Spring Data JPAによるデータアクセス徹底入門 #jsug

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Spring Web 4 Spring MVC
Spring Boot
Developer
2 Spring Boot
Spring Cloud
Services
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Spring Cloud Microservices

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※ JPA 2.1(Java EE 7)

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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

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<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>2.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.12.Final</version>
</dependency>

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logging.level.org.hibernate.SQL=debug
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=
trace
<logger name="org.hibernate.SQL" level="DEBUG" />
<logger name="org.hibernate.type.descriptor.sql.BasicBinder"
level="TRACE" />
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※hibernate.show_sql=true

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spring.jpa.properties.hibernate.format_sql=true
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DB

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@Entity
public class Product {
@Id
private Integer id;
private String name;
// setter/getter
}

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NEW new
MANAGED
DETACHED
REMOVED

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ﬁnd()
persist() 1
remove() 1
merge()
detach()
ﬂush() DB
clear()
refresh() DB

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persist()
detach() 
clear()
merge()
remove()
flush()
flush()
refresh()
find() 
JPQL
detach() 
clear()

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EntityManager em = …;
// 1 2
Product product = em.find(Product.class, 1);
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select
product0_.id as id1_5_0_,
product0_.category_id as category4_5_0_,
product0_.name as name2_5_0_,
product0_.price as price3_5_0_,
product0_.vendor_id as vendor_i5_5_0_
from
product product0_
where
product0_.id=?
SQL

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Product product = new Product(“ ”, 100000L);
em.persist(product);
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insert
into
product
(category_id, name, price, vendor_id, id)
values
(?, ?, ?, ?, ?)

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// find() MANAGED
//
product.setName(" ");
// ( OK)
em.flush();
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select … from product product0_ where product0_.id=?
binding parameter [1] as [INTEGER] - [1]
update product
set category_id=?, name=?, price=?, vendor_id=?
where id=?
binding parameter [2] as [VARCHAR] - [ ]
binding parameter [3] as [BIGINT] - [100000]

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Product product = new Product();
product.setId(1);
product.setName(“ ");
// merge()
em.merge(product);
em.flush();
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update product
set category_id=?, name=?, price=?, vendor_id=?
where id=?
binding parameter [1] as [INTEGER] - [null]
binding parameter [2] as [VARCHAR] - [ ]
binding parameter [3] as [BIGINT] - [null]
binding parameter [4] as [INTEGER] - [null]
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Product mergedProduct = em.merge(product);
// MANAGED
assertTrue(em.contains(mergedProduct));
//
assertFalse(em.contains(product));

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// find() MANAGED
// REMOVED
em.remove(product);
// ( OK)
em.flush();
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delete from product where id=?

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// find() MANAGED
// REMOVED
em.remove(product);
// DETACHED
em.detach(product);
// DETACHED DB
em.flush();
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TypedQuery<Product> query = em.createQuery(
"SELECT p FROM Product p WHERE p.id = :id",
Product.class);
query.setParameter("id", 1);
Product product = query.getSingleResult();
"SELECT p FROM Product p WHERE p.id <= :maxId"
+ " ORDER BY p.id", Product.class);
query.setParameter("maxId", 5);
List<Product> list = query.getResultList();
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select
product0_.id as id1_5_,
product0_.category_id as category4_5_,
product0_.name as name2_5_,
product0_.price as price3_5_,
product0_.vendor_id as vendor_i5_5_
from
product product0_
where
product0_.id=?
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SELECT FROM [AS]
WHERE . <= :
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SELECT new com.example.demo.dto.CountDto(
od.product.id, COUNT(od))
FROM OrderDetail od GROUP BY od.product.id

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@Entity
…
@ManyToOne
@JoinColumn(name="vendor_id")
private Vendor vendor;
}
@Entity
public class Vendor {
…
}

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@Entity
…
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="vendor_id")
}

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select ( ) from product product0_
where product0_.id=?
select ( ) from vendor vendor0_
where vendor0_.id=?
@Entity public class Product {
@ManyToOne(fetch = FetchType.LAZY)
}
Product p = em.find(Product.class, 1);
Vendor v = p.getVendor();
String n = v.getName() // SELECT
2
SELECT

