Oracle Enterprise Pack for Eclip…

CREATE TABLE  "DEPARTMENTS"         ("DEPARTMENT_ID" NUMBER(4,0),          "DEPARTMENT_NAME" VARCHAR2(30) CONSTRAINT  "DEPT_NAME_NN" NOT NULL ENABLE,          "MANAGER_ID" NUMBER(6,0),          "LOCATION_ID" NUMBER(4,0),           CONSTRAINT "DEPT_ID_PK" PRIMARY KEY  ("DEPARTMENT_ID") ENABLE,           CONSTRAINT "DEPT_LOC_FK" FOREIGN KEY ("LOCATION_ID")           REFERENCES  "LOCATIONS"  ("LOCATION_ID") ENABLE,           CONSTRAINT "DEPT_MGR_FK" FOREIGN KEY ("MANAGER_ID")           REFERENCES  "EMPLOYEES"  ("EMPLOYEE_ID") ENABLE        )
CREATE TABLE  "EMPLOYEES"         ("EMPLOYEE_ID" NUMBER(6,0),          "FIRST_NAME" VARCHAR2(20),          "LAST_NAME" VARCHAR2(25) CONSTRAINT  "EMP_LAST_NAME_NN" NOT NULL ENABLE,          "EMAIL" VARCHAR2(25) CONSTRAINT "EMP_EMAIL_NN" NOT  NULL ENABLE,          "PHONE_NUMBER" VARCHAR2(20),          "HIRE_DATE" DATE CONSTRAINT "EMP_HIRE_DATE_NN" NOT  NULL ENABLE,          "JOB_ID" VARCHAR2(10) CONSTRAINT "EMP_JOB_NN" NOT  NULL ENABLE,          "SALARY" NUMBER(8,2),          "COMMISSION_PCT" NUMBER(2,2),          "MANAGER_ID" NUMBER(6,0),          "DEPARTMENT_ID" NUMBER(4,0),           CONSTRAINT "EMP_SALARY_MIN" CHECK (salary > 0) ENABLE,           CONSTRAINT "EMP_EMAIL_UK" UNIQUE ("EMAIL") ENABLE,           CONSTRAINT "EMP_EMP_ID_PK" PRIMARY KEY  ("EMPLOYEE_ID") ENABLE,           CONSTRAINT "EMP_DEPT_FK" FOREIGN KEY  ("DEPARTMENT_ID")           REFERENCES   "DEPARTMENTS" ("DEPARTMENT_ID") ENABLE,           CONSTRAINT "EMP_JOB_FK" FOREIGN KEY ("JOB_ID")           REFERENCES  "JOBS"  ("JOB_ID") ENABLE,           CONSTRAINT "EMP_MANAGER_FK" FOREIGN KEY  ("MANAGER_ID")           REFERENCES  "EMPLOYEES"  ("EMPLOYEE_ID") ENABLE        )

package hr.model;    import java.io.Serializable;    import javax.persistence.*;
@Entity()    @Table(name="DEPARTMENTS")    public class Department  implements Serializable {         private static final long serialVersionUID = 1L;
@Id()         @Column(name="DEPARTMENT_ID")         private long departmentId;
@Column(name="DEPARTMENT_NAME")         private String departmentName;
@Column(name="LOCATION_ID")         private java.math.BigDecimal locationId;
//uni-directional many-to-one association to Employee         @ManyToOne(fetch=FetchType.EAGER)         @JoinColumn(name="MANAGER_ID",  referencedColumnName="EMPLOYEE_ID")         private Employee manager;
//bi-directional many-to-one association to Employee         @OneToMany(mappedBy="department", fetch=FetchType.EAGER)         private java.util.Set<Employee> employees;
public Department() {         }              public long getDepartmentId() {             return this.departmentId;         }
public void setDepartmentId(long departmentId) {             this.departmentId = departmentId;         }
...
public Employee getManager() {             return this.manager;         }
public void setManager(Employee manager) {             this.manager = manager;         }                 public java.util.Set<Employee> getEmployees() {             return this.employees;         }
public void setEmployees(java.util.Set<Employee> employees) {             this.employees = employees;         }            }

