Java操作MongoDB數據庫的示例代碼
mongodb-driver是mongo官方推出的java連接mongoDB的驅動包，相當於JDBC驅動。
環境準備
step1：創建工程 , 引入依賴
<dependencies> <dependency> <groupId>org.mongodb</groupId> <artifactId>mongodb‐driver</artifactId> <version>3.6.3</version> </dependency> </dependencies>
step2：創建測試類
import com.mongodb.*;
import com.mongodb.client.*;
import com.mongodb.client.model.Filters;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
public class MogoDBTest {
private static MongoClient mongoClient;
static {
System.out.println("===============MongoDBUtil初始化========================");
mongoClient = new MongoClient("127.0.0.1", 27017);
// 大多使用mongodb都在安全內網下，但如果將mongodb設為安全驗證模式，就需要在客戶端提供用戶名和密碼：
// boolean auth = db.authenticate(myUserName, myPassword);
MongoClientOptions.Builder options = new MongoClientOptions.Builder();
options.cursorFinalizerEnabled(true);
// 自動重連true
// options.autoConnectRetry(true);
// the maximum auto connect retry time
// 連接池設置為300個連接,默認為100
// options.maxAutoConnectRetryTime(10);
options.connectionsPerHost(300);
// 連接超時，推薦>3000毫秒
options.connectTimeout(30000);
options.maxWaitTime(5000);
// 套接字超時時間，0無限制
options.socketTimeout(0);
// 線程隊列數，如果連接線程排滿瞭隊列就會拋出“Out of semaphores to get db”錯誤。
options.threadsAllowedToBlockForConnectionMultiplier(5000);
options.writeConcern(WriteConcern.SAFE);//
options.build();
}
// =================公用用方法=================
/**
* 獲取DB實例 - 指定數據庫，若不存在則創建
*/
public static MongoDatabase getDB(String dbName) {
if (dbName != null && !"".equals(dbName)) {
MongoDatabase database = mongoClient.getDatabase(dbName);
return database;
}
return null;
}
/**
* 獲取指定數據庫下的collection對象
*/
public static 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;
}
}
1.數據庫操作
1.1獲取所有數據庫
//獲取所有數據庫
@Test
public void getAllDBNames(){
MongoIterable<String> dbNames = mongoClient.listDatabaseNames();
for (String s : dbNames) {
System.out.println(s);
}
}
1.2獲取指定庫的所有集合名
//獲取指定庫的所有集合名
@Test
public void getAllCollections(){
MongoIterable<String> colls = getDB("books").listCollectionNames();
for (String s : colls) {
System.out.println(s);
}
}
1.3.刪除數據庫
//刪除數據庫
@Test
public void dropDB(){
//連接到數據庫
MongoDatabase mongoDatabase = getDB("test");
mongoDatabase.drop();
}
2.文檔操作
2.1插入文檔
1.插入單個文檔
//插入一個文檔
@Test
public void insertOneTest(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//要插入的數據
Document document = new Document("id",1)
.append("name", "哈姆雷特")
.append("price", 67);
//插入一個文檔
collection.insertOne(document);
System.out.println(document.get("_id"));
}
2.插入多個文檔
//插入多個文檔
@Test
public void insertManyTest(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//要插入的數據
List<Document> list = new ArrayList<>();
for(int i = 1; i <= 15; i++) {
Document document = new Document("id",i)
.append("name", "book"+i)
.append("price", 20+i);
list.add(document);
}
//插入多個文檔
collection.insertMany(list);
}
2.2查詢文檔
2.2.1基本查詢
1.查詢集合所有文檔
@Test
public void findAllTest(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//查詢集合的所有文檔
FindIterable findIterable= collection.find();
MongoCursor cursor = findIterable.iterator();
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
}
2.條件查詢
@Test
public void findConditionTest(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//方法1.構建BasicDBObject 查詢條件 id大於2，小於5
BasicDBObject queryCondition=new BasicDBObject();
queryCondition.put("id", new BasicDBObject("$gt", 2));
queryCondition.put("id", new BasicDBObject("$lt", 5));
//查詢集合的所有文 通過price升序排序
FindIterable findIterable= collection.find(queryCondition).sort(new BasicDBObject("price",1));
//方法2.通過過濾器Filters，Filters提供瞭一系列查詢條件的靜態方法，id大於2小於5，通過id升序排序查詢
//Bson filter=Filters.and(Filters.gt("id", 2),Filters.lt("id", 5));
//FindIterable findIterable= collection.find(filter).sort(Sorts.orderBy(Sorts.ascending("id")));
//查詢集合的所有文
MongoCursor cursor = findIterable.iterator();
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
}
2.2.2 投影查詢
@Test
public void findAllTest3(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//查詢id等於1,2,3,4的文檔
Bson fileter=Filters.in("id",1,2,3,4);
//查詢集合的所有文檔
FindIterable findIterable= collection.find(fileter).projection(new BasicDBObject("id",1).append("name",1).append("_id",0));
MongoCursor cursor = findIterable.iterator();
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
}
2.3分頁查詢
2.3.1.統計查詢
//集合的文檔數統計
@Test
public void getCountTest() {
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//獲取集合的文檔數
Bson filter = Filters.gt("price", 30);
int count = (int)collection.count(filter);
System.out.println("價錢大於30的count==："+count);
}
2.3.2分頁列表查詢
//分頁查詢
@Test
public void findByPageTest(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//分頁查詢 跳過0條，返回前10條
FindIterable findIterable= collection.find().skip(0).limit(10);
MongoCursor cursor = findIterable.iterator();
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
System.out.println("----------取出查詢到的第一個文檔-----------------");
//取出查詢到的第一個文檔
Document document = (Document) findIterable.first();
//打印輸出
System.out.println(document);
}
2.4修改文檔
//修改文檔
@Test
public void updateTest(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//修改id=2的文檔 通過過濾器Filters，Filters提供瞭一系列查詢條件的靜態方法
Bson filter = Filters.eq("id", 2);
//指定修改的更新文檔
Document document = new Document("$set", new Document("price", 44));
//修改單個文檔
collection.updateOne(filter, document);
//修改多個文檔
// collection.updateMany(filter, document);
//修改全部文檔
//collection.updateMany(new BasicDBObject(),document);
}
2.5 刪除文檔
//刪除與篩選器匹配的單個文檔
@Test
public void deleteOneTest(){
//獲取集合
MongoCollection<Document> collection = getCollection("books","book");
//申明刪除條件
Bson filter = Filters.eq("id",3);
//刪除與篩選器匹配的單個文檔
collection.deleteOne(filter);
//刪除與篩選器匹配的所有文檔
// collection.deleteMany(filter);
System.out.println("--------刪除所有文檔----------");
//刪除所有文檔
// collection.deleteMany(new Document());
}
以上就是Java操作MongoDB的示例代碼的詳細內容，更多關於Java操作MongoDB的資料請關註WalkonNet其它相關文章！
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