吴裕雄天生自然Spring BootSpring Boot整合MongoDB

    1．Spring对MongoDB的支持
    Spring对MongoDB的支持主要是通过Spring Data MongoDB实现的，Spring Data MongoDB为我们提供了如下功能。
    1）对象/文档映射注解

    2）MongoTemplate
    与JdbcTemplate一样，Spring Data MongoDB也我们提供了一个MongoTemplate，而MongoTemplate为我们提供了数据访问的方法。
    3）Repository 
    类似于Spring Data JPA，Spring Data MongoDB也我们提供了Repository的支持，使用方式和Spring Data JPA一样，示例如下：
public interface PersonRepository extends MongoRepository<Person, String>{
}

    Spring Boot对MongoDB的自动配置位于org.springframework.boot.autoconfigure.mongo包中。主要配置了数据库连接、MongoTemplate，我们可以在配置文件中使用以“spring.data.mongodb”为前缀的属性来配置MongoDB的相关信息。Spring Boot对MongoDB提供了一些默认属性，如默认端口号为27017、默认服务器为localhost、默认数据库为test、默认无用户名和无密码访问方式，并默认开启了对Repository的支持。因此，我们在Spring Boot应用中，只需引入spring-boot-starter-data-mongodb依赖即可按照默认配置操作MongoDB数据库。

在Spring Boot应用中，对MongoDB数据库的增删改查。
1．创建基于spring-boot-starter-data-mongodb依赖的Spring Boot Web应用ch6_8
2．配置application.properties文件
3．创建领域模型
4．创建数据访问接口
5．创建控制器层
6．运行

server.servlet.context-path=/ch6_8
spring.jackson.serialization.indent-output=true 

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mongo</groupId>
    <artifactId>SpringbootMongodb</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <!-- 声明项目配置依赖编码格式为 utf-8 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <fastjson.version>1.2.24</fastjson.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

package com.ch.ch6_8.domain;

import java.util.ArrayList;
import java.util.List;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.data.mongodb.core.mapping.Field;

@Document
public class Person {
    @Id
    private String pid;
    private String pname;
    private Integer page;
    private String psex;
    @Field("plocs")
    private List<Location> locations = new ArrayList<Location>();

    public Person() {
        super();
    }

    public Person(String pname, Integer page, String psex) {
        super();
        this.pname = pname;
        this.page = page;
        this.psex = psex;
    }

    public String getPid() {
        return pid;
    }

    public void setPid(String pid) {
        this.pid = pid;
    }

    public String getPname() {
        return pname;
    }

    public void setPname(String pname) {
        this.pname = pname;
    }

    public Integer getPage() {
        return page;
    }

    public void setPage(Integer page) {
        this.page = page;
    }

    public String getPsex() {
        return psex;
    }

    public void setPsex(String psex) {
        this.psex = psex;
    }

    public List<Location> getLocations() {
        return locations;
    }

    public void setLocations(List<Location> locations) {
        this.locations = locations;
    }
}

package com.ch.ch6_8.domain;

public class Location {
    private String locName;
    private String year;

    public Location() {
        super();
    }

    public Location(String locName, String year) {
        super();
        this.locName = locName;
        this.year = year;
    }

    public String getLocName() {
        return locName;
    }

    public void setLocName(String locName) {
        this.locName = locName;
    }

    public String getYear() {
        return year;
    }

    public void setYear(String year) {
        this.year = year;
    }
}

package com.ch.ch6_8.repository;

import java.util.List;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;
import com.ch.ch6_8.domain.Person;

public interface PersonRepository extends MongoRepository<Person, String> {
    Person findByPname(String pname);// 支持方法名查询

    @Query("{'psex':?0}") // JSON字符串
    List<Person> selectPersonsByPsex(String psex);
}

package com.ch.ch6_8.controller;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.ch.ch6_8.domain.Location;
import com.ch.ch6_8.domain.Person;
import com.ch.ch6_8.repository.PersonRepository;

@RestController
public class TestMongoDBController {
    @Autowired
    private PersonRepository personRepository;

    @RequestMapping("/save")
    public List<Person> save() {
        List<Location> locations1 = new ArrayList<Location>();
        Location loc1 = new Location("北京", "2019");
        Location loc2 = new Location("上海", "2018");
        locations1.add(loc1);
        locations1.add(loc2);

        List<Location> locations2 = new ArrayList<Location>();
        Location loc3 = new Location("广州", "2017");
        Location loc4 = new Location("深圳", "2016");
        locations2.add(loc3);
        locations2.add(loc4);

        List<Person> persons = new ArrayList<Person>();
        Person p1 = new Person("陈恒1", 88, "男");
        p1.setLocations(locations1);
        Person p2 = new Person("陈恒2", 99, "女");
        p2.setLocations(locations2);
        persons.add(p1);
        persons.add(p2);

        return personRepository.saveAll(persons);
    }

    @RequestMapping("/findByPname")
    public Person findByPname(String pname) {
        return personRepository.findByPname(pname);
    }

    @RequestMapping("/selectPersonsByPsex")
    public List<Person> selectPersonsByPsex(String psex) {
        return personRepository.selectPersonsByPsex(psex);
    }

    @RequestMapping("/updatePerson")
    public Person updatePerson(String oldPname, String newPname) {
        Person p1 = personRepository.findByPname(oldPname);
        if (p1 != null)
            p1.setPname(newPname);
        return personRepository.save(p1);
    }

    @RequestMapping("/deletePerson")
    public void updatePerson(String pname) {
        Person p1 = personRepository.findByPname(pname);
        personRepository.delete(p1);
    }
}

package com.ch.ch6_8;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Ch68Application {
    public static void main(String[] args) {
        SpringApplication.run(Ch68Application.class, args);
    }
}