Hasor【环境搭建 02】Dataway接口配置服务使用DataQL聚合查询引擎（Mybatis执行器实现分页查询举例说明+问题分析）

// SQL 执行器切换为分页模式及首页页面设置
hint FRAGMENT_SQL_QUERY_BY_PAGE = true
hint FRAGMENT_SQL_QUERY_BY_PAGE_NUMBER_OFFSET = 1
hint FRAGMENT_SQL_PAGE_DIALECT = "postgresql"
// 统一转驼峰
// 问题及说明2：通过下边的查询SQL测试得出结论，转驼峰的规则是，全部字母小写下划线后的字母大写，特别要注意的是【这里的驼峰只针对数据查询的字段，分页字段默认是驼峰的，下面附上测试】。
// default、upper、lower、hump
hint FRAGMENT_SQL_COLUMN_CASE = "hump" 
// 定义查询SQL
// 问题及说明3：对mybatis的支持并不完善，支持的标签有<select> <insert> <delete> <update> <if> 和<foreach>相关，<where>标签测试是不支持的。
// 问题及说明4：Date类型数据的查询，需要使用 TO_CHAR 函数，否则是毫秒值。
var dataSetFun = @@mybatis(keyword,futurestartdate) <%
    <select>
        SELECT
          firstrecommendfield AS first_recommend_field,
          secondrecommendfield AS second_REcommend_Field,
            TO_CHAR(futurestartdate, 'yyyy-MM-dd') AS future_start_date
        FROM
          yz_test_match
        WHERE futurestartdate is not null
        <if test="keyword != null and keyword != ''">
           AND firstrecommendfield like concat('%','${keyword}','%') 
        </if>    
        <if test="futurestartdate != null and futurestartdate != ''">
           AND futurestartdate = '${futurestartdate}'
        </if>  
        ORDER BY futurestartdate
    </select>
%>
// 创建分页查询对象
// 问题及说明5：参数的传递规则，顺序很重要，从左到右是SQL内的参数顺序。
var pageQuery =  dataSetFun(${keyword},${futurestartdate},${pageSize},${pageNumber});
// 设置分页信息
run pageQuery.setPageInfo({
    "pageSize"    : #{pageSize}, 
    "currentPage" : #{pageNumber}
});
// 执行分页查询
var pageData = pageQuery.data();
// 查询分页信息
var pageInfo = pageQuery.pageInfo();
// 返回结果封装
// 问题及说明6：结果会封装到之前的value内。
return {
  "pageData" : pageData,
  "pageInfo" : pageInfo
};

{
  "keyword": "",
  "futurestartdate": "2021-04-18",
  "pageSize": 1,
  "pageNumber": 1
}

{
  "success": true,
  "message": "OK",
  "location": null,
  "code": 0,
  "lifeCycleTime": 220,
  "executionTime": 214,
  "value": {
    "pageData": [
      {
        "firstRecommendField": "豫A5VT98",
        "secondRecommendField": "460020603684395",
        "futureStartDate": "2021-04-18"
      }
    ],
    "pageInfo": {
      "enable": true,
      "pageSize": 1,
      "totalCount": 5175,
      "totalPage": 5175,
      "currentPage": 1,
      "recordPosition": 0
    }
  }
}

hint FRAGMENT_SQL_COLUMN_CASE = "upper"

{
  "success": true,
  "message": "OK",
  "location": null,
  "code": 0,
  "lifeCycleTime": 206,
  "executionTime": 199,
  "value": {
    "pageData": {
      "FIRST_RECOMMEND_FIELD": "豫A5VT98",
      "SECOND_RECOMMEND_FIELD": "460020603684395",
      "FUTURE_START_DATE": "2021-04-18"
    },
    "pageInfo": {
      "enable": true,
      "pageSize": 1,
      "totalCount": 5175,
      "totalPage": 5175,
      "currentPage": 1,
      "recordPosition": 0
    }
  }
}