title: Spring 访问 MongoDB
date: 2018-12-15 17:29:36
categories:
  - Java
  - 框架
  - Spring
  - Spring数据
tags:
  - Java
  - 框架
  - Spring
  - SpringBoot
  - MongoDB
permalink: /pages/db2a41/

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

spring.data.mongodb.host = localhost
spring.data.mongodb.port = 27017
spring.data.mongodb.database = test
spring.data.mongodb.username = root
spring.data.mongodb.password = root

import org.springframework.data.annotation.Id;

public class Customer {

    @Id
    public String id;

    public String firstName;

    public String lastName;

    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);
    }

}

import java.util.List;

import org.springframework.data.mongodb.repository.MongoRepository;

public interface CustomerRepository extends MongoRepository<Customer, String> {

    Customer findByFirstName(String firstName);
    List<Customer> findByLastName(String lastName);

}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DataMongodbApplication implements CommandLineRunner {

    @Autowired
    private CustomerRepository repository;

    public static void main(String[] args) {
        SpringApplication.run(DataMongodbApplication.class, args);
    }

    @Override
    public void run(String... args) {

        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);
        }
    }

}

Customers found with findAll():
-------------------------------
Customer(id=63d6157b265e7c5e48077f63, firstName=Alice, lastName=Smith)
Customer(id=63d6157b265e7c5e48077f64, firstName=Bob, lastName=Smith)

Customer found with findByFirstName('Alice'):
--------------------------------
Customer(id=63d6157b265e7c5e48077f63, firstName=Alice, lastName=Smith)
Customers found with findByLastName('Smith'):
--------------------------------
Customer(id=63d6157b265e7c5e48077f63, firstName=Alice, lastName=Smith)
Customer(id=63d6157b265e7c5e48077f64, firstName=Bob, lastName=Smith)