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详解springboot整合mongodb

2024-07-13 10:07:32
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这篇文章主要介绍springboot如何整合MongoDB。

准备工作

  1. 安装 MongoDB
  2. jdk 1.8
  3. maven 3.0
  4. idea

环境依赖

在pom文件引入spring-boot-starter-data-mongodb依赖:

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

数据源配置

如果mongodb端口是默认端口,并且没有设置密码,可不配置,sprinboot会开启默认的。

spring.data.mongodb.uri=mongodb://localhost:27017/springboot-db

mongodb设置了密码,这样配置:

spring.data.mongodb.uri=mongodb://name:pass@localhost:27017/dbname

定义一个简单的实体

mongodb

package com.forezp.entity;import org.springframework.data.annotation.Id;public class Customer {  @Id  public String id;  public String firstName;  public String lastName;  public Customer() {}  public Customer(String firstName, String lastName) {    this.firstName = firstName;    this.lastName = lastName;  }  @Override  public String toString() {    return String.format(        "Customer[id=%s, firstName='%s', lastName='%s']",        id, firstName, lastName);  }}

数据操作dao层

public interface CustomerRepository extends MongoRepository<Customer, String> {  public Customer findByFirstName(String firstName);  public List<Customer> findByLastName(String lastName);}

写一个接口,继承MongoRepository,这个接口有了几本的CURD的功能。如果你想自定义一些查询,比如根据firstName来查询,获取根据lastName来查询,只需要定义一个方法即可。注意firstName严格按照存入的mongodb的字段对应。在典型的Java的应用程序,写这样一个接口的方法,需要自己实现,但是在springboot中,你只需要按照格式写一个接口名和对应的参数就可以了,因为springboot已经帮你实现了。

测试

@SpringBootApplicationpublic class SpringbootMongodbApplication implements CommandLineRunner {  @Autowired  private CustomerRepository repository;  public static void main(String[] args) {    SpringApplication.run(SpringbootMongodbApplication.class, args);  }  @Override  public void run(String... args) throws Exception {    repository.deleteAll();    // save a couple of customers    repository.save(new Customer("Alice", "Smith"));    repository.save(new Customer("Bob", "Smith"));    // fetch all customers    System.out.println("Customers found with findAll():");    System.out.println("-------------------------------");    for (Customer customer : repository.findAll()) {      System.out.println(customer);    }    System.out.println();    // fetch an individual customer    System.out.println("Customer found with findByFirstName('Alice'):");    System.out.println("--------------------------------");    System.out.println(repository.findByFirstName("Alice"));    System.out.println("Customers found with findByLastName('Smith'):");    System.out.println("--------------------------------");    for (Customer customer : repository.findByLastName("Smith")) {      System.out.println(customer);    }  }

在springboot的应用程序,加入测试代码。启动程序,控制台打印了:

Customers found with findAll(): ——————————- Customer[id=58f880f589ffb696b8a6077e, firstName='Alice', lastName='Smith'] Customer[id=58f880f589ffb696b8a6077f, firstName='Bob', lastName='Smith'] Customer found with findByFirstName(‘Alice'): ——————————– Customer[id=58f880f589ffb696b8a6077e, firstName='Alice', lastName='Smith'] Customers found with findByLastName(‘Smith'): ——————————– Customer[id=58f880f589ffb696b8a6077e, firstName='Alice', lastName='Smith'] Customer[id=58f880f589ffb696b8a6077f, firstName='Bob', lastName='Smith']

测试通过。

源码下载:https://github.com/forezp/SpringBootLearning

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持VeVb武林网。


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