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;@RestControllerpublic 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;@Documentpublic 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@Documentpublic 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=testspring.data.mongodb.username=testspring.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)@SpringBootTestpublic 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>
作者：Dream城堡
链接：https://www.jianshu.com/p/888fb759db98
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