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em.getTransaction().begin();
em.getTransaction().rollback();
Vendor v = p.getVendor();
String n = v.getName(); //

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@Entity public class Product {
@ManyToOne(fetch = FetchType.EAGER)
}
Vendor v = p.getVendor(); //
select ( ) from product product0_
left outer join vendor vendor2_
on product0_.vendor_id=vendor2_.id
where product0_.id=?
1
SELECT

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// order_summary SELECT 1
List<OrderSummary> list = em.createQuery(
"SELECT os FROM OrderSummary os",OrderSummary.class)
.getResultList();
for (OrderSummary os : list) {
// order_detail
System.out.println(os);
for (OrderDetail od : os.getOrderDetailList()) {
// order_detail SELECT (N )
System.out.println(od);
}
}

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"SELECT os FROM OrderSummary os" +
" JOIN os.orderDetailList", OrderSummary.class)
.getResultList();
for (OrderSummary os : list) {
// order_detail
System.out.println(os);
for (OrderDetail od : os.getOrderDetailList()) {
// order_detail SELECT (N )
System.out.println(od);
}
}

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select
ordersumma0_.id as id1_3_,
ordersumma0_.customer_id as customer3_3_,
ordersumma0_.order_timestamp as order_ti2_3_
from
order_summary ordersumma0_
inner join
order_detail orderdetai1_
on ordersumma0_.id=orderdetai1_.summary_id
where
ordersumma0_.id=?
JOIN  
order_summary

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" JOIN FETCH os.orderDetailList" +
, OrderSummary.class)
.getResultList();

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select
ordersumma0_.id as id1_3_0_,
orderdetai1_.id as id1_2_1_,
ordersumma0_.customer_id as customer3_3_0_,
ordersumma0_.order_timestamp as order_ti2_3_0_,
orderdetai1_.amount as amount2_2_1_,
orderdetai1_.product_id as product_3_2_1_,
orderdetai1_.summary_id as summary_4_2_0__,
orderdetai1_.id as id1_2_0__
from
inner join
where
ordersumma0_.id=?
JOIN

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OrderSummary{id=1, orderTimestamp=2017-04-01T10:00}
OrderDetail{id=1, amount=2}

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"SELECT DISTINCT os FROM OrderSummary os" +
" JOIN FETCH os.orderDetailList" +
, OrderSummary.class)
.getResultList();

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select distinct
orderdetai1_.id as id1_2_0__
from
inner join
where
ordersumma0_.id=?
distinct  
SQL

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// order_summary order_detail product JOIN
OrderSummary orderSummary = em.createQuery(
" JOIN FETCH os.orderDetailList od" +
" JOIN FETCH od.product p" +
" WHERE os.id = :id", OrderSummary.class)
.setParameter("id", 1)
.getSingleResult();
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select
product2_.id as id1_4_2_,
orderdetai1_.id as id1_2_0__,
product2_.category_id as category4_4_2_,
product2_.name as name2_4_2_,
product2_.price as price3_4_2_,
product2_.vendor_id as vendor_i5_4_2_
from
inner join
inner join
product product2_
on orderdetai1_.product_id=product2_.id
where
ordersumma0_.id=?
3  
JOIN

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https://www.casareal.co.jp/recruit/jobs/
ls_teacher.php

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https://www.casareal.co.jp/ls/service/shinjinseminar/course01

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Query query = em.createNativeQuery(
"select id, name, price, vendor_id"
+ " from product where id = :id", Product.class);
Product product = (Product) query.getSingleResult();

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"select id, name from product where id = :id");
// 0 id 1 name
Object[] objs = (Object[]) query.getSingleResult();
Integer productId = (Integer) objs[0];
String productName = (String) objs[1];

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@Entity
@SqlResultSetMapping(
name = "product_id_name", //
classes = {
@ConstructorResult(targetClass = ProductDto.class,
columns = {
@ColumnResult(name = "id"),
@ColumnResult(name = "name")
}
)
}
)
public class Product { … }
 
