JPA级连删除
import java.util.Date;import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.OneToOne;import javax.persistence.Table;import javax.persistence.Temporal;import javax.persistence.TemporalType;/** * 员工实体类 * @author Administrator * */@Entity@Table(name="employee")public class Employee{@Id@Column(name="emp_id")@GeneratedValue(strategy=GenerationType.IDENTITY) private Integer empId; //员工id@Column(name="emp_name",nullable = false)private String empName; //员工名称@Column(name="emp_officePhone",nullable = false)private String officePhone; //联系电话@Column(name="emp_mobilePhone",nullable = false)private String mobilePhone; //办公电话@Temporal(TemporalType.DATE)@Column(name = "emp_entryDate",nullable = false)private Date entryDate; //入职日期@OneToOne(cascade = CascadeType.ALL)@JoinColumn(name = "addr_id")private Address homeAddress; //员工地址 @ManyToOne(cascade = CascadeType.REFRESH, fetch = FetchType.EAGER, optional = false) @JoinColumn(name="dept_id")private Department department; //员工所在部门public Integer getEmpId() {return empId;}public void setEmpId(Integer empId) {this.empId = empId;}public String getEmpName() {return empName;}public void setEmpName(String empName) {this.empName = empName;}public String getOfficePhone() {return officePhone;}public void setOfficePhone(String officePhone) {this.officePhone = officePhone;}public String getMobilePhone() {return mobilePhone;}public void setMobilePhone(String mobilePhone) {this.mobilePhone = mobilePhone;}public Date getEntryDate() {return entryDate;}public void setEntryDate(Date entryDate) {this.entryDate = entryDate;}public Address getHomeAddress() {return homeAddress;}public void setHomeAddress(Address homeAddress) {this.homeAddress = homeAddress;}public Department getDepartment() {return department;}public void setDepartment(Department department) {this.department = department;}}

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import java.util.HashSet;import java.util.Set;import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.OneToMany;import javax.persistence.OneToOne;import javax.persistence.Table;import org.codehaus.jackson.annotate.JsonIgnore;/** * 部门实体类 * @author Administrator * */@Entity@Table(name="depart")public class Department{@Id@Column(name="dept_id")@GeneratedValue(strategy=GenerationType.IDENTITY)private Integer id;@Column(name="dept_name",nullable = false)private String deptName;  //部门名称@OneToOne(cascade = CascadeType.ALL)@JoinColumn(name = "loca_id")private Location deptLocation;   //部门所在的地址@JsonIgnore@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "department") private Set<Employee> employees = new HashSet<Employee>();public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getDeptName() {return deptName;}public void setDeptName(String deptName) {this.deptName = deptName;}public Location getDeptLocation() {return deptLocation;}public void setDeptLocation(Location deptLocation) {this.deptLocation = deptLocation;}public Set<Employee> getEmployees() {return employees;}public void setEmployees(Set<Employee> employees) {this.employees = employees;}public void addEmployee(Employee employee){employee.setDepartment(this);this.employees.add(employee);}public void deleteEmployee(Employee employee){this.employees.remove(employee);employee.setDepartment(null);}public void clearEmployeeSet(){employees.clear();}}

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@Repository("employeeDAO")public class EmployeeDAO extends BaseDao<Employee>{@Overridepublic void delete(Employee obj) {Employee ori = findByObject(obj);if(null!=ori){ori.getDepartment().deleteEmployee(ori);getEntityManager().remove(ori);return;}else{throw new DaoException("要删除的对象不存在..");}}}

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