springboot随笔之四：springboot整合spring-data-jpa（mogodb）_spring data jpa和spring-boot-starter-data-mongodb

• springboot随笔之一：简易springboot项目编写
• springboot随笔之二：springboot中control实现
• springboot随笔之三：springboot整合spring-data-jpa（关系型数据库mysql）
• springboot随笔之四：springboot整合spring-data-jpa（nosql mogodb）

一、在mongodb中准备相应数据

1、创建数据库并创建对应可以访问的对应库的用户信息

2、创建对应collection，并插入相应的文档数据

二、结合前面的实例，项目中配置包依赖及数据源

1、jpa包依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        
         <!-- mongodb依赖 --> 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>

2、配置数据源

# mongodb 2.4以上版本支持uri配置（此处未设置用户名密码，mongodb默认不设置用户名密码）
spring.data.mongodb.uri=mongodb://admin:123456@localhost/test
#spring.data.mongodb.database=test
#spring.data.mongodb.host=127.0.0.1
#spring.data.mongodb.port=27017
#spring.data.mongodb.repositories.enabled=true
#spring.data.mongodb.username=admin
#spring.data.mongodb.password=123456

三、编写数据库表对应的实体类

package com.expample.springboot04.domain;
 
 
//与mongo collection对应的Entity类
 
/**
* ORM对象关系映射，即java 实体类和mongodb collection的映射关系：
* 类成员变量 -> collection字段，类名 -> collection名
**/
 
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.data.mongodb.core.mapping.Field;
import javax.persistence.Entity;
import javax.persistence.Id;
 
//注解实体类，springboot自动装载为bean
@Entity
@Document("student")
public class Student {
 
 // 指定主键字段，注意import是javax持久化的Id而非springboot annotation的Id
 // @Field("id")指定该主键名称为id，如果不添加此项注解的话，
 // 程序会认为private int id对应的是mongodb studdent集合中的objectid字段（该字段是mongodb中的默认主键）
 @Id
 @Field("id")
 private int id;
 private String name;
 private int age;
 
 // 默认构造方法
 public Student(){
 }
 
 // 有参构造方法
 public Student(int id, String name, int age){
     this.id = id;
     this.name = name;
     this.age = age;
 }
 
 public int getId() {
     return id;
 }
 
 public void setId(int id) {
     this.id = id;
 }
 
 public String getName() {
     return name;
 }
 
 public void setName(String name) {
     this.name = name;
 }
 
 public int getAge() {
     return age;
 }
 
 public void setAge(int age) {
     this.age = age;
 }
}
 

四、编写持久层

package com.expample.springboot04.dao;
 
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;
 
import com.expample.springboot04.domain.Student;
 
@Repository("studentDao")
public interface IStudentDao extends MongoRepository<Student, Integer> {
 
}

其中MongoRepository<Student, Integer>
Student表示数据库中表对应的实体类
Integer表示数据中表对应主键类型

Spring容器会根据@Repository("studentDao")创建对应的对象studentDao

五、编写业务层

package com.expample.springboot04.service;
 
import java.util.List;
 
import org.springframework.stereotype.Service;
 
import com.expample.springboot04.domain.Student;
 
@Service
public interface IStudentService {
 
	List<Student> findAllStudents();
}

package com.expample.springboot04.service.impl;
 
import java.util.List;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import com.expample.springboot04.dao.IStudentDao;
import com.expample.springboot04.domain.Student;
import com.expample.springboot04.service.IStudentService;
 
@Service("studentService")
public class StudentServiceImpl implements IStudentService {
 
	@Autowired
	private IStudentDao studentDao;
	@Override
	public List<Student> findAllStudents() {
		// TODO Auto-generated method stub
		return studentDao.findAll();
	}
 
}

六、完善控制器

package com.expample.springboot04.control;
 
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.expample.springboot04.domain.Student;
import com.expample.springboot04.service.IStudentService;
 
@RestController
@RequestMapping("/exampleControl")
public class ExampleControl {
	@Autowired
	private IStudentService studentService;
	@RequestMapping("/testExample")
	public String testExample() {
        return "testExample";
	}
	
	@RequestMapping("/showStudents")
	public List<Student> showStudents() {
		return studentService.findAllStudents();
	}
 
}

七、运行springboot启动类，浏览器测试：http://localhost:8000/test/exampleControl/showStudents

 

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