Flask接口签名sign原理与实例代码浅析
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2023-02-16
如何优雅的进行Spring整合MongoDB详解
前言
本文重点是要将mongodb与spring整合到项目中去,在实践中发现问题,追踪问题,然后解决问题。下面话不多说了,来一起看看详细的介绍吧。
一、准备
Maven、Spring(spring-data-mongodb)
spring Data for MongoDB是Spring Data的一个子模块。 目标是为mongodb提供一个相近的一致的基于Spring的编程模型。
Spring Data for MongoDB核心功能是映射POJO到Mongo的DBCollection中的文档,并且提供Repository 风格数据访问层。
二、特性
MongoDB的提供了一个面向文档存储,操作起来比较简单和容易。
你可以在MongoDB记录中设置任何属性的索引 (如:FirstName="Ning",Address="Beijing")来实现更快的排序。
你可以通过本地或者网络创建数据镜像,这使得MongoDB有更强的扩展性。
如果负载的增加(需要更多的存储空间和更强的处理能力) ,它可以分布在计算机网络中的其他节点上这就是所谓的分片。
Mongo支持丰富的查询表达式。查询指令使用jsON形式的标记,可轻易查询文档中内嵌的对象及数组。
MongoDb 使用update()命令可以实现替换完成的文档(数据)或者一些指定的数据字段 。
Mongodb中的Map/reduce主要是用来对数据进行批量处理和聚合操作。
Map和Reduce。Map函数调用emit(key,value)遍历集合中所有的记录,将key与value传给Reduce函数进行处理。
Map函数和Reduce函数是使用javascript编写的,并可以通过db.runCommand或mapreduce命令来执行MapReduce操作。
GridFS是MongoDB中的一个内置功能,可以用于存放大量小文件。
MongoDB允许在服务端执行脚本,可以用javascript编写某个函数,直接在服务端执行,也可以把函数的定义存储在服务端,下次直接调用即可。
MongoDB支持各种编程语言:RUBY,python,JAVA,C++,php,C#等多种语言。
三、依赖包
spring 相关依赖
四、集成MongoDB
【注:MongoDB添加权限管理请参见我的这篇文章:MongDB开启权限认证】
mongodb.properties
mongo.hostport=172.16.4.166:27017
mongo.dbname=ad_api_count
mongo.username=hehaitao
mongo.password=hehaitao
mongo.connectionsPerHost=8
mongo.threadsAllowedToBlockForConnectionMultiplier=4
#\u8FDE\u63A5\u8D85\u65F6\u65F6\u95F4
mongo.connectTimeout=1000
#\u7B49\u5F85\u65F6\u95F4
mongo.maxWaitTime=1500
mongo.autoConnectRetry=true
mongo.socketKeepAlive=true
#Socket\u8D85\u65F6\u65F6\u95F4
mongo.socketTimeout=1500
mongo.slaveOk=true
mongoDB.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context" xmlns:mongo="http://springframework.org/schema/data/mongo" xsi:schemaLocation="http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-3.1.xsd http://springframework.org/schema/data/mongo http://springframework.org/schema/data/mongo/spring-mongo-1.0.xsd http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-3.1.xsd"> connections-per-host="${mongo.connectionsPerHost}" threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}" connect-timeout="${mongo.connectTimeout}" max-wait-time="${mongo.maxWaitTime}" auto-connect-reqzjBrtry="${mongo.autoConnectRetry}" socket-kehttp://ep-alive="${mongo.socketKeepAlive}" socket-timeout="${mongo.socketTimeout}" slave-ok="${mongo.slaveOk}" write-number="1" write-timeout="0" write-fsync="true"/> dbname="${mongo.dbname}" username="${mongo.username}" password="${mongo.password}" mongo-ref="mongo" />
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:context="http://springframework.org/schema/context"
xmlns:mongo="http://springframework.org/schema/data/mongo"
xsi:schemaLocation="http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context-3.1.xsd
http://springframework.org/schema/data/mongo
http://springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans-3.1.xsd">
connections-per-host="${mongo.connectionsPerHost}" threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}" connect-timeout="${mongo.connectTimeout}" max-wait-time="${mongo.maxWaitTime}" auto-connect-reqzjBrtry="${mongo.autoConnectRetry}" socket-kehttp://ep-alive="${mongo.socketKeepAlive}" socket-timeout="${mongo.socketTimeout}" slave-ok="${mongo.slaveOk}" write-number="1" write-timeout="0" write-fsync="true"/> dbname="${mongo.dbname}" username="${mongo.username}" password="${mongo.password}" mongo-ref="mongo" />
connections-per-host="${mongo.connectionsPerHost}"
threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
connect-timeout="${mongo.connectTimeout}"
max-wait-time="${mongo.maxWaitTime}"
auto-connect-reqzjBrtry="${mongo.autoConnectRetry}"
socket-kehttp://ep-alive="${mongo.socketKeepAlive}"
socket-timeout="${mongo.socketTimeout}"
slave-ok="${mongo.slaveOk}"
write-number="1"
write-timeout="0"
write-fsync="true"/>
dbname="${mongo.dbname}" username="${mongo.username}" password="${mongo.password}" mongo-ref="mongo" />
dbname="${mongo.dbname}"
username="${mongo.username}"
password="${mongo.password}"
mongo-ref="mongo" />
spring-contex.xml
xmlns:context="http://springframework.org/schema/context" xmlns:tx="http://springframework.org/schema/tx" xmlns:aop="http://springframework.org/schema/aop" xmlns:task="http://springframework.org/schema/task" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-3.1.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-3.1.xsd http://springframework.org/schema/tx http://springframework.org/schema/tx/spring-tx.xsd http://springframework.org/schema/aop http://springframework.org/schema/aop/spring-aop-3.1.xsd http://springframework.org/schema/task http://springframework.org/schema/task/spring-task-3.1.xsd">
xmlns:context="http://springframework.org/schema/context"
xmlns:tx="http://springframework.org/schema/tx"
