可以创建未映射到数据库表的域类吗? [英] Possible to create a domain class that is NOT mapped to a database table?

问题描述

我正在使用Grails 1.2.1.我正在将Java应用程序转换为Grails应用程序，并且我有一个Java对象，以为可以为其创建grails域.但是，该对象不依赖于基础数据库表.启动我的应用程序时，出现错误

I'm using Grails 1.2.1. I'm converting a Java app to a Grails app and I had a Java object that I thought I'd create a grails domain for. However, the object does not rely on an underlying database table. When I startup my app, I'm getting the error,

错误context.ContextLoader-上下文初始化失败 org.springframework.beans.factory.BeanCreationException:创建名称为'messageSource'的bean时出错:初始化bean失败；嵌套的异常是org.springframework.beans.factory.BeanCreationException:创建名称为'transactionManager'的bean时出错:设置bean属性'sessionFactory'时无法解析对bean'sessionFactory'的引用；嵌套的异常是org.springframework.beans.factory.BeanCreationException:创建名称为'sessionFactory'的bean时出错:调用init方法失败；嵌套的异常是org.hibernate.MappingException:无法确定类型:java.io.InputStream，在表:http_cache_response，对于列:[org.hibernate.mapping.Column(body)]"

"ERROR context.ContextLoader - Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageSource': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Could not determine type for: java.io.InputStream, at table: http_cache_response, for columns: [org.hibernate.mapping.Column(body)]"

我滥用域名了吗?这个对象应该只是src/groovy中的常规类吗?谢谢，-戴夫

Am I misusing the domain? Should this object just be a regular class in src/groovy? Thanks, - Dave

推荐答案

是的，域对象是特定于数据库的对象.在DDD意义上不属于域.

Yes, domain objects are specifically database-mapped objects. Not domain in the DDD sense.

取决于类是否为单例，它应该是服务还是src/groovy中的类.

Depending on if the class is a singleton or not it should either be a service or a class in src/groovy.

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