SpringBoot微服务 b2b2c 多用户商城系统（八）springboot整合mongodb

女爷i 2022-01-13 09:57 255阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

## 准备工作 ##

*  安装 MongoDB
 *  jdk 1.8
 *  maven 3.0
 *  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 ##

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 ##

@SpringBootApplication
    public 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);
            }
        }

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转载于:https://my.oschina.net/u/4045192/blog/3001020

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220113/ed4e7a3d547441cd8038f78cf25281b7.png