如何在 Spring 引導應用程序中禁用 MongoDB 在啟動時建立連接？

Question

我有一個 Spring 引導應用程序，它有兩種不同的數據庫實現，一種是 SQL，一種是 NO-SQL (MongoDB)。 SQL 實現是默認實現，我目前沒有使用 NO-SQL 實現。 但是，應用程序嘗試連接到 MongoDB 服務器，如果不可用，則會顯示錯誤。

我嘗試了以下方法：

    SpringBootApplication(exclude = {
        MongoAutoConfiguration.class,
        MongoDataAutoConfiguration.class
    })

但是，在這種情況下，我收到以下錯誤：

    Field operations in ...mongodb.CustomThingRepositoryImpl required a bean of type 'org.springframework.data.mongodb.core.MongoOperations' that could not be found.

The injection point has the following annotations:

        - @org.springframework.beans.factory.annotation.Autowired(required=true)
    
    Action:
    
    Consider defining a bean of type 'org.springframework.data.mongodb.core.MongoOperations' in your configuration.

我的 MongoDB 存儲庫類如下所示：

    public interface SpringDataMongoThingRepository extends MongoRepository<ThingDocument, String>,
            CustomThingRepository<ThingDocument, String> {
    }

    public interface CustomThingRepository<T, ID> {
    
        [...]
    
        <S extends T> S save(S entity);
    
        void deleteById(ID id);
    }

    @Component
    public class CustomThingRepositoryImpl<T, ID> implements CustomThingRepository<T, ID> {
    
        @Autowired
        private MongoOperations operations;
        
        @Autowired
        private ThingDataStorageProcessor thingDataStorageProcessor;
        [...]


    @Component
    public class ThingDataStorageProcessor {
    
        @Autowired
        private GridFsOperations gridFsOperations;
        [...]

我嘗試提供 MongoOperations 和 GridFsOperations 的虛擬實現，但仍然出現錯誤：

    Description:
    
    A component required a bean named 'mongoTemplate' that could not be found.
    
    
    Action:
    
    Consider defining a bean named 'mongoTemplate' in your configuration.

我怎樣才能至少防止 MongoDB 在啟動時連接？

Answer 1

這對我有用：

@Repository
@ConditionalOnProperty(prefix = "spring.data.mongodb", name = "uri")
public interface SpringDataMongoThingRepository...