springboot集成MongoDB

1、添加MongoDB依赖，版本号根据springboot来，一把都会有默认的

<!-- Spring Data MongoDB -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

2、配置连接信息

spring.data.mongodb.uri=mongodb://localhost:27017/your_database_name

3、创建实体类

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document(collection = "products")
public class Product {
    @Id
    private String id;
    private String name;
    private double price;
    private String description;

    // 构造函数、Getter和Setter等省略...
}

4、继承 MongoRepository 接口

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

public interface ProductRepository extends MongoRepository<Product, String> {
  List<Product> findByName(String name);
}

5、示例代码

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class ProductService {

    private final ProductRepository productRepository;

    @Autowired
    public ProductService(ProductRepository productRepository) {
        this.productRepository = productRepository;
    }

    // 创建或更新产品
    public Product saveProduct(Product product) {
        return productRepository.save(product);
    }

    // 根据ID查找产品
    public Product findProductById(String id) {
        return productRepository.findById(id).orElse(null);
    }

    // 根据name查找产品
    public List<Product> findProductById(String name) {
        return productRepository.findByName(name).orElse(null);
//        return productRepository.findByNameAndId(name, id).orElse(null);
//     return productRepository.findByNameAndPriceBetweenOrderByTsDesc(name, startPrice,  endPrice)
    }

    // 获取所有产品
    public List<Product> getAllProducts() {
        return productRepository.findAll();
    }

    // 根据ID删除产品
    public void deleteProductById(String id) {
        productRepository.deleteById(id);
    }
}

6、测试

public class Main {

    public static void main(String[] args) {
        // 假设已经有一个Spring应用程序，并且已经注入了ProductService
        ProductService productService = ... // 注入ProductService

        // 创建一个产品
        Product product1 = new Product();
        product1.setName("Product 1");
        product1.setPrice(19.99);
        product1.setDescription("This is product 1.");
        Product savedProduct1 = productService.saveProduct(product1);

        // 查询产品
        Product foundProduct = productService.findProductById(savedProduct1.getId());
        System.out.println("Found product: " + foundProduct);

        // 获取所有产品
        List<Product> allProducts = productService.getAllProducts();
        System.out.println("All products: " + allProducts);

        // 删除产品
        productService.deleteProductById(savedProduct1.getId());
    }
}