苍穹外卖--员工分页查询

请求参数封装：

@Data
public class EmployeePageQueryDTO implements Serializable {

    //员工姓名
    private String name;

    //页码
    private int page;

    //每页显示记录数
    private int pageSize;

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14

请求结果封装：

public class PageResult implements Serializable {

    private long total; //总记录数

    private List records; //当前页数据集合

}

1
2
3
4
5
6
7
8

Controller层

 @GetMapping("/page")
    @ApiOperation("员工分页查询")
    public Result<PageResult> page(EmployeePageQueryDTO employeePageQueryDTO){
        log.info("员工分页查询，参数为：{}", employeePageQueryDTO);
        PageResult pageResult = employeeService.pageQuery(employeePageQueryDTO);//后续定义
        return Result.success(pageResult);
    }

1
2
3
4
5
6
7
8

Service层

public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // select * from employee limit 0,10
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());

        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);//后续定义

        long total = page.getTotal();
        List<Employee> records = page.getResult();

        return new PageResult(total, records);
    }

1
2
3
4
5
6
7
8
9
10
11
12
13

Mapper层

Page<Employee> pageQuery(EmployeePageQueryDTO employeePageQueryDTO);
1

在 src/main/resources/mapper/EmployeeMapper.xml 中编写SQL：

1
2

<select id="pageQuery" resultType="com.sky.entity.Employee">
        select * from employee
        <where>
            <if test="name != null and name != ''">
                and name like concat('%',#{name},'%')
            </if>
        </where>
        order by create_time desc
    </select>

1
2
3
4
5
6
7
8
9
10

代码完善

时间的格式有问题：

在WebMvcConfiguration中扩展SpringMVC的消息转换器，统一对日期类型进行格式处理

protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("扩展消息转换器...");
        //创建一个消息转换器对象
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        //需要为消息转换器设置一个对象转换器，对象转换器可以将Java对象序列化为json数据
        converter.setObjectMapper(new JacksonObjectMapper());
        //将自己的消息转化器加入容器中
        converters.add(0,converter);
    }

1
2
3
4
5
6
7
8
9
10