使用MongoDB+Jpa操作数据库
使用MongoDB+Jpa操作数据库
SpringData还提供了对多种NoSQL数据库的支持,包括MongoDB;neo4j和redis.他不仅支持自动化的repository,还支持基于模板的数据访问和映射注解.下面是一个Spring通过Jpa操作MongoDB数据库的小Demo:
数据的结构如图所示:
相关代码如下:
StuController:
import com.demo.jpamongodb.dao.StudentRepository;
import com.demo.jpamongodb.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Optional;
@RestController
public class StuController {
@Autowired
private StudentRepository studentRepository;
@RequestMapping("/getStuByName/{name}")
public Optional getSchool1() {
Optional stu = studentRepository.findById(1L);
return stu;
}
} SchoolReponsitory
package com.demo.jpamongodb.dao;
import com.demo.jpamongodb.entity.School;
import org.springframework.data.mongodb.repository.MongoRepository;
public interface SchoolReponsitory extends MongoRepository<School,Long> {
School findSchoolByName(String name);
}StudentRepository
import com.demo.jpamongodb.entity.Student;
import org.springframework.data.mongodb.repository.MongoRepository;
public interface StudentRepository extends MongoRepository<Student, Long> {
Student findByName(String name);
}School
package com.demo.jpamongodb.entity;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.ToString;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import java.net.Proxy;
@Document
public class School {
@Id
private Long id;
private String name;
private String address;
public School() {
}
public School(Long id, String name, String address) {
this.id = id;
this.name = name;
this.address = address;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "School{" +
"id=" + id +
", name='" + name + '\'' +
", address='" + address + '\'' +
'}';
}
}
Student
package com.demo.jpamongodb.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
//@AllArgsConstructor
//@Data
//@ToString
@Document
public class Student {
@Id
private Long id;
private String name;
private Integer age;
private School shool;
public Student() {
}
public Student(Long id, String name, Integer age, School shool) {
this.id = id;
this.name = name;
this.age = age;
this.shool = shool;
}
public Long getId() {
return id;
}
public void setId(Long 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;
}
public School getShool() {
return shool;
}
public void setShool(School shool) {
this.shool = shool;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
", shool=" + shool +
'}';
}
}
application.properties
spring.data.mongodb.host=127.0.0.1
spring.data.mongodb.port=27017
spring.data.mongodb.database=test
spring.data.mongodb.username=test
spring.data.mongodb.password=123456
server.port=8787JpaMongodbApplicationTests
package com.demo.jpamongodb;
import com.demo.jpamongodb.dao.SchoolReponsitory;
import com.demo.jpamongodb.dao.StudentRepository;
import com.demo.jpamongodb.entity.School;
import com.demo.jpamongodb.entity.Student;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest
public class JpaMongodbApplicationTests {
@Autowired
private StudentRepository studentRepository;
@Autowired
private SchoolReponsitory schoolReponsitory;
@Test
public void contextLoads() {
}
/**
* 第一次单元测试
* - student实体没有加home属性
*
* @throws Exception
*/
@Test
public void insertStudentWithoutHome() throws Exception {
School school1 = schoolReponsitory.findSchoolByName("南京路中学");
School school2 = schoolReponsitory.findSchoolByName("北京路中学");
System.out.println(school1);
System.out.println(school2);
// schoolReponsitory.save(new School(1L,"南京路中学","南京路"));
studentRepository.save(new Student(1L, "小明", 30,school1));
// studentRepository.save(new Student(2L, "小红", 40,school1));
// studentRepository.save(new Student(3L, "小王", 50,school2));
}
/**
* 第二次单元测试
* - student实体加home属性
*
* @throws Exception
*/
@Test
public void insertStudentWitHome() throws Exception {
School school1 = schoolReponsitory.findSchoolByName("南京路中学");
School school2 = schoolReponsitory.findSchoolByName("北京路中学");
// studentRepository.save(new Student(4L, "tom", 30,school1,"1小区"));
// studentRepository.save(new Student(5L, "peter", 40,school1,"2小区"));
// studentRepository.save(new Student(6L, "joy", 50,school2,"3小区"));
}
/**
* 对查询结果打印
*/
@Test
public void findAll() {
List students = studentRepository.findAll();
students.forEach(student -> {
System.out.println(student);
});
}
// @Test
// public void insertSchool(){
// School school1 = School.builder().address("南京路").name("南京路中学").id(1L).build();
// School school2 = School.builder().address("北京路").name("北京路中学").id(2L).build();
//new School(1L,"南京路中学","南京路");
//
// schoolReponsitory.save(new School(1L,"南京路中学","南京路"));
// schoolReponsitory.save(school2);
//
// School school = schoolReponsitory.findSchoolByName("南京路中学");
// System.out.println(school);
// }
} pom.xml:
<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>4.0.0modelVersion>
<groupId>com.beacongroupId>
<artifactId>jpa-mongodbartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.0.3.RELEASEversion>
<relativePath/>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-configuration-processorartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-aopartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-thymeleafartifactId>
dependency>
<dependency>
<groupId>org.mongodbgroupId>
<artifactId>mongo-java-driverartifactId>
<version>3.8.0version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-data-mongodbartifactId>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>1.16.22version>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
project>演示效果为:(注意我们需要先往MongoDB中添加数据)
