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