@Data相当于类中有get与set方法
@NoArgsConstructor:相当于类中有无参构造器
@AllArgsConstructor:相当于类中有有参构造器
@Repository:使用@Repository注解可以确保DAO或者repositories提供异常转译,这个注解修饰的DAO或者repositories类会被ComponetScan发现并配置,同时也不需要为它们提供XML配置项。
@Autowired:自动导入依赖bean
1:Department表@Data @NoArgsConstructor public class Department { private Integer id; private String departmentName; public Department(Integer id,String departmentName){ this.id=id; this.departmentName=departmentName; } }2:Employee表
@Data @AllArgsConstructor @NoArgsConstructor//无参 public class Employee { private Integer id; private String lastName; private String email; private int sex;//0表示女,1表示男 private Department department; private Date birth; public Employee(Integer id, String lastName, String email, int sex, Department department) { this.id = id; this.lastName = lastName; this.email = email; this.sex = sex; this.department = department; this.birth = new Date(); } }3:EmployeeDao
Collection类
//员工Dao @Repository public class EmployeeDao { private static Map4:DepartmentDaoemployees=null; @Autowired private DepartmentDao departmentDao; static{ employees=new HashMap (); employees.put(1001,new Employee (1001,"sheepbotany","[email protected]",0,new Department(101,"教学部"))); employees.put(1002,new Employee (1002,"sheep","[email protected]",0,new Department(102,"市场部"))); employees.put(1003,new Employee (1003,"botany","[email protected]",0,new Department(103,"教研部"))); employees.put(1004,new Employee (1004,"wood","[email protected]",1,new Department(104,"运营部"))); employees.put(1005,new Employee (1005,"woodwhale","[email protected]",1,new Department(105,"后勤部"))); } //主键自增 private static Integer initId=1006; //增加一个员工 public void save(Employee employee){ if(employee.getId()==null){ employee.setId(initId++); } employee.setDepartment(departmentDao.getDepartmentById(employee.getDepartment().getId())); employees.put(employee.getId(),employee); } //查询所有的员工信息 public Collection getAll() { return employees.values(); } //通过id查询员工 public Employee getElementById(Integer id) { return employees.get(id); } //删除员工 public void delete(Integer id){ employees.remove(id); } }
@Repository public class DepartmentDao { //模拟数据库中的数据 private static Mapdepartments=null; static{ //创建一个部门表 departments=new HashMap (); departments.put(101,new Department(101,"教学部")); departments.put(102,new Department(102,"市场部")); departments.put(103,new Department(103,"教研部")); departments.put(104,new Department(104,"运营部")); departments.put(105,new Department(105,"后勤部")); } //获得所有部门信息 public Collection getDepartments() { return departments.values(); } //通过id得到部门 public Department getDepartmentById(Integer id){ return departments.get(id); } }
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