spring data jpa 怎么使用泛型实现通用的dao类

2017-09-04 06:27:35 933 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Spring Data JPA用法详解 Spring Data JPA： JPA（Java Persistence API）即java持久化API，它的出现主要是为了简化持久层开发以及整合ORM技术，结束Hibernate、TopLink、JDO等ORM框架各自为营的局面。JPA是在吸收现有ORM框架的基础上发展而来，易于使用，伸缩性强。总的来说，JPA包括以下三方面的技术： ORM映射元数据：支持XML和注解两种元数据的形式，元数据描述对象和表之间的映射关系 API：操作实体对象来执行CRUD操作查询语言：通过面向对象而非面向数据库的阅读详情

最近在学习springboot，遇到一个问题就是想自己写个通用的dao类，spring一直报错。
定义如下接口没有问题

public interface Itest0901 extends JpaRepository<test0901,Integer>

但是定义如下接口就出错了

public interface InterDao<T, ID extends Serializable> extends JpaRepository<T,ID>

错误信息：

2017-09-04 18:16:18.231  INFO 9976 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'

2017-09-04 18:16:18.851  WARN 9976 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'interDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class java.lang.Object

...全文

Spring Boot整合Spring Data JPA详解 Spring Boot整合Spring Data JPA理解官方文档: Spring Data JPA 官方文档一、 Sping Data JPA 简介在此之前我们首先来认识一下，**Spring Data JPA** 是 Spring 基于 ORM 框架、JPA 规范的基础上封装的JPA 应用框架，底层使用了 Hibernate 的 JPA 技术实现，Spring Data JP... 阅读详情

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open_yu 2017-09-05

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问题解决了，下面将答案公布一下：接口添加@NoRepositoryBean注解使spring自动不实例化该bean 实现类添加@Service注解将该bean添加到spring中

浊酒焚 2017-09-04

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浊酒焚 2017-09-04

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要注意两点：1、BaseDao和继承的普通dao不能在同一包下；2、要导入泛型的包。
如图：

open_yu 2017-09-04

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2017-09-04 18:16:18.231  INFO 9976 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2017-09-04 18:16:18.851  WARN 9976 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'interDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class java.lang.Object
2017-09-04 18:16:18.853  INFO 9976 --- [           main] j.LocalContainerEntityManagerFactoryBean : Closing JPA

spring data jpa 怎么使用泛型实现通用的dao类

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