MyBatis Puls统一封装前端传递的分页排序实例
作者:不语
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引言
封装方式是使用mybatis-Plus 中 mapper层传入page类自动完成分页操作的基础上,我们封装一个统一的page类,每次查询只需要前端传入 当前页、分页大小、排序字段(多个逗号隔开)、排序方式(多个逗号隔开,与排序字段对应)
操作
1、在controller层接收page参数
2、在传入mapper层时完成page类的完整构建,包括pageNum、pageSize、排序
样例
page工具类
/** * 分页查询实体类 * */ @Data public class PageQuery implements Serializable { private static final long serialVersionUID = 1L; /** * 分页大小 */ private Integer pageSize; /** * 当前页数 */ private Integer pageNum; /** * 排序列 */ private String orderByColumn; /** * 排序的方向desc或者asc */ private String isAsc; /** * 当前记录起始索引 默认值 */ public static final int DEFAULT_PAGE_NUM = 1; /** * 每页显示记录数 默认值 默认查全部 */ public static final int DEFAULT_PAGE_SIZE = Integer.MAX_VALUE; public <T> Page<T> build() { Integer pageNum = ObjectUtil.defaultIfNull(getPageNum(), DEFAULT_PAGE_NUM); Integer pageSize = ObjectUtil.defaultIfNull(getPageSize(), DEFAULT_PAGE_SIZE); if (pageNum <= 0) { pageNum = DEFAULT_PAGE_NUM; } Page<T> page = new Page<>(pageNum, pageSize); List<OrderItem> orderItems = buildOrderItem(); if (CollUtil.isNotEmpty(orderItems)) { page.addOrder(orderItems); } return page; } /** * 构建排序 * * 支持的用法如下: * {isAsc:"asc",orderByColumn:"id"} order by id asc * {isAsc:"asc",orderByColumn:"id,createTime"} order by id asc,create_time asc * {isAsc:"desc",orderByColumn:"id,createTime"} order by id desc,create_time desc * {isAsc:"asc,desc",orderByColumn:"id,createTime"} order by id asc,create_time desc */ private List<OrderItem> buildOrderItem() { if (StringUtils.isBlank(orderByColumn) || StringUtils.isBlank(isAsc)) { return null; } String orderBy = SqlUtil.escapeOrderBySql(orderByColumn); orderBy = StringUtils.toUnderScoreCase(orderBy); // 兼容前端排序类型 isAsc = StringUtils.replaceEach(isAsc, new String[]{"ascending", "descending"}, new String[]{"asc", "desc"}); //替换其中的 "ascending", "descending" 为 "asc", "desc" String[] orderByArr = orderBy.split(StringUtils.SEPARATOR); // StringUtils.SEPARATOR = "," String[] isAscArr = isAsc.split(StringUtils.SEPARATOR); //前面已经非空判断了 orderByArr isAscArr 长度一定大于0 //isAscArr.length != 1 单个排序方式直接放行 //isAscArr.length != 1 && isAscArr.length != orderByArr.length 单字段单排序保证 字段与排序数量要对应 if (isAscArr.length != 1 && isAscArr.length != orderByArr.length) { throw new ServiceException("排序参数有误"); } List<OrderItem> list = new ArrayList<>(); // 每个字段各自排序 for (int i = 0; i < orderByArr.length; i++) { String orderByStr = orderByArr[i]; String isAscStr = isAscArr.length == 1 ? isAscArr[0] : isAscArr[i]; if ("asc".equals(isAscStr)) { list.add(OrderItem.asc(orderByStr)); } else if ("desc".equals(isAscStr)) { list.add(OrderItem.desc(orderByStr)); } else { throw new ServiceException("排序参数有误"); } } return list; } }
controller层
/** * 查询测试单表列表 */ @SaCheckPermission("demo:demo:list") @GetMapping("/list") public TableDataInfo<TestDemoVo> list(TestDemoBo bo, PageQuery pageQuery) { return iTestDemoService.queryPageList(bo, pageQuery); }
serviceImpl 实现
/** * 自定义分页查询 */ @Override public TableDataInfo<TestDemoVo> customPageList(TestDemoBo bo, PageQuery pageQuery) { LambdaQueryWrapper<TestDemo> lqw = buildQueryWrapper(bo); Page<TestDemoVo> result = baseMapper.customPageList(pageQuery.build(), lqw); return TableDataInfo.build(result); } private LambdaQueryWrapper<TestDemo> buildQueryWrapper(TestDemoBo bo) { Map<String, Object> params = bo.getParams(); LambdaQueryWrapper<TestDemo> lqw = Wrappers.lambdaQuery(); lqw.like(StringUtils.isNotBlank(bo.getTestKey()), TestDemo::getTestKey, bo.getTestKey()); lqw.eq(StringUtils.isNotBlank(bo.getValue()), TestDemo::getValue, bo.getValue()); lqw.between(params.get("beginCreateTime") != null && params.get("endCreateTime") != null, TestDemo::getCreateTime, params.get("beginCreateTime"), params.get("endCreateTime")); return lqw; }
mapper层
Page<TestDemoVo> customPageList(@Param("page") Page<TestDemo> page, @Param("ew") Wrapper<TestDemo> wrapper);
xml
<select id="customPageList" resultType="com.ruoyi.demo.domain.vo.TestDemoVo"> SELECT * FROM test_demo ${ew.customSqlSegment} </select>
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