xmlns:aop="http://springframework.org/schema/aop"
xmlns:task="http://springframework.org/schema/task"
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans-3.1.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context-3.1.xsd
http://springframework.org/schema/tx
http://springframework.org/schema/tx/spring-tx.xsd
http://springframework.org/schema/aop
http://springframework.org/schema/aop/spring-aop-3.1.xsd
http://springframework.org/schema/task http://springframework.org/schema/task/spring-task-3.1.xsd">
五、代码实现
基础实现MongoDBService
/**
* File Name : MongoDBService.java
* Package : com.lutongnet.ad.service
* Description : TODO
* Author : zhangfj
* Date : 2012-11-29
* Version : V1.0
*/
package com.lutong.cps.schedule.service.fj;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Service;
/**
* @author zhangfj
*
*/
@Service("mongoDBService")
public class MongoDBService
{
/*@Resource(name = "mongoTemplate")
protected MongoTemplate mongoTemplate;*/
/**
*
* @param query
* @param entityClass
* @return T
*/
public
{
ApplicationContext context=new ClassPathXmlApplicationContext("mongoDB.xml");
MongoTemplate mongoTemplate= (MongoTemplate) context.getBean("mongoTemplate");
// 可以直接调用
return mongoTemplate.findOne(query, entityClass);
}
}
继承类UserAdCountService
/**
* File Name : UserAdCountService.java
* Package : com.lutongnet.ad.service
* Description : TODO
* Author : zhangfj
* Date : 2012-11-29
* Version : V1.0
*/
package com.lutong.cps.schedule.service.fj;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Service;
import com.lutong.cps.schedule.entity.UserAdCount;
/**
* @author zhangfj
*
*/
@Service("userAdCountService")
public class UserAdCountService extends MongoDBService
{
/**
* 获取单个广告的观看次数,查询不到则返回0
*
* @param adCode
* @return int
*/
public int getUserAdCount(UserAdCount adCode)
{
Criteria criteria = new Criteria();
criteria.andOperator(Criteria.where("userAd").is(adCode.getUserAd()),
Criteria.where("adCode").is(adCode.getAdCode()),
Criteria.where("countDate").is(adCode.getCountDate()));
Query query = new Query(criteria);
UserAdCount result = findOne(query, UserAdCount.class);
if (null != result)
{
return result.getTimesCount();
}
return 0;
}
}
实体类UserAdCount
package com.lutong.cps.schedule.entity;
import java.util.Date;
import org.springframework.data.annotation.PersistenceConstructor;
import org.springframework.data.mongodb.core.mapping.Document;
/**
* mongo专用统计单个用户的单个广告观看次数
* @author cancer
*
*/
@Document(collection="userAdCount")
public class UserAdCount
{
private int timesCount;
/**
* 用户账号
*/
private String userAd;
private String adCode;
private String countDate;
private Date expireAt;
@PersistenceConstructor
public UserAdCount(int timesCount, String userAd,String adCode,String countDate,Date expireAt)
{
this.timesCount = timesCount;
this.userAd = userAd;
this.adCode = adCode;
this.countDate = countDate;
this.expireAt = expireAt;
}
public UserAdCount(String userAd,String adCode,String countDate)
{
this.userAd = userAd;
this.adCode = adCode;
this.countDate = countDate;
}
public UserAdCount(String userAd,String adCode,String countDate,Date expireAt)
{
this.userAd = userAd;
this.adCode = adCode;
this.countDate = countDate;
this.expireAt = expireAt;
}
public UserAdCount(String countDate)
{
this.countDate = countDate;
}
public int getTimesCount()
{
return timesCount;
}
public void setTimesCount(int timesCount)
{
this.timesCount = timesCount;
}
public String getUserAd()
{
return userAd;
}
public void setUserAd(String userAd)
{
this.userAd = userAd;
}
public String getAdCode()
{
rqzjBreturn adCode;
}
public void setAdCode(String adCode)
{
this.adCode = adCode;
}
public String getCountDate() {
return countDate;
}
public void setCountDate(String countDate) {
this.countDate = countDate;
}
public Date getExpireAt() {
return expireAt;
}
public void setExpireAt(Date expireAt) {
this.expireAt = expireAt;
}
}
最后写一个测试类来测试下
import java.util.List;
import javax.annotation.Resource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.acts.web.modules.mark.model.Users;
import com.lutong.cps.schedule.service.fj.UserAdCountService;
@ContextConfiguration({ "classpath:spring-context.xml",
"classpath:mongoDB.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class UserTest {
@Resource(name = "userAdCountService")
private UserAdCountService userAdCountService;
@Test
public void testDao() {
try {
UserAdCount userAdCount = new UserAdCount("hehaitao", "pos001",
DateTime.now().toString("yyyy-MM-dd"));
int count = userAdCountService
.getUserAdCount(userAdCount);
System.out.println(count);
} catch (Exception e) {
e.printStackTrace();
}
}
}
总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对我们的支持。
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