Simple code using Java that uses Naive Query Retrieval
Solution:
package com.howtodoinjava.jpa.demo.entity; import java.io.Serializable; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.ManyToOne; import javax.persistence.NamedNativeQueries; import javax.persistence.NamedNativeQuery; import javax.persistence.Table;
@Entity(name="EmployeeEntity") @Table (name="employee") @NamedNativeQueries({ @NamedNativeQuery( name = "getAllEmployees", query = "SELECT id, firstName, lastName, email, department.id, department.name " + "FROM employee, department", resultClass=EmployeeEntity.class ), @NamedNativeQuery( name = "getAllEmployeesByDeptId", query = "SELECT id, firstName, lastName, email, department.id, department.name " + "FROM employee, department " + "WHERE department.id = ?", resultClass=EmployeeEntity.class ) }) public class EmployeeEntity implements Serializable { private static final long serialVersionUID = 1L;
@Id @GeneratedValue private Integer id;
private String firstName; private String lastName; private String email;
@ManyToOne private DepartmentEntity department;
public EmployeeEntity() {}
public EmployeeEntity(String name, DepartmentEntity department) { this.firstName = name; this.department = department; }
public EmployeeEntity(String name) { this.firstName = name; }
//Setters and Getters @Override public String toString() { return "EmployeeVO [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + ", department=" + department + "]"; } } |
package com.howtodoinjava.jpa.demo.entity; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToMany; import javax.persistence.Table; @Entity(name="DepartmentEntity") @Table (name="department") public class DepartmentEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id @GeneratedValue private Integer id; private String name;
public DepartmentEntity(){ }
public DepartmentEntity(String name) { super(); this.name = name; }
@OneToMany(mappedBy="department",cascade=CascadeType.PERSIST) private List<EmployeeEntity> employees = new ArrayList<EmployeeEntity>();
//Setters and Getters
@Override public String toString() { return "DepartmentVO [id=" + id + ", name=" + name + "]"; } } |
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