MongoDB（二）-- Java API 实现增删改查

一、下载jar包

　　http://central.maven.org/maven2/org/mongodb/mongo-java-driver/

二、代码实现

 package com.xbq.mongodb;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import org.bson.types.ObjectId;
 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.util.JSON;

 /**
  * @ClassName: MongoDBTest
  * @Description: TODO MongoDB 增删改查 操作，包含批量操作
  * @author xbq
  * @version 1.0
  * @date 2017-4-5 上午11:50:06
  */
 public class MongoDBTest {

     private static final String HOST = "192.168.242.129";
     private static final int PORT = 27017;
     private static final String DB_NAME = "testDB";
     private static Mongo mongo;
     private static DB db;

     static {
         // 连接到MongoDB
         mongo = new Mongo(HOST, PORT);
         // 打开数据库 testDB
         db = mongo.getDB(DB_NAME);
     }

     public static void main(String[] args) {
         // 获取集合 xbqTable，若该集合不存在，mongoDB将自动创建该集合
         DBCollection dbCollection = db.getCollection("testTable");

         // 查询该数据库所有的集合名
         for(String name : mongo.getDatabaseNames()){
             System.out.println(name);
         }

 //        addOne(dbCollection);
 //        addList(dbCollection);
 //        addByJson(dbCollection);

 //        deleteOne(dbCollection);
 //        deleteByIn(dbCollection);
 //        deleteAll(dbCollection);

 //        updateOne(dbCollection);
 //        updateMulti(dbCollection);

 //        queryOne(dbCollection);
 //        queryPage(dbCollection);
 //        queryRange(dbCollection);
         queryList(dbCollection);

     }

     // ====================================查询开始==============================================
     /**
      * @Title: queryOne
      * @Description: TODO 查询 name为 张三的 一条记录
      * @param dbCollection
      * @return: void
      */
     public static void queryOne(DBCollection dbCollection){
         DBObject documents = new BasicDBObject("name","张三");
         DBObject result = dbCollection.findOne(documents);
         System.out.println(result);
     }

     /**
      * @Title: queryPage
      * @Description: TODO 分页查询  ， 查询 跳过前2条 后的 3条 数据
      * @param dbCollection
      * @return: void
      */
     public static void queryPage(DBCollection dbCollection){
         DBCursor cursor = dbCollection.find().skip(2).limit(3);
         while (cursor.hasNext()) {
             System.out.println(cursor.next());
         }
     }

     /**
      * @Title: queryRange
      * @Description: TODO 范围查询，查询 第3条 到 第5条 之间的记录
      * @param dbCollection
      * @return: void
      */
     public static void queryRange(DBCollection dbCollection) {
         DBObject range = new BasicDBObject();
         range.put("$gte", 50);
         range.put("$lte", 52);

         DBObject dbObject = new BasicDBObject();
         dbObject.put("age", range);
         DBCursor cursor = dbCollection.find(dbObject);
         while (cursor.hasNext()) {
             System.out.println(cursor.next());
         }
     }

     /**'
      * @Title: queryList
      * @Description: TODO 查询出全部的 记录
      * @param dbCollection
      * @return: void
      */
     public static void queryList(DBCollection dbCollection) {
         DBCursor cursor = dbCollection.find();
         DBObject dbObject = null;
         while(cursor.hasNext()){
             dbObject = cursor.next();
             System.out.println(dbObject);
         }
     }

     // ====================================增加开始==============================================
     /**
      * @Title: addOne
      * @Description: TODO 新增 一条记录
      * @param dbCollection
      * @return: void
      */
     public static void addOne(DBCollection dbCollection){
         DBObject documents = new BasicDBObject("name","张三").append("age", 45).append("sex", "男").append("address",
                 new BasicDBObject("postCode", 100000).append("street", "深南大道888号").append("city", "深圳"));
         dbCollection.insert(documents);
     }

