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Bael 1908 - Guide to SqlResultSetMapping (#4586)

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* Commit for Eval Article pull request

* Revert "Commit for Eval Article pull request"

* BAEL-1908 Initial Commit
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smokeyrobot 2018-07-08 07:44:42 -04:00 committed by Grzegorz Piwowarek
parent 28166a73de
commit f3237ef2c5
8 changed files with 281 additions and 0 deletions
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32
persistence-modules/java-jpa/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>parent-modules</artifactId>
<groupId>com.baeldung</groupId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>java-jpa</artifactId>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>${h2.version}</version>
</dependency>
</dependencies>
<properties>
<hibernate.version>5.3.1.Final</hibernate.version>
<h2.version>1.4.197</h2.version>
</properties>
</project>

43
persistence-modules/java-jpa/src/main/java/com/baeldung/sqlresultsetmapping/Employee.java Normal file
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package com.baeldung.sqlresultsetmapping;
import javax.persistence.*;
@SqlResultSetMapping(
name="EmployeeResult",
entities={
@EntityResult(
entityClass = com.baeldung.sqlresultsetmapping.Employee.class,
fields={@FieldResult(name="id",column="employeeNumber"),
@FieldResult(name="name", column="name")}
)
}
)
@NamedNativeQuery(
name="Employees",
query="SELECT id as employeeNumber, name FROM EMPLOYEE",
resultSetMapping = "EmployeeResult"
)
@Entity
public class Employee {
@Id
private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

80
persistence-modules/java-jpa/src/main/java/com/baeldung/sqlresultsetmapping/ScheduledDay.java Normal file
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package com.baeldung.sqlresultsetmapping;
import javax.persistence.*;
@SqlResultSetMappings(value = {
@SqlResultSetMapping(name = "ScheduleResult",
classes = { @ConstructorResult(targetClass = com.baeldung.sqlresultsetmapping.ScheduledDay.class,
columns = { @ColumnResult(name = "id", type = Long.class),
@ColumnResult(name = "employeeId", type = Long.class),
@ColumnResult(name = "hourIn"),
@ColumnResult(name = "hourOut"),
@ColumnResult(name = "dayOfWeek") }) }),
@SqlResultSetMapping(name = "FridayEmployeeResult",
columns = { @ColumnResult(name = "employeeId") }),
@SqlResultSetMapping(name = "EmployeeScheduleResults",
entities = { @EntityResult(entityClass = com.baeldung.sqlresultsetmapping.Employee.class),
@EntityResult(entityClass = com.baeldung.sqlresultsetmapping.ScheduledDay.class)
}) })
@NamedNativeQuery(name = "FridayEmployees",
query = "SELECT employeeId FROM schedule_days WHERE dayOfWeek = 'FRIDAY'",
resultSetMapping = "FridayEmployeeResult")
@NamedNativeQuery(name = "Schedules",
query = "SELECT * FROM schedule_days WHERE hourIn = 8",
resultSetMapping = "ScheduleResult")
@Entity
@Table(name = "SCHEDULE_DAYS")
public class ScheduledDay {
@Id
@GeneratedValue
private Long id;
private Long employeeId;
private Integer hourIn;
private Integer hourOut;
private String dayOfWeek;
public ScheduledDay() {
}
public ScheduledDay(Long id, Long employeeId, Integer hourIn, Integer hourOut, String dayofWeek) {
this.id = id;
this.employeeId = employeeId;
this.hourIn = hourIn;
this.hourOut = hourOut;
this.dayOfWeek = dayofWeek;
}
public Long getEmployeeId() {
return employeeId;
}
public void setEmployeeId(Long employeeId) {
this.employeeId = employeeId;
}
public Integer getHourIn() {
return hourIn;
}
public void setHourIn(Integer hourIn) {
this.hourIn = hourIn;
}
public Integer getHourOut() {
return hourOut;
}
public void setHourOut(Integer hourOut) {
this.hourOut = hourOut;
}
public String getDayOfWeek() {
return dayOfWeek;
}
public void setDayOfWeek(String dayOfWeek) {
this.dayOfWeek = dayOfWeek;
}
}

23
persistence-modules/java-jpa/src/main/resources/META-INF/persistence.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="java-jpa-scheduled-day">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>com.baeldung.sqlresultsetmapping.ScheduledDay</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:h2:mem:test;INIT=RUNSCRIPT FROM 'classpath:database.sql'" />
<property name="javax.persistence.jdbc.user" value="sa" />
<property name="javax.persistence.jdbc.password" value="" />
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />
<!--<property name="hibernate.hbm2ddl.auto" value="create-drop" />-->
<property name="show_sql" value="true"/>
<property name="hibernate.temp.use_jdbc_metadata_defaults" value="false"/>
</properties>
</persistence-unit>
</persistence>