※@SqlResultSetMappings @SqlResultSetMapping

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"select id, name from product where id = :id",
"product_id_name"); // @SqlResultSetMapping name
ProductDto productDto =
(ProductDto) query.getSingleResult();
public class ProductDto {
private Integer id;
private String name;
public ProductDto(Integer id, String name) { … }
}

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// H2 Database LEFT
"SELECT p FROM Product p"
+ " WHERE FUNCTION('LEFT', p.name, 2) = ' '",
Product.class);
List<Product> productList = query.getResultList();

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StoredProcedureQuery query =
em.createStoredProcedureQuery(" ",
.class);
query.setParameter(" ", );
List< > list =
(List< >) query.getResultList();
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@Entity
@Index(members = {"name"})
…
}
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※@Indices @Index

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public interface ProductRepository
extends JpaRepository<Product, Integer> {
// OK
}
※@Repository

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@Service
public class ProductService {
private final ProductRepository repo;

@Autowired // DI
public ProductService(ProductRepository repo) {
this.repo = repo;
}

@Transactional
public void insert(Product product) {
repo.save(product);
}
}
※@Autowired Spring 4.3  
1

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@Query("SELECT p FROM Product p JOIN FETCH p.vendor"
+ " WHERE p.id = :id")
Product findByIdJoinFetch(@Param("id") Integer id);
}

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@Modifying
@Query("UPDATE Product p SET p.name = :name"
void updateName(@Param("name") String name,
@Param("id") Integer id);
}

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@Lock(LockModeType.PESSIMISTIC_READ)
}
※  
https://www.slideshare.net/masatoshitada7/jpa20140518-ccc-r15-jjug-ccc

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@EntityGraph(" ")
}
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https://blog.ik.am/entries/350

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// name
List<Product> findByNameContaining(String keyword);
}

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select
product0_.id as id1_4_,
product0_.category_id as category4_4_,
product0_.name as name2_4_,
product0_.price as price3_4_,
product0_.vendor_id as vendor_i5_4_
from
product product0_
where
product0_.name like ?
binding parameter [1] as [VARCHAR] - [% %]

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@Entity public class Hoge {
@CreatedBy String createdUser;
@CreatedDate LocalDateTime createdDate;
@LastModifiedBy String modifiedUser;
@LastModifiedDate LocalDateTime lastModifiedDate;
}

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@SpringBootApplication
@EnableJpaAuditing(auditorAwareRef = "myAuditorAware")
public class SpringDataJpaDaitokaiApplication { … }
@Component
public class MyAuditorAware
implements AuditorAware<String> {
@Override
public Optional<String> getCurrentAuditor() {
return Optional.of("user01");}
}
Spring Security  
OK

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<entity-mappings>
<persistence-unit-metadata>
<persistence-unit-defaults>
<entity-listeners>
<entity-listener
class="org.springframework.data.jpa.domain.support.AuditingEntityListene
r" />
</entity-listeners>
</persistence-unit-defaults>
</persistence-unit-metadata>
</entity-mappings>
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http://docs.spring.io/spring-boot/docs/1.5.4.RELEASE/reference/htmlsingle/#boot-features-jpa-in-
web-environment

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spring.jpa.open-in-view=false

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@Entity public class Hoge {
// Spring Boot @Column
@Column(name=“foo_bar”) String fooBar;
}
http://docs.spring.io/spring-boot/docs/1.5.4.RELEASE/reference/htmlsingle/#howto-conﬁgure-
hibernate-naming-strategy

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spring.jpa.hibernate.naming.physical-strategy=Strategy FQCN
spring.jpa.hibernate.naming.implicit-strategy=Strategy FQCN

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@SpringBootApplication
@EntityScan(basePackages = {
"com.example.demo.persistence.entity",
"org.springframework.data.jpa.convert.threeten"})
public class SpringDataJpaDaitokaiApplication { … }
http://docs.spring.io/spring-boot/docs/1.5.4.RELEASE/reference/htmlsingle/#howto-separate-entity-
deﬁnitions-from-spring-conﬁguration

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Spring Data JPAによるデータアクセス徹底入門 #jsug

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