCursor cursor = mongo.findAll("mycolbbb");

System.out.println("length:"+cursor.length()+"\t count():"+cursor.count()+"\t itcount():"+cursor.itcount());

}

public void insert(String tableName, BasicDBObject query){

DBCollection coll = db.getCollection(tableName);

coll.insert(query);

}

//獲取所有文檔

public DBCursor findAll(String tableName){

//DB db = conn();

DBCursor cursor;

DBCollection coll = db.getCollection(tableName);

cursor = coll.find();

System.out.println("數(shù)量："+cursor.count());

/*while(cursor.hasNext()) {

System.out.println(cursor.next());

} */

//cursor.close();

return cursor;

}

//符合條件的第一個(gè)

public void findOne(String tableName, BasicDBObject query){

DBObject cursor;

DBCollection coll = db.getCollection(tableName);

cursor = coll.findOne(query);

System.out.println(cursor.toString());

for(String a : cursor.keySet()){

System.out.println(a+"\t"+cursor.get(a));

}

}

//獲得所有符合條件的文檔

public void findAll(String tableName, BasicDBObject query){

DBCursor cursor;

DBCollection coll = db.getCollection(tableName);

cursor = coll.find(query);

//System.out.println(cursor.toString());

System.out.println("數(shù)量："+cursor.count());

/*while(cursor.hasNext()) {

System.out.println(cursor.next());

} */

cursor.close();

}

//修改

public void update(String tableName, BasicDBObject query, BasicDBObject value){

DBCollection coll = db.getCollection(tableName);

int num = coll.update(query,value,false,true).getN();

System.out.println("刪除："+num);

}

//刪除一條符合條件的文檔

public void delete(String tableName, BasicDBObject query){

DBCollection coll = db.getCollection(tableName);

DBObject myDoc = coll.findOne(query);

int num = coll.remove(myDoc).getN();//刪除

System.out.println("刪除："+num);

}

//刪除所有符合條件的文檔

public void deleteAll(String tableName, BasicDBObject query){

DBCollection coll = db.getCollection(tableName);

int num = coll.remove(query).getN();//刪除

System.out.println("刪除："+num);

}

public DB conn(String DBName){

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

DB db = mongoClient.getDB( DBName );

return db;

}

}

總結(jié)

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