数据库

mongodb在spring中的配置支持注解 @Configuration和xml的方式

MongoTemplate辅助类扩展了Mongo operations的生产效率，提供了document和pojo类型之间的转换

添加依赖到pom.xml

    org.springframework.data

    spring-data-mongodb

    1.1.0.RELEASE

你可以将日志级别设置成debug来查看更多的日志信息

log4j.category.org.springframework.data.document.mongodb=DEBUG

log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %40.40c:%4L - %m%n

app-mongodb.xml

    xmlns:context="http://www.springframework.org/schema/context" xmlns:mongo="http://www.springframework.org/schema/data/mongo"

    xsi:schemaLocation="http://www.springframework.org/schema/context

          http://www.springframework.org/schema/context/spring-context-3.0.xsd

          http://www.springframework.org/schema/data/mongo

          http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd

          http://www.springframework.org/schema/beans

          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

            threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"

            connect-timeout="${mongo.connectTimeout}"

            max-wait-time="${mongo.maxWaitTime}"

            auto-connect-retry="${mongo.autoConnectRetry}"

            socket-keep-alive="${mongo.socketKeepAlive}"

            socket-timeout="${mongo.socketTimeout}"

            slave-ok="${mongo.slaveOk}"

            write-number="1"

            write-timeout="0"

            write-fsync="true" />

　　Person.java

package com.dempe.summer.person.model;

import org.springframework.data.annotation.Id;

import org.springframework.data.mongodb.core.mapping.Document;

/**

 * @author: Zheng Dongping

 * @version 1.0 date: 2013-12-20

 */

@Document(collection = "person")

public class Person {

    @Id

    private String id;

    private String name;

    private Integer age;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

}

 How the '_id' field is handled in the mapping layer

mongoDB默认会为所有的document生成_id字段，MongoMappingConverter类有确定的规则去管理从java类到"_id"字段的映射，

当一个字段被@Id注解标注，或者这个字段的名字为id，那么这个字段将会为映射成"_id"

PersonRepository.javapackage com.dempe.summer.person.persist;

import java.util.List;

　PersonController.java

package com.dempe.summer.person.controller;

import java.util.List;

import javax.inject.Inject;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import com.dempe.summer.person.model.Person;

import com.dempe.summer.person.persist.PersonRepository;

/**

 * @author: Zheng Dongping

 * @version 1.0 date: 2013-12-20

 */

@Controller

@RequestMapping(value = "/person")

public class PersonController {

    @Inject

    PersonRepository repository;

    @RequestMapping(value = "/test")

    @ResponseBody

    public String testMongo() {

        // repository.deleteAll();

        Person person = new Person();

        person.setId("12234499");

        person.setName("dempe");

        person.setAge(3);

        repository.save(person);

        Person p = new Person();

        p.setId("2222");

        p.setName("dempe");

        p.setAge(4);

        repository.save(p);

        List person2List = repository.findByName("dempe");

        System.out.println("person2:" + person2List.get(0).getName() + person2List.size());

        return "success";

    }

}