SpringBoot模拟一个员工数据库并且实现增删改查
2021/9/19 19:06:49
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1:首先创建一个pojo层在里面定义数据
Department部门:
package com.example.springbootweb.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; /** * @author ${范涛之} * @Description * @create 2021-09-19 10:25 */ @Data @AllArgsConstructor @NoArgsConstructor public class Department { private Integer id; private String department; }
Employee部门:
package com.example.springbootweb.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; /** * @author ${范涛之} * @Description * @create 2021-09-19 10:26 */ @Data @AllArgsConstructor @NoArgsConstructor public class Employee { private Integer id; private String lastname; private String email; private Integer gender; //0代表女 1代表男 private Department department; private Data birth; }
2:编写dao层注入数据:
部门层:
package com.example.springbootweb.dao; import com.example.springbootweb.pojo.Department; import java.util.Collection; import java.util.HashMap; import java.util.Map; /** * @author ${范涛之} * @Description * @create 2021-09-19 10:28 */ //部门dao public class DepartmentDao { //模拟数据库中的数据 private static Map<Integer, Department> department = null; static { department = new HashMap<Integer,Department>(); //创建一个部门表 department.put(101,new Department(101,"教学部")); department.put(102,new Department(101,"教研部")); department.put(103,new Department(101,"市场部")); department.put(104,new Department(101,"运营部")); department.put(105,new Department(101,"清洁部")); } //获得所有部门信息 public Collection<Department> getDepartment(){ return department.values(); } //通过id得到部门 public Department getDepartment(Integer id){ return department.get(id); } }
员工层:
package com.example.springbootweb.dao; import com.example.springbootweb.pojo.Department; import com.example.springbootweb.pojo.Employee; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import java.util.Collection; import java.util.HashMap; import java.util.Map; /** * @author ${范涛之} * @Description * @create 2021-09-19 10:44 */ @Repository public class EmployeeDao { //模拟数据库中的数据 private static Map<Integer, Employee> employees = null; //员工有所属的部门 @Autowired private DepartmentDao departmentDao; static { employees = new HashMap<Integer,Employee>(); employees.put(1001,new Employee(1001,"AA","2831826106@qq.com",1,new Department(101,"教学部"))); employees.put(1002,new Employee(1002,"BB","2831826106@qq.com",1,new Department(101,"教研部"))); employees.put(1003,new Employee(1003,"CC","2831826106@qq.com",1,new Department(101,"市场部"))); employees.put(1004,new Employee(1004,"DD","2831826106@qq.com",1,new Department(101,"运营部"))); employees.put(1005,new Employee(1005,"EE","2831826106@qq.com",1,new Department(101,"清洁部"))); } //主键自增 private static Integer ininID = 1006; // 增加一个员工 public void save(Employee employee){ if (employee.getId()== null){ employee.setId(ininID++); } employee.setDepartment(departmentDao.getDepartmentByid(employee.getDepartment().getId())); employees.put(employee.getId(),employee); } //查询全部员工 public Collection<Employee> getAll(){ return employees.values(); } //通过ID查询员工 public Employee getEmployeeByid(Integer id){ return employees.get(id); } //删除员工拖过ID public void delete(Integer id){ employees.remove(id); } }
部门层
package com.example.springbootweb.dao; import com.example.springbootweb.pojo.Department; import org.springframework.stereotype.Repository; import java.util.Collection; import java.util.HashMap; import java.util.Map; /** * @author ${范涛之} * @Description * @create 2021-09-19 10:28 */ //部门dao @Repository public class DepartmentDao { //模拟数据库中的数据 private static Map<Integer, Department> department = null; static { department = new HashMap<Integer,Department>(); //创建一个部门表 department.put(101,new Department(101,"教学部")); department.put(102,new Department(101,"教研部")); department.put(103,new Department(101,"市场部")); department.put(104,new Department(101,"运营部")); department.put(105,new Department(101,"清洁部")); } //获得所有部门信息 public Collection<Department> getDepartmentByid(){ return department.values(); } //通过id得到部门 public Department getDepartmentByid(Integer id){ return department.get(id); } }
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