MongoDb(1)Java連接MongoDb數據庫
/* * This Java source file was generated by the Gradle 'init' task. */ package connectMongoDb; import org.bson.Document; import org.bson.conversions.Bson; import com.mongodb.MongoClient; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoCursor; import com.mongodb.client.MongoDatabase; import com.mongodb.client.model.*; /** * <p>Java連接MongoDb數據庫</p> * @author lius * */ public class Library implements AutoCloseable { private static MongoClient mClient = null; public static void main(String[] args) { //創建實例 Library library = new Library(); //執行實例類start方法 library.start(); } private void start() { //連接本地Mongo服務 MongoClient mClient = new MongoClient("127.0.0.1"); //獲取指定的數據庫 MongoDatabase dataBase = mClient.getDatabase("admin"); //判斷是否存在“a”collection,不存在就創建 if(dataBase.getCollection("a")==null) { dataBase.createCollection("a"); } //獲取指定的collection MongoCollection<Document> coll = dataBase.getCollection("a"); //判斷該collection不存在數據就創建 if(coll.count()<=0) { coll.insertOne(new Document("name","tom").append("sex", "F")); } //查詢collection下“sex”值爲“F”的數據,並將返回的數據集合作爲迭代器 MongoCursor<Document> fs = coll.find(Filters.eq("sex","F")).iterator(); //打印輸出collection下的數據量的統計值 System.out.println(coll.count()); //循環遍歷打印迭代器迭代出的每一個Document,並將Document的數據以Json的形式展現 while(fs.hasNext()) { System.out.println(fs.next().toJson()); } } //實現AutoCloseAble接口,實現實例銷燬自動執行close方法 @Override public void close() throws Exception { // TODO Auto-generated method stub System.out.println("into...close:"); if(mClient!=null) { mClient.close(); System.out.println("close:"+mClient); } } }
MongoDb(1)Java連接MongoDb數據庫
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