Using Named Native Query : Native Query « JPA « Java

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Java » JPA » Native Query 




Using Named Native Query



File: Address.java

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Address {
  @Id
  private int id;

  private String street;

  private String city;

  private String state;

  private String zip;

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getStreet() {
    return street;
  }

  public void setStreet(String address) {
    this.street = address;
  }

  public String getCity() {
    return city;
  }

  public void setCity(String city) {
    this.city = city;
  }

  public String getState() {
    return state;
  }

  public void setState(String state) {
    this.state = state;
  }

  public String getZip() {
    return zip;
  }

  public void setZip(String zip) {
    this.zip = zip;
  }

  public String toString() {
    return "Address id: " + getId() ", street: " + getStreet() ", city: " + getCity()
        ", state: " + getState() ", zip: " + getZip();
  }

}


File: Professor.java

import java.util.ArrayList;
import java.util.Collection;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedNativeQuery;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name = "EMP")
@NamedNativeQuery(name = "nativeSQL", query = "SELECT emp1.emp_id, emp1.name, emp1.manager_id, "
    "emp1.dept_id, emp1.address_id " "FROM EMP emp1, EMP emp2 "
    "WHERE ((emp2.EMP_ID = ?) AND (emp2.EMP_ID = emp1.MANAGER_ID))", resultClass = Professor.class)
public class Professor {
  @Id
  @Column(name = "EMP_ID")
  private int id;

  private String name;

  @OneToOne
  private Address address;

  @ManyToOne
  @JoinColumn(name = "DEPT_ID")
  private Department department;

  @ManyToOne
  @JoinColumn(name = "MANAGER_ID")
  private Professor manager;

  @OneToMany(mappedBy = "manager")
  private Collection<Professor> directs = new ArrayList<Professor>();

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Address getAddress() {
    return address;
  }

  public void setAddress(Address address) {
    this.address = address;
  }

  public Department getDepartment() {
    return department;
  }

  public void setDepartment(Department department) {
    this.department = department;
  }

  public Collection<Professor> getDirects() {
    return directs;
  }

  public void addDirect(Professor employee) {
    if (!getDirects().contains(employee)) {
      getDirects().add(employee);
      if (employee.getManager() != null) {
        employee.getManager().getDirects().remove(employee);
      }
      employee.setManager(this);
    }
  }

  public Professor getManager() {
    return manager;
  }

  public void setManager(Professor manager) {
    this.manager = manager;
  }

  public String toString() {
    return "Professor id: " + getId() " name: " + getName() " with MgrId: "
        (getManager() == null null : getManager().getId());
  }
}


File: Department.java

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Department {
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private int id;

  private String name;

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String deptName) {
    this.name = deptName;
  }

  public String toString() {
    return "Department id: " + getId() ", name: " + getName();
  }
}


File: ProfessorService.java

import java.util.List;

import javax.persistence.EntityManager;

public class ProfessorService {
  protected EntityManager em;

  public ProfessorService(EntityManager em) {
    this.em = em;
  }

  public List findProfessorsReportingTo(int managerId) {
    return em.createNamedQuery("nativeSQL").setParameter(1, managerId)
        .getResultList();
  }

}


File: JPAUtil.java

import java.io.Reader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;

public class JPAUtil {
  Statement st;
  
  public JPAUtil() throws Exception{
    Class.forName("org.hsqldb.jdbcDriver");
    System.out.println("Driver Loaded.");
    String url = "jdbc:hsqldb:data/tutorial";

    Connection conn = DriverManager.getConnection(url, "sa""");
    System.out.println("Got Connection.");
    st = conn.createStatement();
  }
  public void executeSQLCommand(String sqlthrows Exception {
    st.executeUpdate(sql);
  }
  public void checkData(String sqlthrows Exception {
    ResultSet rs = st.executeQuery(sql);
    ResultSetMetaData metadata = rs.getMetaData();

    for (int i = 0; i < metadata.getColumnCount(); i++) {
      System.out.print("\t"+ metadata.getColumnLabel(i + 1))
    }
    System.out.println("\n----------------------------------");

    while (rs.next()) {
      for (int i = 0; i < metadata.getColumnCount(); i++) {
        Object value = rs.getObject(i + 1);
        if (value == null) {
          System.out.print("\t       ");
        else {
          System.out.print("\t"+value.toString().trim());
        }
      }
      System.out.println("");
    }
  }
}


File: Main.java

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class Main {
  public static void main(String[] athrows Exception {
    JPAUtil util = new JPAUtil();

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("ProfessorService");
    EntityManager em = emf.createEntityManager();
    ProfessorService service = new ProfessorService(em);

    em.getTransaction().begin();


    service.findProfessorsReportingTo(1);
    
    util.checkData("select * from EMP");

    em.getTransaction().commit();
    em.close();
    emf.close();
  }
}




File: persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence" version="1.0">
  <persistence-unit name="JPAService" transaction-type="RESOURCE_LOCAL">
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
      <property name="hibernate.hbm2ddl.auto" value="update"/>
      <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
      <property name="hibernate.connection.username" value="sa"/>
      <property name="hibernate.connection.password" value=""/>
      <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/>
    </properties>
  </persistence-unit>
</persistence>

           
       














JPA-UsingNamedNativeQuery.zip( 5,336 k)
Related examples in the same category
1.Native Query For Delete
2.Native Insert Statement With Parameter
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