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(spring-data-jpa-extra
use spring data jpa more comfortable
I love spring-data-jpa, she set my hands free, crud methods are boring! However she is not perfect on dynamic native query and her return type must be an entity, although she provide us a specification solution, but i think it's heavy and not easy to use.
spring-data-jpa-extra comes to solve three problem:
- dynamic native query support like mybatis
- return type can be anything
- no code, just sql
Example
- first add ComponentScan
by java bean
@ComponentScan({"com.slyak","your.base.package"})
by xml
<context:component-scan base-package="com.slyak,your.base.package"/>
- second extends GenericJpaRepository instead of JpaRepository
public interface SampleRepository extends GenericJpaRepository<Sample, Long> {
@TemplateQuery
Page<Sample> findByContent(@Param("content")String content, Pageable pageable);
@TemplateQuery
CustomVO findCustomVO(@Param("id")Long id);
}
-
third create a file named Sample.sftl in your classpath:/sqls/ (you can change this path by setting placeholder spring.jpa.template-location)
- *.sftl naming rule:
{EntityName}.sftl,@Entity("{EntityName}"), a simple class name will be used as EntityName if not set.
- *.sftl naming rule:
-
In version >=2.0.0.RELEASE , new template 'sftl' take place of xml (xml is complex, but it is also supported).
sftl is a ftl template mixed with sqls. The template will be simplified as below. It can be recognized in Intellij IDEA , follow these steps:
settings->Editor->File Types , find "Freemarker Template" and register a new type named '*.sftl',choose it's 'Template Data Language' such as 'MYSQL'.
--findByContent
SELECT * FROM t_sample WHERE 1=1
<#if content??>
AND content LIKE :content
</#if>
--findCustomVO
SELECT id,name as viewName FROM t_sample WHERE id=:id
How to use?
you can use it by using source code or adding a maven dependency
notice: if the spring-data-jpa version >= 1.11.x (spring-boot version >= 1.5.x) please use 2.1.x.RELEASE .
notice: if you are using spring-boot 2.0+ or spring5 , please use the latest version 3.0.0.RELEASE, spring version, spring-data-jpa-extra version, :----------:, :-------------:, spring 3 (spring-boot 1.5.x), 2.1.x.RELEASE, spring 4 (spring-boot 2.0.x), 3.0.0.RELEASE, ```xml
com.slyak
spring-data-jpa-extra
2.1.2.RELEASE
config with annotation
```java
@EnableJpaRepositories(basePackages = "your.packages", repositoryBaseClass = GenericJpaRepositoryImpl.class, repositoryFactoryBeanClass = GenericJpaRepositoryFactoryBean.class)
or with xml
<jpa:repositories base-package="your.packages" repository-base-class="com.slyak.spring.jpa.GenericJpaRepositoryImpl" repository-factory-bean-class="com.slyak.spring.jpa.GenericJpaRepositoryFactoryBean"/>
Notice: if you are using spring-boot, the springboot-starter-jpa-extra should be the best choice!
2 Minute Tutorial
Template Query
Methods annotated with @TemplateQuery tells QueryLookupStrategy to look up query by content,this is often used by dynamic query.
Template Query Object
Object annotated with @TemplateQueryObject tells content process engine render params provided by object properties.
Entity Assemblers
Entity assemblers can assembler entity with other entities, such as one to many relation or one to one relation.
More Useful Methods (eg: mget togglestatus fakedelete)
//batch get items and put the result into a map
Map<ID, T> mget(Collection<ID> ids);
//get items one by one for cache
Map<ID, T> mgetOneByOne(Collection<ID> ids);
//get items one by one for cache
List<T> findAllOneByOne(Collection<ID> ids);
//toggle entity status if it has a Status property
void toggleStatus(ID id);
//set entity status to Status.DELETED if it has a Status property
void fakeDelete(ID... id);
TODO List
- More types of content support (now freemarker)
- More JPA comparison support (now hibernate)
- Performance test and do some optimization
- More other useful features
- Change to the latest spring-data-jpa version
Change Log
How to use in old version ( <2.0 )
old version guide