分頁和條件查詢接口開發

一、分頁

1、MyBatisPlusConfig中配置分頁插件

/**
 * 分頁插件
 */
@Bean
public PaginationInterceptor paginationInterceptor() {
    return new PaginationInterceptor();
}

2、分頁Controller方法

TeacherAdminController中添加分頁方法

@ApiOperation(value = "分頁講師列表")
@GetMapping("{page}/{limit}")
public R pageList(
    @ApiParam(name = "page", value = "當前頁碼", required = true)
    @PathVariable Long page,
 
    @ApiParam(name = "limit", value = "每頁記錄數", required = true)
    @PathVariable Long limit){
 
    Page<Teacher> pageParam = new Page<>(page, limit);
 
    teacherService.page(pageParam, null);
    List<Teacher> records = pageParam.getRecords();
    long total = pageParam.getTotal();
 
    return  R.ok().data("total", total).data("rows", records);
}

3、Swagger中測試

二、條件查詢

根據 講師名稱name， 講師頭銜level、講師入駐時間gmt_create（時間段）查詢

1、創建查詢對象

創建com.guli.edu.query包，創建TeacherQuery.java查詢對象

 

package com.guli.edu.query;
 
@ApiModel(value = "Teacher查詢對象", description = "講師查詢對象封裝")
@Data
public class TeacherQuery implements Serializable {
 
    private static final long serialVersionUID = 1L;
 
    @ApiModelProperty(value = "教師名稱,模糊查詢")
    private String name;
 
    @ApiModelProperty(value = "頭銜 1高級講師 2首席講師")
    private Integer level;
 
    @ApiModelProperty(value = "查詢開始時間", example = "2019-01-01 10:10:10")
    private String begin;//注意，這里使用的是String類型，前端傳過來的數據無需進行類型轉換
 
    @ApiModelProperty(value = "查詢結束時間", example = "2019-12-01 10:10:10")
    private String end;
}

2、service

接口

package com.guli.edu.service;
public interface TeacherService extends IService<Teacher> {
    void pageQuery(Page<Teacher> pageParam, TeacherQuery teacherQuery);
}

實現

package com.guli.edu.service.impl;
 
@Service
public class TeacherServiceImpl extends ServiceImpl<TeacherMapper, Teacher> implements TeacherService {
 
    @Override
    public void pageQuery(Page<Teacher> pageParam, TeacherQuery teacherQuery) {
 
        QueryWrapper<Teacher> queryWrapper = new QueryWrapper<>();
        queryWrapper.orderByAsc("sort");
 
        if (teacherQuery == null){
            baseMapper.selectPage(pageParam, queryWrapper);
            return;
        }
 
        String name = teacherQuery.getName();
        Integer level = teacherQuery.getLevel();
        String begin = teacherQuery.getBegin();
        String end = teacherQuery.getEnd();
 
        if (!StringUtils.isEmpty(name)) {
            queryWrapper.like("name", name);
        }
 
        if (!StringUtils.isEmpty(level) ) {
            queryWrapper.eq("level", level);
        }
 
        if (!StringUtils.isEmpty(begin)) {
            queryWrapper.ge("gmt_create", begin);
        }
 
        if (!StringUtils.isEmpty(end)) {
            queryWrapper.le("gmt_create", end);
        }
 
        baseMapper.selectPage(pageParam, queryWrapper);
    }
}

3、controller

TeacherAdminController中修改 pageList方法：

增加參數TeacherQuery teacherQuery，非必選

@ApiOperation(value = "分頁講師列表")
@GetMapping("{page}/{limit}")
public R pageQuery(
    @ApiParam(name = "page", value = "當前頁碼", required = true)
    @PathVariable Long page,
 
    @ApiParam(name = "limit", value = "每頁記錄數", required = true)
    @PathVariable Long limit,
 
    @ApiParam(name = "teacherQuery", value = "查詢對象", required = false)
    TeacherQuery teacherQuery){
 
    Page<Teacher> pageParam = new Page<>(page, limit);
 
    teacherService.pageQuery(pageParam, teacherQuery);
    List<Teacher> records = pageParam.getRecords();
    long total = pageParam.getTotal();
 
    return  R.ok().data("total", total).data("rows", records);
}

4、Swagger中測試