Spring Boot教程第8篇:整合mongodb

这篇文章主要介绍springboot如何整合mongodb。

准备工作

环境依赖

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

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<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。

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

mongodb设置了密码,这样配置:

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

定义一个简单的实体

mongodb

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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

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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

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@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

参考资料

accessing-data-mongodb

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