基于注解的SpringMVC整合JPA(一)

实体类
Department

package com.sj.bean;

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="department",catalog="sj")
public class Department {

private int id;
private String name;
private Set sets;
@Id
@Column(name="id")
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToMany(mappedBy="department",cascade=CascadeType.ALL)
public Set getSets() {
return sets;
}
public void setSets(Set sets) {
this.sets = sets;
}

}
Employee
package com.sj.bean;

import java.io.Serializable;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@SuppressWarnings("serial")
@Entity
@Table(name="employee",catalog="sj")
public class Employee implements Serializable{

private int id;
private String name;
private Department department;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="deptid")
public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}

}
BaseDAO
package com.sj.dao;

import java.util.List;

public interface BaseDAO {

List listAll();
Object findById(Class c,int id);
boolean save(Object object);
boolean update(Object object);
boolean delete(Object object);

}
BaseDAOImpl
package com.sj.dao;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import org.springframework.stereotype.Component;

@Component("baseDAO")
public class BaseDAOImpl implements BaseDAO {

@PersistenceContext(unitName="sjPU")
private EntityManager entityManager;


public boolean delete(Object object) {
try {
entityManager.remove(object);
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

public Object findById(Class c,int id) {
try {
return entityManager.find(c, id);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

public boolean save(Object object) {
try {
entityManager.persist(object