     /**
      * @Title: addList
      * @Description: TODO 批量新增 记录    , 增加的记录 中 可以使用各种数据类型
      * @param dbCollection
      * @return: void
      */
     public static void addList(DBCollection dbCollection){
         List<DBObject> listdbo= new ArrayList<DBObject>();
         DBObject dbObject = new BasicDBObject();
         dbObject.put("name", "老王");
         // 可以直接保存List类型
         List<String> list = new ArrayList<String>();
         list.add("非隔壁老王");
         dbObject.put("remark", list);
         listdbo.add(dbObject);

         dbObject = new BasicDBObject();
         // 可以直接保存map
         Map<String,List<String>> map = new HashMap<String,List<String>>();
         List<String> hobbys = new ArrayList<String>();
         hobbys.add("看花");
         hobbys.add("采花");
         map.put("爱好", hobbys);
         dbObject.put("hobby", map);
         listdbo.add(dbObject);

         dbObject = new BasicDBObject();
         dbObject.put("name", "老张");
         dbObject.put("age", 52);
         dbObject.put("job", "看守老王");
         dbObject.put("remark", new BasicDBObject("address", "广东省深圳市").append("street", "深南大道888号"));
         listdbo.add(dbObject);

         dbCollection.insert(listdbo);
     }

     /**
      * @Title: addByJson
      * @Description: TODO json转对象后 ，执行新增
      * @param dbCollection
      * @return: void
      */
     public static void addByJson(DBCollection dbCollection){
         String json = "{ \"name\" : \"王五\" , \"age\" : 66 , \"job\" : \"看守老王\" , \"remark\" : { \"address\" : \"广东省深圳市\" , \"street\" : \"深南大道888号\"}}";
         DBObject dbObject = (DBObject) JSON.parse(json);
         dbCollection.insert(dbObject);
     }

     // ====================================修改开始==============================================
     /**
      * @Title: update
      * @Description: TODO 修改指定记录
      * @param dbCollection
      * @return: void
      */
     public static void updateOne(DBCollection dbCollection) {
         // 先根据id查询将 这条 记录查询出来
         DBObject qryResult = dbCollection.findOne(new ObjectId("58e4a11c6c166304f0635958"));
         // 修改指定的值
         qryResult.put("age", 55);

         DBObject olddbObject = new BasicDBObject();
         olddbObject.put("_id", new ObjectId("58e4a11c6c166304f0635958"));
         dbCollection.update(olddbObject, qryResult);
     }

     /**
      * @Title: updateMulti
      * @Description: TODO 修改 多条记录
      * @param dbCollection
      * @return: void
      */
     public static void updateMulti(DBCollection dbCollection) {
         DBObject newdbObject = new BasicDBObject();
         newdbObject.put("name", "张三");
         newdbObject.put("address", "广东深圳");
         newdbObject.put("remark", "张三是一个NB的Coder");

         DBObject olddbObject = new BasicDBObject();
         olddbObject.put("name", "张三");
         // 需要加上这个
         DBObject upsertValue = new BasicDBObject("$set", newdbObject);
         // 后面的两个参数：1.若所更新的数据没有，则插入 ; 2、同时更新多个符合条件的文档(collection)
         dbCollection.update(olddbObject, upsertValue, true, true);
     }

     // ====================================删除开始==============================================
     /**
      * @Title: deleteFirst
      * @Description: TODO 删除第一个
      * @param
      * @return: void
      */
     public static void deleteFirst(DBCollection dbCollection){
         DBObject dbObject = dbCollection.findOne();
         dbCollection.remove(dbObject);
     }

     /**
      * @Title: deleteOne
      * @Description: TODO 删除指定的一条记录
      * @param dbCollection
      * @return: void
      */
     public static void deleteOne(DBCollection dbCollection){
         DBObject dbObject = new BasicDBObject();
         dbObject.put("_id", new ObjectId("58e49c2d6c166309e0d50484"));
         dbCollection.remove(dbObject);
     }

     /**
      * @Title: deleteByIn
      * @Description: TODO 删除多条记录      例如：select * from tb where name in('12','34')
      * @param dbCollection
      * @return: void
      */
     public static void deleteByIn(DBCollection dbCollection) {
         List<String> list = new ArrayList<String>();
         list.add("老张");
         list.add("老王");
         list.add("张三");
         DBObject dbObject = new BasicDBObject("$in", list);

         DBObject delObject = new BasicDBObject();
         delObject.put("name", dbObject);
         dbCollection.remove(delObject);
     }

     /**
      * @Title: deleteAll
      * @Description: TODO 删除全部的记录
      * @param dbCollection
      * @return: void
      */
     public static void deleteAll(DBCollection dbCollection){
         DBCursor cursor = dbCollection.find();
         while(cursor.hasNext()){
             dbCollection.remove(cursor.next());
         }
     }
 }

三、源码下载

　　点我下载