JarCasting
jpa-spec
Inspired by Legacy Hibernate Criteria Queries, while this should be considered deprecated vs JPA APIs,
but it still productive and easily understandable. Build on Spring Data JPA and simplify the dynamic query process.
Features
- Compatible with Spring Data JPA and JPA 2.1 interface.
- Equal/NotEqual/Like/NotLike/In/NotIn support multiple values, Equal/NotEqual support Null value.
- Each specification support join query(left joiner).
- Support custom specification.
- Builder style specification creator.
- Support pagination and sort builder.
Docs
| English Version | Chinese Version |
|---|---|
| Latest | 最新 |
| 3.2.5 | 3.2.5_cn |
| 3.2.1 | 3.2.1_cn |
| 3.1.0 | 3.1.0_cn |
| 3.0.0 | 3.0.0_cn |
Gradle
repositories {
jcenter()
}
dependencies {
implementation 'com.github.wenhao:jpa-spec:3.2.5'
}
Maven
<dependency>
<groupId>com.github.wenhao</groupId>
<artifactId>jpa-spec</artifactId>
<version>3.2.5</version>
</dependency>
Build
./gradlew clean build
Specification By Examples:
Each specification support three parameters:
- condition: if true(default), apply this specification.
- property: field name.
- values: compare value with model, eq/ne/like support multiple values.
General Example
each Repository class should extends from two super class JpaRepository and JpaSpecificationExecutor.
public interface PersonRepository extends JpaRepository<Person, Long>, JpaSpecificationExecutor<Person> {
}
public Page<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.eq(StringUtils.isNotBlank(request.getName()), "name", request.getName())
.gt(Objects.nonNull(request.getAge()), "age", 18)
.between("birthday", new Date(), new Date())
.like("nickName", "%og%", "%me")
.build();
return personRepository.findAll(specification, new PageRequest(0, 15));
}
Equal/NotEqual Example
find any person nickName equals to "dog" and name equals to "Jack"/"Eric" or null value, and company is null.
Test: EqualTest.java and NotEqualTest.java
public List<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.eq("nickName", "dog")
.eq(StringUtils.isNotBlank(request.getName()), "name", "Jack", "Eric", null)
.eq("company", null) //or eq("company", (Object) null)
.build();
return personRepository.findAll(specification);
}
In/NotIn Example
find any person name in "Jack" or "Eric" and company not in "ThoughtWorks" or "IBM".
Test: InTest.java
public List<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.in("name", request.getNames())
.notIn("company", Arrays.asList("ThoughtWorks", "IBM"))
.build();
return personRepository.findAll(specification);
}
Comparison Example
Support any comparison class which implements Comparable interface, find any people age bigger than 18.
Test: GreatThanTest.java
public List<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.gt(Objects.nonNull(request.getAge()), "age", 18)
.lt("birthday", new Date())
.build();
return personRepository.findAll(specification);
}
Between Example
find any person age between 18 and 25, birthday between someday and someday.
Test: BetweenTest.java
public List<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.between(Objects.nonNull(request.getAge(), "age", 18, 25)
.between("birthday", new Date(), new Date())
.build();
return personRepository.findAll(specification);
}
Like/NotLike Example
find any person name like %ac% or %og%, company not like %ec%.
Test: LikeTest.java and NotLikeTest.java
public Page<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.like("name", "ac", "%og%")
.notLike("company", "ec")
.build();
return personRepository.findAll(specification);
}
Or
support or specifications.
Test: OrTest.java
public List<Phone> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>or()
.like("name", "%ac%")
.gt("age", 19)
.build();
return phoneRepository.findAll(specification);
}
Mixed And and Or
support mixed and and or specifications.
Test: AndOrTest.java
public List<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.like("name", "%ac%")
.predicate(Specifications.or()
.lt("age", 19)
.gt("age", 25)
.build())
.build();
return personRepository.findAll(specification);
}
Join
each specification support association query as left join.
