Layui分页查询实践指南

前言

近期在同事的代码中观察到了一种高效的分页查询处理方式，采用Layui配合Mybatis-Plus实现，适用于多表联查场景。这一方法不仅逻辑清晰，还简化了业务层的条件判断逻辑。

Layui分页查询VO对象

分页查询的核心数据类为LayuiData，定义如下：

@Data@AllArgsConstructor@NoArgsConstructorpublic class LayuiData {    private Integer code;    // Request code    private Long count; // Total number    private String msg; // Description    private Object data; //查询结果}

Controller逻辑

/getClientList接口的参数解析和分页处理：

@GetMapping("/getClientList")@ResponseBodypublic LayuiData getAll(    @RequestParam(name = "page", required = true, defaultValue = "1") int num,    @RequestParam(name = "limit", required = true, defaultValue = "10") int size,    String keyWord,    String registerTime) {        IPage
    
     > listPage = clientService.findClientPage(num, size, keyWord, registerTime);    return new LayuiData(listPage.getTotal(), listPage.getRecords());}

Service层逻辑

findClientPage的构建：

IPage
    
     > findClientPage(    Integer num,    Integer size,    String keyWord,    String registerTime) {    QueryWrapper
     
      
       > wrapper = new QueryWrapper<>();    if (StringUtils.isNotEmpty(keyWord)) {        wrapper.like("c.real_name", keyWord)               .or().like("c.phone", keyWord);    }    if (StringUtils.isNotEmpty(registerTime)) {        String stime = registerTime.substring(0, 20);        String etime = registerTime.substring(22, 41);        wrapper.ge("c.register_time", stime)               .le("c.register_time", etime);    }    Page
       
        
         > page = new Page<>(num, size); return clientMapper.findClientPage(page, wrapper);}

Mapper映射逻辑

findClientPage的 Mapper 方法：

IPage
    
     > findClientPage(    @Param(Constants.WRAPPER) QueryWrapper
     
      
       > wrapper) {    return "'" + ew.customSqlSegment + "'";}