19
persistence-modules/java-jpa/src/main/resources/database.sql Normal file
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CREATE TABLE EMPLOYEE
(id BIGINT,
name VARCHAR(10));
INSERT INTO EMPLOYEE VALUES (1, 'JOHN');
INSERT INTO EMPLOYEE VALUES (2, 'MARY');
INSERT INTO EMPLOYEE VALUES (3, 'FRANK');
CREATE TABLE SCHEDULE_DAYS
(id IDENTITY,
employeeId BIGINT,
hourIn int,
hourOut int,
dayOfWeek VARCHAR(10));
INSERT INTO SCHEDULE_DAYS (employeeId, hourIn, hourOut, dayOfWeek) VALUES (1, 13, 21, 'FRIDAY');
INSERT INTO SCHEDULE_DAYS (employeeId, hourIn, hourOut, dayOfWeek) VALUES (2, 8, 4, 'SATURDAY');
INSERT INTO SCHEDULE_DAYS (employeeId, hourIn, hourOut, dayOfWeek) VALUES (3, 8, 4, 'MONDAY');
INSERT INTO SCHEDULE_DAYS (employeeId, hourIn, hourOut, dayOfWeek) VALUES (3, 8, 4, 'FRIDAY');

71
persistence-modules/java-jpa/src/test/java/com/baeldung/sqlresultsetmapping/SqlResultSetMappingUnitTest.java Normal file
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package com.baeldung.sqlresultsetmapping;
import static org.junit.Assert.*;
import org.junit.jupiter.api.*;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
import java.util.Collections;
import java.util.List;
public class SqlResultSetMappingUnitTest {
private static EntityManager em;
private static EntityManagerFactory emFactory;
@BeforeAll
public static void setup() {
emFactory = Persistence.createEntityManagerFactory("java-jpa-scheduled-day");
em = emFactory.createEntityManager();
}
@Test
public void whenNamedQuery_thenColumnResult() {
List<Long> employeeIds = em.createNamedQuery("FridayEmployees").getResultList();
assertEquals(2, employeeIds.size());
}
@Test
public void whenNamedQuery_thenConstructorResult() {
List<ScheduledDay> scheduleDays = Collections.checkedList(em.createNamedQuery("Schedules", ScheduledDay.class).getResultList(), ScheduledDay.class);
assertEquals(3, scheduleDays.size());
assertTrue(scheduleDays.stream().allMatch(c -> c.getHourIn().longValue() == 8));
}
@Test
public void whenNamedQuery_thenSingleEntityResult() {
List<Employee> employees = Collections.checkedList(em.createNamedQuery("Employees").getResultList(), Employee.class);
assertEquals(3, employees.size());
assertTrue(employees.stream().allMatch(c -> c.getClass() == Employee.class));
}
@Test
public void whenNamedQuery_thenMultipleEntityResult() {
final Query query = em.createNativeQuery("SELECT e.id, e.name, d.id, d.employeeId, "
+ " d.dayOfWeek, d.hourIn, d.hourOut "
+ " FROM employee e, schedule_days d "
+ " WHERE e.id = d.employeeId", "EmployeeScheduleResults");
List<Object[]> results = query.getResultList();
assertEquals(4, results.size());
assertTrue(results.get(0).length == 2);
Employee emp = (Employee) results.get(1)[0];
ScheduledDay day = (ScheduledDay) results.get(1)[1];
assertTrue(day.getEmployeeId() == emp.getId());
}
@AfterAll
public static void destroy() {
if (em != null) {
em.close();
}
if (emFactory != null) {
emFactory.close();
}
}
}

3
persistence-modules/java-jpa/src/test/resources/employees.sql Normal file
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INSERT INTO employee (1, "JOHN");
INSERT INTO employee (2, "MARY");
INSERT INTO employee (3, "FRANK");

10
persistence-modules/java-jpa/src/test/resources/scheduledDays.sql Normal file
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INSERT INTO SCHEDULE_DAYS (1, 13, 21, 'FRIDAY');
INSERT INTO SCHEDULE_DAYS (2, 8, 4, 'SATURDAY');
INSERT INTO SCHEDULE_DAYS (3, 8, 4, 'FRIDAY');
-- private Long id;
-- private Long employeeId;
-- private Time in;
-- private Time out;
-- private DayOfWeek dayOfWeek;