package hr.model;    import java.io.Serializable;    import javax.persistence.*;
@Entity()    @Table(name="EMPLOYEES")    public class Employee  implements Serializable {         private static final long serialVersionUID = 1L;
@Id()         @Column(name="EMPLOYEE_ID")         private long employeeId;
@Column(name="FIRST_NAME")         private String firstName;
@Column(name="LAST_NAME")         private String lastName;
private String email;
@Column(name="PHONE_NUMBER")         private String phoneNumber;
@Column(name="HIRE_DATE")         private java.sql.Date hireDate;
@Column(name="JOB_ID")         private String jobId;
private java.math.BigDecimal salary;
@Column(name="COMMISSION_PCT")         private java.math.BigDecimal commissionPct;
//bi-directional many-to-one association to Department         @ManyToOne(fetch=FetchType.EAGER)         @JoinColumn(name="DEPARTMENT_ID",  referencedColumnName="DEPARTMENT_ID")         private Department department;
public Employee() {         }
public long getEmployeeId() {             return this.employeeId;         }
public void setEmployeeId(long employeeId) {             this.employeeId = employeeId;         }
...
public Department getDepartment() {             return this.department;         }
public void setDepartment(Department department) {             this.department = department;         }            }

CREATE TABLE  "JOBS"       ("JOB_ID" VARCHAR2(10),        "JOB_TITLE" VARCHAR2(35) CONSTRAINT "JOB_TITLE_NN"  NOT NULL ENABLE,        "MIN_SALARY" NUMBER(6,0),        "MAX_SALARY" NUMBER(6,0),         CONSTRAINT "JOB_ID_PK" PRIMARY KEY ("JOB_ID") ENABLE      )

package  hr.model;    import  java.io.Serializable;    import  java.math.BigDecimal;
public  class Job implements Serializable {        private static final long serialVersionUID  = 1L;        private String jobId;        private String jobTitle;        private BigDecimal minSalary;        private BigDecimal maxSalary;
public Job() {            super();        }
public String getJobId() {            return this.jobId;        }
public void setJobId(String jobId) {            this.jobId = jobId;        }
public String getJobTitle() {            return this.jobTitle;        }
public void setJobTitle(String jobTitle) {            this.jobTitle = jobTitle;        }
public BigDecimal getMinSalary() {            return this.minSalary;        }
public void setMinSalary(BigDecimal  minSalary) {            this.minSalary = minSalary;        }
public BigDecimal getMaxSalary() {            return this.maxSalary;        }
public void setMaxSalary(BigDecimal  maxSalary) {            this.maxSalary = maxSalary;        }
}

@Entity()    @Table(name="JOBS",  schema="HR")    public  class Job implements Serializable {        private static final long serialVersionUID  = 1L;
@Id()        @Column(name="JOB_ID",  unique=true, nullable=false, length=10)        private String jobId;
@Basic()        @Column(name="JOB_TITLE",  nullable=false, length=35)        private String jobTitle;
@Basic()        @Column(name="MIN_SALARY",  precision=10)        private BigDecimal minSalary;
@Basic()        @Column(name="MAX_SALARY",  precision=10)        private BigDecimal maxSalary;
...    }

public  class Employee  implements Serializable  {        ...        private Job job;        ...        public Job getJob() {            return this.job;        }
public void setJob(Job job) {            this.job = job;        }        ...    }

<?xml  version="1.0" encoding="UTF-8"?>    <persistence  version="1.0"  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  ...">        <persistence-unit  name="HRModel">            <jta-data-source>hr</jta-data-source>            <class>hr.model.Department</class>            <class>hr.model.Employee</class>            <class>hr.model.Job</class>        </persistence-unit>    </persistence>

public Employee findEmployee(Integer empId);

@PersistenceContext  private  EntityManager em;

return  em.find(Employee.class, empId);

package  hr.ejb;  import  hr.model.Employee;
import  javax.ejb.Stateless;    import  javax.persistence.EntityManager;    import  javax.persistence.PersistenceContext;
@Stateless    public  class HRBean implements HRBeanLocal {
@PersistenceContext        private EntityManager em;
public HRBean() {            // TODO Auto-generated constructor  stub        }
@Override        public Employee findEmployee(Integer  empId) {            return em.find(Employee.class, empId);        }
}

@EJB(name="HRBean")  private  HRBeanLocal hrBean;

protected  void doGet(            HttpServletRequest request,  HttpServletResponse response)             throws ServletException, IOException {        response.setContentType("text/plain");        int empId = 100;        String empParam =  request.getParameter("emp");        if (empParam != null)            empId = Integer.parseInt(empParam);        PrintWriter out = response.getWriter();        Employee emp = hrBean.findEmployee(empId);        out.println("" + empId + ":  "             + emp.getFirstName() + " " +  emp.getLastName());        out.println("working in " +  emp.getDepartment().getDepartmentName()             + " department");        out.println("as " + emp.getJob().getJobTitle());        out.println("has " +  (emp.getDepartment().getEmployees().size()-1)             + " colleagues");    }