NativeQueryで複数のエンティティを同時にSELECTしつつconstructor-resultを使ってみる
TweetPosted on Sunday Jan 26, 2014 at 03:18PM in Technology
NativeQueryでconstructor-resultを使ってSELECTしてみるの続きです。2つのエンティティ分のデータを取得するSELECT文から、エンティティ2つに加えて、DTOクラスのオブジェクト1つをconstructor-resultを使って取得してみます。だからなんだって感じもしますが。
環境
- Hibernate 4.3.0.Final
- WildFly8.0.0.CR1
- Oracle JDK7u51
- postgresql-9.3-1100.jdbc41.jar
- PostgreSQL 9.2.4
何をするか
エンティティと関連の構造は前回と同じです。
今回は以下をSELECT一回で取ってきます
- Employeeエンティティ
- Deptエンティティ
- deptName, firstName, lastNameをフィールドにもつDTO
準備
配置図
図中で選択されている資源を作成または編集します。
- orm.xmlにNamedNativeQuery “findVarious” とResultSetMapping “variousResult” を追加します
- テストクラスVariousResultSelectTestを作ります
- DTOクラスEmployeeProfileを作ります
- テストデータは前回のを流用します
EmployeeProfile.java
package org.arquillian.example;
public class EmployeeProfile {
private String deptName;
private String firstName;
private String lastName;
public EmployeeProfile(String deptName, String firstName, String lastName) {
super();
this.deptName = deptName;
this.firstName = firstName;
this.lastName = lastName;
}
@Override
public String toString() {
return "EmployeeProfile [deptName=" + deptName + ", firstName=" + firstName + ", lastName=" + lastName + "]";
}
}
orm.xml
<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence/orm http://xmlns.jcp.org/xml/ns/persistence/orm_2_1.xsd">
<named-native-query name="findVarious" result-set-mapping="variousResult">
<query><![CDATA[
SELECT
emp.id,
emp.firstName,
emp.lastName,
emp.dept_id,
dep.deptName
FROM
Employee AS emp,
Dept AS dep
WHERE
emp.dept_id = dep.id
]]></query>
</named-native-query>
<sql-result-set-mapping name="variousResult">
<entity-result entity-class="org.arquillian.example.Employee"/>
<entity-result entity-class="org.arquillian.example.Dept">
<field-result name="id" column="dept_id"/>
<field-result name="deptName" column="deptName"/>
</entity-result>
<constructor-result target-class="org.arquillian.example.EmployeeProfile">
<column name="deptName" class="java.lang.String" />
<column name="firstName" class="java.lang.String" />
<column name="lastName" class="java.lang.String" />
</constructor-result>
</sql-result-set-mapping>
</entity-mappings>
VariousResultSelectTest.java
package org.arquillian.example;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.transaction.Transactional;
import org.jboss.arquillian.container.test.api.Deployment;
import org.jboss.arquillian.junit.Arquillian;
import org.jboss.arquillian.persistence.UsingDataSet;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.ShrinkWrap;
import org.jboss.shrinkwrap.api.asset.EmptyAsset;
import org.jboss.shrinkwrap.api.spec.WebArchive;
import org.junit.Test;
import org.junit.runner.RunWith;
@RunWith(Arquillian.class)
public class VariousSelectTest {
@Deployment
public static Archive<?> createDeployment() {
Archive<?> a = ShrinkWrap.create(WebArchive.class, "test.war")
.addPackage(Employee.class.getPackage())
.addAsResource("test-persistence.xml", "META-INF/persistence.xml")
.addAsResource("META-INF/orm.xml", "META-INF/orm.xml")
.addAsWebInfResource(EmptyAsset.INSTANCE, "beans.xml")
.addAsWebInfResource("jbossas-ds.xml");
return a;
}
@PersistenceContext
EntityManager em;
@Test
@Transactional
@UsingDataSet({"datasets/relativeSelect/dept.yml", "datasets/relativeSelect/employees.yml"})
public void select() throws Exception {
dumpEntityList(em.createNamedQuery("findVarious").getResultList());
}
protected void dumpEntityList(List<?> list){
for(Object o : list){
Object[] array = (Object[])o;
Employee employee = (Employee) array[0];
Dept dept = (Dept) array[1];
EmployeeProfile employeeProfile = (EmployeeProfile) array[2];
System.out.println("");
System.out.println("---------------------------------");
System.out.printf("id=%d, firstName=%s, lastName=%s, dept_id=%s, deptName=%s, employee=%s, dept=%s\n",
employee.getId(), employee.getFirstName(), employee.getLastName(),
dept.getId(), dept.getDeptName(),
em.contains(employee), em.contains(dept));
System.out.println(employeeProfile);
System.out.println("---------------------------------");
}
}
}
実行結果
15:15:55,405 INFO [stdout] (pool-2-thread-20) Hibernate: SELECT emp.id, emp.firstName, emp.lastName, emp.dept_id, dep.deptName FROM Employee AS emp, Dept AS dep WHERE emp.dept_id = dep.id 15:15:55,409 INFO [stdout] (pool-2-thread-20) 15:15:55,409 INFO [stdout] (pool-2-thread-20) --------------------------------- 15:15:55,409 INFO [stdout] (pool-2-thread-20) id=-1, firstName=Taro, lastName=Yamada, dept_id=-1, deptName=Sales, employee=true, dept=true 15:15:55,409 INFO [stdout] (pool-2-thread-20) EmployeeProfile [deptName=Sales, firstName=Taro, lastName=Yamada] 15:15:55,410 INFO [stdout] (pool-2-thread-20) --------------------------------- 15:15:55,410 INFO [stdout] (pool-2-thread-20) 15:15:55,410 INFO [stdout] (pool-2-thread-20) --------------------------------- 15:15:55,410 INFO [stdout] (pool-2-thread-20) id=-2, firstName=Jiro, lastName=Suzuki, dept_id=-1, deptName=Sales, employee=true, dept=true 15:15:55,410 INFO [stdout] (pool-2-thread-20) EmployeeProfile [deptName=Sales, firstName=Jiro, lastName=Suzuki] 15:15:55,410 INFO [stdout] (pool-2-thread-20) --------------------------------- 15:15:55,410 INFO [stdout] (pool-2-thread-20) 15:15:55,410 INFO [stdout] (pool-2-thread-20) --------------------------------- 15:15:55,411 INFO [stdout] (pool-2-thread-20) id=-3, firstName=Saburo, lastName=Tanaka, dept_id=-2, deptName=Legal, employee=true, dept=true 15:15:55,411 INFO [stdout] (pool-2-thread-20) EmployeeProfile [deptName=Legal, firstName=Saburo, lastName=Tanaka] 15:15:55,411 INFO [stdout] (pool-2-thread-20) ---------------------------------
あんまり意味ないかもしれませんが柔軟に出来ているなぁと。
備考
今回使ったsql-result-set-mappingに、さらに以下を追加してもXML的には不正ではないのですが、
<column-result name="deptName"/>
動かそうとすると何故か以下のような例外が出て動きません。まああまり困ることもなさそうですが。
15:26:45,836 SEVERE [org.jboss.arquillian.protocol.jmx.JMXTestRunner] (pool-2-thread-21) Failed: org.arquillian.example.VariousSelectTest.select: javax.persistence.PersistenceException: org.hibernate.loader.custom.NonUniqueDiscoveredSqlAliasException: Encountered a duplicated sql alias [deptName] during auto-discovery of a native-sql query
参考文献
Tags: jpa
