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:
mog.gif
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<Student> getSchool1() {
Optional<Student> 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=8787
JpaMongodbApplicationTests
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<Student> 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:
<?xml version="1.0" encoding="UTF-8"?>
<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.beacon</groupId>
<artifactId>jpa-mongodb</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<!--数据库组件-->
<!--<dependency>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-starter-data-jpa</artifactId>-->
<!--</dependency>-->
<!--数据库组件-->
<!--<dependency>-->
<!--<groupId>mysql</groupId>-->
<!--<artifactId>mysql-connector-java</artifactId>-->
<!--</dependency>-->
<!--<dependency>-->
<!--<groupId>com.alibaba</groupId>-->
<!--<artifactId>druid</artifactId>-->
<!--<version>1.1.10</version>-->
<!--</dependency>-->
<!--//添加AOP-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<!-- Spring boot 引用Thymeleaf模板依赖包（Thymeleaf模板如果不适用，这里也可以不添加这段配置，Thymeleaf模板使用在下面会讲到） -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!--mongodb-->
<!--<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongodb-driver</artifactId>
<version>3.6.4</version>
</dependency>-->
<!-- https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver -->
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>3.8.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.22</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
演示效果为:(注意我们需要先往MongoDB中添加数据)
xiao.gif
