mongodb中存储的文档格式如下,实现查询fromdata下did和dvid为指定值的数据 { "_id": { "$oid": "553f4a9facc494278f5ad1b0" }, "rid": "9eec7fbe8a6f4d17b02756fdbcefcc41", "rname": "测试场景1", "username": "…

morphia是谷歌的一个针对mongodb的数据化持久框架: 关于mongodb的介绍不在这里展示,直接进入主题:采用morphia实现对mongodb的聚合查询 这里获取所有学生的分数总和 spring配置文件 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi=…

Spring Data MongoDB 三:基本文档查询(Query.BasicQuery)(一) 学习MongoDB 六: MongoDB查询(游标操作.游标信息)(三) 一．简单介绍 SpringData  MongoDB提供了org.springframework.data.mongodb.core.MongoTemplate对MongoDB的find的操作.我们上一篇介绍了基本文档的查询,我们今天介绍分页查询,分页查询是返回到匹配文档的游标,能够任意改动查询限制.跳跃.和排序顺序的功能.…

//...此处省略了import... /** * Created by shenzhigang on 4/15/16. */ public class Main { public static void main(String[] args) { Datastore datastore; final Morphia morphia = new Morphia(); morphia.mapPackage("com.bdb.datatypes.common.po"); datastore…

1.查询所有 @Test public void query() throws Exception { final Query<Employee> query = datastore.createQuery(Employee.class); final List<Employee> list = query.asList(); list.forEach(e -> Console.log("{}", e)); } 输出: Employee(id=5bcef2…

1.filter morphia语法: query.filter("price >=", 1000); mongodb语法: { price: { $gte: 1000 } } 操作符:org.mongodb.morphia.query.FilterOperator 2.field…

文档示例Account的其中一条记录: // collection: Account { "_id" : ObjectId("5843e38e535f3708f759b25b"), "memberId" : ObjectId("5843e38e535f3708f759b25a"), "accountType" : "MEMBER", "money" : NumberL…

1.引入pom <dependency> <groupId>org.mongodb.morphia</groupId> <artifactId>morphia</artifactId> <version>1.3.2</version> </dependency> 2.创建Entity类 @Entity() public class Commodity { @Id private ObjectId id; @In…

@Entity("bands") public class Band { @Id ObjectId id; String name; String genre; @Reference Distributor distributor; @Reference("catalog") List<Song> songs = new ArrayList<Song>(); @Embedded List<String> members = new…

package com.lolaage.dals.dbfactory.mongodb; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.List; import com.mongodb.*; import org.apache.log4j.Logger; import com.lolaage.config.Configure; import com.lolaage.config.…