单表操作：
@Repository
public class DepartmentDao {
private static Map<Integer, Department> departments = null;
private static Integer initId = 5;
static {
departments = new HashMap<Integer, Department>();
departments.put(1, new Department(1, "行政部"));
departments.put(2, new Department(2, "财务部"));
departments.put(3, new Department(3, "运营部"));
departments.put(4, new Department(4, "开发部"));
}
public void addDepartment(Department department) {
department.setId(initId);
departments.put(initId, department);
initId++;
}
public Collection<Department> getDepartments() {
return departments.values();
}
public Department getDepartment(Integer id) {
return departments.get(id);
}
public void delDepartment(Integer id) {
departments.remove(id);
}
}
关联表操作：
@Repository
public class EmployeeDao {
private static Map<Integer, Employee> employees = null;
@Autowired
private DepartmentDao departmentDao;
static {
employees = new HashMap<Integer, Employee>();
employees.put(1, new Employee(1, "张三", 3));
employees.put(2, new Employee(2, "李四", 1));
employees.put(3, new Employee(3, "王五", 4));
employees.put(4, new Employee(4, "赵六", 2));
}
private static Integer initId = 5;
public void addEmployee(Employee employee) {
employee.setId(initId);
employees.put(initId, employee);
initId++;
}
public Collection<Employee> getEmployees() {
return employees.values();
}
public Employee getEmployee(Integer id) {
Employee employee = employees.get(id);
Integer departmentId = employee.getDepartmentId();
Department department = departmentDao.getDepartment(departmentId);
employee.setDepartment(department);
return employee;
}
public void delEmployee(Integer id) {
employees.remove(id);
}
}
原文：https://www.cnblogs.com/danhuang/p/12821701.html
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