2023-02-20  阅读(342)
原文作者:方志鹏 原文地址:https://blog.csdn.net/forezp/category_6830966.html

准备工作

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

    @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);
    		}
    	}
    
    	

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

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参考资料

accessing-data-mongodb

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