Test: JoinTest.java
@ManyToOne association query, find person name equals to "Jack" and phone brand equals to "HuaWei".
public List<Phone> findAll(SearchRequest request) {
Specification<Phone> specification = Specifications.<Phone>and()
.eq(StringUtils.isNotBlank(request.getBrand()), "brand", "HuaWei")
.eq(StringUtils.isNotBlank(request.getPersonName()), "person.name", "Jack")
.build();
return phoneRepository.findAll(specification);
}
@ManyToMany association query, find person age between 10 and 35, live in "Chengdu" street.
public List<Phone> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.between("age", 10, 35)
.eq(StringUtils.isNotBlank(jack.getName()), "addresses.street", "Chengdu")
.build();
return phoneRepository.findAll(specification);
}
Custom Specification
You can custom specification to do the @ManyToOne and @ManyToMany as well.
@ManyToOne association query, find person name equals to "Jack" and phone brand equals to "HuaWei".
Test: PredicateTest.java
public List<Phone> findAll(SearchRequest request) {
Specification<Phone> specification = Specifications.<Phone>and()
.eq(StringUtils.isNotBlank(request.getBrand()), "brand", "HuaWei")
.predicate(StringUtils.isNotBlank(request.getPersonName()), (root, query, cb) -> {
Path<Person> person = root.get("person");
return cb.equal(person.get("name"), "Jack");
})
.build();
return phoneRepository.findAll(specification);
}
@ManyToMany association query, find person age between 10 and 35, live in "Chengdu" street.
Test: PredicateTest.java
public List<Phone> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.between("age", 10, 35)
.predicate(StringUtils.isNotBlank(jack.getName()), ((root, query, cb) -> {
Join address = root.join("addresses", JoinType.LEFT);
return cb.equal(address.get("street"), "Chengdu");
}))
.build();
return phoneRepository.findAll(specification);
}
Sort
Test: SortTest.java
public List<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.eq(StringUtils.isNotBlank(request.getName()), "name", request.getName())
.gt("age", 18)
.between("birthday", new Date(), new Date())
.like("nickName", "%og%")
.build();
Sort sort = Sorts.builder()
.desc(StringUtils.isNotBlank(request.getName()), "name")
.asc("birthday")
.build();
return personRepository.findAll(specification, sort);
}
Pagination
find person by pagination and sort by name desc and birthday asc.
public Page<Person> findAll(SearchRequest request) {
Specification<Person> specification = Specifications.<Person>and()
.eq(StringUtils.isNotBlank(request.getName()), "name", request.getName())
.gt("age", 18)
.between("birthday", new Date(), new Date())
.like("nickName", "%og%")
.build();
Sort sort = Sorts.builder()
.desc(StringUtils.isNotBlank(request.getName()), "name")
.asc("birthday")
.build();
return personRepository.findAll(specification, PageRequest.of(0, 15, sort));
}
Virtual View
Using @org.hibernate.annotations.Subselect to define a virtual view if you don't want a database table view.
There is no difference between a view and a database table for a Hibernate mapping.
Test: VirtualViewTest.java
@Entity
@Immutable
@Subselect("SELECT p.id, p.name, p.age, ic.number " +
"FROM person p " +
"LEFT JOIN id_card ic " +
"ON p.id_card_id=ic.id")
public class PersonIdCard {
@Id
private Long id;
private String name;
private Integer age;
private String number;
// Getters and setters are omitted for brevity
}
public List<PersonIdCard> findAll(SearchRequest request) {
Specification<PersonIdCard> specification = Specifications.<PersonIdCard>and()
.gt(Objects.nonNull(request.getAge()), "age", 18)
.build();
return personIdCardRepository.findAll(specification);
}
Projection, GroupBy, Aggregation
Spring Data JPA doesn't support Projection(a little but trick), GroupBy and Aggregation,
furthermore, Projection/GroupBy/Aggregation are often used for complex statistics report, it might seem like overkill to use Hibernate/JPA ORM to solve it.
Alternatively, using virtual view and give a readable/significant class name to against your problem domain may be a better option.
Copyright and license
Copyright © 2016-2019 Wen Hao
Licensed under MIT License
