我想根据某些情况在Springboot Service类中加载数据库类型（Cassandra或MongoDB）。为此，我打算使用https://sivalabs.in/2016/03/how-springboot-autoconfiguration-magic/中提到的@Conditional注释。

就我而言，我正在扩展org.springframework.stereotype。存储库界面，用于创建如下所示的存储库。

在服务类中，如何基于application.yml中的配置文件或配置获取Cassandra Type或Mongo Type的实例？

谢谢 灰烬

@Repository
public interface CartCassandraRepository extends CrudRepository<com.cassandra.Cart,String> {

}

@Repository
public interface MongoCassandraRepository extends CrudRepository<com.mongo.Cart,String> {

}

这是我的com.cassandra.Cart.java

import org.springframework.data.cassandra.core.cql.PrimaryKeyType;
import org.springframework.data.cassandra.core.mapping.CassandraType;
import org.springframework.data.cassandra.core.mapping.Column;
import org.springframework.data.cassandra.core.mapping.PrimaryKeyColumn;
@Table("Cart")
public class Cart  {


    @PrimaryKeyColumn(ordinal = 0,type = PrimaryKeyType.PARTITIONED)
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected String id;

    @PrimaryKeyColumn(ordinal = 1,type = PrimaryKeyType.PARTITIONED)
    private String userId;

    @PrimaryKeyColumn(ordinal = 2,type = PrimaryKeyType.CLUSTERED,ordering = Ordering.DESCENDING)
    private String productId;
}

这是我的com.mongo.Cart.java

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

@Document(collection = "Cart")
public class Cart  {

    @Id
    protected String id;

    @Indexed(unique = true)
    @Field(value = "UserId")
    private String userId;

    @Field(value = "ProductId")
    private String productId;
}

这是服务类

public class CartServiceImpl{

    @Autowired
    CassandraCartRepository cassandraCartRepository;

    @Autowired
    MongoCartRepository mongoCartRepository;

    public Cart save(CartDTO cart){
        // based on configuration or profile load com.mongo.Cart or com.cassandra.Cart
        // based on the configuration or profile do mongoCartRepository.save(cart) or cassandraCartRepository.save(cart)
    }
}